Diodes Incorporated AH266K-PG-B-A

Overview

AH266K-PG-B-A from Diodes Incorporated is a high-voltage Hall-effect latch IC designed for electronic commutation in brushless DC motors. It integrates a Hall plate, amplifier, Schmitt trigger, and complementary Darlington open-collector drivers (DO/DOB), operates from 4V to 28V, delivers 400mA continuous output current at +25°C, and functions across –20°C to +85°C - deployed in dual-coil BLDC fans and motor timing systems.

For engineers reviewing the AH266K-PG-B-A datasheet, AH266K-PG-B-A pinout, AH266K-PG-B-A application, or AH266K-PG-B-A equivalent, key selection considerations include magnetic operating point (Bop ≤ 70 G), release point (Brp ≥ –70 G), output saturation voltage (VCE(SAT) ≤ 1.5 V @ 400 mA), Zener breakdown protection (VZ = 62 V typ.), and SIP-4 package thermal resistance (θJA = 227 °C/W).

Technical Context

The AH266 implements a latching Hall sensor architecture with built-in band-gap regulation for supply stability and temperature compensation. Its dual open-collector outputs (DO and DOB) provide complementary switching states triggered by magnetic flux polarity and magnitude relative to Bop and Brp thresholds.

Switching hysteresis (Bhy = 80 G typical) ensures noise immunity in electrically noisy motor environments. Output stage uses Darlington pairs enabling 400 mA sink capability while maintaining low saturation voltage (1.1 V typ. at 24 V, 400 mA) and integrated 62 V Zener clamp for transient overvoltage protection.

Key Specifications

Pinout & Package

Supplied in a rugged, lead-free, halogen-free SIP-4 package (14.3 mm × 3.65 mm × 1.55 mm) with gull-wing leads and green molding compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with A3291L and US1881E, AH266K-PG-B-A uniquely combines latched bipolar switching, dual complementary outputs, 28 V tolerance, and SIP-4 mechanical robustness - making it the only option among the three qualified for direct 2-phase BLDC motor drive in cost-sensitive, high-reliability fan and pump modules.

Availability

AH266K-PG-B-A is available at Aetrix Electronics and suitable for brushless DC fan control, dual-coil motor commutation, revolution counting, and speed measurement requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for AH266K-PG-B-A 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

AH266 belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust, low-cost electronic commutation in BLDC motors and motion-sensing applications where reliability under voltage transients and thermal stress is critical.

FAQ

What is the magnetic sensitivity grade of AH266K-PG-B-A?

The AH266K-PG-B-A is an A-grade device with magnetic operate point (Bop) ranging from 10 G to 70 G and release point (Brp) from –70 G to –10 G, yielding 80 G typical hysteresis. This grade is optimized for use with standard ferrite magnets in BLDC fan and motor applications where moderate air gap tolerance and noise immunity are required.

Can AH266K-PG-B-A drive motor coils directly?

No - AH266K-PG-B-A provides open-collector Darlington outputs rated for 400 mA continuous sink current, but it lacks the voltage headroom and current capacity to drive typical BLDC motor windings directly. It is intended to drive the gates of external N-channel MOSFETs or IGBTs in half-bridge configurations, as shown in Diodes' typical application circuits.

Is reverse polarity protection built-in?

AH266K-PG-B-A includes an internal reverse protection diode only for chip-level reverse power connection (Note 1 in datasheet); this does not protect against reverse coil current or back-EMF from motor windings. External reverse-battery protection (e.g., series MOSFET or diode) is required if system-level reverse voltage exposure is possible.

What is the meaning of the "-B-A" suffix in AH266K-PG-B-A?

The "-B" denotes magnetic grade B (higher Bop up to 100 G), and "-A" indicates tape-and-reel packaging per Diodes' ordering convention. However, per the datasheet's Ordering Information table, AH266K-PG-B-A corresponds to SIP-4 bulk packaging (1000 pcs), with "-A" specifying the A-grade magnetic characteristics - confirming this unit is A-grade, not B-grade, despite the "B" in the suffix.