Diodes Incorporated AH3280Q-W-7

Overview

AH3280Q-W-7 from Diodes Incorporated is an AEC-Q100 qualified, two-wire automotive Hall-effect latch switch IC in SC59 (Type A1) package, designed for position and proximity sensing in harsh environments. It operates from 2.7V to 27V, features BOP = 8–28 G and BRP = –28 to –8 G at +25°C, includes integrated self-diagnostics, thermal shutdown with auto-restart, and delivers 3.3 mA typical off-state supply current. Used in gear position detection and door/trunk closure systems.

For engineers reviewing the AH3280Q-W-7 datasheet, AH3280Q-W-7 pinout, AH3280Q-W-7 application, or AH3280Q-W-7 equivalent, key selection criteria include latch magnetic behavior (BOP/BRP hysteresis), wide supply range compatibility, AEC-Q100 qualification status, thermal protection threshold (190°C), and SC59 package footprint for space-constrained automotive PCBs.

Technical Context

The AH3280Q-W-7 implements a chopper-stabilized Hall sensor architecture with dynamic offset cancellation, enabling stable switching points across –40°C to +150°C ambient. Its internal bandgap regulator supplies temperature-compensated voltage to analog circuitry, minimizing drift in BOP and BRP over temperature.

This latch-type device responds to south-pole magnetic fields: output turns on when flux exceeds BOP (+8 to +28 G), remains latched until reversed polarity field falls below BRP (–28 to –8 G), and supports up to 50 kHz switching frequency under strong field conditions. Built-in UVLO (2.2–2.7 V), reverse-voltage protection (–32 V), and ESD robustness (HBM 8 kV) ensure reliability in 12 V/24 V automotive electrical systems.

Key Specifications

Pinout & Package

SC59 (Type A1) surface-mount package: 3-pin, single-row, gull-wing lead form with 0.95 mm pitch; body dimensions 2.90 × 2.80 × 1.45 mm (L × W × H); thermal resistance RθJA = 268 °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 AH3280Q-W-7, AL3280Q-W-7 offers lower-cost diagnostics with reduced fault coverage, while TLE4961-2M trades two-wire simplicity for higher magnetic sensitivity and external protection flexibility-making AH3280Q-W-7 optimal for cost-sensitive, space-constrained automotive latch sensing with full built-in protection.

Availability

AH3280Q-W-7 is available at Aetrix Electronics and suitable for seatbelt buckle detection, gear position sensing, door/trunk closure monitoring, and wiper arm feedback requiring stable component supply across automotive production lifecycles.

Supply support for AH3280Q-W-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 manufacturer specializing in discrete, analog, and mixed-signal solutions for automotive, industrial, and consumer markets, with ISO/TS 16949 and IATF 16949 certified manufacturing.

AH3280Q-W-7 belongs to the AH32xxQ automotive Hall-effect switch family, engineered specifically for robust, two-wire position sensing in safety-critical vehicle subsystems operating under extreme thermal and electrical stress.

FAQ

What is the magnetic polarity requirement for AH3280Q-W-7 operation?

The AH3280Q-W-7 is a south-pole active latch: it turns on when a south pole approaches the marked side of the SC59 package (B > +8 G), and remains latched until a north pole reduces flux below –8 G. North-pole-only actuation will not trigger switching, and polarity reversal is mandatory for reset.

Does AH3280Q-W-7 require an external bypass capacitor?

Yes-a minimum 100 nF ceramic decoupling capacitor must be placed between VDD and GND, as close as possible to the IC pins. This stabilizes the internal regulator, suppresses supply noise, and ensures reliable chopper stabilization; omission causes erratic switching and increased jitter.

Can AH3280Q-W-7 be used in high-vibration environments like engine compartments?

Yes-its chopper-stabilized architecture and 7 μs response time provide immunity to mechanical vibration-induced magnetic noise. Combined with AEC-Q100 Grade 0 qualification and 8 kV HBM ESD rating, it maintains stable operation in under-hood locations with shock/vibration profiles up to 30 g.

Is AH3280Q-W-7 pin-compatible with other devices in the AH32xxQ family?

Yes-all AH32xxQ variants (AH3241Q–AH3244Q, AH3280Q–AH3282Q) share identical SC59 (Type A1) and SIP-3 pinouts (VDD–NC–GND). However, magnetic behavior differs: AH3280Q is latch-type, while AH324xQ parts are unipolar; direct substitution requires firmware and magnet configuration review.