A3161 Datasheet

A3161
Hall-Effect Switch for 2-Wire Applications
Discontinued Product
These parts are no longer in production The device should not be
purchased for new design applications. Samples are no longer available.
Date of status change: May 7, 2013
Recommended Substitutions:
For existing customer transition, and for new customers or new applications, refer to the A1150.
NOTE: For detailed information on purchasing options, contact your
local Allegro field applications engineer or sales representative.
Allegro MicroSystems, LLC reserves the right to make, from time to time, revisions to the anticipated product life cycle plan
for a product to accommodate changes in production capabilities, alternative product availabilities, or market demand. The
information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, LLC assumes no responsibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use.
Data Sheet
27621.30B
3161
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
X
This Hall-effect switch is a monolithic integrated circuit designed to
operate continuously over extended temperatures to +85°C. The unipolar switching characteristic makes this device ideal for use with a simple
bar or rod magnet. The A3161ELT and A3161EUA are identical except
for package.
2
3
Two 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 ‘UA’ is a threelead ultra-mini SIP for through-hole mounting.
OUTPUT
1
GROUND
CC
SUPPLY
V
Each device includes a voltage regulator for operation with supply
voltages of 3.5 to 25 volts, reverse battery protection diode, quadratic
Hall-voltage generator, temperature compensation circuitry, small-signal
amplifier, Schmitt trigger, and a constant-current open-collector output.
Noise radiation is limited by control of the output current slew rate.
Dwg. PH-003-3
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C
Supply Voltage, VCC
Continuous ................................. 28 V
Surge (tw ≤ 100 ms) .................... 40 V
Reverse Battery Voltage, VRCC
Continuous ................................ -25 V
Surge (tw ≤ 100 ms) ................... -40 V
FEATURES and BENEFITS
■
■
■
■
■
■
■
■
■
Internal Current Regulator for 2-Wire Operation
Output Slew Rate Controlled
3.5 V to 25 V Operation … Needs Only An Unregulated Supply
Reverse Battery Protection
Excellent Temp. Stability
Activate with Small, Commercially Available Permanent Magnets
Small Size
Solid-State Reliability … No Moving Parts
Resistant to Physical Stress
Magnetic Flux Density, B ....... Unlimited
Output OFF Voltage, VOUT .............. 28 V
Operating Temperature Range,
TA ............................. -40°C to +85°C
Storage Temperature Range,
TS ........................... -65°C to +170°C
Always order by complete part number, e.g., A3161ELT .
3161
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
ELECTRICAL CHARACTERISTICS over operating voltage and temperature ranges.
Limits
Characteristic
Symbol
Supply Voltage
VCC
Min.
Typ.
Max.
Units
Operating
3.5
—
25
V
3.5 V ≤ VOUT < 12 V, B < BRP
12
15
17
mA
VOUT ≥ 12 V, B < BRP
12
15
19
mA
B > BOP
—
3.5
5.0
mA
IOUT
B < BRP
—
12
—
mA
IOFF
VOUT = 24 V, B > BOP
—
<1.0
10
µA
Output Saturation Voltage
VOUT
IOUT = 5 mA, B < BRP
–
0.9
1.5
V
Output Slew Rate
di/dt
CL = 20 pF
—
7.0
20
mA/µs
tsd
CL = 20 pF
—
—
20
µs
Load Current
(2-wire application)
Test Conditions
IOUT + ICC
Output Current
Output Settling Time
MAGNETIC CHARACTERISTICS over operating supply voltage range.
Limits
At TA = +25°C
Characteristic
Over Oper. Temp. Range
Symbol
Min.
Typ.
Max.
Min.
Typ.
Max.
Units
Operate Point (output turns OFF)
BOP
–
130
160
–
130
160
G
Release Point (output turns ON)
BRP
30
110
–
30
110
–
G
Hysteresis (BOP - BRP)
Bhys
5.0
20
–
5.0
20
80
G
NOTE:Typical values are at TA = +25°C and VCC = 12 V.
FUNCTIONAL BLOCK DIAGRAM
1
VCC
3
OUTPUT
REG.
