Diodes Incorporated AH41Z3-BG1

Overview

AH41Z3-BG1 from BCD Semiconductor Manufacturing Limited is a bipolar latched Hall-effect position sensor IC designed for electronic commutation in brushless DC motors. It integrates a Hall voltage generator, comparator, Schmitt trigger, and bandgap-regulated supply, operates from 4V to 24V, delivers 50mA sink current, and functions across –40°C to +150°C in TO-92S-3 package.

For engineers reviewing the AH41Z3-BG1 datasheet, AH41Z3-BG1 pinout, AH41Z3-BG1 application, or AH41Z3-BG1 equivalent, key selection criteria include magnetic operating point (BOP: 5–105 G), release point (BRP: –105 to –5 G), hysteresis (80–140 G), open-collector output behavior, and RoHS-compliant green packaging with "G1" suffix.

Technical Context

The AH41Z3-BG1 implements a bipolar latching function: a sufficient north pole turns the open-collector output low (ON), and it remains latched until a south pole of adequate strength releases it. Its internal bandgap regulator ensures stable operation across supply (4–24 V) and temperature (–40°C to 150°C).

Signal conditioning includes amplification of the Hall voltage, Schmitt-triggered switching for noise immunity, and output saturation voltage ≤300 mV at 20 mA. Magnetic thresholds are grade-dependent - this "B" grade offers BOP = 5–105 G and BRP = –105 to –5 G, yielding ≥80 G hysteresis.

Key Specifications

Pinout & Package

This device is housed in a low-profile TO-92S-3 plastic package with gull-wing leads, optimized for through-hole mounting and thermal dissipation in motor control PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bipolar latched Hall-effect sensor applications.

Compared with A3291LUA-T and US1881EUA-ABA-002-SP, AH41Z3-BG1 provides cost-optimized, grade-B magnetic performance in a proven TO-92S-3 footprint - ideal for volume BLDC motor designs where 5–105 G BOP and 150°C operation meet system requirements.

Availability

AH41Z3-BG1 is available at Aetrix Electronics and suitable for brushless DC motor commutation, rotary position feedback, and automotive throttle control requiring stable component supply, RoHS compliance, and long-term industrial availability.

Supply support for AH41Z3-BG1 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 China-based analog and mixed-signal IC designer and foundry partner, specializing in power management, motor control, and sensor solutions since 2003.

The AH41 series belongs to BCD's Hall-effect sensor product line, engineered specifically for robust, cost-effective rotor position detection in BLDC motors and industrial motion systems.

FAQ

What does the "BG1" suffix indicate in AH41Z3-BG1?

The "BG1" suffix denotes Grade B magnetic characteristics (BOP: 5–105 G, BRP: –105 to –5 G) and RoHS-compliant green packaging per EU Directive 2011/65/EU. The "G1" confirms lead-free finish and halogen-free molding compound, verified by BCD's material declarations.

Can AH41Z3-BG1 operate with a 3.3 V supply?

No. AH41Z3-BG1 requires a minimum supply voltage of 4 V per its Recommended Operating Conditions. At 3.3 V, internal bandgap regulation fails, causing unpredictable switching thresholds and potential output instability - use only within 4–24 V range.

Is an external pull-up resistor required on the OUTPUT pin?

Yes. The OUTPUT pin is open-collector; a pull-up resistor (typically 1–10 kΩ to VCC) is mandatory to establish a defined logic-high level when the output is inactive. Without it, the node floats and cannot interface reliably with CMOS or TTL inputs.

How does the AH41Z3-BG1 differ from unipolar Hall sensors?

AH41Z3-BG1 is bipolar and latching: it responds to both north and south magnetic poles and retains its output state until the opposite pole is applied. Unipolar sensors activate only with one pole and reset when the field is removed - making AH41Z3-BG1 suitable for position memory in rotating systems.