A1120 Datasheet | Allegro MicroSystems

FEATURES AND BENEFITS - AEC-Q100 automotive qualified - Unipolar switch points - Resistant to physical stress - Superior temperature stability - Output short-circuit protection - Operation from unregulated supply - Reverse-battery protection - Solid-state reliability - Small package sizes PACKAGES: Not to scale 3-pin SOT23W (suffix LH) NOT FOR NEW DESIGN 3-pin SIP, matrix HD style (suffix UA) 3-pin SIP, chopper style (suffix UA) DESCRIPTION The A1120, A1121, A1122, A1123, and A1125 Hall-effect unipolar switches are extremely temperature-stable and stress-resistant sensor ICs, especially suited for operation over extended temperature ranges to 150°C. Superior hightemperature performance is made possible through dynamic offset cancellation, which reduces the residual offset voltage normally caused by device overmolding, 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 a short-circuit protected open-drain output to sink up to 25 m A. An on-board regulator permits operation with supply voltages of 3 to 24 V. The advantage of operating down to 3 V is that the device can be used in 3 V applications or with additional external resistance in series with the supply pin for greater protection against high-voltage transient events. For the A1120, A1121, A1122, and A1123, a south pole of sufficient strength turns the output on. Removal of the magnetic field turns the output off. The A1125 is plementary, in that for these devices, a south pole turns the A1125 output off, and removal of the magnetic field turns the output on. Two package styles provide a magnetically optimized package for most applications. Package type LH is a modified SOT23W, surface-mount package, while UA is a three-lead ultra-mini SIP for through-hole mounting. Each package type is lead (Pb) free (suffix, - T), with a 100% matte-tin-plated...