Diodes Incorporated AH3724Q-P-B

Overview

AH3724Q-P-B from Diodes Incorporated is an AEC-Q100 Grade 0 qualified, high-voltage bipolar Hall-effect latch IC designed for automotive brushless DC motor commutation and angular position sensing. It operates from 3.0V to 28V, features BOP = 40 G (typ), BRP = −40 G (typ), and delivers open-drain output switching with 30–55 mA current limiting - deployed in engine camshaft/crankshaft position detection and EPS motor control.

For engineers reviewing the AH3724Q-P-B datasheet, AH3724Q-P-B pinout, AH3724Q-P-B application, or AH3724Q-P-B equivalent, this page provides verified magnetic thresholds, chopper-stabilized temperature stability data, SC59/SOT23 package polarity mapping, and automotive-grade ESD/overvoltage protection details critical for functional safety validation and layout design.

Technical Context

The AH3724Q-P-B uses a chopper-stabilized architecture with dynamic offset cancellation to suppress thermal drift and mechanical stress-induced errors, enabling stable switching points across −40°C to +150°C. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, ensuring consistent BOP/BRP hysteresis of 80 G (typ) over full voltage and temperature range.

Magnetic polarity response is package-dependent: SOT23 (Type S) and SIP-3 require South pole on the part-marking side for turn-on, while SC59 requires South pole on the non-marking side. The single open-drain output integrates overcurrent limiting (IOCL = 30–55 mA) and zener clamping (VZ = 28 V), with reverse supply protection via integrated blocking diode.

Key Specifications

Pinout & Package

Package: SC59 (JEDEC TO-92 variant), also available in SOT23 (Type S) and SIP-3 formats. Pinout is identical across packages: 3-pin single-ended configuration with VDD, GND, and open-drain OUTPUT.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AL3724Q and TLE4964-2M, the AH3724Q-P-B uniquely combines AEC-Q100 Grade 0 qualification, 3–28 V operation, 8 kV ESD, and integrated reverse-voltage protection - making it the only choice for production-critical, battery-connected automotive position sensing where reliability and compliance are non-negotiable.

Availability

AH3724Q-P-B is available at Aetrix Electronics and suitable for engine management systems, electric power steering modules, and transmission control units requiring stable component supply under extended temperature and voltage stress.

Supply support for AH3724Q-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 manufacturer specializing in discrete, analog, and mixed-signal solutions for automotive, industrial, and computing markets.

The AH372XQ series belongs to Diodes' AEC-Q100-qualified Hall-effect sensor product line, engineered specifically for high-reliability automotive position and speed sensing in harsh under-hood environments.

FAQ

What is the magnetic polarity requirement for AH3724Q-P-B turn-on in SC59 package?

In SC59 package, the AH3724Q-P-B requires the South pole to be presented to the non-part-marking side of the package to activate the output. This is opposite to SOT23 (Type S) and SIP-3 variants, where the South pole must face the marking side. Polarity misalignment causes failure to switch - orientation must be verified per package type before PCB layout.

Does AH3724Q-P-B require an external bypass capacitor?

Yes - a 10 nF to 100 nF ceramic capacitor (CIN) between VDD and GND is mandatory for power stabilization and RF noise immunity, as specified in the Typical Applications Circuit. Omitting CIN increases susceptibility to conducted EMI from adjacent solenoids or switching regulators, potentially causing erratic latching behavior.

Can AH3724Q-P-B drive an LED directly?

No - the open-drain output is rated for 55 mA continuous sink current, but driving an LED requires current-limiting resistance and proper voltage headroom. With 28 V supply, direct LED connection risks exceeding forward voltage or thermal limits; use a series resistor (e.g., 1 kΩ for ~25 mA at 12 V) and verify power dissipation in the IC's 230 mW SC59 package derating curve.

Is AH3724Q-P-B compatible with 3.3 V microcontroller GPIO inputs?

Yes - when pulled up to 3.3 V, the AH3724Q-P-B's output low voltage (VOUT_ON ≤ 0.4 V at 20 mA) guarantees valid logic LOW to 3.3 V CMOS inputs. However, ensure the pull-up resistor value (typically 4.7 kΩ–10 kΩ) balances rise time against MCU input leakage and bus capacitance to meet timing requirements in high-RPM sensing.