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AH277A (Not Recommended for New Design (NRND))

NRND = Not Recommended for New Design

Two Phase 12V/24 BLDC All-In-One Fan and Motor Drive Latch

Datasheet

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Description

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).

Feature(s)

· 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)

Application(s)

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

Specifications & Technical Documents

Product Parameters

Operating Voltage (V)	3.5 to 16 V
SupplyCurrent (mA)	12 mA
Average OutputDrive Current (mA)	400 mA
Peak Output Current (mA)	800 mA
Typical Total R_DS(ON)(NMOS and PMOS Combined)	0.87 @ 14V Ω
Typical Zener Breakdown Voltage (V)	55 V
Operating Point Bop Gauss (Min)	10, 5, 0
Operating Point Bop Gauss (Typ)	30, 0
Operating Point Bop Gauss (Max)	50, 70, 100
Release Point Brp Gauss (Min)	-50, -70, -100
Release Point Brp Gauss (Typ)	-30, 0
Release Point Brp Gauss (Max)	-10, -5, -
Operating Ambient Temperature (°C)	-20 to 85 °C

Technical Documents

Recommended Soldering Techniques

TN1.pdf

Purchase & Availability

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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-2770	2025-10-30	2025-10-30	Add Fab Site Code, Country of Diffusion (COD) and Assembly Site Origin (ASO) on Product and Shipping Labels for all Diodes Products
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)