Diodes Incorporated AH3241Q-P-A

Overview

AH3241Q-P-A from Diodes Incorporated is an AEC-Q100 qualified, two-wire automotive Hall-effect unipolar switch IC with integrated self-diagnostics, designed for position and proximity sensing in seatbelt buckle detection and door/trunk closure systems. It operates from 2.7V to 27V, features inverted output polarity, BOP = 65–120 G (typ. 90 G) at +25°C, BRP = 45–100 G (typ. 70 G), and delivers IOFF = 5–6.9 mA and ION = 12–17 mA.

For engineers reviewing the AH3241Q-P-A datasheet, AH3241Q-P-A pinout, AH3241Q-P-A application, or AH3241Q-P-A equivalent, this device supports high-reliability automotive sensing where magnetic threshold stability, reverse polarity protection, thermal shutdown, and ISO 26262 readiness are critical selection criteria.

Technical Context

The AH3241Q-P-A implements a chopper-stabilized architecture with dynamic offset cancellation and an internal bandgap regulator to deliver temperature-compensated operation across –40°C to +150°C ambient. Its unipolar switching behavior responds exclusively to south-pole magnetic fields exceeding BOP, holding the output state until flux falls below BRP.

It integrates battery reverse polarity protection via an internal blocking diode with zener clamp, UVLO (2.2–2.7 V), overtemperature shutdown (190°C trip, 180°C release), and ESD robustness (HBM 8 kV, CDM 1 kV), all within a SIP-3 package rated for 143 °C/W thermal resistance.

Key Specifications

Pinout & Package

Package: SIP-3 (Ammo Pack), 3-pin single-inline package with straight leads, 14.5 mm body length, 3.0 mm width, and 1.5 mm height; 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 unipolar Hall switch applications.

Compared with AL3241Q-P-A and TLE4913-2SA, the AH3241Q-P-A uniquely combines two-wire simplicity, AEC-Q100 Grade 0 qualification, embedded diagnostics, and reverse-polarity resilience-making it optimal for new automotive designs requiring functional safety and harness simplification.

Availability

AH3241Q-P-A is available at Aetrix Electronics and suitable for seatbelt buckle detection, door/trunk closure monitoring, and wiper position feedback requiring stable component supply across automotive production lifecycles.

Supply support for AH3241Q-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability automotive, industrial, and power management solutions.

The AH3241Q-P-A belongs to Diodes' AEC-Q100 qualified Hall-effect switch product line, engineered specifically for contactless position sensing in harsh automotive environments with emphasis on diagnostic capability and system-level safety compliance.

FAQ

What is the magnetic polarity sensitivity of the AH3241Q-P-A?

The AH3241Q-P-A is a south-pole-activated unipolar switch: it turns ON only when a south-pole magnetic field exceeds its BOP threshold (65–120 G), and remains ON until flux drops below BRP (45–100 G). It does not respond to north-pole fields, ensuring immunity to stray magnetic interference in vehicle cabins.

Can the NC pin be used for PCB layout optimization?

Pin 2 (NC) is internally unconnected and has no electrical function. It may be tied to VDD, GND, or left floating without affecting performance. In SIP-3 layouts, it can serve as a mechanical anchor point or routing relief-no current flows through it, and no thermal or noise coupling occurs.

How does the two-wire configuration simplify system design?

The AH3241Q-P-A uses a two-wire current-loop interface: VDD and GND double as power and signal lines. Output state is encoded as high/low supply current (ION ≈14.5 mA / IOFF ≈6 mA), eliminating the need for a separate signal wire, pull-up resistors, or level-shifting circuitry-reducing connector pins, harness weight, and EMI susceptibility.

Is the AH3241Q-P-A compliant with functional safety standards?

Yes-the AH3241Q-P-A is ISO 26262-ready and supports ASIL-B system integration. Its integrated self-diagnostics generate a defined safe-mode current (0.5–1.5 mA) during faults, and its AEC-Q100 Grade 0 qualification, UVLO, thermal shutdown, and ESD robustness collectively fulfill hardware-level safety requirements for automotive sensing functions.