A3134: Bipolar Hall-Effect Switch for High-Temperature Operation

A3134
Bipolar Hall Effect Switch for High-Temperature Operation
Discontinued Product
These parts are no longer in production The device should not be
purchased for new design applications. Samples are no longer available.
Date of status change: October 31, 2005
Recommended Substitutions:
For new customers and applications, refer to the A1201
NOTE: For detailed information on purchasing options, contact your
local Allegro field applications engineer or sales representative.
Allegro MicroSystems, Inc. reserves the right to make, from time to time, revisions to the anticipated product life cycle plan for a
product to accommodate changes in production capabilities, alternative product availabilities, or market demand. 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.
Data Sheet
27631.4D
3134
BIPOLAR HALL-EFFECT SWITCH
FOR HIGH-TEMPERATURE OPERATION
X
This low-hysteresis bipolar Hall-effect switch is an extremely
temperature-stable and stress-resistant device especially suited for
operation over extended temperature ranges to +150°C. Superior
high-temperature performance is made possible through a novel Schmitt
trigger circuit that maintains operate and release point stability by
compensating for temperature changes in the Hall element. Additionally,
internal compensation provides magnetic switch points that become more
sensitive with temperature, hence offsetting the usual degradation of the
magnetic field with temperature. Its low hysteresis makes this device
ideal for detecting small changes in magnetic field strength or for use
with inexpensive magnets.
CC
2
3
OUTPUT
SUPPLY
1
GROUND
V
Dwg. PH-003A
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C
Supply Voltage, VCC ............................. 30 V
Reverse Battery Voltage, VRCC .......... -30 V
Magnetic Flux Density, B .......... Unlimited
Output OFF Voltage, VOUT .................. 30 V
Reverse Output Voltage, VOUT ........... -0.5 V
Continuous Output Current,
IOUT ............................................ 25 mA
Operating Temperature Range, TA
Suffix ‘E–’ .................. -40°C to +85°C
Suffix ‘L–’ ................ -40°C to +150°C
Storage Temperature Range,
TS .............................. -65°C to +170°C
The device includes on a single silicon chip a voltage regulator,
quadratic Hall-voltage generator, temperature compensation circuit,
signal amplifier, Schmitt trigger, and a buffered open-collector output to
sink up to 25 mA. The on-board regulator permits operation with supply
voltages of 4.5 volts to 24 volts.
The first character of the part number suffix determines the device
operating temperature range. Suffix ‘E–’ is for -40°C to +85°C, and
suffix ‘L–’ is -40°C to +150°C. Two package styles provide a magnetically optimized package for most applications. Suffix ‘–LT’ is a miniature SOT89/TO-243AA transistor package for surface-mount applications while suffix ‘–UA’ is a three-lead ultra-mini-SIP.
FEATURES
■ Superior Temperature Stability
■ Operation From Unregulated Supply
■ Open-Collector 25 mA Output
■ 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., A3134ELT .
3134
LOW-HYSTERESIS
BIPOLAR HALL-EFFECT SWITCH
FOR HIGH-TEMP. OPERATION
FUNCTIONAL BLOCK DIAGRAM
1
VCC
REG.
X
3
OUTPUT
2
GROUND
Dwg. FH-005-3
ELECTRICAL CHARACTERISTICS over operating temperature range, at VCC = 12 V.
Limits
Characteristic
Symbol
Supply Voltage
VCC
Min.
Typ.
Max.
Units
Operating
4.5
—
24
V
VOUT(SAT)
IOUT = 20 mA, B > BOP
—
175
400
mV
Output Leakage Current
IOFF
VOUT = 24 V, B < BRP
—
0.05
1.0
µA
Supply Current
ICC
B < BRP (Output OFF)
—
3.2
9.0
mA
B > BOP (Output ON)
—
5.0
—
mA
Output Saturation Voltage
Test Conditions
Output Rise Time
tr
RL = 820 Ω, CL = 20 pF
—
100
—
ns
Output Fall Time
tf
RL = 820 Ω, CL = 20 pF
—
100
—
ns
MAGNETIC CHARACTERISTICS over oper. temp. and oper. supply voltage ranges.
Limits
Characteristic
Symbol
Operate Point
Test Conditions
Min.
Typ.
Max.
Units
BOP
-40
8.5
60
G
Release Point
BRP
-50
-19
50
G
Hysteresis
Bhys
5.0
27
55
G
NOTES: BOP = operate point (output turns ON); BRP = release point (output turns OFF); Bhys = hysteresis (BOP - BRP).
As used here, negative flux densities are defined as less than zero (algebraic convention).
Typical values are at TA = +25°C and VCC = 12 V.
1 gauss (G) is exactly equal to 0.1 millitesla (mT).
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1995, 2003 Allegro MicroSystems, Inc.
