Allegro prgrammable Hall-effect switch for industrial

Allegro MicroSystems Europe’s A1128 field-programmable, unipolar Hall-effect switch is designed for high-temperature automotive and industrial applications, particularly those involving proximity sensing with ferromagnetic targets.

The device uses a chopper-stabilisation technique to eliminate the offset inherent in single-element devices, and incorporates a programming algorithm with high programming resolution for tighter magnetic switch points.

External programming is used to set the magnetic operating point while the hysteresis remains fixed.


This allows for optimisation of the sensor IC switch point, which can reduce the effects of mechanical placement tolerances found in end-user production environments.


Other programmable parameters include output polarity and output fall time for reduced EMI in automotive applications.

A proprietary dynamic offset cancellation technique, with an internal high-frequency clock, is designed to reduce the residual offset voltage, which is normally caused by device overmoulding, temperature dependencies, and thermal stress.

The device includes an on-board voltage regulator for 3 to 24 V operation, and features on-chip protection against supply transients, output short-circuits, and reverse battery condition.

The A1128 is offered in the UA three-lead ultra-miniature single-in-line package for through-hole mounting. This package is lead (Pb) free, with 100% matt tin-plated lead frames.


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