Diodes Incorporated AH3522-P-A

Overview

AH3522-P-A from Diodes Incorporated is a high-voltage, high-sensitivity Hall-effect omnipolar switch IC designed for proximity and position sensing in home appliances and industrial equipment. It operates from 3.0V to 28V, features ±20G to ±40G operate/release points, open-drain output with 60mA continuous current rating, and -40°C to +125°C operating temperature range.

For engineers reviewing the AH3522-P-A datasheet, AH3522-P-A pinout, AH3522-P-A application, or AH3522-P-A equivalent, key selection criteria include magnetic sensitivity (BOP/BRP), supply voltage range, output current limit, ESD robustness (8kV HBM), and SIP-3 package compatibility with through-hole mounting.

Technical Context

The AH3522-P-A uses chopper-stabilized architecture with dynamic offset cancellation to minimize thermal drift and mechanical stress effects on switching thresholds. Its internal bandgap regulator provides temperature-compensated biasing across the full -40°C to +125°C range.

Omnipolar operation enables activation by either South or North magnetic pole orientation perpendicular to the package surface. The device integrates reverse-blocking diode, Zener clamps on VDD and OUTPUT pins, and output overcurrent limiting (30–55mA) for system-level protection.

Key Specifications

Pinout & Package

Package: SIP-3 (Ammo Pack) - 3-pin single-inline package with straight leads, optimized for automated through-hole insertion and high-reliability industrial mounting.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Hall-effect omnipolar switch applications.

Compared with A3212LLHLT-T and US1881EUA-ABA-002-SP, AH3522-P-A uniquely supports 28V operation and offers superior thermal stability (chopper-stabilized) while maintaining SIP-3 through-hole compatibility - making it optimal for high-voltage industrial position sensing where reliability across temperature extremes is mandatory.

Availability

AH3522-P-A is available at Aetrix Electronics and suitable for home appliance door detection, industrial flow metering, office equipment jam sensing, and smart building occupancy monitoring requiring stable component supply across extended temperature and voltage ranges.

Supply support for AH3522-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations worldwide.

The AH3522 series belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust, maintenance-free position and proximity sensing in cost-sensitive, high-volume industrial and consumer applications.

FAQ

What is the magnetic polarity requirement for AH3522-P-A activation?

The AH3522-P-A is an omnipolar Hall switch, meaning it activates with either a South or North magnetic pole oriented perpendicular to the marked surface of the SIP-3 package. No polarity-specific magnet orientation is required - simplifying mechanical design and reducing assembly error risk in high-volume production.

Can AH3522-P-A be used with a 24V PLC input module?

Yes. With its 3.0V–28V supply range and open-drain output rated for up to 32V off-state voltage, AH3522-P-A interfaces directly with standard 24V PLC digital inputs. An external pull-up resistor to 24V is required; the integrated Zener clamp protects the output pin from overvoltage transients.

Does AH3522-P-A require an external capacitor on VDD?

Yes. A 10nF–100nF ceramic decoupling capacitor (CIN) is recommended between VDD and GND per the datasheet to stabilize the internal regulator and improve RF noise immunity. This capacitor must be placed close to the SIP-3 pins to ensure reliable operation in electrically noisy industrial environments.

How does the chopper stabilization in AH3522-P-A improve performance over basic Hall switches?

Chopper stabilization actively cancels offset voltage drift caused by temperature gradients and mechanical stress. In AH3522-P-A, this delivers <±0.5G/°C operate point drift versus >±2G/°C in non-chopped devices - ensuring consistent switching thresholds from -40°C to +125°C without calibration or compensation firmware.