Allegro A3123LT Hall-effect switches for high-temperature operation Datasheet

Data Sheet
27621.4B
3121, 3122, AND
3123
HALL-EFFECT SWITCHES
FOR HIGH-TEMPERATURE OPERATION
X
These Hall-effect switches are monolithic integrated circuits with
tighter magnetic specifications, designed to operate continuously over
extended temperatures to +150°C, and are more stable with both temperature and supply voltage changes. The unipolar switching characteristic makes these devices ideal for use with a simple bar or rod magnet.
The three basic devices (3121, 3122, and 3123) are identical except for
magnetic switch points.
CC
2
3
OUTPUT
SUPPLY
1
GROUND
V
Dwg. PH-003A
Each device includes a voltage regulator for operation with supply
voltages of 4.5 voltas to 24 volts, reverse battery protection diode,
quadratic Hall-voltage generator, temperature compensation circuitry,
small-signal amplifier, Schmitt trigger, and an open-collector output to
sink up to 25 mA. With suitable output pull up, they can be used with
bipolar or CMOS logic circuits. The 3121 is an improved replacement
for the 3113 and 3119.
The first character of the part number suffix determines the device
operating temperature range. Suffix ‘E–’ is for the automotive and
industrial temperature range of -40°C to +85°C. Suffix ‘L–’ is for the
automotive and military temperature range of -40°C to +150°C. Three
package styles provide a magnetically optimized package for most
applications. Suffix ‘–LT’ is a miniature SOT-89/TO-243AA transistor
package for surface-mount applications; suffix ‘–U’ is a three-lead
plastic mini-SIP while suffix ‘–UA’ is a three-lead ultra-mini-SIP.
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C
Supply Voltage, VCC ........................... 30 V
Reverse Battery Voltage, VRCC ........ -30 V
FEATURES and BENEFITS
■ Superior Temp. Stability for Automotive or Industrial Applications
■ 4.5 V to 24 V Operation … Needs Only An Unregulated Supply
Magnetic Flux Density, B ....... Unlimited
■ Open-Collector 25 mA Output … Compatible with Digital Logic
Output OFF Voltage, VOUT ................ 28 V
■ Reverse Battery Protection
Reverse Output Voltage, VOUT ........ -0.5 V
■ Activate with Small, Commercially Available Permanent Magnets
Continuous Output Current, IOUT ... 25 mA
■ Solid-State Reliability … No Moving Parts
Operating Temperature Range, TA
Suffix ‘E–’ ................. -40°C to +85°C
Suffix ‘L–’ ............... -40°C to +150°C
Storage Temperature Range,
TS .............................. -65°C to +170°C
■ Small Size
■ Resistant to Physical Stress
Always order by complete part number, e.g., A3121EU .
3121, 3122, AND 3123
HALL-EFFECT SWITCHES
FOR HIGH-TEMPERATURE
OPERATION
ELECTRICAL CHARACTERISTICS over operating temperature range, at VCC = 12 V.
Limits
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Supply Voltage
VCC
Operating
4.5
—
24
V
VOUT(SAT)
IOUT = 20 mA, B > BOP
—
140
400
mV
Output Leakage Current
IOFF
VOUT = 24 V, B < BRP
—
<1.0
10
µA
Supply Current
ICC
B < BRP (Output OFF)
—
4.6
9.0
mA
Output Rise Time
tr
RL = 820 Ω, CL = 20 pF
—
0.04
2.0
µs
Output Fall Time
tf
RL = 820 Ω, CL = 20 pF
—
0.18
2.0
µs
Output Saturation Voltage
MAGNETIC CHARACTERISTICS in gauss over operating supply voltage range.
Part Numbers*
A3121
Characteristic
BOP at TA = 25°C
over operating temp. range
BRP at TA = 25°C
over operating temp. range
Bhys at TA = 25°C
over operating temp. range
A3122
A3123
Min.
Typ.
Max.
Min.
Typ.
Max.
Min.
Typ.
