TI OPA4171-Q1 Opax171-q1 36-v, single-supply, general-purpose operational amplifier Datasheet

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OPA171-Q1, OPA2171-Q1, OPA4171-Q1
SBOS556B – JUNE 2011 – REVISED DECEMBER 2014
OPAx171-Q1 36-V, Single-Supply, General-Purpose
Operational Amplifier
1 Features
3 Description
•
•
The OPA171-Q1 family of devices is a 36-V, singlesupply, low-noise operational amplifier (op amp) with
the ability to operate on supplies ranging from 2.7 V
(±1.35 V) to 36 V (±18 V). This device is available in
micro-packages and offers low offset, drift, and
bandwidth with low quiescent current. The single,
dual, and quad versions all have identical
specifications for maximum design flexibility.
1
•
•
•
•
•
•
•
•
•
•
•
•
Qualified for Automotive Applications
AEC-Q100 Test Guidance With the Following:
– Device Temperature Grade 1: –40°C to 125°C
Ambient Operating Temperature Range
– Device HBM ESD Classification Level H2
– Device CDM ESD Classification Level C3A
(OPA171-Q1) and C6 (OPA2171-Q1,
OPA4171-Q1)
Supply Range: 2.7 to 36 V, ±1.35 to ±18 V
Low Noise: 14 nV/√Hz
Low Offset Drift: ±0.3 µV/°C (typ)
RFI Filtered Inputs
Input Range Includes the Negative Supply
Input Range Operates to Positive Supply
Rail-to-Rail Output
Gain Bandwidth: 3 MHz
Low Quiescent Current: 475 µA per Amplifier
High Common-Mode Rejection: 120 dB (typ)
Low Input Bias Current: 8 pA
Industry-Standard Package:
– 5-Pin Small-Outline Transistor [SOT (SOT-23)
- DBV] Package
Unlike most op amps, which are specified at only one
supply voltage, the OPAx171-Q1 family of devices is
specified from 2.7 to 36 V. Input signals beyond the
supply rails do not cause phase reversal. The
OPAx171-Q1 family of devices is stable with
capacitive loads up to 300 pF. The input can operate
100 mV below the negative rail and within 2 V of the
top rail during normal operation. The device can
operate with full rail-to-rail input 100 mV beyond the
top rail, but with reduced performance within 2 V of
the top rail.
The OPAx171-Q1 op amp is specified from –40°C to
125°C.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
OPA171-Q1
SOT (5)
2.90 mm × 1.60 mm
OPA2171-Q1
SOIC (8)
4.90 mm × 3.91 mm
SOIC (14)
8.65 mm × 3.91 mm
TSSOP (14)
5.00 mm × 4.40 mm
2 Applications
OPA4171-Q1
•
•
•
•
•
•
•
•
•
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Tracking Amplifier in Power Modules
Merchant Power Supplies
Transducer Amplifiers
Bridge Amplifiers
Temperature Measurements
Strain Gauge Amplifiers
Precision Integrators
Battery-Powered Instruments
Test Equipment
Space
Offset Voltage vs Common-mode Voltage
1000
Offset Voltage vs Power Supply
10 Typical Units Shown
800
350
VSUPPLY = ±1.35V to ±18V
10 Typical Units Shown
600
250
200
150
0
VOS (mV)
VOS (mV)
400
-200
-400
-600
50
-50
-150
-800
VCM = -18.1V
-250
-1000
-20
-15
-10
-5
0
VCM (V)
5
10
15
20
-350
0
2
4
6
8
10
12
14
16
18
20
VSUPPLY (V)
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. UNLESS OTHERWISE NOTED, this document contains PRODUCTION
DATA.
OPA171-Q1, OPA2171-Q1, OPA4171-Q1
SBOS556B – JUNE 2011 – REVISED DECEMBER 2014
www.ti.com
Table of Contents
1
2
3
4
5
6
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Pin Configuration and Functions .........................
Specifications.........................................................
1
1
1
2
3
4
6.1
6.2
6.3
6.4
4
5
5
Absolute Maximum Ratings ......................................
ESD Ratings..............................................................
Recommended Operating Conditions.......................
Thermal Information — OPA171-Q1 and OPA2171Q1 .............................................................................
6.5 Thermal Information — OPA4171-Q1.......................
6.6 Electrical Characteristics...........................................
6.7 Typical Characteristics ..............................................
7
7.3 Feature Description................................................. 14
7.4 Device Functional Modes........................................ 16
8
Application and Implementation ........................ 17
8.1 Application Information............................................ 17
8.2 Typical Application .................................................. 18
9 Power Supply Recommendations...................... 20
10 Layout................................................................... 20
10.1 Layout Guidelines ................................................. 20
10.2 Layout Example .................................................... 21
11 Device and Documentation Support ................. 21
5
5
5
7
Detailed Description ............................................ 14
7.1 Overview ................................................................. 14
7.2 Functional Block Diagram ....................................... 14
11.1
11.2
11.3
11.4
11.5
Documentation Support ........................................
