A3241 and A3242 are unipolar Hall-effect switches with digital outputs. These sensors are 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.
This document is a technical datasheet for the Allegro MicroSystems A3241 and A3242 integrated circuits. These devices are unipolar Hall-effect switches with digital outputs designed for operation over extended temperature ranges, specifically up to +150°C for the L temperature range.
The chips utilize an advanced BiCMOS wafer fabrication process that includes a voltage regulator, Hall-voltage generator, small-signal amplifier, chopper stabilization, and a Schmitt trigger. Key features include superior high-temperature performance via patented dynamic offset cancellation, reverse battery protection, short circuit protection on the open-drain output, and availability in ultrasmall SOT23W (LH) or SIP (UA) packages.
| Maximum Ambient Temperature (L range) | +150°C |
|---|---|
| A3241 Operate Point (Typical) | 95 G |
| A3242 Operate Point (Typical) | 150 G |
The A3241 and A3242 are rated for operation between -40°C and 85°C for the E range, and -40°C to 150°C for the L temperature range.
They are unipolar Hall-effect switches that operate with a sufficient south polarity field only and turn off in the absence of such a field.