Diodes Incorporated AH3524A-P-B

Overview

AH3524A-P-B from Diodes Incorporated is a high-voltage, high-sensitivity Hall-effect omnipolar switch IC with internal pullup resistor, designed for contactless position and proximity sensing in industrial appliances and personal care devices. It operates from 3.0V to 28V, features ±40G typical operate point (BOP), ±25G typical release point (BRP), and delivers <0.4V output on-voltage at 20mA load across –40°C to +125°C.

For engineers reviewing the AH3524A datasheet, AH3524A pinout, AH3524A application, or AH3524A equivalent, this device supports robust magnetic switching in noisy environments, offers built-in overcurrent protection and Zener clamping on supply/output pins, and enables direct interface with microcontrollers without external pullup resistors.

Technical Context

The AH3524A employs chopper-stabilized architecture with dynamic offset cancellation to suppress thermal drift and mechanical stress effects, ensuring stable BOP/BRP thresholds across temperature and package strain. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, enabling consistent operation from –40°C to +125°C.

It integrates a reverse-blocking diode and Zener clamp on VDD, plus output overcurrent limiting (30–55mA) and Zener clamping on OUTPUT. The internally pulled-up open-drain output switches low when |B| exceeds BOP and remains latched until |B| falls below BRP-supporting both North and South pole actuation.

Key Specifications

Pinout & Package

Package: SIP-3 (Bulk Pack), 3-pin single-inline package with straight leads, 14.5 mm body length, RoHS-compliant matte tin plating, and 0.077 g mass.

Key Features

Applications

Equivalent & Alternatives

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

Compared with US1881 and A1120EUA-T, the AH3524A uniquely combines 28V operation, internal pullup, output current limiting, and full industrial temperature support - reducing BOM count and improving system-level reliability in demanding home appliance designs.

Availability

AH3524A-P-B is available at Aetrix Electronics and suitable for washing machine lid detection, electric toothbrush position sensing, industrial flow meter rotor counting, and smart appliance door interlock requiring stable component supply across extended temperature and voltage ranges.

Supply support for AH3524A-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 company specializing in discrete, analog, and mixed-signal solutions for industrial, computing, consumer, and communications markets.

The AH3524A belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust, maintenance-free position and proximity sensing in high-humidity, high-vibration, and wide-voltage industrial and home appliance environments.

FAQ

What is the function of the internal pullup resistor in AH3524A-P-B?

The internal pullup resistor (10–18 kΩ) ensures the OUTPUT pin defaults to a logic-high state when inactive, eliminating the need for an external pullup. This simplifies PCB layout, reduces component count, and guarantees reliable interfacing with standard CMOS/TTL inputs across the full –40°C to +125°C range without drift-induced logic errors.

Can AH3524A-P-B operate directly from a 24V supply without external regulation?

Yes - the AH3524A-P-B is rated for continuous operation from 3.0V to 28V, with internal bandgap regulation and Zener clamping on VDD. It sustains full functionality at 24V without external LDO or TVS, making it ideal for direct connection to unregulated industrial power rails while maintaining stable magnetic thresholds and output performance.

How does the chopper-stabilized architecture improve performance?

Chopper stabilization dynamically cancels offset voltage in the Hall sensor amplifier using a 500kHz modulation scheme. This reduces thermal drift of BOP/BRP to less than ±0.5G/°C and minimizes sensitivity loss under mechanical stress - critical for long-term reliability in sealed motor housings and vibrating appliance enclosures.

Is AH3524A-P-B suitable for automotive applications?

No - AH3524A-P-B is not AEC-Q100 qualified and lacks PPAP documentation or IATF 16949 manufacturing certification. While it operates across –40°C to +125°C, Diodes explicitly states that automotive-grade variants require separate qualification; this part is intended for industrial and consumer appliance use only.