Related Links ........................................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
21
21
21
22
22
12 Mechanical, Packaging, and Orderable
Information ........................................................... 22
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision A (September 2012) to Revision B
Page
•
Added the Handling Ratings table, Feature Description section, Device Functional Modes section, Application and
Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation
Support section, and Mechanical, Packaging, and Orderable Information section ............................................................... 1
•
Added the OPA2171-Q1 and OPA4171-Q1 devices to the data sheet ................................................................................ 1
Changes from Original (June, 2011) to Revision A
Page
•
Added second bullet to Features: AEC-Q100 Test Guidance With the Following Results: –Device Temperature
Grade1: -40°C to 125°C Ambient Operating Temperature Range –Device HBM ESD Classification Level H2
–Device CDM ESD Classification Level C3A ......................................................................................................................... 1
•
Added classification levels to ESD ratings in Absolute Maximum Ratings table. .................................................................. 4
•
Added row to Absolute Maximum Ratings table: Latch-up per JESD78D with Class 1 value. .............................................. 4
2
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SBOS556B – JUNE 2011 – REVISED DECEMBER 2014
5 Pin Configuration and Functions
DBV Package
5-Pin SOT23
OPA171-Q1 Top View
OUT
1
V-
2
+IN
3
5
4
D Package
8-Pin SOIC
OPA2171-Q1 Top View
V+
-IN
OUT A
1
8
V+
–IN A
2
7
OUT B
+IN A
3
6
–IN B
V–
4
5
+IN B
Pin Functions — DBV (5) and D (8) Packages
PIN
OPA171-Q1
DBV (5)
OPA2171-Q1
D (8)
I/O
+IN
3
—
I
Noninverting input
+IN A
—
3
I
Noninverting input, channel A
+IN B
—
5
I
Noninverting input, channel B
–IN
4
—
I
Inverting input
–IN A
—
2
I
Inverting input, channel A
–IN B
—
6
I
Inverting input, channel B
OUT
1
—
O
Output
OUT A
—
1
O
Output, channel A
OUT B
—
7
O
Output, channel B
V+
5
7
—
Positive (highest) power supply
V–
2
4
—
Negative (lowest) power supply
NAME
Copyright © 2011–2014, Texas Instruments Incorporated
DESCRIPTION
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D and PW Packages
14-Pin SOIC and TSSOP
OPA4171-Q1 Top View
OUT A
1
14
OUT D
-IN A
2
13
-IN D
+IN A
3
12
+IN D
V+
4
11
V-
+IN B
5
10
+IN C
-IN B
6
9
-IN C
OUT B
7
8
OUT C
Pin Functions — D (14) and PW (14) Packages
PIN
I/O
DESCRIPTION
NAME
D (14), PW (14)
+IN A
3
I
Noninverting input, channel A
+IN B
5
I
Noninverting input, channel B
+IN C
10
I
Noninverting input, channel C
+IN D
12
I
Noninverting input, channel D
–IN A
2
I
Inverting input, channel A
–IN B
6
I
Inverting input, channel B
–IN C
9
I
Inverting input, channel C
–IN D
13
I
Inverting input, channel D
OUT A
1
O
Output, channel A
OUT B
7
O
Output, channel B
OUT C
8
O
Output, channel C
OUT D
14
O
Output, channel D
V+
4
—
Positive (highest) power supply
V–
11
—
Negative (lowest) power supply
6 Specifications
6.1 Absolute Maximum Ratings
Over operating free-air temperature range, unless otherwise noted. (1)
MIN
MAX
UNIT
40
V
Supply voltage
Signal input
terminals
Voltage
(V–) – 0.5
(V+) + 0.5
V
±10
mA
150
°C
150
°C
150
°C
Current
Output short circuit (2)
Continuous
Operating temperature
–55
Junction temperature
Latch-up per JESD78D
Class 1
Storage temperature, Tstg
(1)
(2)
4
–65
Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may
degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond
those specified is not implied.
Short-circuit to ground, one amplifier per package.
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SBOS556B – JUNE 2011 – REVISED DECEMBER 2014
6.2 ESD Ratings
VALUE
UNIT
OPA171-Q1 IN DBV PACKAGE
V(ESD)
Electrostatic discharge
Human body model (HBM), per AEC Q100-002 (1)
±4000
Charged device model (CDM), per AEC Q100-011
±500
V
OPA2171-Q1 IN D PACKAGE AND OPA4171-Q1 IN D AND PW PACKAGES
V(ESD)
(1)
Electrostatic discharge
Human body model (HBM), per AEC Q100-002 (1)
±2000
Charged device model (CDM), per AEC Q100-011
±1000
V
AEC Q100-002 indicates HBM stressing is done in accordance with the ANSI/ESDA/JEDEC JS-001 specification.
