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 +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, 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 A3141– and A3142– are im-
proved 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 SOT89/TO-243AA transistor
package for surface-mount applications; suffix ‘–UA’ is a three-lead
ultra-mini-SIP.
Data Sheet
27621.6B*
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 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
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
Always order by complete part number, e.g.,
A3141ELT
.
3141
THRU
3144
SENSITIVE
HALL-EFFECT SWITCHES
FOR HIGH-TEMP. OPERATION
FUNCTIONAL BLOCK DIAGRAM
1
V
CC
REG.
X
3
OUTPUT
GROUND
2
Dwg. FH-005-2
ELECTRICAL CHARACTERISTICS at V
CC
= 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
V
CC
V
OUT(SAT)
I
OFF
I
CC
t
r
t
f
Test Conditions
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
Min.
4.5
—
—
—
—
—
Typ.
—
175
<1.0
4.4
0.04
0.18
Max.
24
400
10
9.0
2.0
2.0
Units
V
mV
µA
mA
µs
µs
MAGNETIC CHARACTERISTICS in gauss over operating supply voltage range.
Part Numbers*
A3141–
Characteristic
B
OP
at T
A
= 25°C
over operating temp. range
B
RP
at T
A
= 25°C
over operating temp. range
B
hys
at T
A
= 25°C
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
A3144–
Typ.
—
—
—
—
55
55
Max.
350
450
330
430
—
—
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
).
1 gauss (G) is exactly equal to 0.1 millitesla (mT).
*Complete part number includes a suffix to identify operating temperature range (E- or L-) and package type ( -LT or -UA).
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1993, 2002 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
V
CC
= 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
= +25°C
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
= +25°C
10
A
1
2
3
5.0
Dwg. MH-008-2D
0
Suffix “UA”
ACTIVE AREA DEPTH
0.0195"
0.50 mm
NOM
0.082"
2.07 mm
-5.0
0
5
10
15
20
25
SUPPLY VOLTAGE IN VOLTS
Dwg. GH-042-1
Allegro
A
BRANDED
SURFACE
1
2
3
0.055"
1.39 mm
OPERATION
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.
Dwg. MH-011-10A
Extensive applications information for Hall-effect sensors is available in:
•
Hall-Effect IC Applications Guide,
Application Note 27701;
•
Hall-Effect Devices: Soldering, Gluing, Potting, Encapsulating, and Lead
Forming,
Application Note 27703.1;
•
Soldering of Through-Hole Hall-Sensor Dervices,
Application Note 27703;
and
•
Soldering of Surface-Mount Hall-Sensor Devices,
Application Note 27703.2.
All are provided in
Allegro Electronic Data Book,
AMS-702. or at
www.allegromicro.com
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’
(SOT89/TO-243AA)
Dimensions in Inches
(for reference only)
Dimensions in Millimeters
(controlling dimensions)
0.181
0.173
0.072
0.064
0.167
0.155
0.102
0.090
0.063
0.055
0.0173
0.0138
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
0.090
0.084
1
2
3
2.29
2.13
0.047
0.035
0.059
BSC
0.0189
0.0142
0.0221
0.0173
0.118
BSC
Dwg. MA-009-3A in
1.20
0.89
1.50
BSC
0.48
0.36
0.56
0.44
3.00
BSC
Dwg. MA-009-3A mm
0.098
0.079
B
A
0.031
0.102
0.181
3 0.047
0.031
TYP
2.5
2.0
B
A
0.8
2.6
4.6
1.2
0.8
TYP
1
0.028
TYP
2
1
0.7
TYP
2
3
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
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 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.
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