X
2
GROUND
Dwg. FH-017
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1998, 2002 Allegro MicroSystems, Inc.
3161
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
TYPICAL OPERATING CHARACTERISTICS
SWITCH POINTS
TOTAL SUPPLY CURRENT
20
+ I CC ) in mA
200
TOTAL SUPPLY CURRENT (I
OPERATE POINT
RELEASE POINT
100
50
OVER OPER. VOLT. RANGE
-25
0
B < BRP
VCC = 3.5 V
25
50
75
100
125
10
5.0
VCC = 25 V
150
B > BOP
VCC = 3.5 V
0
-50
0
-50
VCC = 25 V
15
OUT
SWITCH POINT in GAUSS
150
-25
0
25
50
75
100
125
150
AMBIENT TEMPERATURE in °C
AMBIENT TEMPERATURE in °C
Dwg. GH-044-1
Dwg. GH-028-4
OUTPUT SATURATION VOLTAGE
SAFE OPERATING AREA
30
SATURATION VOLTAGE in mV
1000
800
600
400
IOUT = 5 mA
200
VCC = 10 V
0
-50
-25
0
25
50
75
100
125
150
AMBIENT TEMPERATURE in °C
25
20
PACKAGE SUFFIX
CODE -UA
15
PACKAGE SUFFIX
CODE -LT
10
5
0
20
40
60
80
100
120
140
160
180
AMBIENT TEMPERATURE in °C
Dwg. GH-029-3
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MAXIMUM CONTINUOUS SUPPLY VOLTAGE in VOLTS
1200
Dwg. GH-068
3161
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
ELEMENT LOCATIONS
OPERATION
The output of these devices (pin 3) switches OFF when the magnetic
field at the Hall element exceeds the operate point threshold (B
OP). When the
magnetic field is reduced to below the release point threshold (BRP), the
device output switches ON. 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.
Suffix “LT”
ACTIVE AREA DEPTH
0.0305"
0.775 mm
NOM
0.085"
2.16 mm
0.045"
1.14 mm
A
15
1
2
3
12
OUTPUT CURRENT in mA
BOP
Dwg. MH-008-7A
Suffix “UA”
ACTIVE AREA DEPTH
0.0195"
0.50 mm
NOM
0.078"
1.98 mm
9.0
6.0
TA = +25°C
3.0
BRP
0.054"
1.36 mm
A
BRANDED
SURFACE
1
2
0
0
25
50
75
100
125
150
175
200
MAGNETIC FLUX DENSITY in GAUSS
3
Dwg. GH-007-1
APPLICATIONS INFORMATION
These devices are normally operated in a 2-wire mode, where the supply
terminal and the output terminal are tied together. An external comparator
detects the change in total supply current by the addition (output off, B > BOP)
or subtraction (output on, B < BRP) of IOUT.
Hall effect applications information is available in the “Hall-Effect IC
Applications Guide”, which can be found in the latest issue of the Allegro
MicroSystems Electronic Data Book, AMS-702 or Application Note 27701,
www.allegromicro.com.
or at
Dwg. MH-011-8A
Allegro
TYPICAL 2-WIRE APPLICATION
CC
0.85 V
–
2
V
0.1 µF
+
1
3
SUPPLY
Icc + IoUT
100 Ω
Dwg. EH-011A
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
X
3161
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
PACKAGE DESIGNATOR ‘LT’
(SOT89/TO-243AA)
Dimensions in Inches
(for reference only)
0.181
0.173
0.072
0.064
0.167
0.155
1
2
0.063
0.055
0.102
0.090
3
Dimensions in Millimeters
(controlling dimensions)
0.0173
0.0138
0.090
0.084
4.25
3.94
0.0189
0.0142
0.0221
0.0173
0.047
0.035
0.059
4.60
4.40
1.83
1.62
3.00
BSC
Dwg. MA-009-3A in
Dwg. MA-009-3A mm
2.5
2.0
0.098
0.079
B
B
0.031
0.102
A
0.8
2.6
A
4.6
0.181
1
2
2.29
2.13
0.56
0.44
1.50
0.118
BSC
2.60
2.29
3
0.44
0.35
0.48
0.36
1.20
0.89
BSC
BSC
2
1
1.60
1.40
3 0.047
1
2
3
1.2
0.028
0.031
0.7
0.8
TYP
TYP
TYP
TYP
Pads 1, 2, 3, and A — Standard SOT89 Layout
Pads 1, 2, 3, and B — Low-Stress Version
Pads 1, 2, and 3 only — Lowest Stress, But Not Self Aligning
Pads 1, 2, 3, and A — Standard SOT89 Layout
Pads 1, 2, 3, and B — Low-Stress Version
Pads 1, 2, and 3 only — Lowest Stress, But Not Self Aligning
Dwg. MA-012-3 in
Dwg. MA-012-3 mm
NOTES: 1. Exact body and lead configuration at vendor’s option within limits shown.
