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3141 THRU 3144
SENSITIVE HALL-EFFECT SWITCHES FOR HIGH-TEMPERATURE OPERATION
These Hall-effect switches are monolithic integrated circuits with tighter magnetic specifications, designed to operate continuously over extended temperatures to +150C, 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 four basic devices (3141, 3142, 3143, and 3144) are identical except for magnetic switch points. Each device includes a voltage regulator for operation with supply voltages of 4.5 to 24 volts, reverse battery protection diode, quadratic Hall-voltage generator, temperature compensation circuitry, smallsignal 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 A3141- and A3142- are improved replacements for the UGN/UGS3140-; the A3144- is the improved replacement for the UGN/UGS3120-. 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 -40C to +85C. Suffix `L-' is for the automotive and military temperature range of -40C to +150C. 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.
Data Sheet 27621.6A*
V
X
CC
1
2
3
GROUND
Dwg. PH-003A
Pinning is shown viewed from branded side.
OUTPUT
SUPPLY
FEATURES and BENEFITS
ABSOLUTE MAXIMUM RATINGS at TA = +25C
Supply Voltage, VCC ............................ 28 V Reverse Battery Voltage, VRCC ........... -35 V Magnetic Flux Density, B .......... Unlimited Output OFF Voltage, VOUT .................. 28 V Reverse Output Voltage, VOUT ........... -0.5 V Continuous Output Current, IOUT ...... 25 mA Operating Temperature Range, TA Suffix `E-' .................. -40C to +85C Suffix `L-' ................ -40C to +150C Storage Temperature Range, TS .............................. -65C to +170C
s s s s s s s s
Superior Temp. Stability for Automotive or Industrial Applications 4.5 V to 24 V Operation ... Needs Only An Unregulated Supply Open-Collector 25 mA Output ... Compatible with Digital Logic Reverse Battery Protection Activate with Small, Commercially Available Permanent Magnets Solid-State Reliability Small Size Resistant to Physical Stress
The A3141xU, A3142xU, A3143xU, and A3144xU are not for new design.
Always order by complete part number, e.g., A3141ELT .
3141 THRU 3144 SENSITIVE HALL-EFFECT SWITCHES FOR HIGH-TEMP. OPERATION
FUNCTIONAL BLOCK DIAGRAM
1
VCC
REG.
X
3
OUTPUT GROUND
2
Dwg. FH-005-2
ELECTRICAL CHARACTERISTICS at VCC = 8 V over operating temperature range.
Limits Characteristic Supply Voltage Output Saturation Voltage Output Leakage Current Supply Current Output Rise Time Output Fall Time Symbol VCC VOUT(SAT) IOFF ICC tr tf Test Conditions Operating IOUT = 20 mA, B > BOP VOUT = 24 V, B < BRP B < BRP (Output OFF) RL = 820 , CL = 20 pF RL = 820 , CL = 20 pF Min. 4.5 175 <1.0 4.4 0.04 0.18 Typ. Max. 24 400 10 9.0 2.0 2.0 Units V mV A mA s s
MAGNETIC CHARACTERISTICS in gauss over operating supply voltage range.
Part Numbers* A3141- Characteristic BOP at TA = 25C over operating temp. range BRP at TA = 25C over operating temp. range Bhys at TA = 25C over operating temp. range Min. 50 30 10 10 20 20 Typ. 100 100 45 45 55 55 Max. 160 175 130 145 80 80 A3142- Min. Typ. 130 115 75 60 30 30 180 180 125 125 55 55 Max. 230 245 175 190 80 80 Min. 220 205 165 150 30 30 A3143- Typ. 280 280 225 225 55 55 Max. 340 355 285 300 80 80 Min. 70 35 50 25 20 20 55 55 A3144- Typ. Max. 350 450 330 430
NOTES: Typical values are at TA = +25C and VCC = 8 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).
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 1993, 1999, Allegro MicroSystems, Inc.
3141 THRU 3144 SENSITIVE HALL-EFFECT SWITCHES FOR HIGH-TEMP. OPERATION
TYPICAL OPERATING CHARACTERISTICS
A3142- SWITCH POINTS
400
300
OUTPUT SATURATION VOLTAGE
I OUT = 20 mA
V 300
CC
=8V
V CC = 4.5-24 V
SATURATION VOLTAGE IN mV
SWITCH POINT IN GAUSS
200
200
OPERATE POINT
100
RELEASE POINT 100
0 -50 -25 0 25 50 75 100 125 150
0 -50
-25
0
25
50
75
100
125
150
AMBIENT TEMPERATURE IN C
Dwg. GH-044
AMBIENT TEMPERATURE IN C
Dwg. GH-040-1
SUPPLY CURRENT
10
7.0
SUPPLY CURRENT
8.0
B B OP
VCC = 8 V
SUPPLY CURRENT IN mA
SUPPLY CURRENT IN mA
B B OP 6.0
6.0
4.0
B B RP
5.0
2.0
T A = +25C
4.0
B B RP
0 0 5 10 15 20 25
-50 -25 0 25 50 75 100 125 150
SUPPLY VOLTAGE IN VOLTS
Dwg. GH-041-1
AMBIENT TEMPERATURE IN C
Dwg. GH-039-1
* Complete part number includes a suffix denoting operating temperature range (E- or L-) and package type ( -LT, -U, or -UA).