3134
LOW-HYSTERESIS
BIPOLAR HALL-EFFECT SWITCH
FOR HIGH-TEMP. OPERATION
TYPICAL OPERATING CHARACTERISTICS
SWITCH POINTS
HYSTERESIS
50
40
VCC = 4.5 V–24 V
40
HYSTERESIS IN GAUSS
SWITCH POINT IN GAUSS
20
OPERATE POINT
0
-20
VCC = 4.5 V–24 V
30
20
10
RELEASE POINT
-40
-50
0
-25
0
25
50
100
75
125
-50
150
-25
0
25
50
100
75
125
150
AMBIENT TEMPERATURE IN ° C
AMBIENT TEMPERATURE IN °C
Dwg. GH-051
Dwg. GH-052
OUTPUT SATURATION VOLTAGE
SUPPLY CURRENT
5.0
300
I OUT = 20 mA
B < B RP
4.0
SUPPLY CURRENT IN mA
SATURATION VOLTAGE IN mV
V CC = 4.5–24 V
200
100
0
-50
V CC = 24 V
V CC = 12 V
3.0
VCC = 4.5 V
2.0
1.0
-25
0
25
50
75
100
125
150
Dwg. GH-029
www.allegromicro.com
-50
-25
0
25
50
75
AMBIENT TEMPERATURE IN °C
AMBIENT TEMPERATURE IN ° C
100
125
150
Dwg. GH-053
3134
LOW-HYSTERESIS
BIPOLAR HALL-EFFECT SWITCH
FOR HIGH-TEMP. OPERATION
ELEMENT LOCATIONS
(±0.005" [0.13 mm] die placement)
Suffix “LT”
ACTIVE AREA DEPTH
0.0305"
0.775 mm
NOM
0.090"
2.27 mm
0.050"
1.27 mm
A
1
2
3
Suffix “UA”
0.083"
2.10 mm
0.060"
1.51 mm
A
BRANDED
SURFACE
1
2
Extensive applications information for Hall-effect devices 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
OPERATION
Dwg. MH-008-4C
ACTIVE AREA DEPTH
0.0195"
0.50 mm
NOM
APPLICATIONS INFORMATION
The output of these devices (pin 3) switches low when the magnetic field
at the Hall element exceeds the operate point threshold (B OP). At this point, the
output voltage is VOUT(SAT). When the magnetic field is reduced to below the
release point (BRP) the device output goes high. Note especially that release
can occur when the magnetic field is removed but to ensure release, a field
reversal is required. 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.
Powering up the device in the absence of a magnetic field (less than BOP
and higher than BRP) will allow in indeterminate output state. The correct state
is warranted after the first excursion beyond BOP or BRP.
3
Dwg. MH-011-4C
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 responsibility for its use; nor for any infringements of patents or other rights of third parties that may result from its use.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
3134
LOW-HYSTERESIS
BIPOLAR HALL-EFFECT SWITCH
FOR HIGH-TEMP. OPERATION
PACKAGE DESIGNATOR ‘LT’
(SOT89/TO-243AA)
Dimensions in Inches
(for reference only)
0.181
0.173
0.072
0.064
0.167
0.155
1
2
0.063
0.055
0.102
0.090
3
Dimensions in Millimeters
(controlling dimensions)
0.090
0.084
4.25
3.94
0.0189
0.0142
0.0221
0.0173
0.047
0.035
0.059
4.60
4.40
1.83
1.62
0.0173
0.0138
1.50
3.00
BSC
Dwg. MA-009-3A in
Dwg. MA-009-3A mm
2.5
2.0
0.098
0.079
B
B
0.031
0.102
A
0.8
2.6
A
4.6
0.181
1
2
2.29
2.13
0.56
0.44
0.118
BSC
2.60
2.29
3
0.44
0.35
0.48
0.36
1.20
0.89
BSC
BSC
2
1
1.60
1.40
3 0.047
1
2
3
1.2
0.028
0.031
0.7
0.8
TYP
TYP
TYP
TYP
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
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
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.
www.allegromicro.com
3134
LOW-HYSTERESIS
BIPOLAR HALL-EFFECT SWITCH
FOR HIGH-TEMP. OPERATION
PACKAGE DESIGNATOR ‘UA’
Dimensions in Millimeters
(for reference only)
Dimensions in Inches
(controlling dimensions)
0.164
0.159
4.17
4.04
0.062
0.058
45°
1.57
1.47
45°
0.122
0.117
3.10
2.97
45°
45°
0.085
1
2
3
0.031
2.16
1
2
0.79
3
MAX
MAX
0.640
0.600
16.26
15.24
0.0173
0.0138
0.0189
0.0142
SEE NOTE
0.44
0.35
0.48
0.36
SEE NOTE
1.27
0.050
BSC
BSC
Dwg. MH-014E in
Dwg. MH-014E mm
Radial Lead Form (order A3240xUA-LC)
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).
5. Where no tolerance is specified, dimension is nominal.
6. Supplied in bulk pack (500 pieces per bag).
1
2
3
0.108"
(2.74 mm)
0.620"
0.500"
(15.7 mm
12.7 mm)
0.100"
(2.5 mm)
Dwg. MH-026
NOTE: Lead-form dimensions are the nominals produced on the
forming equipment. No dimensional tolerance is implied or
guaranteed for bulk packaging (500 pieces per bag).
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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