3141
THRU
3144
V
CC
1 2 3
Dwg. PH-003A
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 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 -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 T
A
= +25
C
Supply Voltage, V
CC
............................
28 V
Reverse Battery Voltage, V
RCC
........... -35 V
Magnetic Flux Density, B .......... Unlimited
Output OFF Voltage, V
OUT
.................. 28 V
Reverse Output Voltage, V
OUT
...........
-0.5 V
Continuous Output Current, I
OUT
...... 25 mA
Operating Temperature Range, T
A
Suffix ‘E–’ .................. -40
°
C to +85
°
C
Suffix ‘L–’ ................ -40
°
C to +150
°
C
Storage Temperature Range,
T
S
.............................. -65
°
C to +170
°
C
■
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
Always order by complete part number, e.g., A3141ELT .

3141
THRU
3144
SENSITIVE
HALL-EFFECT SWITCHES
FOR HIGH-TEMP. OPERATION
1 V
CC
REG.
X 3 OUTPUT
2 GROUND
Dwg. FH-005-2
CC
Limits
Characteristic Symbol Test Conditions Min.
Typ.
Max.
Supply Voltage
Output Saturation Voltage
Output Leakage Current
Supply Current
Output Rise Time
Output Fall Time
V
CC
V
OUT(SAT)
I
OFF
I
CC t r t f
Operating
I
OUT
= 20 mA, B > B
OP
V
OUT
= 24 V, B < B
RP
B < B
RP
(Output OFF)
R
L
= 820 Ω , C
L
= 20 pF
R
L
= 820 Ω , C
L
= 20 pF
4.5
—
—
—
—
—
Units
— 24 V
175
0.04
0.18
400
2.0
2.0
mV
<1.010
µ A
4.4
9.0mA
µ s
µ s
Characteristic
B
OP at T
A
= 25 ° C
B
RP over operating temp. range at T
A
= 25 ° C over operating temp. range
B hys at T
A
= 25 ° C over operating temp. range
A3141– A3142–
Part Numbers*
A3143– A3144–
Min.
Typ.
Max.
Min.
Typ.
Max.
Min.
Typ.
Max.
Min.
Typ.
Max.
5010 70 — 350
115 180245
1045 130 75 125 175
20
165
280355
225 285
35 — 450
50— 330
1045 145
2055 80
60
3055
190 150
80 3055
30 —
80 2055
430
—
2055 80 3055 80 3055 80 2055 —
NOTES: Typical values are at T
A
= +25
°
C and V
CC
= 8 V.
B
OP
= operate point (output turns ON); B
RP
= release point (output turns OFF); B hys
= hysteresis (B
OP
- B
RP
).
*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 © 1993, 1999, Allegro MicroSystems, Inc.

400
300
200
3141
THRU
3144
SENSITIVE
HALL-EFFECT SWITCHES
FOR HIGH-TEMP. OPERATION
A3142– SWITCH POINTS OUTPUT SATURATION VOLTAGE
300
V = 8 V
CC
200
OPERATE POINT
100
RELEASE POINT
100
10
0
-50 -25 0 25 50 75
AMBIENT TEMPERATURE IN ° C
100 125 150
Dwg. GH-044
SUPPLY CURRENT
0
-50 -25 0 25 50 75
AMBIENT TEMPERATURE IN ° C
100 125 150
Dwg. GH-040-1
SUPPLY CURRENT
7.0
8.0
B ≥ B
6.0
B ≥ B
6.0
4.0
B ≤ B
RP
5.0
2.0
0
0
T = +25 ° C
5 10 15
SUPPLY VOLTAGE IN VOLTS
20 25
Dwg. GH-041-1
B ≤ B
RP
4.0
-50 -25 0 25 50 75
AMBIENT TEMPERATURE IN
°
C
100 125 150
Dwg. GH-039-1
* Complete part number includes a suffix denoting operating temperature range (E- or L-) and package type ( -LT, -U, or -UA).

3141
THRU
3144
SENSITIVE
HALL-EFFECT SWITCHES
FOR HIGH-TEMP. OPERATION
(
±
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
A
1 2 3
Dwg. MH-008-2C
Suffix “U”
ACTIVE AREA DEPTH
0.016"
0.41 mm
NOM
0.091"
2.31 mm
0.070"
1.78 mm
A
BRANDED
SURFACE 1 2 3
Suffix “UA”
ACTIVE AREA DEPTH
0.019"
0.48 mm
NOM
0.082"
2.07 mm
Dwg. MH-002-2B
CHANGE IN OPERATE POINT
20
15
10
T = +25
°
C
5.0
0
-5.0
0 5 10 15
SUPPLY VOLTAGE IN VOLTS
20 25
Dwg. GH-042-1
The output of these devices (pin 3) switches low when the magnetic field at the Hall sensor exceeds the operate point threshold (B
OP
). At this point, the output voltage is V
OUT(SAT)
. When the magnetic field is reduced to below the release point threshold (B
RP
), the device output goes high. The difference in the magnetic operate and release points is called the hysteresis (B hys
) of the device. This built-in hysteresis allows clean switching of the output even in the presence of external mechanical vibration and electrical noise.
A
BRANDED
SURFACE 1 2 3
0.055"
1.39 mm
Dwg. MH-011-10
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000

