Features: Chopper stabilization
Superior temperature stability
Extremely low switchpoint drift
Insensitive to physical stress
Reverse battery protectio
Output short circuit protection
Solid state reliability
Small size
Robust EMC capability
High ESD ratings (HBM)SpecificationsSupply Voltage, VCC ..........................................28 V
Reverse-Supply Voltage, VRCC .......................18 V
Reverse-Supply Current, IRCC .......................2 mA
Output Off Voltage, VOUT.................................. 28 V
Output Current, IOUTSINK............. Internally Limited
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, TS ................65ºC to 170ºCDescriptionThe A3241 and A3242 integrated circuits are unipolar Hall-effect switches with digital outputs. These sensors A3242 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.
The A3241 and A3242 Hall-effect switches include the following on a single silicon chip: voltage regulator, Hall-voltage generator, small-signal amplifier, chopper stabilization, 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 component geometries.
The integrated voltage regulator permits operation from 3.6 to 24 V. The unipolar family members operate with a sufficient south polarity field only, turning off in the absence of such a south polarity field.
The A3241 and A3242 are rated for operation between the ambient temperatures 40°C and 85°C for the E temperature range, and 40°C to 150°C for the L temperature range. The small geometries of the BiCMOS process allow these devices to be provided in ultrasmall packages. The package styles available provide magnetically optimized solutions for most applications. Package LH is an SOT23W, a miniature low-profile surface-mount package, while package UA is a three-lead ultramini SIP for through-hole mounting. Each package is available in a lead (Pb) free version, with 100% matte tin plated leadframes.
A3242 Data Sheet
