A3245

The A3245 integrated circuit is an omnipolar, ultrasensitive Hall-effect switch  with a digital output. This sensor has an integrated regulator permitting operation  to 24 V, making it the fi  rst omnipolar switch available for operation to 24 V. This  device is especially suited for operation over extended temperature ranges, up  to +150°C. Superior high-temperature performance is made possible through an  Allegro® patented dynamic offset cancellation, which reduces the residual offset  voltage normally caused by device overmolding, temperature excursions, and  thermal stress.

The A3245 Hall-effect switch includes the following on a single silicon chip:  voltage regulator, Hall-voltage generator, small-signal amplifi  er, chopper stabiliza- tion, Schmitt trigger, and a short circuit protected open-drain output. Advanced  BiCMOS wafer fabrication processing is used to take advantage of low-voltage  requirements, component matching, very low input-offset errors, and small com- ponent geometries.