The AH37xx family of high-voltage Hall effect latch ICs introduced by Diodes Incorporated provides various operating magnetic thresholds to address motor control, rotational position and speed sensing requirements in a wide range of applications such as controlling the commutation of brushless dc (BLDC) motors in washing machines, dishwashers, fridge-freezers, air-conditioners, food processors, power tools and cooling fans; the measurement of speed in motors, pumps and flow meters; and contactless position sensing/indexing in printers, scanners, and window blinds.
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Spanning industrial and consumer applications, the AH37xx family is designed for 3V to 28V operation and integrates a reverse-blocking diode, Zener clamps on input/output pins and an output current limit to help provide protections from transients and overload. An extended temperature specification, from -40 to +125 degrees C, and a low temperature coefficient ensure reliable operation at the switching threshold points while a 6kV ESD capability improves robustness and allows easier handling during manufacturing.
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The AH37xx Hall effect latch ICs offer excellent performance with a fast 10μs power-on time and a quick 3.75μs response time that reduces delays and commutation errors. A chopper-stabilized architecture with an internal bandgap regulator ensures temperature stability, minimizes switch point drift and provides enhanced immunity to stress. The devices also have good RF noise immunity, further contributing to overall operational reliability.
In 10k piece quantities, the AH3772, AH3774, AH3775, AH3776, AH3777, AH3781 and AH3782 are each priced between $0.162 and $0.177. All devices are available in SOT23 and SIP3 (Bulk and Ammo pack) packages with the AH3774/5 additionally available in an SC59 package.
source: http://www.powerpulse.net/story.php?storyID=33112
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