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
MIN
Supply voltage (V+ – V–)
Specified temperature
NOM
MAX
UNIT
4.5 (±2.25)
36 (±18)
V
–40
125
°C
6.4 Thermal Information — OPA171-Q1 and OPA2171-Q1
OPA171-Q1
THERMAL METRIC
(1)
OPA2171-Q1
DBV
D
5 PINS
8 PINS
RθJA
Junction-to-ambient thermal resistance
277.3
116.1
RθJC(top)
Junction-to-case(top) thermal resistance
193.3
69.8
RθJB
Junction-to-board thermal resistance
121.2
56.6
ψJT
Junction-to-top characterization parameter
51.8
22.5
ψJB
Junction-to-board characterization parameter
109.5
56.1
(1)
UNIT
°C/W
For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
6.5 Thermal Information — OPA4171-Q1
OPA4171-Q1
THERMAL METRIC (1)
D
PW
14 PINS
14 PINS
RθJA
Junction-to-ambient thermal resistance
93.2
106.9
RθJC(top)
Junction-to-case(top) thermal resistance
51.8
24.4
RθJB
Junction-to-board thermal resistance
49.4
59.3
ψJT
Junction-to-top characterization parameter
13.5
0.6
ψJB
Junction-to-board characterization parameter
42.2
54.3
(1)
UNIT
°C/W
For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
6.6 Electrical Characteristics
At TA = 25°C, VS = 2.7 to 36 V, VCM = VOUT = VS / 2, and RLOAD = 10 kΩ connected to VS / 2, unless otherwise noted. The
specified temperature range is TA = –40°C to 125°C.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
0.25
±1.8
mV
0.3
±2
mV
0.3
(1)
µV/°C
±3
µV/V
OFFSET VOLTAGE
VOS
Input offset voltage
Input offset voltage over temperature
dVOS/dT
Input offset voltage drift (over
temperature)
PSRR
Input offset voltage over temperature
vs power supply
VS = 4 to 36 V
1
Channel separation, DC
(1)
±2
5
µV/V
Not production tested.
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Electrical Characteristics (continued)
At TA = 25°C, VS = 2.7 to 36 V, VCM = VOUT = VS / 2, and RLOAD = 10 kΩ connected to VS / 2, unless otherwise noted. The
specified temperature range is TA = –40°C to 125°C.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
±15
pA
±3.5
nA
INPUT BIAS CURRENT
IB
Input bias current
±8
Input bias current over temperature
IOS
Input offset current
±4
pA
Input offset current over temperature
±3.5
nA
NOISE
Input voltage noise
en
f = 0.1 Hz to 10 Hz
Input voltage noise density
3
µVPP
f = 100 Hz
25
nV/√Hz
f = 1 kHz
14
nV/√Hz
INPUT VOLTAGE
Common-mode voltage range (2)
VCM
(V–) – 0.1
Common-mode rejection ratio (over
temperature)
CMRR
(V+) – 2
V
VS = ±2 V, (V–) – 0.1 V < VCM < (V+) – 2
V
90
104
dB
VS = ±18 V, (V–) – 0.1 V < VCM < (V+) – 2
V
104
120
dB
INPUT IMPEDANCE
Differential
Common-mode
100 || 3
MΩ || pF
6 || 3
1012Ω ||
pF
130
dB
3.0
MHz
1.5
V/µs
OPEN-LOOP GAIN
Open-loop voltage gain (over
temperature)
AOL
VS = +4V to +36V, (V–) + 0.35V < VO <
(V+) – 0.35V
110
FREQUENCY RESPONSE
GBP
Gain bandwidth product
SR
Slew rate
G=1
To 0.1%, VS = ±18 V, G = 1, 10-V step
tS
Settling time
To 0.01% (12 bit), VS = ±18 V, G = 1, 10-V
step
Overload recovery time
V±IN × Gain > VS
Total harmonic distortion + noise
G = 1, f = 1 kHz, VO = 3 VRMS
VO
Voltage output swing from rail (over
temperature)
RL = 10 kΩ, AOL ≥ 110 dB
ISC
Short-circuit current
CLOAD
Capacitive load drive
RO
Open-loop output resistance
THD+N
6
µs
10
µs
2
µs
0.0002%
OUTPUT
(V–) + 0.35
Sourcing
(V+) – 0.35
25
Sinking
mA
–35
See the Typical Characteristics section
f = 1 MHz, IO = 0 A
V
pF
Ω
150
POWER SUPPLY
VS
Specified voltage range
IQ
Quiescent current per amplifier
IO = 0 A
2.7
Quiescent current per amplifier (over
temperature)
IO = 0 A
475
36
V
595
µA
650
µA
TEMPERATURE
(2)
6
Specified range
–40
125
°C
Operating range
–55
150
°C
The input range can be extended beyond (V+) – 2 V up to V+. See the and Detailed Description sections for additional information.
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SBOS556B – JUNE 2011 – REVISED DECEMBER 2014
6.7 Typical Characteristics
VS = ±18V, VCM = VS/2, RLOAD = 10kΩ connected to VS/2, and CL = 100pF, unless otherwise noted.
