Diodes Incorporated AH276Z4-CG1

Overview

AH276Z4-CG1 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, ±100 G magnetic thresholds (Grade C), and 350 mA continuous sink current per output. Used in dual-coil BLDC fans and speed measurement systems.

For engineers reviewing the AH276Z4-CG1 datasheet, AH276Z4-CG1 pinout, AH276Z4-CG1 application, or AH276Z4-CG1 equivalent, key selection criteria include magnetic operating/releasing points (BOP/BRP = ±100 G), complementary output timing differential (∆t ≤ 10 µs), thermal shutdown threshold (178 °C), reverse voltage protection (−20 V), and TO-94 package compatibility with SIP-4L footprint constraints.

Technical Context

The AH276Z4-CG1 implements a bipolar latching Hall sensor architecture with built-in hysteresis (BHYS = 75 G) to reject noise during magnetic field transitions. Its dual open-collector outputs (DO/DOB) switch complementarily: DO sinks when flux exceeds +100 G (BOP), and DOB sinks when flux falls below −100 G (BRP), enabling precise rotor position detection in 2-phase motor drives.

Internal circuitry includes a band-gap regulator for stable biasing across 3.5–16 V input, temperature-compensated Hall sensitivity to maintain BOP/BRP stability over −20 to +85 °C, and integrated over-temperature protection that disables outputs at 178 °C with 40 °C hysteresis-ensuring safe operation under sustained load conditions.

Key Specifications

Pinout & Package

Supplied in low-profile TO-94 (SIP-4L) package with 1.27 mm lead pitch, 14.0–15.3 mm body length, and Hall element centered beneath pin 2/3 die area per mechanical drawing.

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-CG1 uniquely combines complementary open-collector outputs, −20 V reverse protection, and Grade C ±100 G thresholds in TO-94-making it optimal for cost-sensitive, high-noise BLDC fan designs requiring minimal external components.

Availability

AH276Z4-CG1 is available at Aetrix Electronics and suitable for brushless DC motor commutation, dual-coil fan control, and revolution counting applications requiring stable component supply, green RoHS-compliant packaging, and long-term industrial availability.

Supply support for AH276Z4-CG1 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 specializing in power management, motor control, and sensor interface solutions for industrial and consumer markets.

AH276 belongs to BCD's Hall-effect sensor product line, engineered specifically for robust, low-cost electronic commutation in brushless DC motors and motion feedback systems-emphasizing latch stability, thermal resilience, and system-level integration.

FAQ

What is the magnetic sensitivity grade of AH276Z4-CG1?

AH276Z4-CG1 is Grade C, with confirmed magnetic operating point (BOP) and releasing point (BRP) of ±100 Gauss at 25 °C. This grade provides wide hysteresis (75 G) for noise immunity in high-EMI motor environments and maintains specification across −20 to +85 °C ambient per datasheet Figure 9.

Can AH276Z4-CG1 drive MOSFET gates directly?

Yes-each open-collector output (DO/DOB) sinks up to 350 mA continuously and 750 mA peak, sufficient to charge/discharge typical 1 nF gate capacitances at 20 kHz with <10 µs rise/fall times. External 10 kΩ pull-up to 12 V is required; gate resistor selection must limit peak current to <750 mA during switching.

Does AH276Z4-CG1 require external decoupling capacitors?

Yes-a minimum 1 µF ceramic capacitor between VCC and GND is required per datasheet Figure 12 and layout guidelines. This stabilizes the internal band-gap regulator during output switching transients and suppresses supply bounce caused by 350 mA load current steps.

Is AH276Z4-CG1 compatible with 3.3 V logic systems?

No-AH276Z4-CG1 has a 3.5 V minimum supply voltage and open-collector outputs referenced to its own VCC. To interface with 3.3 V controllers, use a level-shifting pull-up (e.g., 3.3 V on DO/DOB) and ensure controller inputs tolerate 12 V when outputs are high-impedance; direct 3.3 V supply will cause functional failure.