A1101

The Allegro® A1101-A1104 and A1106 Hall-effect switches are next generation  replacements for the popular Allegro 312x and 314x lines of bipolar switches.  The A110x family, produced with BiCMOS technology, consists of devices that  feature fast power-on time and low noise operation. Device programming is per- formed 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 volt- age normally caused by device overmolding, temperature excursions, and thermal  stress.

The A1101-A1104 and A1106 Hall-effect switches include the following on a  single silicon chip: voltage regulator, Hall-voltage generator, small-signal ampli- fier, 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.