The A3280--, A3281--, and A3283-- Hall-effect latches are ex-

tremely temperature-stable and stress-resistant sensors especially suited

for operation over extended temperature ranges to +150

°C. Superior

high-temperature performance is made possible through dynamic offset

cancellation, which reduces the residual offset voltage normally caused

by device overmolding, temperature dependencies, and thermal stress.

The three devices are identical except for magnetic switch points.

Each device includes on a single silicon chip a voltage regulator,

Hall-voltage generator, small-signal amplifier, chopper stabilization,

Schmitt trigger, and a short-circuit protected open-collector output to

sink up to 25 mA. A south pole of sufficient strength will turn the

output on. A north pole is necessary to turn the output off. An on-board

regulator permits operation with supply voltages of 4.2 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

‘L–’ is -40

°C to +150°C. Three package styles provide a magnetically

optimized package for most applications. Suffix ‘–LH’ is a miniature

SOT23W low-profile surface-mount package, ‘–LT’ is a miniature

SOT89/TO-243AA transistor package for surface-mount applications;

while suffix ‘–UA’ is a three-lead ultra-mini-SIP for through-hole

mounting.

FEATURES

s Symmetrical Switch Points

s Resistant to Physical Stress

s Superior Temperature Stability

s Output Short-Circuit Protection

s Operation From Unregulated Supply

s Reverse Battery Protection

s Solid-State Reliability

s Small Size

3280, 3281,

AND

3283

ABSOLUTE MAXIMUM RATINGS

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

Continuous Output Current,

Suffix ‘E–’ .................. -40

Suffix ‘L–’ ................ -40

Storage Temperature Range,

*Internal current limiting is intended to protect

the device from output short circuits.

Pinning is shown viewed from branded side.

Always order by complete part number: the prefix ‘A’ + the basic four-

digit part number + a suffix to indicate operating temperature range +

a suffix to indicate package style, e.g., A3281ELH .

CHOPPER-STABILIZED, PRECISION

HALL-EFFECT LATCHES

Dwg. PH-003-2

1

V

CC

3

2

PTCT

Suffix '–LT' & '–UA' Pinning

(SOT89/TO-243AA & ultra-mini SIP)