A1212

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 nor- mally 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.