Diodes Incorporated AH3271Q-P-B

Overview

AH3271Q-P-B from Diodes Incorporated is an AEC-Q100 qualified two-wire automotive Hall-effect latch switch IC in SIP-3 package, designed for magnetic position 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, delivers 6 mA off-state current (IOFF), and supports −40°C to +150°C ambient operation in seatbelt buckle, gear position, door closure, and wiper actuation systems.

For engineers reviewing the AH3271Q-P-B datasheet, AH3271Q-P-B pinout, AH3271Q-P-B application, or AH3271Q-P-B equivalent, key selection criteria include latch polarity (south-pole active direct output), thermal shutdown threshold (+190°C), chopper-stabilized offset cancellation, reverse supply protection (−32 V), and AEC-Q100 Grade 0 qualification for under-hood use.

Technical Context

The AH3271Q-P-B implements a chopper-stabilized Hall sensor with dynamic offset cancellation and internal bandgap-regulated supply, enabling stable switching across temperature without external compensation. Its latch behavior requires magnetic polarity reversal-south pole activation sets output high; north pole (or field removal below BRP) resets it low.

It integrates UVLO (2.2–2.7 V), overtemperature shutdown with auto-restart (TTP = +190°C, TTPR = +180°C), reverse-blocking diode, and zener clamp on VDD. The NC pin (Pin 2) is unconnected but may be tied to VDD, GND, or left floating per layout requirements.

Key Specifications

Pinout & Package

SIP-3 (Bulk Pack) package: 3-pin single-inline package with gull-wing leads, 14.5 mm body length, 3.0 mm width, and 1.5 mm height; optimized for automated through-hole or surface-mount assembly with straight-lead configuration (per ordering code "B").

Key Features

Applications

Equivalent & Alternatives

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

Compared with AL3271Q-P-B, AH3271Q-P-B delivers certified automotive reliability and lower off-current; versus TLE4961-2M, it trades diagnostic capability for wiring simplicity, smaller SIP-3 footprint, and built-in protection-ideal for space-constrained, cost-sensitive closure sensors.

Availability

AH3271Q-P-B 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 AH3271Q-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 ISO/TS 16949 and IATF 16949 certified manufacturing.

AH3271Q-P-B belongs to the AH32xxQ automotive Hall-effect switch family, engineered specifically for robust, two-wire magnetic sensing in safety-critical vehicle subsystems where reliability, temperature resilience, and qualification compliance are mandatory.

FAQ

What is the magnetic polarity requirement for AH3271Q-P-B activation?

AH3271Q-P-B is a south-pole active latch: output turns high when south pole flux exceeds BOP (8–28 G), and remains high until magnetic field reverses and falls below BRP (−28 to −8 G). North pole exposure alone does not trigger switching-it requires field collapse or polarity reversal to reset.

Can Pin 2 (NC) be used as a thermal pad or voltage reference?

No-Pin 2 is internally unconnected with no bond wire or die attachment. It serves no electrical function and must not be used for thermal dissipation, grounding, or voltage referencing. Layout guidelines permit tying it to VDD, GND, or leaving it floating without performance impact.

How does the two-wire configuration affect load resistor selection?

In two-wire mode, AH3271Q-P-B sinks current between VDD and GND. A typical 100 Ω load resistor (RL) is recommended to set output voltage swing; values >100 Ω reduce power dissipation but increase susceptibility to VDD noise-additional series resistance is advised if supply ripple exceeds 100 mVpp.

Is AH3271Q-P-B compliant with RoHS and halogen-free standards?

Yes-AH3271Q-P-B is fully RoHS 3 (2015/863/EU) compliant, lead-free, and halogen/antimony-free ("Green" device), containing <900 ppm bromine, <900 ppm chlorine (<1500 ppm total Br+Cl), and <1000 ppm antimony compounds per Diodes Incorporated's product definitions.