2. Supplied in bulk pack (500 pieces per bag) or add "TR" to part number for tape and reel.
3. Only low-temperature (≤240°C) reflow-soldering techniques are recommended for SOT89 devices.
www.allegromicro.com
3161
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
PACKAGE DESIGNATOR ‘UA’
Dimensions in Millimeters
(for reference only)
Dimensions in Inches
(controlling dimensions)
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°
45°
0.085
1
2
3
0.031
2.16
1
2
0.79
3
MAX
MAX
0.640
0.600
16.26
15.24
0.0173
0.0138
0.0189
0.0142
SEE NOTE
0.44
0.35
0.48
0.36
SEE NOTE
1.27
0.050
BSC
BSC
Dwg. MH-014E in
Dwg. MH-014E mm
Radial Lead Form (order A3161EUA-LC)
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.
6. Supplied in bulk pack (500 pieces per bag).
1
2
3
0.108"
(2.74 mm)
0.620"
0.500"
(15.7 mm
12.7 mm)
0.100"
(2.5 mm)
Dwg. MH-026
NOTE: Lead-form dimensions are the nominals produced on the
forming equipment. No dimensional tolerance is implied or
guaranteed for bulk packaging (500 pieces per bag).
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
3161
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
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.
www.allegromicro.com
3161
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
HALL-EFFECT SENSOR ICS
UNIPOLAR HALL-EFFECT DIGITAL SWITCHES
Partial
Part
Number
A3121x
A3122x
A3123x
A3141x
A3142x
A3143x
A3144x
A3161E
A3240x
Operate
Release
Hysteresis
Point (G)
Point (G)
(G)
Over Oper. Voltage & Temp. Range
220 to 500
80 to 410
260 to 430
120 to 360
230 to 470
160 to 330
30 to 175
10 to 145
115 to 245
60 to 190
205 to 355
150 to 300
35 to 450
25 to 430
<160 (Typ 130) >30 (Typ 110)
<50 (Typ 35)
>5 (Typ 25)
Oper.
Temp.
Packages
60 to 150
70 to 140
70 to 140
20 to 80
30 to 80
30 to 80
>20
5 to 80
Typ 10
E, L
E, L
E, L
E, L
E, L
E, L
E, L
E
E, L
LT, UA
LT, UA
LT, UA
LT, UA
LT, UA
LT, UA
LT, UA
LT, UA
LH, LT, UA
A3361E
<125
>40
5 to 30
E
LH, LT, UA
A3362E
<125
>40
5 to 30
E
LH, LT, UA
Replaces
and
Comments
3019, 3113, 3119
3040, 3140
3020, 3120
2-wire operation
chopper stabilized
2-wire, chopper stabilized,
output normally high
2-wire, chopper stabilized,
output normally low
Notes: 1) Typical data is at TA = +25°C and nominal operating voltage.
2) “x” = Operating Temperature Range [suffix letter or (prefix)]: S (UGN) = -20°C to +85°C, E = -40°C to +85°C,
J = -40°C to +115°C, K (UGS) = -40°C to +125°C, L (UGL) = -40°C to +150°C.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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