Table 1. Characteristic Performance Measurements
DESCRIPTION
FIGURE
Offset Voltage Production Distribution
Figure 1
Offset Voltage Drift Distribution
Figure 2
Offset Voltage vs Temperature
Figure 3
Offset Voltage vs Common-Mode Voltage
Figure 4
Offset Voltage vs Common-Mode Voltage (Upper Stage)
Figure 5
Offset Voltage vs Power Supply
Figure 6
IB and IOS vs Common-Mode Voltage
Figure 7
Input Bias Current vs Temperature
Figure 8
Output Voltage Swing vs Output Current (Maximum Supply)
Figure 9
CMRR and PSRR vs Frequency (Referred-to Input)
Figure 10
CMRR vs Temperature
Figure 11
PSRR vs Temperature
Figure 12
0.1Hz to 10Hz Noise
Figure 13
Input Voltage Noise Spectral Density vs Frequency
Figure 14
THD+N Ratio vs Frequency
Figure 15
THD+N vs Output Amplitude
Figure 16
Quiescent Current vs Temperature
Figure 17
Quiescent Current vs Supply Voltage
Figure 18
Open-Loop Gain and Phase vs Frequency
Figure 19
Closed-Loop Gain vs Frequency
Figure 20
Open-Loop Gain vs Temperature
Figure 21
Open-Loop Output Impedance vs Frequency
Figure 22
Small-Signal Overshoot vs Capacitive Load (100-mV Output Step)
Figure 23, Figure 24
No Phase Reversal
Figure 25
Positive Overload Recovery
Figure 26
Negative Overload Recovery
Figure 27
Small-Signal Step Response (100 mV)
Figure 28, Figure 29
Large-Signal Step Response
Figure 30, Figure 31
Large-Signal Settling Time (10-V Positive Step)
Figure 32
Large-Signal Settling Time (10-V Negative Step)
Figure 33
Short-Circuit Current vs Temperature
Figure 34
Maximum Output Voltage vs Frequency
Figure 35
Channel Separation vs Frequency
Figure 36
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Distribution Taken From 3500 Amplifiers
14
Percentage of Amplifiers (%)
Percentage of Amplifiers (%)
16
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12
10
8
6
4
2
0
Distribution Taken From 110 Amplifiers
20
15
10
5
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
100
200
300
400
500
600
700
800
900
1000
1100
1200
0
Offset Voltage Drift (mV/°C)
Offset Voltage (mV)
Figure 2. Offset Voltage Drift Distribution
Figure 1. Offset Voltage Production Distribution
1000
600
5 Typical Units Shown
10 Typical Units Shown
800
400
400
VOS (mV)
Offset Voltage (mV)
600
200
0
-200
200
0
-200
-400
-400
-600
-600
-800
-800
VCM = -18.1V
-1000
-75
-50
-25
0
25
50
75
100
125
150
-20
-15
-10
0
-5
Figure 3. Offset Voltage vs Temperature
10000
5
10
15
20
VCM (V)
Temperature (°C)
Figure 4. Offset Voltage vs Common-mode Voltage
350
10 Typical Units Shown
8000
VSUPPLY = ±1.35V to ±18V
10 Typical Units Shown
250
6000
150
2000
VOS (mV)
VOS (mV)
4000
0
-2000
-4000
Normal
Operation
-250
-8000
-10000
15.5
-50
-150
VCM = +18.1V
-6000
50
-350
16
16.5
17
17.5
18
18.5
0
2
4
6
VCM (V)
Figure 5. Offset Voltage vs Common-mode Voltage (Upper
Stage)
8
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8
10
12
14
16
18
20
VSUPPLY (V)
Figure 6. Offset Voltage vs Power Supply
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15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
10000
IB+
-IB
+IB
-IOS
VCM = -18.1V
IB-
1000
Input Bias Current (pA)
IB and IOS (pA)
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IB
IOS
100
10
IOS
1
VCM = 16V
0
-20
-18
-12
0
-6
6
12
18
20
-75
-50
0
-25
VCM (V)
Figure 7. IB and IOS vs Common-Mode Voltage
75
100
125
150
Figure 8. Input Bias Current vs Temperature
Common-Mode Rejection Ratio (dB),
Power-Supply Rejection Ratio (dB)
17
Output Voltage (V)
50
140
18
16
15
14.5
-14.5
-15
-40°C
+25°C
+85°C
+125°C
-16
-17
120
100
80
60
40
+PSRR
-PSRR
CMRR
20
0
-18
0
2
4
6
8
10
12
14
1
16
10
100
1k
10k
100k
1M
10M
Frequency (Hz)
Output Current (mA)
Figure 9. Output Voltage Swing vs Output Current
(Maximum Supply)
Figure 10. CMRR and PSRR vs Frequency (Referred-to
Input)
30
3
Power-Supply Rejection Ratio (mV/V)
Common-Mode Rejection Ratio (mV/V)
25
Temperature (°C)
20
10
0
-10
VS = 2.7V
-20
VS = 4V
VS = 36V
-30
2
1
0
-1
-2
VS = 2.7V to 36V
VS = 4V to 36V
-3
-75
-50
-25
0
25
50
75
100
125
150
-75
-50
-25
0
25
50
75
100
Temperature (°C)
Temperature (°C)
Figure 11. CMRR vs Temperature
Figure 12. PSRR vs Temperature
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150
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1mV/div
Voltage Noise Density (nV/ÖHz)
1000
100
10
1
Time (1s/div)
1
10
100
1k
10k
100k
1M
Frequency (Hz)
Figure 13. 0.1- to 10-Hz Noise
