Diodes Incorporated AH3328Q-P-A

Overview

AH3328Q-P-A from Diodes Incorporated is an AEC-Q100 Grade 0 qualified automotive Hall-effect unipolar switch IC designed for high-reliability position sensing in seatbelt buckles and transmission gear position detection. It operates from 3.0V to 28V, features open-drain output with 60mA current limit, 130–180G operate point (BOP), and -40°C to +150°C operating temperature range.

For engineers reviewing the AH3328Q-P-A datasheet, AH3328Q-P-A pinout, AH3328Q-P-A application, or AH3328Q-P-A equivalent, this device supports robust magnetic sensing in harsh automotive environments where supply voltage variation, thermal drift, and ESD immunity are critical selection criteria.

Technical Context

The AH3328Q-P-A uses chopper-stabilized architecture with dynamic offset cancellation to suppress thermal drift and mechanical stress effects on switching thresholds. Its internal bandgap regulator provides temperature-compensated biasing across the full -40°C to +150°C range.

It implements unipolar South-pole activation with hysteresis (16–33G) and integrates reverse-blocking diode, supply zener clamp (28V), and output zener clamp-enabling direct connection to 12V/24V automotive rails without external protection components.

Key Specifications

Pinout & Package

Package: SIP-3 (Ammo Pack), 3-pin surface-mount package with spread leads; optimized for automated placement and high-vibration automotive mounting.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AL3328Q-P-A, AH3328Q-P-A delivers certified Grade 0 reliability and superior ESD robustness for safety-critical zones; versus TLE4913-2SA, it reduces BOM count via integrated protection but requires external pull-up for 24V logic interfacing.

Availability

AH3328Q-P-A is available at Aetrix Electronics and suitable for seatbelt buckle detection, transmission gear position sensing, and steering column lock verification requiring stable component supply across extended automotive production lifecycles.

Supply support for AH3328Q-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 manufacturer specializing in discrete, analog, and mixed-signal solutions for automotive, industrial, and consumer markets.

The AH332XQ series belongs to Diodes' automotive-grade Hall-effect sensor product line, engineered specifically for contactless position and proximity sensing in high-temperature, high-noise vehicle subsystems.

FAQ

What magnetic polarity activates the AH3328Q-P-A?

The AH3328Q-P-A is a unipolar South-pole-activated device. For SIP-3 (Ammo Pack) packages like the -P-A variant, the South pole must be presented to the part marking side to trigger output turn-on. This polarity alignment is fixed per package type and cannot be reversed via configuration.

Can AH3328Q-P-A operate directly from a 24V truck battery system?

Yes. The device supports 3.0V to 28V continuous operation and withstands 40V load dump transients per AEC-Q100 stress testing. Its integrated reverse-blocking diode and supply-side zener clamp eliminate need for external protection components in 24V commercial vehicle applications.

Is the output compatible with 5V microcontrollers?

Yes. The open-drain output can be pulled up to any voltage ≤28V. When using a 5V pull-up resistor, the output low voltage remains ≤0.4V at 20mA sink current, ensuring clean TTL/CMOS logic-level compatibility without level-shifting circuitry.

How does the chopper stabilization improve performance over conventional Hall switches?

Chopper stabilization dynamically cancels offset voltage drift caused by temperature gradients and mechanical stress. In the AH3328Q-P-A, this reduces BOP/BRP variation to ±5G over -40°C to +150°C - enabling consistent switching thresholds in engine bay or transmission housing where thermal cycling would otherwise cause false triggers.