Description

TheA1220, A1221,A1222, andA1223 Hall-effect sensor ICs

are extremely temperature-stable and stress-resistant devices

especiallysuitedforoperationoverextendedtemperatureranges

to 150°C. Superior high-temperature performance is made

possiblethroughdynamicoffsetcancellation,whichreducesthe

residualoffsetvoltagenormallycausedbydeviceovermolding,

temperature dependencies, and thermal stress. Each device

includes on a single silicon chip a voltage regulator, Hall-

voltagegenerator,small-signalamplifier,chopperstabilization,

Schmitt trigger, and a short-circuit protected open-drain output

to sink up to 25 mA. A south pole of sufficient strength turns

the output on. A north pole of sufficient strength is necessary

to turn the output off.

An onboard regulator permits operation with supply voltages

of 3 to 24 V. The advantage of operating down to 3 V is that

the device can be used in 3 V applications or with additional

external resistance in series with the supply pin for greater

protection against high voltage transient events.

Two package styles provide magnetically optimized packages

for most applications. Package type LH is a modified 3-pin

SOT23W surface-mount package, while UA is a three-pin

ultra-mini SIP for through-hole mounting. Both packages are

lead (Pb) free, with 100% matte-tin-plated leadframes.

A1220-DS, Rev. 16

Features and Benefits

▪ AEC-Q100automotivequalified

▪ Symmetricallatchswitchpoints

▪ Resistanttophysicalstress

▪ Superiortemperaturestability

▪ Outputshort-circuitprotection

▪ Operationfromunregulatedsupplydownto3V

▪ Reverse-batteryprotection

▪ Solid-statereliability

▪ Smallpackagesizes

Chopper-Stabilized Precision Hall-Effect Latches

Packages:

Functional Block Diagram

Not to scale

A1220, A1221, A1222, and A1223

3-pin SOT23W

(suffix LH)

(A1222

and A1223)

(A1220

and 1221)

3-pin SIP (suffix UA)

Regulator

GND

VCC

VOUT

Control

Current Limit

To All Subcircuits

Amp

Low-Pass

Filter