Figure 14. Input Voltage Noise Spectral Density vs
Frequency
-120
0.0001
G = +1, RL = 10kW
G = -1, RL = 2kW
0.00001
10
100
1k
10k
-140
20k
Total Harmonic Distortion + Noise (%)
Total Harmonic Distortion + Noise (%)
-100
0.001
0.1
BW = 80kHz
0.01
-100
0.001
-120
0.0001
G = +1, RL = 10kW
G = -1, RL = 2kW
0.00001
0.01
-140
0.1
1
10
20
Output Amplitude (VRMS)
Frequency (Hz)
Figure 15. THD+N Ratio vs Frequency
Figure 16. THD+N vs Output Amplitude
0.65
0.6
0.6
0.55
0.5
IQ (mA)
0.55
IQ (mA)
-80
Total Harmonic Distortion + Noise (dB)
-80
VOUT = 3VRMS
BW = 80kHz
Total Harmonic Distortion + Noise (dB)
0.01
0.5
0.45
0.45
0.4
0.35
0.4
0.3
0.35
0.25
Specified Supply-Voltage Range
-75
-50
-25
0
25
50
75
100
125
Temperature (°C)
Figure 17. Quiescent Current vs Temperature
10
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150
0
4
8
12
16
20
24
28
32
36
Supply Voltage (V)
Figure 18. Quiescent Current vs Supply Voltage
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180
180
25
Gain
20
135
135
15
Phase
45
45
Gain (dB)
90
Phase (°)
Gain (dB)
10
90
5
0
-5
-10
0
0
G = 10
G=1
G = -1
-15
-45
10M
-45
1
10
100
1k
10k
100k
1M
-20
10k
100k
1M
Figure 19. Open-Loop Gain and Phase vs Frequency
3
Figure 20. Closed-Loop Gain vs Frequency
5 Typical Units Shown
VS = 2.7V
VS = 4V
VS = 36V
100k
10k
ZO (W)
2
1.5
1
1k
100
10
0.5
1
0
1m
-75
-50
-25
0
25
50
75
100
150
125
1
10
100
Temperature (°C)
10k
100k
1M
10M
Figure 22. Open-Loop Output Impedance vs Frequency
50
RL = 10kW
ROUT = 0W
40
40
ROUT = 25W
35
35
ROUT = 50W
30
25
20
15
ROUT = 0W
10
ROUT = 25W
5
ROUT = 50W
G = +1
+18V
Overshoot (%)
45
45
1k
Frequency (Hz)
Figure 21. Open-Loop Gain vs Temperature
50
Overshoot (%)
100M
1M
2.5
AOL (mV/V)
10M
Frequency (Hz)
Frequency (Hz)
30
25
20
RI = 10kW
15
ROUT
-18V
RF = 10kW
G = -1
+18V
OPA171
RL
CL
10
ROUT
OPA171
CL
5
-18V
0
0
0
100 200 300 400 500 600 700 800 900 1000
0
100 200 300 400 500 600 700 800 900 1000
Capacitive Load (pF)
Capacitive Load (pF)
Figure 23. Small-Signal Overshoot vs Capacitive Load (100mV Output Step)
Figure 24. Small-Signal Overshoot vs Capacitive Load (100mV Output Step)
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+18V
Output
VOUT
OPA171
VIN
5V/div
5V/div
-18V
37VPP
Sine Wave
(±18.5V)
20kW
+18V
2kW
OPA171
Output
VOUT
VIN
-18V
G = -10
Time (5ms/div)
Time (100ms/div)
Figure 25. No Phase Reversal
Figure 26. Positive Overload Recovery
RL = 10kW
CL = 100pF
+18V
OPA171
RL
CL
20mV/div
-18V
VIN
5V/div
G = +1
20kW
+18V
2kW
OPA171
VOUT
VIN
VOUT
-18V
G = -10
Time (1ms/div)
Time (5ms/div)
Figure 27. Negative Overload Recovery
Figure 28. Small-Signal Step Response (100 mV)
G = +1
RL = 10kW
CL = 100pF
RI
= 2kW
RF
= 2kW
2V/div
20mV/div
CL = 100pF
+18V
OPA171
CL
-18V
G = -1
Time (20ms/div)
Figure 29. Small-Signal Step Response (100 mV)
Time (5ms/div)
Figure 30. Large-Signal Step Response
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10
G = -1
RL = 10kW
CL = 100pF
G = -1
2V/div
D From Final Value (mV)
8
6
4
12-Bit Settling
2
0
-2
(±1/2LSB = ±0.024%)
-4
-6
-8
-10
Time (4ms/div)
0
4
8
12
16
20
24
28
32
36
Time (ms)
Figure 31. Large-Signal Step Response
Figure 32. Large-Signal Settling Time (10-V Positive Step)
10
45
ISC, Sink
40
6
4
35
12-Bit Settling
2
ISC (mA)
D From Final Value (mV)
50
G = -1
8
0
-2
(±1/2LSB = ±0.024%)
30
25
20
-4
15
-6
10
-8
5
ISC, Source
0
-10
0
4
8
12
16
20
24
28
32
36
-75
-50
-25
Time (ms)
0
25
50
75
100
125
150
Temperature (°C)
Figure 33. Large-Signal Settling Time (10-V Negative Step)
Figure 34. Short-Circuit Current vs Temperature
15
-60
VS = ±15V
10
Channel Separation (dB)
Output Voltage (VPP)
12.5
Maximum output voltage without
slew-rate induced distortion.
7.5
VS = ±5V
5
2.5
-70
-80
-90
-100
-110
VS = ±1.35V
0
-120
10k
100k
1M
10M
10
100
1k
Frequency (Hz)
Figure 35. Maximum Output Voltage vs Frequency
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10k
100k
Frequency (Hz)
Figure 36. Channel Separation vs Frequency
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7 Detailed Description
7.1 Overview
The OPAx171-Q1 family of operational amplifiers provide high overall performance, making them ideal for many
general-purpose applications. The excellent offset drift of only 1.5 μV/°C (maximum) provides excellent stability
over the entire temperature range. In addition, the device offers very good overall performance with high CMRR,
PSRR, AOL, and superior THD.