Max
250
350
450
280
340
400
250
345
440
220
350
500
260
340
430
230
345
470
125
245
380
140
235
330
180
240
300
80
245
410
120
235
360
160
240
330
70
105
140
70
105
140
70
105
140
60
105
150
70
105
140
70
105
140
NOTES: Typical values are at TA = +25°C and VCC = 12 V.
BOP = operate point (output turns ON); BRP = release point (output turns OFF); Bhys = hysteresis (BOP - BRP).
*Complete part number includes a suffix to identify operating temperature range (E- or L-) and package type ( -LT, -U, or -UA).
FUNCTIONAL BLOCK DIAGRAM
1
VCC
REG.
X
3
OUTPUT
2
GROUND
Dwg. FH-005-2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1992, 1999, Allegro MicroSystems, Inc.
3121, 3122, AND 3123
HALL-EFFECT SWITCHES
FOR HIGH-TEMPERATURE
OPERATION
TYPICAL OPERATING CHARACTERISTICS
SWITCH POINTS
OUTPUT SATURATION VOLTAGE
0
400
I OUT = 20 mA
OPERATE POINT
V CC = 4.5–24 V
SWITCH POINT IN GAUSS
300
0
RELEASE POINT
200
0
V CC = 12 V
100
0
-50
0
-50
-25
0
25
50
100
75
125
150
-25
0
25
50
100
75
125
Dwg. GH-040
Dwg. GH-038
SUPPLY CURRENT
SUPPLY CURRENT
7.0
10
6.0
8.0
SUPPLY CURRENT IN mA
SUPPLY CURRENT IN mA
VCC = 12 V
B ≥ B OP
5.0
-25
0
25
50
75
100
B ≥ B OP
6.0
B ≤ B RP
4.0
T A = +25°C
2.0
B ≤ B RP
4.0
-50
150
AMBIENT TEMPERATURE IN °C
AMBIENT TEMPERATURE IN °C
125
150
AMBIENT TEMPERATURE IN °C
0
0
5
10
15
20
25
SUPPLY VOLTAGE IN VOLTS
Dwg. GH-039
* Complete part number includes a suffix denoting operating temperature range (E- or L-) and package type ( -LT, -U, or -UA).
Dwg. GH-041
3121, 3122, AND 3123
HALL-EFFECT SWITCHES
FOR HIGH-TEMPERATURE
OPERATION
OPERATION
SENSOR LOCATIONS
(±0.005" [0.13 mm] die placement)
Suffix “LT”
ACTIVE AREA DEPTH
0.030"
0.76 mm
NOM
0.089"
2.26 mm
0.043"
1.09 mm
The output of these devices (pin 3) switches low when the magnetic field at the Hall sensor exceeds the operate point threshold (BOP).
At this point, the output voltage is VOUT(SAT). When the magnetic field
is reduced to below the release point threshold (BRP), the device output
goes high. The difference in the magnetic operate and release points is
called the hysteresis (Bhys) of the device. This built-in hysteresis allows
clean switching of the output even in the presence of external mechanical vibration and electrical noise.
APPLICATIONS INFORMATION
A
1
2
Hall effect applications information is available in the “Hall-Effect
IC Applications Guide”, which can be found in the latest issue of
Allegro MicroSystems Data Book AMS-702.
