Diodes Incorporated AH3326Q-P-A

Overview

AH3326Q-P-A from Diodes Incorporated is an AEC-Q100 Grade 0 qualified automotive Hall-effect unipolar switch IC designed for position and proximity sensing in harsh environments. It operates from 3.0V to 28V, features open-drain output with 60mA current limit, BOP of 65–135G (typ. 100G), BRP of 50–120G (typ. 85G), and functions across –40°C to +150°C. It is deployed in seatbelt buckle detection and transmission gear position sensing.

For engineers reviewing the AH3326Q-P-A datasheet, AH3326Q-P-A pinout, AH3326Q-P-A application, or AH3326Q-P-A equivalent, this device supports high-voltage automotive sensing where magnetic hysteresis, load dump immunity (40V), and chopper-stabilized temperature stability are critical selection criteria.

Technical Context

The AH3326Q-P-A uses a chopper-stabilized architecture with dynamic offset cancellation to suppress thermal drift and mechanical stress effects on switching thresholds. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, enabling stable BOP/BRP performance over –40°C to +150°C.

It implements unipolar South-pole actuation logic with hysteresis (8–25G) and integrates reverse-blocking diode, supply/output zener clamps, and output overcurrent limiting. The single open-drain output requires external pull-up and switches low when B exceeds BOP, remaining latched until B falls below BRP.

Key Specifications

Pinout & Package

Package: SIP-3 (Ammo Pack), 3-pin surface-mount package with spread leads, RoHS-compliant, halogen-free, lead-free construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with A1120EUA-T and US1881EUA-ABA-000-SP, the AH3326Q-P-A uniquely combines 40V load dump tolerance, AEC-Q100 Grade 0 qualification, and 150°C ambient operation-making it the only option qualified for safety-critical, high-temperature automotive position sensing.

Availability

AH3326Q-P-A is available at Aetrix Electronics and suitable for seatbelt buckle detection, transmission gear position sensing, and steering column lock/immobilizer systems requiring stable component supply across extended automotive production lifecycles.

Supply support for AH3326Q-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 company specializing in discrete, analog, and mixed-signal solutions for automotive, industrial, and consumer markets.

The AH332XQ series belongs to Diodes' automotive Hall-effect sensor product line, engineered specifically for robust, high-temperature position and proximity sensing in AEC-Q100-compliant systems.

FAQ

What is the magnetic polarity requirement for AH3326Q-P-A activation?

The AH3326Q-P-A in SIP-3 (Ammo Pack) package requires a South pole applied to the part-marking side to activate. This is confirmed in the datasheet's magnetic characteristics table and pin diagram. Polarity orientation differs for SC59 packages, but AH3326Q-P-A uses SIP-3, so South-to-marking-side is mandatory for reliable BOP triggering.

Does AH3326Q-P-A require an external capacitor on VDD?

Yes - a 10nF to 100nF ceramic decoupling capacitor (CIN) is required between VDD and GND per the Typical Applications Circuit. This stabilizes the internal regulator, improves noise immunity, and ensures clean startup within the 10µs power-on time specification. Omission risks erratic switching or failure to initialize.

Can AH3326Q-P-A drive a relay directly?

No - its 60mA continuous output current limit and open-drain topology are insufficient for most relay coils, which typically require 100–200mA. It must interface through an external NPN transistor or MOSFET driver stage. The datasheet specifies RL as a pull-up resistor, not a load-driving element.

Is AH3326Q-P-A pin-compatible with other AH332XQ variants?

Yes - all AH332XQ variants (AH3322Q through AH3329Q, AH3320Q, AH3321Q) share identical SIP-3, SOT23, and SC59 footprints and pinouts. Only magnetic thresholds differ; electrical interface, protection features, and timing parameters remain consistent across the family.