The A1242 Hall effect latch is a two-wire latch especially suited for operation over extended temperature ranges, from 40 to +150°C. Superior high-tempera- ture performance is made possible through the Allegro® patented dynamic offset cancellation technique, which reduces the residual offset voltage normally caused by device overmolding, temperature dependencies, and thermal stress.
The current-switching output technique allows for the reduction in cost in the wiring harness because only two connections to the sensor are required. The cur- rent-switching output structure also inherently provides more immunity against EMC/ESD transients. These sensors have low magnetic thresholds, thereby enabling more flexibility in the magnetic circuit design.
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Chopper stabilization Superior temperature stability Extremely low switchpoint drift Insensitive to physical stress Reverse battery protection Solid-state reliability Small size Robust EMC capability High ESD ratings (HBM)
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Supply Voltage, VCC .......................................... 28 V
Reverse-Supply Voltage, VRCC ........................18 V
Magnetic Flux Density, B .............................Unlimited
Operating Temperature
Ambient, TA, Range E........................40ºC to 85ºC
Ambient, TA, Range L......................40ºC to 150ºC
Maximum Junction, TJ(max).............................165ºC
Storage Temperature, T..................65ºC to 170ºC
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Required Field 
