Diodes Incorporated AH3280Q-P-B

Overview

AH3280Q-P-B from Diodes Incorporated is an AEC-Q100 qualified, two-wire automotive Hall-effect latch switch IC in SIP-3 package, designed for position and proximity sensing in harsh environments. It operates from 2.7V to 27V, features BOP = 8–28 G (typ. 18 G) and BRP = –28 to –8 G (typ. –18 G), includes chopper stabilization, thermal shutdown at 190°C, and delivers 3.3 mA off-state supply current. Used in seatbelt buckle detection and gear position sensing.

For engineers reviewing the AH3280Q-P-B datasheet, AH3280Q-P-B pinout, AH3280Q-P-B application, or AH3280Q-P-B equivalent, this page provides verified magnetic thresholds, latch behavior confirmation, SIP-3 terminal mapping, self-diagnostic capability details, and automotive-grade reliability data - all extracted from Diodes DS41822 Rev. 6-3.

Technical Context

The AH3280Q-P-B implements a latch switching function: output turns on when south-pole magnetic flux exceeds BOP (≥18 G typ.) and remains latched until reversed polarity field drops below BRP (≤–18 G typ.). Its chopper-stabilized architecture eliminates offset drift and ensures ±3.3 µs output jitter over –40°C to +150°C ambient.

Internal bandgap regulation supplies temperature-compensated bias to analog blocks, while integrated reverse-blocking diode and zener clamp protect against –32 V reverse supply transients. Thermal protection triggers at 190°C junction temperature and auto-restarts at 180°C.

Key Specifications

Pinout & Package

Package: SIP-3 (Bulk Pack), 3-pin single-inline package with straight leads, 14.5 mm body length, 3.0 mm width, and 1.5 mm height - optimized for through-hole mounting in automotive control units.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AH3280Q-P-B, A1220LLHLT-T adds package flexibility but increases BOM count and layout complexity, while US1881EUA-ABA-000-SP matches form factor but omits critical automotive protections - making AH3280Q-P-B the only option with integrated diagnostics, thermal autonomy, and direct battery survivability in SIP-3.

Availability

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

Supply support for AH3280Q-P-B 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 IATF 16949 certified facilities and AEC-Q100 product validation expertise.

AH3280Q-P-B belongs to the AH32xxQ automotive Hall switch family, engineered specifically for contactless position sensing in high-temperature, high-voltage vehicle subsystems - emphasizing latch stability, self-test capability, and functional safety readiness.

FAQ

What is the magnetic polarity sensitivity of AH3280Q-P-B?

AH3280Q-P-B is south-pole active: output turns ON when south-pole magnetic flux exceeds BOP (8–28 G), and remains latched until north-pole flux falls below BRP (–28 to –8 G). It does not respond to north-pole-only actuation or alternating fields without polarity reversal.

Does AH3280Q-P-B require an external bypass capacitor?

Yes - a ≥100 nF ceramic decoupling capacitor between VDD and GND is mandatory per Diodes DS41822. It stabilizes the internal bandgap regulator, suppresses supply noise, and ensures reliable chopper operation; placement must be within 2 mm of the pins.

How does the self-diagnostic function operate during fault conditions?

Under fault (e.g., UVLO, overtemperature, or magnetic sampling failure), AH3280Q-P-B enters safe mode and draws 0.5–1.5 mA (ISAFE) instead of normal IOFF/ION - enabling ECU-level fault detection via current monitoring without additional sensors.

Is AH3280Q-P-B pin-compatible with other AH32xxQ variants in SIP-3 package?

Yes - all AH32xxQ SIP-3 variants (e.g., AH3241Q-P-B, AH3281Q-P-B) share identical pinout (VDD–NC–GND), footprint, and mounting dimensions. However, magnetic thresholds, output polarity, and off-state current differ - direct substitution requires firmware and magnet design review.