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Dual Complementary Output Hall Effect Latch with Reverse Blocking Diode on Supply Pin


The AH277A is an integrated Hall sensor with output driver designed for electronic commutation of brushless DC motor applications. The device includes an onchip Hall sensor for magnetic sensing, an amplifier that amplifies the Hall voltage, a Schmitt trigger to provide switching hysteresis for noise rejection, a temperature compensation circuit to compensate the temperature drift of Hall sensitivity and two complementary open-collector drivers for sinking large load current. It also includes an internal band-gap regulator which is used to provide bias voltage for internal circuits. Placing the device in a variable magnetic field, if the magnetic flux density is larger than threshold BOP, the pin DO will be turned low (on) and pin DOB will be turned high (off). This output state is held until the magnetic flux density reverses and falls below BRP, then causes DO to be turned high (off) and DOB turned low (on).


· Dual-Coil Brushless DC Motor · Dual-Coil Brushless DC Fan · Revolution Counting · Speed Measurement


· On-Chip Hall Sensor · 3.5V to 16V Supply Voltage · 400mA (avg) Output Sink Current · Reversed Supply Voltage Protection · -20°C to 85°C Operating Temperature · Low Profile TO-94 (SIP-4L) Package · ESD Rating: 300V (Machine Model)

Product Specifications

Product Parameters

Average Supply Current 12 mA
Operating Ambient Temperature -20 to 85 °C
Operating Point Bop (Bops +ve/ Bopn -ve) Gauss (Min) 10, 5
Operating Voltage 3.5 to 16 V
Output Type Dual Complementary Open Collector Active Low
Release Point Brp (Brps +ve/Brpn -ve) Gauss (Max) -10, -5
Grade A, B, C
Operating Point Bop (Bops +ve/ Bopn -ve) Gauss (Max) 50, 70, 100
Output Current Capability 400, 800 mA
Release Point Brp (Brps +ve/Brpn -ve) Gauss (Min) -50, -70, -100
Operating Point Bop (Bops +ve/ Bopn -ve) Gauss (Typ) 30
Release Point Brp (Brps +ve/Brpn -ve) Gauss (Typ) -30

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Orderable Part Number Authorized Distributor Quantity Inventory Date Buy Online Region
AH277AZ4-AG1 Mouser Electronics Inc. 881 8/18/2019 Buy Now Americas
AH277AZ4-BG1 Mouser Electronics Inc. 998 8/18/2019 Buy Now Americas
AH277AZ4-CG1 Mouser Electronics Inc. 660 8/18/2019 Buy Now Americas