Diodes Incorporated AH276Z4-AG1

Overview

AH276Z4-AG1 from BCD Semiconductor Manufacturing Limited is a complementary-output Hall-effect latch IC designed for electronic commutation in brushless DC motors. It integrates a Hall sensor, amplifier, Schmitt trigger with hysteresis, temperature compensation, band-gap regulator, and dual open-collector drivers-supporting 3.5–16 V supply, ±20 °C to +85 °C operation, and 350 mA average sink current per output. Used in dual-coil BLDC fans and motor timing circuits.

For engineers reviewing the AH276Z4-AG1 datasheet, AH276Z4-AG1 pinout, AH276Z4-AG1 application, or AH276Z4-AG1 equivalent, key selection criteria include magnetic operating point (BOP = 10–50 G), release point (BRP = –50 to –10 G), complementary output polarity, thermal shutdown at 178 °C, and TO-94 (SIP-4L) package compatibility with high-current coil drive.

Technical Context

The AH276Z4-AG1 implements a bipolar latching Hall sensor architecture with built-in hysteresis (BHYS = 75 G) to reject noise and prevent chatter during magnetic field transitions. Its dual open-collector outputs (DO and DOB) provide true complementary switching: DO sinks when B > BOP, DOB sinks when B < BRP, with state retention until field reversal crosses the release threshold.

Internal circuitry includes a band-gap voltage regulator for stable biasing across 3.5–16 V input, temperature compensation to minimize sensitivity drift over –20 °C to +85 °C, and integrated over-temperature protection that disables outputs above 178 °C with 40 °C hysteresis. Reverse supply protection (–20 V) and ESD robustness (300 V MM / 2500 V HBM) support industrial motor control environments.

Key Specifications

Pinout & Package

Package: TO-94 (SIP-4L), 4-pin single-inline package with 2.54 mm pitch, low-profile (5.28 mm height), lead-free and green-compliant (G1 suffix).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Hall-effect latch applications.

Compared with A3291LUA-T and US1881EUA-ABA-000-SP, AH276Z4-AG1 uniquely combines latched bipolar operation, 350 mA drive strength, and integrated thermal protection in a TO-94 package-making it optimal for cost-sensitive, self-protected BLDC fan and motor control where magnetic field reversal defines commutation timing.

Availability

AH276Z4-AG1 is available at Aetrix Electronics and suitable for dual-coil brushless DC motor control, BLDC fan speed regulation, revolution counting, and speed measurement applications requiring stable component supply, RoHS compliance, and green packaging.

Supply support for AH276Z4-AG1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

BCD Semiconductor Manufacturing Limited is a Shanghai-based analog and mixed-signal IC designer and foundry partner specializing in high-reliability power management, motor control, and sensor interface solutions.

AH276Z4-AG1 belongs to BCD's Hall-effect sensor product line, engineered specifically for cost-effective, robust electronic commutation in commercial and light-industrial BLDC motor systems.

FAQ

What is the magnetic polarity response behavior of AH276Z4-AG1?

AH276Z4-AG1 is a bipolar latching Hall-effect device: DO turns ON (low) when a sufficient North pole field (B > BOP) is applied, and remains latched until a South pole field (B < BRP) causes DO to turn OFF and DOB to turn ON. This hysteresis (75 G) prevents oscillation near threshold and enables reliable rotor position tracking in rotating fields.

Can AH276Z4-AG1 drive a 12 V, 200 mA BLDC coil directly?

Yes. With a maximum saturation voltage of 0.35 V at 350 mA and rated continuous sink current of 350 mA, AH276Z4-AG1 can directly drive typical 12 V BLDC phase coils drawing ≤200 mA. Its thermal protection (178 °C trip) and 550 mW power dissipation rating ensure safe operation under sustained load at +85 °C ambient.

Is AH276Z4-AG1 compatible with standard TO-94 footprints?

Yes. AH276Z4-AG1 uses the industry-standard TO-94 (SIP-4L) package with 2.54 mm pin pitch, 5.28 mm body height, and defined mechanical dimensions per the datasheet. Pin 1 (VCC) is marked with a dot on the package top, matching standard SIP-4L layout used in motor control PCBs.

Does AH276Z4-AG1 require an external pull-up resistor?

Yes. Both DO and DOB are open-collector NPN outputs and require external pull-up resistors to VCC (or another logic rail) to establish valid high-level logic states. Typical values are 4.7 kΩ to 10 kΩ for general-purpose use; lower values (e.g., 820 Ω) are used in high-speed applications per the datasheet test circuit.