The 3121, 3122, and 3123 are monolithic integrated circuits with tighter magnetic specifications, designed to operate continuously over extended temperatures to +150°C, and are more stable with both tem- perature and supply voltage changes.
This document describes the Allegro Microsystems 3121, 3122, and 3123 series of Hall-effect switches designed for high-temperature operation up to +150°C. These monolithic integrated circuits feature unipolar switching characteristics, making them ideal for use with simple bar or rod magnets. The devices include an internal voltage regulator allowing operation from 4.5V to 24V, reverse battery protection, and a Schmitt trigger output capable of sinking up to 25 mA.
| Supply Voltage | 4.5 V to 24 V |
|---|---|
| Continuous Output Current | 25 mA |
| Operating Temperature Range (Suffix L-) | -40°C to +150°C |
| Output OFF Voltage | 28V |
The operating temperature range for devices with suffix 'L-' is -40°C to +150°C.
These devices operate with unregulated supply voltages ranging from 4.5 volts to 24 volts.
The open-collector output can sink up to 25 mA.