Diodes Incorporated AH3326Q-W-7

Overview

AH3326Q-W-7 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 - deployed in seatbelt buckles and transmission gear position detection.

For engineers reviewing the AH3326Q-W-7 datasheet, AH3326Q-W-7 pinout, AH3326Q-W-7 application, or AH3326Q-W-7 equivalent, key selection criteria include magnetic sensitivity tolerance, SC59 package thermal derating at 150°C, reverse supply protection (–18V), zener clamping on VDD/output, and south-pole activation polarity relative to part marking side.

Technical Context

The AH3326Q-W-7 uses chopper-stabilized architecture with dynamic offset cancellation to minimize temperature-induced switch point drift and ensure stable operation over –40°C to +155°C junction range. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, enabling consistent BOP/BRP hysteresis (8–25G) across full voltage (3–28V) and temperature ranges.

It implements a single-stage comparator with sample-and-hold and low-pass filtering, driving an open-drain NMOS output stage with integrated overcurrent limiting (30–55mA) and zener clamps on both VDD and OUTPUT pins. Magnetic actuation requires South pole orientation toward the non-marking side for SC59 package, differing from SOT23/SIP-3 variants.

Key Specifications

Pinout & Package

Package: SC59 - 3-pin surface-mount package with gull-wing leads, 1.27mm pitch, 2.9mm × 2.4mm body, optimized for automated placement and reflow in automotive PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AL3326Q-W-7 and TLE4913-2XUMA1, AH3326Q-W-7 uniquely combines 40V load dump tolerance, –18V reverse supply capability, and SC59 packaging qualified to AEC-Q100 Grade 0 - making it optimal for cost-sensitive, high-reliability automotive closures and actuators where external protection must be minimized.

Availability

AH3326Q-W-7 is available at Aetrix Electronics and suitable for seatbelt buckle detection, transmission gear position sensing, and steering column lock actuation requiring stable component supply across automotive production lifecycles.

Supply support for AH3326Q-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability solutions for automotive, industrial, and power management markets.

The AH332XQ series belongs to Diodes' AEC-Q100-qualified Hall-effect sensor product line, engineered specifically for contactless position and proximity sensing in demanding automotive subsystems including body electronics and powertrain controls.

FAQ

What is the magnetic polarity requirement for AH3326Q-W-7 activation?

The AH3326Q-W-7 in SC59 package requires a South pole applied to the non-part-marking side to activate. This differs from SOT23 and SIP-3 variants, which require South pole on the marking side. Polarity mismatch causes failure to switch - verify orientation using the top-view pin 1 indicator and package marking diagram in DS46150 Rev. 2-2.

Can AH3326Q-W-7 operate directly from a 24V truck battery without external regulation?

Yes - AH3326Q-W-7 supports 3.0V to 28V supply range and includes 40V transient-rated input protection. It withstands ISO 7637-2 Pulse 5a (load dump) up to 40V for ≤100ms without external TVS. For sustained 24V operation, ensure PCB layout minimizes trace inductance and use ≥10nF local decoupling at VDD.

How does the chopper stabilization architecture improve performance over conventional Hall switches?

Chopper stabilization in AH3326Q-W-7 dynamically cancels offset voltage in the Hall element and amplifier chain, reducing BOP/BRP drift to <±0.5G/°C. This enables stable switching thresholds across –40°C to +150°C without calibration, unlike non-chopped devices that exhibit >2G/°C drift - critical for gear position accuracy in hot transmission environments.

Is AH3326Q-W-7 compatible with standard SC59 pick-and-place equipment?

Yes - AH3326Q-W-7 uses industry-standard SC59 package with 1.27mm lead pitch, 2.9mm × 2.4mm body, and gull-wing leads conforming to JEDEC MO-203-AB. It is supplied in 7" tape-and-reel (3,000 units/reel) with EIA-481-D compliance, supporting automated assembly at speeds up to 25,000 cph with standard vision alignment.