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High Voltage High Sensitivity Hall Effect Latch with Supply and Output Pin Clamp, Reverse Voltage Protection and Current Limit

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The AH3777 is a high voltage low 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 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 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 AH3777 is available in industry standard SOT23 and SIP-3 packages.


  • Brushless DC Motor Commutation
  • Revolution Per Minute (RPM) Measurement
  • Flow Meters
  • 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 SOT23 and SIP-3 Packages
  • Totally Lead-Free & Fully RoHS Compliant
  • Halogen and Antimony Free. “Green” Device

Product Specifications

Product Parameters

Qualified to AECQ10x No
Automotive Compliant PPAP No
Output Type Single, Open Drain, Active Low
Operating Voltage 3 to 28 V
Average Supply Current 3 mA
Output Current Capability 30 mA
Grade -
Operating Point Bop (Bops +ve/ Bopn -ve) Gauss (Min) 110
Operating Point Bop (Bops +ve/ Bopn -ve) Gauss (Typ) 140
Operating Point Bop (Bops +ve/ Bopn -ve) Gauss (Max) 170
Release Point Brp (Brps +ve/Brpn -ve) Gauss (Min) -170
Release Point Brp (Brps +ve/Brpn -ve) Gauss (Typ) -140
Release Point Brp (Brps +ve/Brpn -ve) Gauss (Max) -110
Operating Ambient Temperature -40 to 125 °C

Related Content

SIP-3 (Ammo)
SIP-3 (Bulk)


Technical Documents

Recommended Soldering Techniques


Orderable Part Number Authorized Distributor Quantity Inventory Date Buy Online Region
AH3777-P-B Digi-Key Electronics 57 8/8/2020 Buy Now United States
AH3777-P-B Mouser Electronics Inc. 532 8/8/2020 Buy Now United States
AH3777-SA-7 Digi-Key Electronics 2801 8/8/2020 Buy Now United States
AH3777-SA-7 Mouser Electronics Inc. 2860 8/8/2020 Buy Now United States