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 .

Pinning is shown viewed from branded side.

ABSOLUTE MAXIMUM RATINGS

at T

A

= +25

FEATURES and BENEFITS

3161

Supply Voltage, V

CC

Continuous ................................. 28 V

Surge (t

Reverse Battery Voltage, V

RCC

Continuous ................................ -25 V

Surge (t

Magnetic Flux Density, B ....... Unlimited

Output OFF Voltage, V

Operating Temperature Range,

T

Storage Temperature Range,

T

Dwg. PH-003-3

1

V

CC

3

2