Diodes Incorporated
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Two Phase 5V/12V BLDC All-In-One Fan and Motor Drive Latch with Output Zener Clamp

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The AH211 is an integrated Hall sensor with output driver and frequency generator designed for electronic commutation of brush-less DC motor applications. Thedevice includes an on-chip 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, 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. Place the device in a variable magnetic field, while the magnetic flux density is larger than threshold BOP, DO will be turned on (low) and DOB (and FG) will be turned off (high). This output state is held till the magnetic flux density reversal falls below BRP causing DO to be turned off (high) and DOB (and FG) turned on (low).


· On-Chip Hall Sensor · 3.5V to 16V Supply Voltage · 400mA (avg) Output Sink Current · -20oC to 85oC Operating Temperature · Built-in FG Output · Low Profile TO-94 (SIP-4L) Package · ESD Rating: 600V (Machine Model)


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

Product Specifications

Product Parameters

Operating Voltage (V) 3.5 to 16 V
SupplyCurrent (mA) 4 mA
Average OutputDrive Current (mA) 400 mA
Peak Output Current (mA) 800 mA
Typical Total RDS(ON)(NMOS and PMOS Combined) 2.6 @ 14V Ω
Typical Zener Breakdown Voltage (V) 31 V
Operating Point Bop Gauss (Min) 5, 0
Operating Point Bop Gauss (Typ) 30, 0
Operating Point Bop Gauss (Max) 60, 90
Release Point Brp Gauss (Min) -60, -90
Release Point Brp Gauss (Typ) -30, 0
Release Point Brp Gauss (Max) -5, -
Lock Detect, Shut-Down and Auto Start -
Frequency Generator (FG) and Rotation Detect FG RD
Operating Ambient Temperature (°C) -20 to 85 °C

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Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2654 2024-02-15 2024-04-28 Device End of Life (EOL)
PCN-2527 2021-06-09 2021-09-09 Additional Wafer Source (GFAB, JKFAB), New Bill of Materials (BOM) with PdCu Bond Wire, and Additional Assembly/Test
(A/T) Site (CAT)