The A3280--, A3281--, and A3283-- Hall-effect latches are ex- tremely temperature-stable and stress-resistant sensors 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 overmolding, temperature dependencies, and thermal stress. The three devices are identical except for magnetic switch points. 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-collector output to 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. An on-board regulator permits operation with supply voltages of 4.2 to 24 volts. The first character of the part number suffix determines the device operating temperature range; suffix ‘E–’ is for -40°C to +85°C and ‘L–’ is -40°C to +150°C. Three package styles provide a magnetically optimized package for most applications. Suffix ‘–LH’ is a miniature SOT23W low-profile surface-mount package, ‘–LT’ is a miniature SOT89/TO-243AA transistor package for surface-mount applications; while suffix ‘–UA’ is a three-lead ultra-mini-SIP for through-hole mounting. Data Sheet 27609.20b FEATURES I Symmetrical Switch Points I Resistant to Physical Stress I Superior Temperature Stability
This document describes the A3280, A3281, and A3283 Hall-effect latches, which are extremely temperature-stable and stress-resistant sensors suited for operation up to +150°C. The devices utilize a proprietary dynamic offset cancellation technique to reduce residual offset voltage caused by overmolding and thermal stress. They are identical in design except for their specific magnetic switch points.
| Supply Voltage Range | 4.2 to 24 V |
|---|---|
| Continuous Output Current | 25 mA |
| Operating Temperature Range | -40°C to +150°C |
| Junction Temperature | +165°C |
| Chopping Frequency | 340 kHz |
| Output Rise Time | 2.0 ps |
| Output Fall Time | 2.0 ps |
| Zener Voltage | 28 to 37 V |
The devices are suited for operation over extended temperature ranges to +150°C, with specific suffixes defining ranges from -40°C to +85°C or -40°C to +150°C.
A south pole of sufficient strength will turn the output on, while a north pole is necessary to turn the output off.
The maximum junction temperature rating is +165°C.