Diodes Incorporated AH3323-P-A

Overview

AH3323-P-A 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, BOP/BRP of 38–72G/20–50G typical, and functions reliably across –40°C to +125°C.

For engineers reviewing the AH3323-P-A datasheet, AH3323-P-A pinout, AH3323-P-A application, or AH3323-P-A equivalent, key selection criteria include magnetic sensitivity thresholds (BOP/BRP), supply voltage range, open-drain drive capability, thermal derating curves for SIP-3 package, and polarity-dependent activation side per package type.

Technical Context

The AH3323-P-A uses chopper-stabilized architecture with dynamic offset cancellation to achieve minimal switch-point drift (<10G hysteresis) and superior temperature stability over –40°C to +125°C. Its internal bandgap regulator supplies temperature-compensated bias to analog circuitry, enabling consistent operation across full 3.0–28V supply range.

It integrates reverse-blocking diode and zener clamps on both VDD and OUTPUT pins for robustness. The single open-drain output switches low when South-pole magnetic flux exceeds BOP (38–72G), remains latched until flux drops below BRP (20–50G), with polarity orientation dependent on package marking side.

Key Specifications

Pinout & Package

Package: SIP-3 (Ammo Pack), 3-pin surface-mount package with spread leads, RoHS-compliant, lead-free, halogen-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AH3323-P-A, A3212 offers lower sensitivity and narrower voltage range, limiting robustness in high-noise 24V systems; US1881 provides integrated decoupling but omits critical output clamping, increasing external component count for industrial reliability.

Availability

AH3323-P-A is available at Aetrix Electronics and suitable for appliance lid detection, industrial flow metering, office equipment sensing, and building automation window position monitoring requiring stable component supply across extended temperature and voltage ranges.

Supply support for AH3323-P-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, specializing in high-reliability power management, signal integrity, and sensing solutions for industrial and consumer markets.

AH3323-P-A belongs to the AH332X high-voltage Hall-effect switch family, engineered specifically for robust proximity and position sensing in harsh environments where wide supply range, thermal stability, and integrated protection are mandatory.

FAQ

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

The AH3323-P-A in SIP-3 (Ammo Pack) package requires a South pole applied to the part-marking side to activate. This is confirmed in the datasheet's magnetic characteristics table and pin diagram notes - incorrect polarity orientation results in no output switching. Polarity direction is reversed for SC59 packages, but AH3323-P-A uses SIP-3.

Can AH3323-P-A operate directly from a 24V DC rail without external regulation?

Yes. AH3323-P-A is rated for continuous operation from 3.0V to 28V, with absolute maximum VDD of 32V. Its internal bandgap regulator and chopper-stabilized core enable stable function at 24V without external LDO or Zener, and the integrated zener clamp protects against transients up to 28V.

Does AH3323-P-A require an external bypass capacitor?

Yes. A 10nF–100nF ceramic capacitor (CIN) between VDD and GND is required for power stabilization and enhanced noise immunity, as specified in the Typical Applications Circuit and Notes section. Omitting CIN risks erratic switching under EMI or supply ripple, especially in motor-driven or switching-power-supply environments.

How does thermal derating affect AH3323-P-A's power dissipation in SIP-3 package?

In SIP-3 (Ammo Pack), AH3323-P-A's power dissipation derates linearly from 550mW at 25°C to 0mW at 150°C. At 85°C ambient, maximum dissipation is ~286mW - sufficient for typical 3mA supply current and 20mA output sink (0.4V × 20mA = 8mW), leaving ample margin for long-term reliability in enclosed housings.