Diodes Incorporated AH3724A-P-B

Overview

AH3724A-P-B from Diodes Incorporated is a high-voltage, high-sensitivity bipolar Hall-effect latch IC with internal 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 20–60G / –60G to –20G, −40°C to +125°C operation, and chopper-stabilized architecture for thermal stability.

For engineers reviewing the AH3724A-P-B datasheet, AH3724A-P-B pinout, AH3724A-P-B application, or AH3724A-P-B equivalent, this page delivers verified magnetic thresholds, internal pullup resistance (10–18 kΩ), output current limit (30–55 mA), startup time (10 µs), and package-specific terminal mapping for SIP-3 (Bulk Pack) implementation.

Technical Context

The AH3724A-P-B 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 latching behavior-South pole activation (BOP ≥ 20 G), North pole deactivation (BRP ≤ −20 G)-enables robust position detection without external biasing.

It integrates reverse-blocking diode and Zener clamp on VDD, output overcurrent limiting (IOCL = 30–55 mA), and internal pullup (RPU = 10–18 kΩ), eliminating external components in open-drain configurations. The 500 kHz chopping frequency suppresses low-frequency drift and enhances immunity to mechanical stress and RF noise.

Key Specifications

Pinout & Package

SIP-3 (Bulk Pack) package: 3-pin single-inline package with straight leads, 14.5 mm body length, 3.0 mm width, and 1.5 mm height; RoHS-compliant matte tin plating; moisture sensitivity level not specified per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AH3724A-P-B, AL3724QSA-7 adds automotive qualification at higher cost and longer lead time, while US1881LUA-AAA-000 sacrifices integration (no internal pullup) and thermal stability (no chopper stabilization) for lower unit price in non-industrial settings.

Availability

AH3724A-P-B is available at Aetrix Electronics and suitable for brushless DC motor commutation, flow metering, and linear encoder position sensing requiring stable component supply across industrial temperature ranges and high-voltage operating conditions.

Supply support for AH3724A-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 automotive markets.

AH3724A-P-B belongs to the AH37xx high-voltage Hall-effect latch family, engineered for robust magnetic sensing in harsh environments where wide supply range, thermal stability, and integrated protection are critical.

FAQ

What is the magnetic hysteresis (BHY) of AH3724A-P-B?

The AH3724A-P-B has a guaranteed hysteresis range of 40–120 G, calculated as |BOP| − |BRP|. Typical hysteresis is 80 G at +25°C and 12 V supply. This wide hysteresis prevents chatter during slow or noisy magnetic transitions, especially in vibration-prone motor and flow meter applications.

Can AH3724A-P-B operate directly from a 24 V industrial rail?

Yes - AH3724A-P-B is rated for continuous operation from 3.0 V to 28 V and withstands 32 V transients on VDD. Its integrated Zener clamp (28 V) and reverse-blocking diode protect against load dump and back-EMF, making it suitable for direct connection to unregulated 24 V systems without external regulators or TVS diodes.

Does AH3724A-P-B require an external pullup resistor?

No - AH3724A-P-B includes an internal pullup resistor (10–18 kΩ) on the OUTPUT pin. This eliminates the need for an external resistor in standard open-drain configurations, reducing BOM count and PCB area. External pullups are unnecessary unless specific rise-time tuning or voltage-level shifting is required.

How does the chopper stabilization improve performance over non-chopped Hall latches?

Chopper stabilization in AH3724A-P-B modulates the Hall element signal at 500 kHz, canceling offset voltage drift caused by temperature gradients and mechanical stress. This results in < ±0.5 G/°C BOP drift versus > ±2 G/°C in non-chopped devices, ensuring consistent switching points across −40°C to +125°C without calibration.