Diodes Incorporated AH3968Q-WT-7

Overview

AH3968Q-WT-7 from Diodes Incorporated is an AEC-Q100 Grade 0 qualified dual Hall-effect latch IC delivering two independent open-drain speed outputs (Q1 and Q2) for precise rotational direction and speed sensing in automotive systems. It operates from 2.7V to 27V, features chopper-stabilized architecture for ±5 µs output jitter, supports -40°C to +150°C ambient operation, and integrates reverse polarity protection and UVLO for robustness in power closure and motor control applications.

For engineers reviewing the AH3968Q-WT-7 datasheet, AH3968Q-WT-7 pinout, AH3968Q-WT-7 application, or AH3968Q-WT-7 equivalent, this page delivers verified magnetic thresholds (±50–100 G BOP/BRP), TSOT25 package layout, dual-output timing behavior (tDC = 50–1000 ns), Zener clamp voltage (36 V), and AEC-Q100 qualification evidence required for automotive sensor selection.

Technical Context

The AH3968Q employs two independent Hall plates (H1 and H2) with matched magnetic switching points (BOP/BRP ±50–100 G, hysteresis 120–180 G) and chopper stabilization to suppress offset drift across temperature. Its dual-output architecture generates asynchronous Q1 and Q2 signals whose phase relationship encodes rotation direction-no external logic required.

Internal circuitry includes a bandgap-regulated voltage reference, UVLO (2.0–2.7 V threshold), reverse-blocking diode with 36 V Zener clamp, and ESD protection (5 kV HBM, 2 kV CDM). All functions operate reliably over the full -40°C to +150°C junction range with supply current under 7 mA at 27 V.

Key Specifications

Pinout & Package

TSOT25 (Type A1) surface-mount package: 2.9 mm × 2.8 mm × 0.8 mm body, 0.95 mm pitch, matte tin-plated leads, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AH3968Q-WT-7, AL3968Q-WT-7 offers identical performance with no design impact, while TLE4968-2C trades simplicity for diagnostics and programmability at the cost of footprint and integration effort.

Availability

AH3968Q-WT-7 is available at Aetrix Electronics and suitable for automotive power closures, motor feedback systems, rotary controls, and transmission sensing requiring stable component supply across extended temperature and voltage ranges.

Supply support for AH3968Q-WT-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions for automotive, industrial, and consumer markets, with IATF 16949-certified manufacturing.

AH3968Q belongs to the AH396xQ automotive Hall-effect sensor family, designed specifically for robust, high-accuracy speed and direction sensing in safety-critical vehicle subsystems.

FAQ

What is the magnetic sensitivity difference between AH3968Q and AH3965Q?

AH3968Q uses matched Hall elements with ±50–100 G operating points and 120–180 G hysteresis optimized for dual-speed output decoding, whereas AH3965Q has asymmetric ±10 G/±30 G thresholds intended for speed-and-direction (SP/DIR) mode. The AH3968Q's tighter magnetic matching (<±30 G offset) enables higher-resolution quadrature counting.

Can AH3968Q-WT-7 drive standard 5 V logic inputs directly?

Yes - its open-drain outputs support pull-up to any voltage ≤27 V. When pulled to 5 V with a 10 kΩ resistor, output saturation voltage remains ≤0.5 V at 10 mA, ensuring clean TTL/CMOS logic low levels. No level-shifting circuitry is required.

Does AH3968Q require external capacitors for stable operation?

A 10 nF ceramic capacitor between VDD and GND is recommended per the datasheet typical application circuit. This stabilizes the internal bandgap regulator and suppresses supply noise that could affect Hall plate accuracy, especially in high-EMI automotive environments.

How does the UVLO feature behave during cold-cranking conditions?

When VDD falls below 2.0–2.7 V, UVLO freezes the output state (holds last valid Q1/Q2 level) until supply recovers above threshold. This prevents spurious pulses during engine start, where battery voltage can dip to 6 V for <100 ms - ensuring downstream MCU receives only valid rotation data.