Diodes Incorporated AH3722A-P-A

Overview

AH3722A-P-A from Diodes Incorporated is a high-voltage, high-sensitivity bipolar Hall-effect latch IC with integrated pullup resistor, designed for brushless DC motor commutation and position sensing in industrial and consumer appliances. It operates from 3.0V to 28V, features BOP/BRP of 10–40G / –40G to –10G, delivers <0.4V output saturation at 20mA, and supports –40°C to +125°C ambient operation.

For engineers reviewing the AH3722A-P-A datasheet, AH3722A-P-A pinout, AH3722A-P-A application, or AH3722A-P-A equivalent, this device is selected for robust magnetic switching in high-temperature, wide-supply environments where internal pullup simplifies PCB routing and chopper stabilization ensures minimal thermal drift in motor control feedback loops.

Technical Context

The AH3722A-P-A uses chopper-stabilized architecture with dynamic offset cancellation and an internal bandgap regulator to deliver temperature-compensated operation across –40°C to +125°C. Its bipolar latch behavior requires South pole activation (B > +10G) and North pole deactivation (B < –10G), with hysteresis of 20–80G ensuring noise immunity in electrically noisy motor drive environments.

Protection includes Zener clamping on VDD (28V typical), output overcurrent limiting (30–55mA), and reverse-blocking diode integration. The internally pulled-up open-drain output switches low when latched, eliminating external pullup components in RPM sensing and encoder applications.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with AH3722A-P-A, AL3722QSA-7 adds automotive qualification at higher cost and looser sensitivity, while US1881EUA-AAA-000 sacrifices integration and package compatibility for broader ESD margin and lower voltage operation.

Availability

AH3722A-P-A is available at Aetrix Electronics and suitable for brushless DC motor commutation, flow metering, linear encoding, and contactless position sensing requiring stable component supply across industrial and consumer appliance programs.

Supply support for AH3722A-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and sensing applications.

AH3722A-P-A belongs to Diodes' Hall-effect sensor product line, engineered for high-reliability magnetic position detection in harsh thermal and electrical environments found in motor control and industrial automation.

FAQ

What is the magnetic polarity requirement for AH3722A-P-A operation?

The AH3722A-P-A is a bipolar latch: it turns ON (output low) when exposed to a South pole exceeding +10G at the marked surface, and remains latched until a North pole stronger than –10G is applied to release it. This polarity-specific behavior enables unambiguous direction detection in rotary encoders and BLDC commutation.

Can AH3722A-P-A operate directly from a 24V rail without external regulation?

Yes - the AH3722A-P-A is rated for continuous operation from 3.0V to 28V, with internal bandgap regulation and Zener clamping protecting internal circuits. It draws only 3–5mA supply current across the full voltage range, making it suitable for direct 24V connection in industrial controls without pre-regulation.

Does AH3722A-P-A require an external pullup resistor?

No - the device integrates a 10–18kΩ pullup resistor on the OUTPUT pin, enabling direct interface to microcontroller GPIOs or logic inputs without external components. This simplifies layout, reduces bill-of-materials cost, and improves reliability in high-vibration environments where solder joints may fatigue.

How does chopper stabilization improve performance in AH3722A-P-A?

Chopper stabilization in AH3722A-P-A cancels offset voltage drift caused by temperature and mechanical stress, resulting in <±10% variation in BOP/BRP over –40°C to +125°C. It also enhances immunity to electromagnetic interference, allowing stable operation near brushless motor drivers and switching power supplies without additional shielding.