Diodes Incorporated AH3727-P-B

Overview

AH3727-P-B from Diodes Incorporated is a high-voltage bipolar Hall-effect latch IC designed for position sensing in harsh automotive and industrial environments. It operates from 3.0V to 28V, features ±140G typical operate/release points (BOP/BRP), delivers <0.4V output saturation at 20mA, and uses chopper-stabilized architecture for stable switching across –40°C to +125°C - deployed in BLDC motor commutation and flow meter angular indexing.

For engineers reviewing the AH3727-P-B datasheet, AH3727-P-B pinout, AH3727-P-B application, or AH3727-P-B equivalent, key selection criteria include magnetic sensitivity hysteresis (280G typ), open-drain output current limit (30–55mA), reverse supply protection (–18V), ESD robustness (8kV HBM), and SIP-3 bulk-pack mechanical compatibility with through-hole PCB assembly.

Technical Context

The AH3727-P-B implements a chopper-stabilized Hall sensor with dynamic offset cancellation, enabling minimal switch-point drift over temperature and supply voltage. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, while the single open-drain output integrates overcurrent limiting and zener clamping for fault resilience.

It functions as a bipolar latch: South pole exposure switches the output low (ON), and North pole exposure releases it (OFF), with hysteresis of 280G (typ) ensuring noise-immune state retention. The device requires no external components for basic operation but recommends a 10nF–100nF bypass capacitor (CIN) on VDD for RF immunity and supply stability.

Key Specifications

Pinout & Package

Package: SIP-3 (Bulk Pack), 3-pin straight-lead through-hole package with 14.5mm body length, 3.0mm width, and 1.5mm height - optimized for automated insertion and high-reliability solder joints in industrial control modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with A1220LLHLT-T and US1881EUA-ABA-000-RE, AH3727-P-B uniquely combines high magnetic immunity (±140G), full supply rail protection (–18V reverse, 32V transient), and SIP-3 bulk-pack manufacturability - making it optimal for high-volume, high-reliability industrial motion control where field serviceability and long-term parametric stability are critical.

Availability

AH3727-P-B is available at Aetrix Electronics and suitable for BLDC motor commutation, flow meter indexing, and industrial linear position sensing requiring stable component supply across automotive Tier-1, HVAC OEM, and factory automation programs.

Supply support for AH3727-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, automotive, computing, and consumer markets - with ISO/TS 16949-certified manufacturing and AEC-Q100-qualified product lines.

AH3727-P-B belongs to the AH372X high-voltage Hall-effect latch family, engineered specifically for contactless position and speed sensing in electrically noisy, thermally demanding environments - emphasizing latch reliability, supply resilience, and magnetic hysteresis control.

FAQ

What is the magnetic polarity behavior of AH3727-P-B?

The AH3727-P-B is a bipolar latch: it turns ON (pulls OUTPUT low) when exposed to a sufficient South pole magnetic field perpendicular to the marked side of the package, and remains latched until a sufficient North pole field causes it to turn OFF. Its BOP is +140G (typ) and BRP is –140G (typ), with 280G hysteresis ensuring stable state retention in vibrating environments.

Can AH3727-P-B operate directly from a 24V truck battery?

Yes - AH3727-P-B supports 3.0V to 28V continuous operation and includes an internal reverse-blocking diode rated for –18V and a zener clamp on VDD. It tolerates load-dump transients up to 32V (absolute max), making it suitable for direct connection to 24V automotive systems without external protection circuitry.

What is the recommended pull-up resistor value for the open-drain output?

A 1kΩ to 10kΩ pull-up resistor to VDD is recommended. With RL = 1kΩ and CL = 20pF, the output rising time is 0.2–1µs and falling time is 0.1–1µs. Lower resistance improves rise time but increases power consumption; higher resistance saves power but slows edge rates - select based on downstream logic thresholds and noise margin requirements.

Does AH3727-P-B require an external bypass capacitor?

Yes - a 10nF to 100nF ceramic capacitor (CIN) between VDD and GND is recommended adjacent to the device. This stabilizes the internal bandgap regulator, suppresses supply noise, and enhances RF immunity per IEC 61000-4-3 testing - omission may cause erratic switching in electrically noisy environments like motor drives.