Diodes Incorporated AH3522-SA-7

Overview

AH3522-SA-7 from Diodes Incorporated is a high-voltage, high-sensitivity Hall-effect omnipolar switch IC in SOT23 (Type S) package, designed for contactless position and proximity sensing in home appliances and industrial equipment. It operates from 3.0V to 28V, features ±20G typical operate point (BOP), open-drain output with 30–55mA current limit, and functions reliably from –40°C to +125°C.

For engineers reviewing the AH3522-SA-7 datasheet, AH3522-SA-7 pinout, AH3522-SA-7 application, or AH3522-SA-7 equivalent, key selection criteria include magnetic sensitivity range (±8G to ±30G), chopper-stabilized architecture for thermal stability, integrated Zener clamps on VDD and OUTPUT, reverse blocking diode, and ESD robustness (8kV HBM).

Technical Context

The AH3522-SA-7 uses a chopper-stabilized architecture with dynamic offset cancellation to minimize switch-point drift over temperature and stress. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, enabling stable operation across –40°C to +125°C ambient.

It implements an omnipolar detection scheme: output turns ON (low) when either South or North pole exceeds BOP (±8G to ±30G), and remains latched until flux drops below BRP (±2G to ±25G). The single open-drain output includes overcurrent limiting (30–55mA) and Zener clamping (28V) for robustness against transients and ESD.

Key Specifications

Pinout & Package

SOT23 (Type S) surface-mount package with 3-pin configuration, JEDEC-compliant footprint, matte tin-plated leads, and moisture sensitivity level 1 per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AL3522SCTR and US1881EUA-AM, the AH3522-SA-7 uniquely combines 28V operation, –40°C to +125°C rating, integrated reverse-blocking diode, and dual Zener clamps-enabling single-component solutions in harsh, wide-input industrial sensing nodes.

Availability

AH3522-SA-7 is available at Aetrix Electronics and suitable for washing machine lid detection, industrial conveyor position sensing, smart thermostat air filter monitoring, and flow meter impeller detection requiring stable component supply across automotive, industrial, and white-goods production programs.

Supply support for AH3522-SA-7 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 devices for industrial, computing, consumer, and communications markets.

The AH3522-SA-7 belongs to Diodes' high-voltage Hall-effect switch product line, engineered specifically for robust, maintenance-free position and proximity sensing in electrically noisy, thermally demanding environments.

FAQ

What is the magnetic polarity requirement for AH3522-SA-7 actuation?

The AH3522-SA-7 is an omnipolar Hall switch: it activates when either the South pole (BOPS = +8G to +30G) or North pole (BOPN = –30G to –8G) exceeds its operate point. No magnet polarity orientation is required-simplifying mechanical integration and reducing assembly cost in mass-produced appliances.

Does AH3522-SA-7 require an external pull-up resistor?

Yes. The AH3522-SA-7 has an open-drain output and must be used with an external pull-up resistor (RL) to VDD or another logic rail. Recommended RL values range from 1kΩ to 10kΩ depending on rise time and power requirements; a 10nF–100nF bypass capacitor (CIN) on VDD is also recommended for noise immunity.

Can AH3522-SA-7 withstand reverse supply voltage?

Yes. The device integrates a reverse-blocking diode and is rated for –18V reverse supply voltage (VDDR). This protects against accidental reverse-battery connection in 12V/24V systems, eliminating the need for an external series diode in many industrial and appliance designs.

How does the chopper stabilization improve performance over conventional Hall switches?

Chopper stabilization dynamically cancels offset voltage drift caused by temperature gradients and mechanical stress. In the AH3522-SA-7, this reduces BOP/BRP drift to <±0.1G/°C and enables stable switching across –40°C to +125°C-critical for outdoor equipment, motor controls, and sealed industrial enclosures where thermal cycling is unavoidable.