AH3777-SA-7

AH3777 HIGH-VOLTGAE LOW-SENSITIVITY HALL EFFECT LATCH Description Pin Assignments The AH3777 is a high voltage, low sensitivity Hall effect latch IC designed for commutation of brushless DC motors, flow meters, linear encoders and position sensors in industrial and consumer home appliance and personal care applications. To support a wide range of demanding applications, the design is optimized to operate over the supply range of 3.0V to 28V. With chopper-stabilized architecture and an internal bandgap regulator to provide temperature compensated supply for internal circuits, the AH3777 provides a reliable solution over the whole operating range. For robustness and protection, the device has a reverse blocking diode with a Zener clamp on the supply. The output has an overcurrent limit and a Zener clamp. (Top View) 3 OUTPUT GND 2 1 VDD SOT23 (Top View) The single, open-drain output can be switched on with South pole of sufficient strength and switched off with North pole of sufficient strength. When the magnetic flux density (B) perpendicular to the package is larger than the operate point (BOP) the output is switched 3. OUTPUT 2. GND 1. VDD on (pulled low). The output is held latched until magnetic flux density reverses and becomes lower than the release point (BRP). SIP-3 Features Applications • • • Bipolar Latch Operation (South Pole: On, North Pole: off) 3.0V to 28V Operating Voltage Range Low Sensitivity: BOP and BRP of +140G and -140G Typical • • Single, Open-Drain Output with Overcurrent Limit Chopper Stabilized Design Provides Superior Temperature Stability Minimal Switch Point Drift Enhanced Immunity to Stress Good RF Noise Immunity Reverse Blocking Diode and Zener Clamp on Supply -40°C to +125°C Operating Temperature ESD (HBM): 6kV Industry Standard SOT23 and SIP-3 Packages Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. “Green” Device (Note 3) • • • • • • • • • • • • Notes: Brushless DC Motor Commutation Revolution Per Minute (RPM) Measurement Flow Meters Angular and Linear Encoder and Position Sensors Contactless Commutation, Speed Measurement and Angular Position Sensing/Indexing in Consumer Home Appliances, Office Equipment and Industrial Applications 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as those which contain