Diodes Incorporated AH3323-W-7

Overview

AH3323-W-7 from Diodes Incorporated is a high-voltage, high-sensitivity Hall-effect unipolar switch IC in SC59 package, designed for proximity and position sensing in home appliances and industrial equipment. It operates from 3.0V to 28V, features open-drain output with 30–55mA current limit, BOP of 38–72G and BRP of 20–50G, and delivers reliable switching under -40°C to +125°C ambient conditions.

For engineers reviewing the AH3323-W-7 datasheet, AH3323-W-7 pinout, AH3323-W-7 application, or AH3323-W-7 equivalent, key selection considerations include magnetic sensitivity thresholds (BOP/BRP), supply voltage range compatibility, SC59 package thermal derating, and south-pole activation polarity relative to part marking side.

Technical Context

The AH3323-W-7 uses chopper-stabilized architecture with dynamic offset cancellation to minimize temperature-induced switch point drift and enhance immunity to mechanical stress and RF noise. Its internal bandgap regulator provides temperature-compensated biasing across the full operating range.

It implements unipolar switching logic: output pulls low when perpendicular magnetic flux density exceeds BOP (38–72G), remains latched until flux drops below BRP (20–50G), with hysteresis of 14–26G. The SC59 package requires south pole applied to the non-marking side for activation.

Key Specifications

Pinout & Package

Package: SC59 - surface-mount, 3-pin, single-ended Hall sensor package with exposed die pad for thermal conduction; footprint compatible with JEDEC TO-92 variant layouts but optimized for automated placement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AL3323W-7 and US1881LUA-AAA-000, the AH3323-W-7 uniquely combines 28V operation, integrated reverse-blocking diode, and SC59 thermal performance (230mW @25°C), making it optimal for cost-sensitive industrial mains-powered systems where robustness and wide voltage margin are prioritized over automotive qualification or sub-2mA quiescent current.

Availability

AH3323-W-7 is available at Aetrix Electronics and suitable for home appliance door detection, industrial flow metering, office equipment jam sensing, and building automation window tilt monitoring requiring stable component supply across extended temperature and voltage ranges.

Supply support for AH3323-W-7 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.

The AH332X series belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust, high-voltage unipolar switching in cost-sensitive, thermally demanding applications such as white goods and factory automation.

FAQ

What is the correct magnet polarity and orientation for activating AH3323-W-7?

The AH3323-W-7 in SC59 package requires a South pole applied to the non-part-marking side of the package to activate. This is explicitly defined in the datasheet's magnetic characteristics section and differs from SOT23/SIP-3 variants, which require South pole on the marking side. Misalignment causes failure to switch.

Does AH3323-W-7 require an external bypass capacitor?

Yes - a 10nF to 100nF ceramic capacitor (CIN) between VDD and GND is recommended per the Typical Applications Circuit. It stabilizes the internal bandgap regulator and improves noise immunity, especially in electrically noisy environments like motor-driven appliances.

Can AH3323-W-7 drive a relay coil directly?

No - its 55mA maximum output current is insufficient for most relay coils (typically 50–200mA). It must interface through a transistor driver or logic-level MOSFET. The open-drain output is intended for signaling, not power switching, and exceeding IOCL risks permanent damage.

How does temperature affect the magnetic operate point (BOP) of AH3323-W-7?

BOP shifts by less than ±0.5G/°C across -40°C to +125°C due to chopper stabilization and internal bandgap compensation. At 125°C, BOP remains within 38–72G (typical 55G), ensuring consistent detection margins in hot environments like oven control panels or motor enclosures.