Diodes Incorporated AH3322-P-B

Overview

AH3322-P-B from Diodes Incorporated is a high-voltage, high-sensitivity Hall-effect unipolar switch IC designed for proximity and position sensing in home appliances and industrial equipment. It operates from 3.0V to 28V, features open-drain output with 60mA continuous current rating, BOP/BRP of 15–45G/5–35G (typical 30G/20G), and functions reliably across –40°C to +125°C ambient temperature.

For engineers reviewing the AH3322-P-B datasheet, AH3322-P-B pinout, AH3322-P-B application, or AH3322-P-B equivalent, key selection criteria include magnetic sensitivity thresholds, supply voltage range compatibility, open-drain drive capability, thermal derating in SIP-3 bulk packaging, and polarity-dependent activation geometry relative to package marking side.

Technical Context

The AH3322-P-B implements chopper-stabilized architecture with dynamic offset cancellation to minimize switch-point drift over temperature and supply voltage. Its internal bandgap regulator provides temperature-compensated biasing for analog front-end circuitry, enabling stable operation across the full –40°C to +125°C range.

Magnetic actuation is unipolar and polarity-sensitive: for SIP-3 (Bulk Pack) packages like AH3322-P-B, a South pole applied to the part-marking side triggers turn-on (B > BOP ≈ 30G), and release occurs when flux drops below BRP ≈ 20G, with 10G typical hysteresis. The device includes reverse-blocking diode, supply/output zener clamps, and output overcurrent limiting at 30–55mA.

Key Specifications

Pinout & Package

SIP-3 (Bulk Pack) is a 3-pin straight-lead surface-mount package with 2.54mm pitch, optimized for automated insertion and high-reliability mounting in vibration-prone appliances and industrial controls.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AL3322S-30-TB and US1881LUA-AB3-A, AH3322-P-B delivers superior system-level ruggedness through integrated 28V zener clamps, reverse-blocking diode, and 550mW SIP-3 thermal capacity-making it the preferred choice for 12V/24V industrial and appliance applications demanding long-term reliability without external protection.

Availability

AH3322-P-B is available at Aetrix Electronics and suitable for home appliance door sensing, industrial flow meter detection, office equipment paper jam detection, and building automation window position monitoring requiring stable component supply across extended temperature and voltage ranges.

Supply support for AH3322-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, application-optimized components for industrial, automotive, and consumer markets.

AH3322-P-B belongs to the AH332X family of high-voltage Hall-effect switches, engineered specifically for robust, maintenance-free position and proximity sensing in harsh environments where wide supply range, thermal stability, and integrated protection are mandatory.

FAQ

What magnetic polarity activates the AH3322-P-B in its SIP-3 (Bulk Pack) configuration?

For AH3322-P-B (SIP-3 Bulk Pack), a South pole applied to the part-marking side triggers output turn-on when magnetic flux density exceeds BOP (15–45G). This polarity orientation is fixed per package type and differs from SC59, which requires South pole on the non-marking side. Confirm orientation using the top-view marking diagram in DS46151 Rev. 2–2, page 5.

Can AH3322-P-B operate directly from a 24V industrial rail without external regulation?

Yes. AH3322-P-B is rated for 3.0V to 28V continuous supply operation and includes an internal bandgap regulator and supply zener clamp (28V), enabling direct connection to 24V systems. Its 550mW power dissipation at 25°C ambient supports this use case, though thermal derating must be applied above 85°C ambient per the curve on page 12 of DS46151.

Does AH3322-P-B require an external capacitor on the VDD pin?

Yes. A 10nF to 100nF ceramic decoupling capacitor (CIN) is recommended between VDD and GND, as specified in the Typical Applications Circuit (DS46151 Rev. 2–2, page 3). This stabilizes the internal regulator and enhances RF noise immunity-omitting it may cause erratic switching or increased susceptibility to conducted transients.

How does the output current limit function, and what is its trip threshold?

AH3322-P-B limits output sink current to 30–55mA (typ. 42.5mA) when B > BOP, as defined by IOCL in the Electrical Characteristics table (page 3). This internal current-limiting protects the output transistor during short-circuit or excessive load conditions and eliminates need for external current-limiting resistors in most designs.