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.
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.
ULTRA-SENSITIVE BIPOLAR
HALL-EFFECT SWITCHES
FEATURES
s 4.5 V to 24 V Operation
s Reverse Battery Protection
s Superior Temperature Stability
s Superior Supply Voltage Stability
s Activate with Multi-Pole Ring Magnets
s Solid-State Reliability
s Small Size
s Constant Output Amplitude
s Resistant to Physical Stress
Data Sheet
27631.2C
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
Always order by complete part number
including prefix and suffix, e.g., UGN3132LT .
Pinning is shown viewed from branded side.
3132
AND
3133
Dwg. PH-003A
1
SUPPLY
V
CC
GROUND
3
2
OUTPUT
X
3132
AND
3133
BIPOLAR
HALL-EFFECT SWITCHES
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
FUNCTIONAL BLOCK DIAGRAM
V
CC
X
REG.
Dwg. FH-005-2
GROUND
OUTPUT
3
2
1
Limits
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Supply Voltage
V
CC
Operating
4.5
--
24
V
Output Saturation Voltage
V
OUT(SAT)
I
OUT
= 20 mA, B
B
OP
--
145
400
mV
Output Leakage Current
I
OFF
V
OUT
= 24 V, B
B
RP
--
<1.010
A
Supply Current
I
CC
V
CC
= 24 V, B
B
RP
--
4.3
9.0mA
Output Rise Time
t
r
V
CC
= 12 V, R
L
= 820
, C
L
= 20 pF
--
0.04
2.0
s
Output Fall Time
t
f
V
CC
= 12 V, R
L
= 820
, C
L
= 20 pF
--
0.18
2.0
s
Limits
Characteristic
Symbol
Device Type*
Min.
Typ.
Max.
Units
Operate Point
B
OP
3132
--
32
95
G
3133
--
32
75
G
Release Point
B
RP
3132
-95
-20--
G
3133
-75
-20--
G
Hysteresis
B
hys
Both
3052
--
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).
ELECTRICAL CHARACTERISTICS at T
A
= +25
C
MAGNETIC CHARACTERISTICS over operating temperature and voltage range.
Copyright 1996, 2003 Allegro MicroSystems, Inc.
3132
AND
3133
BIPOLAR
HALL-EFFECT SWITCHES
www.allegromicro.com
TYPICAL CHARACTERISTICS
12
16
20
SUPPLY VOLTAGE IN VOLTS
4.0
Dwg. GH-021
24
8.0
RELEASE POINT
I = 20 mA
OUT
SWITCH POINT IN GAUSS
40
20
0
-20
-40
OPERATE POINT
28
T = 25
C
A
0
25
50
75
100
AMBIENT TEMPERATURE IN
C
-50
Dwg. GH-022
125
-25
I = 20 mA
V = 12 V
CC
OUT
SWITCH POINT IN GAUSS
40
20
0
-20
-40
RELEASE POINT
OPERATE POINT
0
25
50
75
100
AMBIENT TEMPERATURE IN
C
-50
Dwg. GH-023
125
-25
V = 12 V
CC
B
B
RP
SUPPLY CURRENT IN mA
6.0
5.0
4.0
3.0
B
B
OP
0
25
50
75
100
200
100
AMBIENT TEMPERATURE IN
C
175
150
125
-50
Dwg. GH-024
SATURATION VOLTAGE IN mV
125
-25
I = 20 mA
OUT
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.
3132
AND
3133
BIPOLAR
HALL-EFFECT SWITCHES
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
SUFFIX "UA"
0.043"
1.09 mm
1
3
2
Dwg. MH-008-2D
0.0305"
0.775 mm
NOM
ACTIVE AREA DEPTH
0.089"
2.26 mm
A
1
3
2
Dwg. MH-011-10A
0.0195"
0.50 mm
NOM
BRANDED
SURFACE
ACTIVE AREA DEPTH
0.082"
2.07 mm
0.055"
1.39 mm
A
SENSOR LOCATIONS
(
0.005" [0.13mm] die placement)
SUFFIX "LT"
Allegro
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.
3132
AND
3133
BIPOLAR
HALL-EFFECT SWITCHES
www.allegromicro.com
PACKAGE DESIGNATOR `LT'
(SOT89/TO-243AA)
Dimensions in Inches
(for reference only)
Dimensions in Millimeters
(controlling dimensions)
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.
Dwg. MA-009-3A in
1
2
3
0.072
0.064
0.167
0.155
0.059
BSC
0.0189
0.0142
0.047
0.035
0.102
0.090
0.063
0.055
0.0173
0.0138
0.090
0.084
0.0221
0.0173
0.118
BSC
0.181
0.173
Dwg. MA-009-3A mm
1
2
3
4.60
4.40
1.83
1.62
4.25
3.94
1.50
BSC
0.48
0.36
1.20
0.89
2.60
2.29
1.60
1.40
0.44
0.35
2.29
2.13
0.56
0.44
3.00
BSC
1
B
0.098
0.031
0.102
0.047
0.181
0.079
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
2
0.028
TYP
0.031
TYP
A
3
1
3
B
2.5
0.8
2.6
1.2
4.6
2.0
Dwg. MA-012-3 mm
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
2
0.7
TYP
0.8
TYP
A
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