Diodes Incorporated AH3326-P-B

Overview

AH3326-P-B from Diodes Incorporated is a high-voltage, high-sensitivity Hall-effect unipolar switch IC designed for proximity and position sensing in consumer home appliances and industrial equipment. It operates from 3.0V to 28V, features open-drain output with 30–55mA current limiting, and delivers magnetic operate/release points of 65–135G / 50–120G (typ. 100G / 85G) with 15G hysteresis. Its chopper-stabilized architecture ensures stable switching across –40°C to +125°C.

For engineers reviewing the AH3326-P-B datasheet, AH3326-P-B pinout, AH3326-P-B application, or AH3326-P-B equivalent, key selection criteria include its SIP-3 (Bulk Pack) package, south-pole activation polarity, 0.2–0.4V output saturation voltage at 20mA, 8kV HBM ESD rating, and compatibility with 3–28V supply rails in contactless switch designs.

Technical Context

The AH3326-P-B implements a chopper-stabilized Hall sensor with dynamic offset cancellation, delivering superior temperature stability and minimal switch-point drift over –40°C to +125°C. Its internal bandgap regulator supplies temperature-compensated bias to analog circuitry, enabling consistent BOP/BRP performance across voltage (3–28V) and temperature extremes.

It integrates reverse-blocking diode protection, zener clamps on VDD and OUTPUT pins, and output overcurrent limiting (30–55mA). The single open-drain output switches low when perpendicular magnetic flux exceeds BOP (100G typ.), remains latched until flux drops below BRP (85G typ.), and requires external pull-up for logic-level interfacing.

Key Specifications

Pinout & Package

AH3326-P-B uses the SIP-3 (Bulk Pack) package - a 3-pin, straight-lead, surface-mount package with 2.54mm pitch, optimized for automated bulk handling and wave soldering in high-volume appliance manufacturing.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar unipolar Hall switch applications.

Compared with A3212LLHLT-T and US1881EUA-ABA-002-SP, AH3326-P-B uniquely combines 28V operation, SIP-3 bulk packaging, and 100G sensitivity - making it optimal for high-volume, high-reliability appliance production where supply margin, assembly efficiency, and magnetic design flexibility are critical.

Availability

AH3326-P-B is available at Aetrix Electronics and suitable for washing machine lid detection, dishwasher door sensing, industrial flow metering, and BLDC motor commutation requiring stable component supply across automotive-adjacent industrial programs.

Supply support for AH3326-P-B 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 semiconductor company specializing in discrete, analog, and mixed-signal solutions for industrial, consumer, computing, and communications markets.

AH3326-P-B belongs to the AH332X high-voltage Hall-effect switch family, engineered specifically for robust, maintenance-free position and proximity sensing in harsh ambient conditions and high-volume white-goods manufacturing.

FAQ

What magnetic polarity activates the AH3326-P-B?

The AH3326-P-B is a unipolar switch activated exclusively by the south pole of a magnet. For the SIP-3 (Bulk Pack) variant, the south pole must be presented to the part-marking side of the package. This polarity requirement is fixed and cannot be reversed via configuration or external circuitry.

Does AH3326-P-B require an external pull-up resistor?

Yes - AH3326-P-B has an open-drain output and requires an external pull-up resistor (typically 1kΩ–10kΩ) between VDD and the OUTPUT pin to generate a valid logic-high level when the output is inactive. Without it, the output remains floating and undefined.

Can AH3326-P-B operate directly from a 24V industrial rail?

Yes - AH3326-P-B is rated for continuous operation from 3.0V to 28V. Its internal zener clamp and reverse-blocking diode protect against transient overvoltage and reverse connection, making it suitable for direct connection to nominal 24V systems without external regulation or protection components.

Is AH3326-P-B pin-compatible with other AH332X variants?

Yes - all AH332X variants (AH3322, AH3323, AH3326, AH3327) share identical SIP-3, SOT23, SC59, and packaging pinouts. Only magnetic thresholds differ; electrical interface, supply behavior, and timing characteristics are fully interchangeable within the same package type.