Always order by complete part number, e.g., A3134ELT .
FEATURES
a73 Superior Temperature Stability
a73 Operation From Unregulated Supply
a73 Open-Collector 25 mA Output
a73 Reverse Battery Protection
a73 Activate With Small, Commercially Available Permanent Magnets
a73 Solid-State Reliability
a73 Small Size
a73 Resistant to Physical Stress
This low-hysteresis bipolar Hall-effect switch is an extremely
temperature-stable and stress-resistant sensor 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.
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 magneti-
cally optimized package for most applications. Suffix ‘–LT’ is a minia-
ture SOT89/TO-243AA transistor package for surface-mount applica-
tions 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
............................. 30 V
Reverse Battery Voltage, V
RCC
.......... -30 V
Magnetic Flux Density, B .......... Unlimited
Output OFF Voltage, V
OUT
.................. 30 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
Data Sheet
27631.4D
3134
BIPOLAR HALL-EFFECT SWITCH
FOR HIGH-TEMPERATURE OPERATION
Dwg. PH-003A
1
SUPPLY
V
CC
GROUND
32
OUTPUT
X