Diodes Incorporated AH3328Q-SA-7

Overview

AH3328Q-SA-7 from Diodes Incorporated is an AEC-Q100 Grade 0 qualified automotive Hall-effect unipolar switch IC in SOT23 (Type S) package, designed for proximity sensing in high-reliability seatbelt buckle and gear position detection systems. It operates from 3.0V to 28V, features 150G typical operate point (BOP), 125G typical release point (BRP), 25G hysteresis, and delivers open-drain output with 60mA current limit and 0.4V max on-state voltage at 20mA.

For engineers reviewing the AH3328Q-SA-7 datasheet, AH3328Q-SA-7 pinout, AH3328Q-SA-7 application, or AH3328Q-SA-7 equivalent, this device supports robust magnetic switching in harsh automotive ambient conditions (−40°C to +150°C), integrates reverse-blocking diode and zener clamps on VDD/output, and requires south-pole actuation toward the part marking side per its SOT23 (Type S) orientation.

Technical Context

The AH3328Q-SA-7 uses chopper-stabilized architecture with dynamic offset cancellation to suppress thermal drift and mechanical stress effects, enabling stable BOP/BRP performance across −40°C to +150°C. Its internal bandgap regulator supplies temperature-compensated bias to analog circuitry, ensuring consistent switching thresholds independent of supply variation.

It implements a single-stage comparator with hysteresis (25G typical), sampled via 500kHz chopping frequency, and drives an open-drain NMOS output stage with overcurrent limiting (30–55mA) and integrated zener clamp (28V). Magnetic actuation polarity is fixed: south pole must be applied to the marked side of the SOT23 (Type S) package to activate the output.

Key Specifications

Pinout & Package

SOT23 (Type S) package: 3-pin surface-mount, 2.9mm × 2.4mm footprint, 1.0mm height, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with A1120EUA-T and US1881EUA-ABA-001-SP, AH3328Q-SA-7 uniquely combines high magnetic sensitivity (150G BOP), full 28V operation, Grade 0 temperature rating, and integrated protection-making it the only option qualified for demanding under-hood gear position and seatbelt sensing without external components.

Availability

AH3328Q-SA-7 is available at Aetrix Electronics and suitable for seatbelt buckle detection, gear position sensing, and steering column lock applications requiring stable component supply across automotive production lifecycles.

Supply support for AH3328Q-SA-7 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 devices for automotive, industrial, and consumer markets, with design centers across Asia, Europe, and the US.

The AH332XQ series is part of Diodes' automotive Hall-effect sensor product line, engineered specifically for contactless position and proximity sensing in AEC-Q100-compliant vehicle subsystems operating up to 150°C ambient.

FAQ

What is the required magnet strength for reliable operation of AH3328Q-SA-7?

The AH3328Q-SA-7 has a typical operate point (BOP) of 150 Gauss and release point (BRP) of 125 Gauss, with 25 Gauss hysteresis. A neodymium magnet ≥5mm diameter × 1mm thick placed within 2.5mm of the marked side of the SOT23 package reliably exceeds BOP. Ferrite magnets require larger size or closer spacing due to lower field strength.

Does AH3328Q-SA-7 require an external pull-up resistor on the OUTPUT pin?

Yes - the OUTPUT pin is open-drain and requires an external pull-up resistor to VDD or another logic rail. Recommended value is 1kΩ to 10kΩ depending on rise time and bus capacitance; 4.7kΩ is typical for 12V systems with ≤20pF load. No internal pull-up is provided.

Can AH3328Q-SA-7 be used in bidirectional (bipolar) sensing applications?

No - AH3328Q-SA-7 is a unipolar switch optimized for south-pole-only actuation toward the marked side of the SOT23 package. It does not respond to north poles or alternating fields. For bipolar operation, Diodes' AH337xQ series or Melexis US5881 would be appropriate alternatives.

Is the SOT23 (Type S) package of AH3328Q-SA-7 compatible with standard SOT23 pick-and-place equipment?

Yes - the AH3328Q-SA-7 uses industry-standard SOT23 (Type S) dimensions (2.9mm × 2.4mm × 1.0mm) with 0.915mm pitch and defined pin 1 location. It is compatible with standard vision-guided placement systems and reflow profiles for lead-free soldering (J-STD-020, peak 260°C).