The Allegro™ A1210-A1214 Hall-effect latches are next

generation replacements for the popular Allegro 317x and

318x lines of latching switches. The A121x family, produced

with BiCMOS technology, consists of devices that feature fast

power-on time and low-noise operation. Device programming

is performed after packaging, to ensure increased switchpoint

accuracy by eliminating offsets that can be induced by package

stress. Unique Hall element geometries and low-offset amplifiers

help to minimize noise and to reduce the residual offset voltage

normally caused by device overmolding, temperature excursions,

and thermal stress.

The A1210-A1214 Hall-effect latches include the following on

a single silicon chip: voltage regulator, Hall-voltage generator,

small-signal amplifier, Schmitt trigger, and NMOS output

transistor. The integrated voltage regulator permits operation

from 3.8 to 24 V. The extensive on-board protection circuitry

makes possible a ±30 V absolute maximum voltage rating

for superior protection in automotive and industrial motor

commutation applications, without adding external components.

All devices in the family are identical except for magnetic

switchpoint levels.

The small geometries of the BiCMOS process allow these

devices to be provided in ultrasmall packages. The package

styles available provide magnetically optimized solutions for

most applications. Package LH is an SOT23W, a miniature lowprofile surface-mount package, while package UA is a three-lead

ultramini SIP for through-hole mounting. Each package is lead

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

 

Continuous-time operation

□ Fast power-on time

□ Low noise

• Stable operation over full operating temperature range

• Reverse battery protection

• Solid-state reliability

• Factory-programmed at end-of-line for optimum

performance

• Robust EMC performance

• High ESD rating

• Regulator stability without a bypass capacitor