This Hall-effect switch is a monolithic integrated circuit designed to
operate continuously over extended temperatures to +85°C. The unipo-
lar switching characteristic makes this device ideal for use with a simple
bar or rod magnet. The A3161ELT and A3161EUA are identical except
for package.
Each device includes a voltage regulator for operation with supply
voltages of 3.5 to 25 volts, reverse battery protection diode, quadratic
Hall-voltage generator, temperature compensation circuitry, small-signal
amplifier, Schmitt trigger, and a constant-current open-collector output.
Noise radiation is limited by control of the output current slew rate.
Two package styles provide a magnetically optimized package for
most applications. Suffix ‘LT’ is a miniature SOT-89/TO-243AA
transistor package for surface-mount applications; suffix ‘UA’ is a three-
lead ultra-mini SIP for through-hole mounting.
HALL-EFFECT SWITCH
FOR 2-WIRE APPLICATIONS
Always order by complete part number, e.g., A3161ELT .
Data Sheet
27621.30A‡
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
at T
A
= +25°C
FEATURES and BENEFITS
a73 Internal Current Regulator for 2-Wire Operation
a73 Output Slew Rate Controlled
a73 3.5 V to 25 V Operation … Needs Only An Unregulated Supply
a73 Reverse Battery Protection
a73 Excellent Temp. Stability
a73 Activate with Small, Commercially Available Permanent Magnets
a73 Small Size
a73 Solid-State Reliability … No Moving Parts
a73 Resistant to Physical Stress
3161
Supply Voltage, V
CC
Continuous................................. 28 V
Surge (t
w
≤ 100 ms).................... 40 V
Reverse Battery Voltage, V
RCC
Continuous................................ -25 V
Surge (t
w
≤ 100 ms)................... -40 V
Magnetic Flux Density, B ....... Unlimited
Output OFF Voltage, V
OUT
.............. 28 V
Operating Temperature Range,
T
A
............................. -40°C to +85°C
Storage Temperature Range,
T
S
........................... -65°C to +170°C
Dwg. PH-003-3
1
SUPPLY
V
CC
GROUND
32
OUTPUT
X