Diodes Incorporated AH3323Q-P-B

Overview

AH3323Q-P-B from Diodes Incorporated is an AEC-Q100 Grade 0 qualified automotive Hall-effect unipolar switch IC in SIP-3 (Bulk Pack) package, designed for position and proximity sensing in harsh environments. It operates from 3.0V to 28V, features BOP = 38–72 G and BRP = 20–50 G, delivers open-drain output with 60 mA current limit, and supports -40°C to +150°C ambient operation-used in seatbelt buckles, gear position detection, and door/trunk closure systems.

For engineers reviewing the AH3323Q-P-B datasheet, AH3323Q-P-B pinout, AH3323Q-P-B application, or AH3323Q-P-B equivalent, this page provides verified magnetic thresholds, thermal derating curves, chopper-stabilized offset cancellation architecture, load-dump protection, and SIP-3 terminal mapping to support robust automotive sensor integration.

Technical Context

The AH3323Q-P-B implements a chopper-stabilized Hall sensor with dynamic offset cancellation and internal bandgap-regulated supply, ensuring minimal switch-point drift over temperature and stress. Its magnetic response is polarity-specific: for SIP-3 packages, activation requires South pole applied to the part-marking side.

Functional block includes low-pass filtering, sample-and-hold amplification, and integrated power switch driving a single open-drain output. Protection circuitry comprises reverse-blocking diode, zener clamps on VDD and OUTPUT pins, and output overcurrent limiting at 30–55 mA.

Key Specifications

Pinout & Package

SIP-3 (Bulk Pack) package: 3-pin straight-lead, surface-mount package with 2.54 mm pitch, optimized for high-volume automotive assembly and thermal dissipation up to 550 mW at 25°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AL3323Q-P-B, AH3323Q-P-B offers identical electrical and magnetic performance with Diodes Incorporated's documented IATF 16949 manufacturing controls; versus TLE4913-2SA, it provides lower BOP, true unipolar operation, and chopper-based stability-critical for consistent performance across wide temperature gradients in seat and gear applications.

Availability

AH3323Q-P-B is available at Aetrix Electronics and suitable for automotive seatbelt systems, transmission gear position monitoring, and door/trunk closure detection requiring stable component supply across extended temperature and voltage ranges.

Supply support for AH3323Q-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and computing markets.

The AH332XQ series belongs to Diodes' automotive Hall-effect sensor product line, engineered specifically for contactless position sensing in safety-critical and thermally demanding vehicle subsystems.

FAQ

What is the magnetic polarity requirement for AH3323Q-P-B activation?

The AH3323Q-P-B in SIP-3 (Bulk 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. The device will not respond to North pole fields or South pole on the opposite side, ensuring directional reliability in mechanical assemblies like seatbelt latches.

Does AH3323Q-P-B require an external capacitor on VDD?

Yes - a 10 nF to 100 nF ceramic decoupling capacitor (CIN) is required between VDD and GND per the Typical Applications Circuit. This stabilizes the internal bandgap regulator, improves noise immunity against RF interference, and prevents false triggering during load dump transients. Omission risks erratic output behavior under electromagnetic stress.

Can AH3323Q-P-B drive a relay directly?

No - the AH3323Q-P-B has a 60 mA continuous output current limit and open-drain topology, insufficient for most automotive relays (typically requiring 100–300 mA). 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 AH3323Q-P-B pin-compatible with AH3322Q-P-B?

Yes - both share identical SIP-3 (Bulk Pack) package, 3-pin layout, and pin functions (VDD, GND, OUTPUT). However, their magnetic thresholds differ: AH3322Q has BOP = 15–45 G and BRP = 5–35 G, while AH3323Q has BOP = 38–72 G and BRP = 20–50 G. Electrical and thermal specs are otherwise identical, enabling direct substitution only when magnetic actuation strength matches the higher threshold.