3141
THRU
3144
SENSITIVE
HALL-EFFECT SWITCHES
FOR HIGH-TEMP. OPERATION
0.155
0.167
(SOT-89/TO-243AA)
Dimensions in Inches
(for reference only)
1
0.173
0.181
0.064
0.072
2 3
0.090
0.102
0.055
0.063
0.084
0.090
0.035
0.047
0.059
BSC
0.118
BSC
0.014
0.017
0.019
0.022
0.014
0.017
Dwg. MA-009-3 in
3.94
4.25
Dimensions in Millimeters
(controlling dimensions)
1
4.40
4.60
1.62
1.83
2 3
2.29
2.60
1.40
1.60
2.13
2.29
0.35
0.44
0.89
1.20
1.50
BSC
3.00
BSC
0.44
0.56
0.36
0.48
Dwg. MA-009-3 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.

3141
THRU
3144
SENSITIVE
HALL-EFFECT SWITCHES
FOR HIGH-TEMP. OPERATION
Dimensions in Inches
(controlling dimensions)
0.183
0.178
Dimensions in Millimeters
(for reference only)
4.65
4.52
0.063
0.059
1.60
1.50
0.181
0.176
0.086
MAX
1
0.600
0.560
2 3
SEE NOTE
0.016
0.050
0.100
45
°
0.018
0.015
Dwg. MH-003D in
4.60
4.47
15.24
14.23
2.18
MAX
1 2 3
SEE NOTE
0.41
2.54
1.27
45 °
0.46
0.38
Dwg. MH-003D 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.
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
Dimensions in Inches
(controlling dimensions)
Dimensions in Millimeters
(for reference only)
45 °
0.164
0.159
0.062
0.058
SEE NOTE
0.122
0.117
0.085
MAX
1
0.640
0.600
2 3
0.031
0.016
0.050
BSC
Dwg. MH-014D in
45
0.015
°
4.17
4.04
45
°
1.57
1.47
SEE NOTE
3.10
2.97
16.26
15.24
2.16
MAX
1 2 3
0.79
0.41
1.27
BSC
0.38
45
Dwg. MH-014D 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.
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.

3141
THRU
3144
SENSITIVE
HALL-EFFECT SWITCHES
FOR HIGH-TEMP. OPERATION
Partial Part Avail. Oper.
Number Temp.
3240E/L
3210E
3361
3362
3161
3141
3235
E
E
E
E/L
S
5140
3142
3143
3144
3122
3123
3121
3150J
E/L
E/L
E
E/L
E/L
E/L
E/L
Characteristics at TA = +25
°
C
BOP(max) BRP(min) Bhys(typ)
HALL-EFFECT UNIPOLAR SWITCHES in order of BOP and Bhys
+50+5.010chopper stabilized
± 70 ± 5.07.7
* micropower, chopper stabilized
2-wire, chopper stabilized
2-wire, chopper stabilized
+160+30 20 2-wire
+160+10 55
+175 +25 15*
-25
+200
-175
+50
15*
55 output 1 output 2
300 mA output
+230+75
+340+165
55
55
+350+50 55
+400 +140 105
+450+125
Features
20programmable, chopper stabilized
3185
HALL-EFFECT LATCHES & BIPOLAR SWITCHES
†
in order of BOP and Bhys
3625
3626
3195
3197
3175
3188
3283
3189
3275
3260E/L
3280E/L
3134
3133
E/L
K/L/S
3281
3132
3187
3177
E/L
K/L/S
E/L
S
S
S
E/L
L
S
E/L
E/L
E/L
S
E/L
+30-30 20bipolar, chopper stabilized
+40-40 45 chopper stabilized
+50-50 27
+75 -75 52 bipolar switch bipolar switch
+95
+150
+150
+150
+180
+230
+250
-95
-150
-150
-150
-180
-230
-250
52
100*
200
200
+160-160 220
+160-160 230
200*
100*
100* bipolar switch
900 mA outputs
400 mA outputs
Notes
1
2
2
1, 3
1
1, 3, 5
1, 3, 5
1, 4
1
5
Operating Temperature Ranges:
S = -20
°
C to +85
°
C, E = -40
°
C to +85
°
C, J = -40
°
C to +115
°
C, K = -40
°
C to +125
°
C, L = -40
°
C to +150
°
C
Notes 1. Protected.
2. Output 1 switches on south pole, output 2 switches on north pole for 2-phase, bifilar-wound, unipolar-driven brushless dc motor control.
3. Power driver output.
4. Active pull down.
5. Complementary outputs for 2-phase bifilar-wound, unipolar-driven brushless dc motor control.
* Minimum.
† Latches will not switch on removal of magnetic field; bipolar switches may switch on removal of field but require field reversal for reliable operation over operating temperature range.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000