www.allegromicro.com
3141 THRU 3144 SENSITIVE HALL-EFFECT SWITCHES FOR HIGH-TEMP. OPERATION
SENSOR LOCATIONS
(0.005" [0.13 mm] die placement)
TYPICAL OPERATING CHARACTERISTICS (cont.)
CHANGE IN OPERATE POINT
20
Suffix "LT"
ACTIVE AREA DEPTH 0.0305" 0.775 mm NOM 0.089" 2.26 mm
CHANGE IN OPERATE POINT IN GAUSS
0.043" 1.09 mm
15 T A = +25C 10
A
1 2 3
5.0
Dwg. MH-008-2D
Suffix "U"
ACTIVE AREA DEPTH 0.0165" 0.42 mm NOM 0.091" 2.31 mm
0
-5.0 0 5 10 15 20 25
SUPPLY VOLTAGE IN VOLTS
0.070" 1.78 mm
Dwg. GH-042-1
A
BRANDED SURFACE 1 2 3
OPERATION
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.
Dwg. MH-002-2C
Suffix "UA"
ACTIVE AREA DEPTH 0.0195" 0.50 mm NOM 0.082" 2.07 mm
A
BRANDED SURFACE 1 2 3
0.055" 1.39 mm
Dwg. MH-011-10A
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3141 THRU 3144 SENSITIVE HALL-EFFECT SWITCHES FOR HIGH-TEMP. OPERATION
PACKAGE DESIGNATOR `LT'
(SOT-89/TO-243AA)
Dimensions in Inches (for reference only)
0.181 0.173 0.072 0.064 0.167 0.155 0.102 0.090
0.063 0.055
0.0173 0.0138
1
2
3
0.090 0.084
0.047 0.035 0.059
BSC
0.0189 0.0142 0.0221 0.0173 0.118
BSC
Dwg. MA-009-3A in
Dimensions in Millimeters (controlling dimensions)
4.60 4.40 1.83 1.62 4.25 3.94 2.60 2.29
1.60 1.40
0.44 0.35
1
2
3
2.29 2.13
1.20 0.89 1.50
BSC
0.48 0.36 0.56 0.44 3.00
BSC
Dwg. MA-009-3A mm
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.
www.allegromicro.com
3141 THRU 3144 SENSITIVE HALL-EFFECT SWITCHES FOR HIGH-TEMP. OPERATION
PACKAGE DESIGNATOR `U'
Dimensions in Inches (controlling dimensions)
0.183 0.178 0.063 0.059
Dimensions in Millimeters (for reference only)
4.65 4.52 1.60 1.50
0.181 0.176 45 0.086
MAX
4.60 4.47 45 2.18
MAX
1
2
3
0.018
1
2
3
0.46
0.600 0.560 0.0189 0.0142
SEE NOTE
0.0173 0.0138
15.24 14.23 0.48 0.36
SEE NOTE
0.44 0.35
0.050 0.100
Dwg. MH-003E in
1.27 2.54
Dwg. MH-003E mm
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).
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3141 THRU 3144 SENSITIVE HALL-EFFECT SWITCHES FOR HIGH-TEMP. OPERATION
PACKAGE DESIGNATOR `UA'
Dimensions in Inches (controlling dimensions) Dimensions in Millimeters (for reference only)
0.164 0.159
4.17 4.04
45
0.062 0.058
45
1.57 1.47
0.122 0.117 45 0.031
3.10 2.97 45 0.79
0.085
MAX
1
2
3
2.16
MAX
1
2
3
0.640 0.600
0.0173 0.0138
16.26 15.24
0.44 0.35
SEE NOTE
0.0189 0.0142
SEE NOTE
0.48 0.36
0.050
BSC
Dwg. MH-014E in
1.27
BSC
Dwg. MH-014E mm
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.
www.allegromicro.com
3141 THRU 3144 SENSITIVE HALL-EFFECT SWITCHES FOR HIGH-TEMP. OPERATION
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 design of its products. 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 which may result from its use.
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

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