3
Dwg. MH-008-2C
Suffix “U”
ACTIVE AREA DEPTH
0.016"
0.41 mm
NOM
CHANGE IN OPERATE POINT
0.091"
2.31 mm
0.070"
1.78 mm
A
BRANDED
SURFACE
1
2
3
Dwg. MH-002-2B
Suffix “UA”
ACTIVE AREA DEPTH
0.019"
0.48 mm
NOM
CHANGE IN OPERATE POINT IN GAUSS
20
15
T A = +25°C
10
5.0
0
-5.0
0.082"
2.07 mm
0
5
10
15
20
25
SUPPLY VOLTAGE IN VOLTS
Dwg. GH-042
0.055"
1.38 mm
A
BRANDED
SURFACE
1
2
3
Dwg. MH-011-2C
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
3121, 3122, AND 3123
HALL-EFFECT SWITCHES
FOR HIGH-TEMPERATURE
OPERATION
PACKAGE DESIGNATOR ‘LT’
Dimensions in Inches
(for reference only)
0.173
0.181
0.064
0.072
0.155
0.167
1
2
0.055
0.063
3
0.090
0.102
0.014
0.017
0.084
0.090
0.014
0.019
0.017
0.022
0.035
0.047
0.059
BSC
0.118
BSC
Dwg. MA-009-3 in
Dimensions in Millimeters
(controlling dimensions)
4.40
4.60
1.62
1.83
3.94
4.25
1
2
1.40
1.60
3
2.29
2.60
0.35
0.44
2.13
2.29
0.36
0.48
0.89
1.20
0.44
0.56
1.50
BSC
3.00
BSC
NOTE: Exact body and lead configuration at vendor's option within limits shown.
Dwg. MA-009-3 mm
3121, 3122, AND 3123
HALL-EFFECT SWITCHES
FOR HIGH-TEMPERATURE
OPERATION
PACKAGE DESIGNATOR ‘U’
Dimensions in Inches
(controlling dimensions)
Dimensions in Millimeters
(for reference only)
4.65
4.52
0.183
0.178
1.60
1.50
0.063
0.059
4.60
4.47
0.181
0.176
45°
45°
0.086
1
2
0.018
3
2.18
1
2
0.46
3
MAX
MAX
0.600
0.560
15.24
14.23
0.015
0.38
0.41
0.016
SEE NOTE
SEE NOTE
1.27
0.050
2.54
0.100
Dwg. MH-003D in
Devices in the ‘U’ package are
NOT RECOMMENDED FOR NEW DESIGN
NOTES: 1. Tolerances on package height and width represent allowable mold offsets.
Dimensions given are measured at the widest point (parting line).
2. Exact body and lead configuration at vendor’s option within limits shown.
3. Height does not include mold gate flash.
4. Recommended minimum PWB hole diameter to clear transition area is 0.035" (0.89 mm).
5. Where no tolerance is specified, dimension is nominal.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Dwg. MH-003D mm
3121, 3122, AND 3123
HALL-EFFECT SWITCHES
FOR HIGH-TEMPERATURE
OPERATION
PACKAGE DESIGNATOR ‘UA’
Dimensions in Inches
(controlling dimensions)
Dimensions in Millimeters
(for reference only)
0.164
0.159
4.17
4.04
0.062
0.058
45°
1.57
1.47
45°
0.122
0.117
3.10
2.97
45°
0.085
1
2
3
45°
0.031
2.16
MAX
1
2
3
0.79
MAX
0.640
0.600
16.26
15.24
0.015
SEE NOTE
SEE NOTE
0.016
0.050
BSC
0.38
0.41
1.27
Dwg. MH-014D in
NOTES: 1. Tolerances on package height and width represent allowable mold offsets.
Dimensions given are measured at the widest point (parting line).
2. Exact body and lead configuration at vendor’s option within limits shown.
3. Height does not include mold gate flash.
4. Recommended minimum PWB hole diameter to clear transition area is 0.035" (0.89 mm).
5. Where no tolerance is specified, dimension is nominal.
BSC
Dwg. MH-014D mm
3121, 3122, AND 3123
HALL-EFFECT SWITCHES
FOR HIGH-TEMPERATURE
OPERATION
The products described herein are manufactured under one or more
of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283;
5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719;
5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents
pending.
Allegro MicroSystems, Inc. reserves the right to make, from time to
time, such departures from the detail specifications as may be required
to permit improvements in the performance, reliability, or
manufacturability of its products. Before placing an order, the user is
cautioned to verify that the information being relied upon is current.
Allegro products are not authorized for use as critical components
in life-support appliances, devices, or systems without express written
approval.
The information included herein is believed to be accurate and
reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringements of patents or other rights of
third parties that may result from its use.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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