Diodes Incorporated AH3282Q-P-A

Overview

AH3282Q-P-A from Diodes Incorporated is a two-wire automotive Hall-effect latch switch IC with integrated self-diagnostics, AEC-Q100 qualified for -40°C to +150°C operation, 15–45 G operating point (BOP), -45 to -15 G release point (BRP), and 3.3 mA off-state supply current - used in gear position sensing, door/trunk closure detection, and seatbelt buckle monitoring.

For engineers reviewing the AH3282Q-P-A datasheet, AH3282Q-P-A pinout, AH3282Q-P-A application, or AH3282Q-P-A equivalent, key selection criteria include latch-mode magnetic hysteresis, two-wire current-loop interface compatibility, thermal shutdown behavior at 190°C junction, and SIP-3 package suitability for high-vibration automotive mounting.

Technical Context

The AH3282Q-P-A implements a chopper-stabilized Hall sensor with dynamic offset cancellation and internal bandgap-regulated supply, enabling stable switching across ±1100 ppm/°C temperature drift (typical for direct-polarity variants). Its latch functionality requires magnetic polarity reversal to toggle output state - south pole above BOP turns output on; north pole below BRP turns it off.

Integrated diagnostics include undervoltage lockout (2.2–2.7 V threshold), safe-mode error current (0.5–1.5 mA), and overtemperature shutdown with auto-restart at 180°C release. The device supports high-side and low-side sensing configurations using external load resistors and 100 nF decoupling capacitance.

Key Specifications

Pinout & Package

Package: SIP-3 (Ammo Pack), 3-pin single-inline package with straight leads, optimized for automated insertion and high-reliability automotive harness connections. Thermal resistance RθJA = 143°C/W on 50 mm × 50 mm 2 oz PCB.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AH3282Q-P-A, AL3282Q-P-A offers enhanced ESD resilience without altering magnetic performance or package, while DRV5013AQDBZR trades automotive qualification and built-in protection for broader magnetic sensitivity and lower unit cost in non-automotive contexts.

Availability

AH3282Q-P-A is available at Aetrix Electronics and suitable for gear position sensing, door/trunk closure monitoring, and seatbelt buckle detection requiring stable component supply across automotive production lifecycles.

Supply support for AH3282Q-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 devices for automotive, industrial, and consumer markets.

The AH32xxQ series belongs to Diodes' automotive Hall-effect switch product line, designed specifically for robust, AEC-Q100-compliant position and proximity sensing in harsh under-hood and chassis-mounted applications.

FAQ

What is the magnetic polarity requirement for AH3282Q-P-A activation?

AH3282Q-P-A activates when a south-pole magnetic field exceeding +15 G (min) is applied to the marked surface. It remains latched until a north-pole field stronger than -15 G (min) is applied - polarity reversal is mandatory to reset the output state. This behavior is confirmed in the magnetic characteristics table for TA = +25°C and validated across -40°C to +150°C.

Does AH3282Q-P-A require an external pull-up resistor?

No - AH3282Q-P-A operates as a two-wire current-sourcing device and does not use a pull-up resistor. It regulates its own output current in the on-state (12–17 mA) and off-state (2–5 mA), forming a current loop with the ECU's sense resistor. External RL is typically 100 Ω for voltage drop interpretation, per the typical application circuits in DS41822 Rev. 6-3.

How does the integrated self-diagnostic function work in practice?

Under fault conditions - including UVLO, overtemperature, or internal logic error - AH3282Q-P-A enters safe mode and sources a defined 0.5–1.5 mA current (ISAFE) instead of normal IOFF or ION levels. This distinct current level allows the ECU to distinguish fault states from nominal operation without additional sensors or circuitry, supporting ISO 26262 diagnostic coverage requirements.

Can AH3282Q-P-A be used in high-vibration environments like transmission housings?

Yes - AH3282Q-P-A is qualified to AEC-Q100 Grade 0 (-40°C to +150°C) and packaged in SIP-3 with 143°C/W thermal resistance on standard PCBs. Its chopper-stabilized design minimizes mechanical stress-induced offset drift, and the latch function inherently rejects vibration-induced transient fields due to required polarity reversal for state change - verified in automotive mechanical shock and random vibration test reports.