7.2 Functional Block Diagram
OPA171-Q1
+
PCH
FF Stage
±
Ca
Cb
+IN
+
+
PCH
Input Stage
±IN
±
+
2
±
nd
Output
Stage
Stage
OUT
±
+
NCH
Input Stage
±
7.3 Feature Description
7.3.1 Operating Characteristics
The OPAx171-Q1 family of devices is specified for operation from 2.7 to 36 V (±1.35 to ±18 V). Many of the
specifications apply from –40°C to 125°C. Parameters that can exhibit significant variance with regard to
operating voltage or temperature are shown in the section.
7.3.2 Phase-Reversal Protection
The OPAx171-Q1 family of devices has an internal phase-reversal protection. Many op amps exhibit a phase
reversal when the input is driven beyond its linear common-mode range. This condition is most often
encountered in noninverting circuits when the input is driven beyond the specified common-mode voltage range,
causing the output to reverse into the opposite rail. The input of the OPAx171 family of devices prevents phase
reversal with excessive common-mode voltage. Instead, the output limits into the appropriate rail. Figure 37
shows this performance.
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Feature Description (continued)
+18V
Output
OPA171
5V/div
-18V
37VPP
Sine Wave
(±18.5V)
Output
Time (100ms/div)
Figure 37. No Phase Reversal
7.3.3 Capacitive Load and Stability
The dynamic characteristics of the OPAx171-Q1 family of devices have been optimized for commonly
encountered operating conditions. The combination of low closed-loop gain and high capacitive loads decreases
the phase margin of the amplifier and can lead to gain peaking or oscillations. As a result, heavier capacitive
loads must be isolated from the output. The simplest way to achieve this isolation is to add a small resistor (for
example, ROUT equal to 50 Ω) in series with the output. Figure 38 and Figure 39 show small-signal overshoot
versus capacitive load for several values of ROUT. Also, for details of analysis techniques and application circuits,
refer to the Applications Bulletin AB-028 (SBOA015), available for download from TI.com.
50
45
ROUT = 0W
40
40
ROUT = 25W
35
35
ROUT = 50W
30
25
20
15
ROUT = 0W
10
ROUT = 25W
5
ROUT = 50W
G = +1
+18V
Overshoot (%)
Overshoot (%)
50
RL = 10kW
45
30
25
20
RI = 10kW
15
ROUT
-18V
RF = 10kW
G = -1
+18V
OPA171
RL
CL
10
ROUT
OPA171
CL
5
-18V
0
0
0
100 200 300 400 500 600 700 800 900 1000
0
100 200 300 400 500 600 700 800 900 1000
Capacitive Load (pF)
Capacitive Load (pF)
Figure 38. Small-Signal Overshoot versus Capacitive Load
(100-mV Output Step)
Figure 39. Small-Signal Overshoot versus Capacitive Load
(100-mV Output Step)
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7.4 Device Functional Modes
7.4.1 Common-Mode Voltage Range
The input common-mode voltage range of the OPAx171 family of devices extends 100 mV below the negative
rail and within 2 V of the top rail for normal operation.
This device can operate with full rail-to-rail input 100 mV beyond the top rail, but with reduced performance within
2 V of the top rail. The typical performance in this range is summarized in Table 2.
Table 2. Typical Performance Range
PARAMETER
MIN
Input Common-Mode Voltage
TYP
(V+) – 2
Offset voltage
vs Temperature
Common-mode rejection
MAX
UNIT
(V+) + 0.1
V
7
mV
12
µV/°C
65
dB
Open-loop gain
60
dB
GBW
0.7
MHz
Slew rate
0.7
V/µs
Noise at f = 1kHz
30
nV/√Hz
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8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The OPAx171-Q1 operational amplifier provides high overall performance, making it ideal for many generalpurpose applications. The excellent offset drift of only 2 µV/°C provides excellent stability over the entire
temperature range. In addition, the device offers very-good overall performance with high CMRR, PSRR, and
AOL. As with all amplifiers, applications with noisy or high-impedance power supplies require decoupling
capacitors close to the device pins. In most cases, 0.1-µF capacitors are adequate.
8.1.1 Electrical Overstress
Designers often ask questions about the capability of an op amp to withstand electrical overstress. These
questions tend to focus on the device inputs, but may involve the supply voltage pins or even the output pin.
Each of these different pin functions have electrical stress limits determined by the voltage breakdown
characteristics of the particular semiconductor fabrication process and specific circuits connected to the pin.
Additionally, internal electrostatic discharge (ESD) protection is built into these circuits to protect them from
accidental ESD events both before and during product assembly.
These ESD protection diodes also provide in-circuit, input overdrive protection, as long as the current is limited to
10 mA as stated in the Absolute Maximum Ratings table. Figure 40 shows how a series input resistor can be
added to the driven input to limit the input current. The added resistor contributes thermal noise at the amplifier
input and its value should be kept to a minimum in noise-sensitive applications.
V+
IOVERLOAD
10mA max
OPA171
VOUT
VIN
5kW
Figure 40. Input Current Protection
An ESD event produces a short duration, high-voltage pulse that is transformed into a short duration, highcurrent pulse as it discharges through a semiconductor device. The ESD protection circuits are designed to
provide a current path around the operational amplifier core to prevent it from being damaged. The energy
absorbed by the protection circuitry is then dissipated as heat.
