The A1222 Hall-effect sensor IC is extremely temperature stable and stress-resistant and especially suited for operation over extended temperature ranges to 150°C. Superior high temperature performance is made possible through dynamic offset cancellation, which reduces the residual offset voltage normally caused by device over-molding, temperature dependencies, and thermal stress. Each device includes on a single silicon chip: a voltage regulator, Hall-voltage generator, small-signal amplifier, chopper stabilization, Schmitt trigger, and short-circuit protected open-collector output that can sink up to 25 mA. A south pole of sufficient strength will turn the output on. A north pole is necessary to turn the output off. These types of devices are most commonly used to detect speed and direction of ring magnets in motors for commutating the motors.

An on-board regulator permits operation with supply voltages of 3.0 to 24 V. The advantage of reducing the minimum operating voltage is that it can be used in 3 V applications or additional external resistance can be added in series with the supply pin for greater protection against transient events. Two package styles provide a magnetically optimized package for most applications. Package type LH is a modified SOT23W, surface mount package, while the UA is a three-lead, ultra-mini-SIP for through-hole mounting. Each package type is available as lead (Pb) free (suffix, -T), with a 100% matte tin-plated lead frame.

The A1222 is intended to replace the A3282. A replacement for the A3283 (A1223) can also be expected by the end of 2009.