3132
AND
3133
ULTRA-SENSITIVE BIPOLAR
HALL-EFFECT SWITCHES
These Hall-effect switches are designed for magnetic actuation using
a bipolar magnetic field, i.e., a north-south alternating field. They
combine extreme magnetic sensitivity with excellent stability over
varying temperature and supply voltage. The high sensitivity permits
their use with multi-pole ring magnets over relatively large distances.
Each device includes a voltage regulator, quadratic Hall voltage
generator, temperature stability circuit, signal amplifier, Schmitt trigger,
and open-collector output on a single silicon chip. The on-board regula-
tor permits operation with supply voltages of 4.5 to 24 V. The switch
output can sink up to 25 mA. With suitable output pull up, they can be
used directly with bipolar or MOS logic circuits.
Data Sheet
27631.2C
V
X
CC
1
2
3
GROUND
OUTPUT
SUPPLY
The three package styles available provide a magnetically optimized
package for most applications. Suffix ‘LT’ is a miniature SOT89/TO-
243AA transistor package for surface-mount applications; suffix ‘UA’
features wire leads for through-hole mounting. Prefix ‘UGN’ devices
are rated for continuous operation over the temperature range of -20°C to
+85°C, prefix ‘UGS’ devices over an extended range of -40°C to
+125°C, and prefix ‘UGL’ devices over the range of -40°C to +150°C.
FEATURES
s
4.5 V to 24 V Operation
s
Reverse Battery Protection
s
Superior Temperature Stability
s
Superior Supply Voltage Stability
Dwg. PH-003A
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
CC
. . . . . . . . . . . . .
25 V
Reverse Battery Voltage, V
RCC
. . . .
-35 V
Magnetic Flux Density, B . . . .
Unlimited
Output OFF Voltage, V
OUT
. . . . . . . .
25 V
Continuous Output Current, I
OUT
.
25 mA
Operating Temperature Range, T
A
Prefix UGL . . . . . . .
-40
°
C to +150
°
C
Prefix UGN . . . . . . . .
-20
°
C to +85
°
C
Prefix UGS . . . . . . .
-40
°
C to +125
°
C
Storage Temperature Range,
T
S
. . . . . . . . . . . . . . .
-65
°
C to +150
°
C
s
Activate with Multi-Pole Ring Magnets
s
Solid-State Reliability
s
Small Size
s
Constant Output Amplitude
s
Resistant to Physical Stress
Always order by complete part number
including prefix and suffix, e.g.,
UGN3132LT .
3132
AND
3133
BIPOLAR
HALL-EFFECT SWITCHES
FUNCTIONAL BLOCK DIAGRAM
1
V
CC
REG.
X
3
OUTPUT
GROUND
2
Dwg. FH-005-2
ELECTRICAL CHARACTERISTICS at T
A
= +25
°
C
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
V
CC
= 24 V, B
≤
B
RP
V
CC
= 12 V, R
L
= 820
Ω,
C
L
= 20 pF
V
CC
= 12 V, R
L
= 820
Ω,
C
L
= 20 pF
Min.
4.5
—
—
—
—
—
Typ.
—
145
<1.0
4.3
0.04
0.18
Max.
24
400
10
9.0
2.0
2.0
Units
V
mV
µA
mA
µs
µs
MAGNETIC CHARACTERISTICS over operating temperature and voltage range.
Limits
Characteristic
Operate Point
Symbol
B
OP
Device Type*
3132
3133
Release Point
B
RP
3132
3133
Hysteresis
B
hys
Both
Min.
—
—
-95
-75
30
Typ.
32
32
-20
-20
52
Max.
95
75
—
—
—
Units
G
G
G
G
G
NOTE: As used here, negative flux densities are defined as less than zero (algebraic convention.)
Typical values are at T
A
= +25°C and V
CC
= 12 V.
1 gauss (G) is exactly equal to 0.1 millitesla (mT).
*
Complete part number includes a prefix denoting operating temperature range (UGL, UGN, or UGS)
and a suffix denoting package type (LT or UA).
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1996, 2003 Allegro MicroSystems, Inc.
3132
AND
3133
BIPOLAR
HALL-EFFECT SWITCHES
TYPICAL CHARACTERISTICS
40
40
OPERATE POINT
20
OPERATE POINT
20
SWITCH POINT IN GAUSS
0
V
CC
= 12 V
I
OUT
= 20 mA
SWITCH POINT IN GAUSS
0
T
A
= 25°C
I
OUT
= 20 mA
RELEASE POINT
-20
-20
RELEASE POINT
-40
-50
-25
0
25
50
75
100
125
-40
4.0
8.0
12
16
20
24
28
Dwg. GH-021
AMBIENT TEMPERATURE IN
°
C
Dwg. GH-022
SUPPLY VOLTAGE IN VOLTS
200
6.0
I
OUT
= 20 mA
B
≥
B
OP
V
CC
= 12 V
SATURATION VOLTAGE IN mV
SUPPLY CURRENT IN mA
175
5.0
150
4.0
B
≤
B
RP
125
100
-50
-25
0
25
50
75
100
125
3.0
-50
-25
0
25
50
75
100
125
AMBIENT TEMPERATURE IN
°
C
Dwg. GH-024
AMBIENT TEMPERATURE IN
°
C
Dwg. GH-023
Powering up in the absence of a magnetic field (less than
B
OP
and higher than B
RP
) will allow an indeterminate output
state. The correct state is warranted after the first excursion
beyond B
OP
or B
RP
.
Bipolar switches may switch on removal of field but
require field reversal for reliable operation over temperature
range; latches will not switch on removal of magnetic field.
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3132
AND
3133
BIPOLAR
HALL-EFFECT SWITCHES
SENSOR LOCATIONS
(±0.005” [0.13mm] die placement)
SUFFIX “LT”
ACTIVE AREA DEPTH
0.0305"
0.775 mm
NOM
0.089"
2.26 mm
0.043"
1.09 mm
A
1
2
3
Dwg. MH-008-2D
SUFFIX “UA”
ACTIVE AREA DEPTH
0.0195"
0.50 mm
NOM
0.082"
2.07 mm
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 responsi-
bility for its use; nor for any infringements of patents or other rights of
third parties that may result from its use.
A
BRANDED
SURFACE
1
2
3
0.055"
1.39 mm
Dwg. MH-011-10A
Allegro
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
3132
AND
3133
BIPOLAR
HALL-EFFECT SWITCHES
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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