When the operational amplifier connects into a circuit, the ESD protection components are intended to remain
inactive and not become involved in the application circuit operation. However, circumstances may arise where
an applied voltage exceeds the operating voltage range of a given pin. Should this condition occur, there is a risk
that some of the internal ESD protection circuits may be biased on, and conduct current. Any such current flow
occurs through ESD cells and rarely involves the absorption device.
If the ability of the supply to absorb this current is uncertain, external zener diodes may be added to the supply
pins. The zener voltage must be selected such that the diode does not turn on during normal operation.
However, the zener voltage should be low enough so that the zener diode conducts if the supply pin begins to
rise above the safe operating supply voltage level.
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8.2 Typical Application
8.2.1 Capacitive Load Drive Solution Using an Isolation Resistor
The OPA171-Q1 device can be used capacitive loads such as cable shields, reference buffers, MOSFET gates,
and diodes. The circuit uses an isolation resistor (RISO) to stabilize the output of an op amp. RISO modifies the
open loop gain of the system to ensure the circuit has sufficient phase margin.
+VS
VOUT
RISO
+
VIN
+
±
CLOAD
-VS
Figure 41. Unity-Gain Buffer with RISO Stability Compensation
8.2.1.1 Design Requirements
The design requirements are:
• Supply voltage: 30 V (±15 V)
• Capacitive loads: 100 pF, 1000 pF, 0.01 μF, 0.1 μF, and 1 μF
• Phase margin: 45° and 60°
8.2.1.2 Detailed Design Procedure
shows a unity-gain buffer driving a capacitive load. Equation 1 shows the transfer function for the circuit in . Not
shown in is the open-loop output resistance of the op amp, Ro.
1 + CLOAD × RISO × s
T(s) =
1 + Ro + RISO × CLOAD × s
(1)
The transfer function in Equation 1 has a pole and a zero. The frequency of the pole (fp) is determined by (Ro +
RISO) and CLOAD. Components RISO and CLOAD determine the frequency of the zero (fz). A stable system is
obtained by selecting RISO such that the rate of closure (ROC) between the open-loop gain (AOL) and 1/β is 20
dB/decade. Figure 42 depicts the concept. The 1/β curve for a unity-gain buffer is 0 dB.
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Typical Application (continued)
120
AOL
100
1
fp
2 u Œ u RISO R o
Gain (dB)
80
60
u CLOAD
40 dB
1
fz
2 u Œ u RISO u CLOAD
40
1 dec
1/
20
ROC
20 dB
dec
0
10
100
1k
10k
100k
10M
1M
100M
Frequency (Hz)
Figure 42. Unity-Gain Amplifier with RISO Compensation
ROC stability analysis is typically simulated. The validity of the analysis depends on multiple factors, especially
the accurate modeling of Ro. In addition to simulating the ROC, a robust stability analysis includes a
measurement of overshoot percentage and AC gain peaking of the circuit using a function generator,
oscilloscope, and gain and phase analyzer. Phase margin is then calculated from these measurements. shows
the overshoot percentage and AC gain peaking that correspond to phase margins of 45° and 60°. For more
details on this design and other alternative devices that can be used in place of the OPA171, refer to the
Precision Design, Capacitive Load Drive Solution using an Isolation Resistor (TIPD128).
Table 3. Phase Margin versus Overshoot and AC Gain Peaking
PHASE MARGIN
OVERSHOOT
AC GAIN PEAKING
45°
23.3%
2.35 dB
60°
8.8%
0.28 dB
8.2.1.3 Application Curves
The OPA171-Q1 device meets the supply voltage requirements of 30 V. The OPA171-Q1 device was tested for
various capacitive loads and RISO was adjusted to achieve an overshoot corresponding to . shows the test
results.
10000
Isolation Resistor, RISO (:)
45q Phase Margin
60q Phase Margin
1000
100
10
1
0.01
0.1
1
10
Capacitive Load (nF)
100
1000
D001
Figure 43. RISO vs CLOAD
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9 Power Supply Recommendations
The OPAx171-Q1 family of devices is specified for operation from 4.5 V to 36 V (±2.25 V to ±18 V); many
specifications apply from –40°C to 125°C. Parameters that can exhibit significant variance with regard to
operating voltage or temperature are presented in the Typical Characteristics section.
CAUTION
Supply voltages larger than 40 V can permanently damage the device; see the
Absolute Maximum Ratings table.
Place 0.1-μF bypass capacitors close to the power-supply pins to reduce errors coupling in from noisy or highimpedance power supplies. For detailed information on bypass capacitor placement, see the Layout section.
10 Layout
10.1 Layout Guidelines
For best operational performance of the device, use good printed circuit board (PCB) layout practices, including:
• Noise can propagate into analog circuitry through the power pins of the circuit as a whole and op amp
itself. Bypass capacitors are used to reduce the coupled noise by providing low-impedance power
sources local to the analog circuitry.
– Connect low-ESR, 0.1-µF ceramic bypass capacitors between each supply pin and ground, placed as
close to the device as possible. A single bypass capacitor from V+ to ground is applicable for singlesupply applications.
• Separate grounding for analog and digital portions of circuitry is one of the simplest and most-effective
methods of noise suppression. One or more layers on multilayer PCBs are usually devoted to ground
planes. A ground plane helps distribute heat and reduces EMI noise pickup. Make sure to physically
separate digital and analog grounds paying attention to the flow of the ground current. See Circuit Board
Layout Techniques, SLOA089, for detailed information.
