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The AH3774 is a high voltage high sensitivity Hall Effect latch IC designed for commutation of brushless DC motor, flow meters, linear encoders and position sensors in industrial and consumer home appliance and personal care applications. To support wide range of demanding applications, the design has been 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 AH3774 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 a current limit and a Zener clamp.
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 on (pulled low). The output is held latched until magnetic flux density reverses and becomes lower than the release point (Brp).
The AH3774 is available in industry standard SC59, SOT23 and SIP-3 package.
Brushless DC Motor Commutation
Revolution Per Minute (RPM) Measurement
Angular and Linear Encoder and Position Sensors
Contact-less Commutation, Speed Measurement and Angular Position Sensing/Indexing in Consumer Home Appliances, Office Equipments and Industrial Applications
Bipolar Latch Operation (South Pole: On, North Pole: off)
3.0V to 28V Operating Voltage Range
High Sensitivity: Bop and Brp of +25Gand -25G typical
Single Open Drain Output with Current 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 SC59, SOT23 and SIP-3 Packages
Totally Lead-Free & Fully RoHS Compliant
Halogen and Antimony Free. “Green” Device
Qualified to AECQ10x
Automotive Compliant PPAP
Single, Open Drain, Active Low
3 to 28 V
Average Supply Current
Output Current Capability
Operating Point Bop (Bops +ve/ Bopn -ve) Gauss (Min)
Operating Point Bop (Bops +ve/ Bopn -ve) Gauss (Typ)
Operating Point Bop (Bops +ve/ Bopn -ve) Gauss (Max)