Diodes Incorporated AH3574-P-A

Overview

AH3574-P-A from Diodes Incorporated is a high-voltage, high-sensitivity Hall effect omnipolar switch IC designed for magnetic proximity and position sensing in industrial and consumer systems. It operates from 3.0V to 28V, features ±40G typical operate point (BOP), ±25G typical release point (BRP), and delivers robust open-drain switching with overcurrent protection - used in contactless switches for home appliance door detection.

For engineers reviewing the AH3574-P-A datasheet, AH3574-P-A pinout, AH3574-P-A application, or AH3574-P-A equivalent, this device supports wide-voltage operation, chopper-stabilized temperature stability, reverse-battery protection, and ESD immunity >6kV - critical for reliable sensing in noisy, thermally variable environments.

Technical Context

The AH3574 employs chopper-stabilized architecture with dynamic offset cancellation to suppress thermal drift and mechanical stress-induced errors. Its internal bandgap regulator supplies temperature-compensated biasing across -40°C to +125°C, enabling stable BOP/BRP thresholds independent of supply voltage variation.

It integrates reverse-blocking diode and Zener clamps on both VDD and OUTPUT pins, supporting fault-tolerant operation under reverse battery (-28V) and transient overvoltage conditions. The single open-drain output is activated by either magnetic polarity, with hysteresis of 15G typical to prevent chatter near threshold.

Key Specifications

Pinout & Package

Available in SIP-3 (Ammo Pack) package - surface-mount, 3-pin single-inline package with spread leads for manual or pick-and-place assembly. Pin 1 = VDD, Pin 2 = GND, Pin 3 = OUTPUT.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AL3505-30D and TLE4913-2K, the AH3574-P-A uniquely combines 28V operation, reverse-battery tolerance, output Zener clamping, and ±40G sensitivity - making it optimal for industrial appliances requiring fault resilience and high magnetic responsiveness without external protection components.

Availability

AH3574-P-A is available at Aetrix Electronics and suitable for home appliance door sensing, industrial flow meter detection, office equipment paper jam detection, and smart building window position feedback requiring stable component supply across extended temperature and voltage ranges.

Supply support for AH3574-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, application-optimized components for industrial, automotive, and consumer markets.

The AH3574 belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust, maintenance-free position and proximity sensing in electrically noisy, thermally demanding environments - emphasizing fault tolerance, wide supply range, and magnetic consistency.

FAQ

What is the magnetic polarity requirement for AH3574-P-A activation?

The AH3574-P-A is an omnipolar Hall switch: it activates with either the South or North pole presented to the marked side of the package. Typical operate points are +40G (South) and -40G (North) at 25°C, enabling flexible magnet placement without polarity alignment constraints in mechanical designs.

Does AH3574-P-A require an external pull-up resistor?

Yes - the AH3574-P-A features an open-drain output that must be pulled up externally. A 1kΩ to 10kΩ resistor to VDD is recommended; the datasheet specifies RL = 1kΩ for timing characterization. Pull-up value affects rise time and power consumption but does not impact magnetic switching thresholds.

Can AH3574-P-A operate from a 3.3V logic rail?

Yes - the device is fully specified from 3.0V to 28V. At 3.3V, it maintains functional operation including ±40G BOP, 10µs start-up, and output saturation voltage <0.4V at 20mA. However, output current limit decreases slightly at lower voltages; verify load compatibility per Electrical Characteristics table.

Is AH3574-P-A pin-compatible with other Diodes Hall switches like AH180x series?

No - AH3574-P-A uses SIP-3 (3-pin single-inline) packaging with pinout VDD-GND-OUTPUT, whereas AH180x devices use SOT23-3 with VDD-OUTPUT-GND arrangement. Mechanical and electrical pin mapping differs; direct replacement requires PCB layout revision and validation of magnetic field orientation relative to package marking.