• In order to reduce parasitic coupling, run the input traces as far away from the supply or output traces as
possible. If it is not possible to keep them separate, it is much better to cross the sensitive trace
perpendicular as opposed to in parallel with the noisy trace.
• Place the external components as close to the device as possible. As shown in Figure 44, keeping RF
and RG close to the inverting input minimizes parasitic capacitance.
• Keep the length of input traces as short as possible. Always remember that the input traces are the most
sensitive part of the circuit.
• Consider a driven, low-impedance guard ring around the critical traces. A guard ring can significantly
reduce leakage currents from nearby traces that are at different potentials.
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10.2 Layout Example
RIN
+
VIN
VOUT
RG
RF
(Schematic Representation)
Place components
close to device and to
each other to reduce
parasitic errors
Run the input traces
as far away from
the supply lines
as possible
VS+
RF
NC
NC
±IN
V+
+IN
OUT
V±
NC
RG
GND
VIN
GND
RIN
Only needed for
dual-supply
operation
GND
VS±
(or GND for single supply)
Use low-ESR, ceramic
bypass capacitor
VOUT
Ground (GND) plane on another layer
Figure 44. Operational Amplifier Board Layout for Noninverting Configuration
11 Device and Documentation Support
11.1 Documentation Support
11.1.1 Related Documentation
For related documentation see the following:
• Applications Bulletin AB-028, SBOA015
• Capacitive Load Drive Solution using an Isolation Resistor, TIDU032
• Circuit Board Layout Techniques, SLOA089
11.2 Related Links
The table below lists quick access links. Categories include technical documents, support and community
resources, tools and software, and quick access to sample or buy.
Table 4. Related Links
PARTS
PRODUCT FOLDER
SAMPLE & BUY
TECHNICAL
DOCUMENTS
TOOLS &
SOFTWARE
SUPPORT &
COMMUNITY
OPA171-Q1
Click here
Click here
Click here
Click here
Click here
OPA2171-Q1
Click here
Click here
Click here
Click here
Click here
OPA4171-Q1
Click here
Click here
Click here
Click here
Click here
11.3 Trademarks
All trademarks are the property of their respective owners.
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11.4 Electrostatic Discharge Caution
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
11.5 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
12 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
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PACKAGE OPTION ADDENDUM
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14-Nov-2015
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
Lead/Ball Finish
MSL Peak Temp
(2)
(6)
(3)
Op Temp (°C)
Device Marking
(4/5)
OPA171AQDBVRQ1
ACTIVE
SOT-23
DBV
5
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
-40 to 125
OULQ
OPA2171AQDGKRQ1
PREVIEW
VSSOP
DGK
8
2500
Green (RoHS
& no Sb/Br)
CU NIPDAUAG
Level-2-260C-1 YEAR
-40 to 125
2171
OPA2171AQDRQ1
ACTIVE
SOIC
D
8
2500
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-3-260C-168 HR
-40 to 125
2171AQ
OPA4171AQDRQ1
ACTIVE
SOIC
D
14
2500
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-3-260C-168 HR
-40 to 125
OPA4171Q1
OPA4171AQPWRQ1
ACTIVE
TSSOP
PW
14
2000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-3-260C-168 HR
-40 to 125
O4171Q1
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3)
MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4)
There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5)
Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
Addendum-Page 1
Samples
PACKAGE OPTION ADDENDUM
www.ti.com
14-Nov-2015
(6)
Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish
value exceeds the maximum column width.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
OTHER QUALIFIED VERSIONS OF OPA171-Q1, OPA2171-Q1, OPA4171-Q1 :
• Catalog: OPA171, OPA2171, OPA4171
• Enhanced Product: OPA2171-EP
NOTE: Qualified Version Definitions:
• Catalog - TI's standard catalog product
• Enhanced Product - Supports Defense, Aerospace and Medical Applications
Addendum-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
18-Feb-2015
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
Diameter Width (mm)
(mm) W1 (mm)
B0
(mm)
K0
(mm)
P1
(mm)
OPA171AQDBVRQ1
SOT-23
DBV
5
3000
180.0
8.4
OPA2171AQDRQ1
SOIC
D
8
2500
330.0
OPA4171AQDRQ1
SOIC
D
14
2500
330.0
OPA4171AQPWRQ1
TSSOP
PW
14
2000
330.0
3.23
3.17
1.37
4.0
8.0
Q3
12.4
6.4
5.2
2.1
8.0
12.0
Q1
16.4
6.5
9.0
2.1
8.0
16.0
Q1
12.4
6.9
5.6
1.6
8.0
12.0
Q1
Pack Materials-Page 1
W
Pin1
(mm) Quadrant
PACKAGE MATERIALS INFORMATION
www.ti.com
18-Feb-2015
*All dimensions are nominal
Device
Package Type
Package Drawing
Pins
SPQ
Length (mm)
Width (mm)
Height (mm)
OPA171AQDBVRQ1
SOT-23
DBV
5
3000
202.0
201.0
28.0
OPA2171AQDRQ1
SOIC
D
8
2500
367.0
367.0
35.0
OPA4171AQDRQ1
SOIC
D
14
2500
367.0
367.0
38.0
OPA4171AQPWRQ1
TSSOP
PW
14
2000
367.0
367.0
35.0
Pack Materials-Page 2
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