Diodes Incorporated AH3323-P-B

Overview

AH3323-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 BOP/BRP of 38–72G/20–50G typical over –40°C to +125°C. Its chopper-stabilized architecture ensures <10µs response time and minimal thermal drift in contactless switch applications.

For engineers reviewing the AH3323-P-B datasheet, AH3323-P-B pinout, AH3323-P-B application, or AH3323-P-B equivalent, key selection criteria include magnetic sensitivity thresholds (BOP = 55G typ), supply voltage range (3–28V), open-drain output drive capability, thermal stability across –40°C to +125°C, and SIP-3 bulk-pack compatibility for high-volume assembly.

Technical Context

The AH3323-P-B implements a chopper-stabilized Hall sensor with dynamic offset cancellation, delivering stable switching points across temperature and supply voltage variations. Its internal bandgap regulator supplies temperature-compensated bias to analog circuitry, enabling ±10G hysteresis (BHY) and <0.4V output saturation at 20mA load.

It integrates reverse-blocking diode protection, zener clamps on VDD and OUTPUT pins, and overcurrent limiting-enabling robust operation in noisy, high-voltage industrial environments. Magnetic polarity response is package-dependent: south pole activation occurs on the part-marking side for SIP-3 (Bulk Pack) and SOT23 (Type S), but opposite for SC59.

Key Specifications

Pinout & Package

SIP-3 (Bulk Pack) package: 3-pin straight-lead surface-mount package with 2.54mm pitch, optimized for automated bulk handling and wave soldering. Pin 1 = VDD, Pin 2 = GND, Pin 3 = OUTPUT.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AL3323Q-S01-T, AH3323-P-B offers lower cost and broader industrial qualification, while US1881LUA-AB trades protection features for reduced bill-of-materials cost-making AH3323-P-B optimal for 24V industrial sensing where robustness and SIP-3 bulk logistics matter.

Availability

AH3323-P-B is available at Aetrix Electronics and suitable for consumer appliance door detection, industrial flow metering, office equipment position sensing, and building automation level detection requiring stable component supply across long production lifecycles.

Supply support for AH3323-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 manufacturer specializing in discrete, analog, and mixed-signal solutions for industrial, computing, and consumer markets.

The AH332X series belongs to Diodes' high-voltage Hall-effect sensor product line, engineered specifically for robust, maintenance-free proximity and position sensing in harsh environments with wide supply voltage and temperature ranges.

FAQ

What is the magnetic polarity requirement for AH3323-P-B activation?

The AH3323-P-B uses SIP-3 (Bulk Pack) packaging, which requires a south magnetic pole applied to the part-marking side to activate the output. This is confirmed in the datasheet's magnetic polarity diagram and differs from SC59 packages, where the south pole must approach the non-marking side. Polarity misalignment causes failure to switch.

Can AH3323-P-B operate directly from a 24V supply without external regulation?

Yes. The device is rated for 3.0V to 28V continuous operation and includes an internal zener clamp on the VDD pin with 32V absolute maximum transient rating. It draws only 3–5mA supply current across temperature, eliminating need for external LDO or resistor-divider networks in 24V systems.

Does AH3323-P-B require an external capacitor on the VDD pin?

Yes. A 10nF–100nF ceramic decoupling capacitor (CIN) is required between VDD and GND per the Typical Applications Circuit. This stabilizes the internal bandgap regulator and enhances RF noise immunity-omission risks erratic switching or increased susceptibility to EMI in motor-driven environments.

Is AH3323-P-B pin-compatible with other AH332X variants like AH3322-P-B?

Yes. All AH332X variants-including AH3322-P-B, AH3323-P-B, AH3326-P-B, and AH3327-P-B-share identical SIP-3 (Bulk Pack) pinout (VDD-GND-OUTPUT), same footprint, and identical electrical interface. Only magnetic sensitivity (BOP/BRP) differs; no layout change is needed when upgrading sensitivity grades.