Diodes Incorporated AH3965-WT-7

Overview

AH3965-WT-7 from Diodes Incorporated is a dual Hall-effect latch IC delivering speed and direction outputs for precise rotational sensing in industrial motor control, white goods, and pump systems. It operates across 2.7V–27V supply, features chopper-stabilized architecture for ±350 ppm/°C magnetic offset drift, includes undervoltage lockout (2.35 V typ), and supports operation from –40°C to +125°C in TSOT25 (Type A1) package.

For engineers reviewing the AH3965-WT-7 datasheet, AH3965-WT-7 pinout, AH3965-WT-7 application, or AH3965-WT-7 equivalent, key selection criteria include its dual-latch magnetic response with open-drain SP/DIR outputs, robust 40 V absolute max supply rating, integrated Zener clamp (36 V), reverse polarity protection, and guaranteed 40 kHz switching frequency under demanding magnetic field conditions.

Technical Context

The AH3965-WT-7 integrates two independent Hall plates (H1, H2) with chopper-stabilized amplifiers and offset cancellation circuitry to deliver synchronized speed (SP) and direction (DIR) outputs. Its internal bandgap regulator supplies temperature-compensated bias to all subcircuits, enabling stable magnetic switching thresholds across –40°C to +125°C.

Output logic is determined by relative magnetic polarity and sequence at each Hall element: CW rotation pulls DIR high while SP toggles; CCW rotation pulls DIR low with corresponding SP transitions. UVLO freezes output state during supply drop below 2.35 V, preventing erroneous measurements during brownout events.

Key Specifications

Pinout & Package

TSOT25 (Type A1) 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 AL3965WTT-7 and TLE4961-2K, the AH3965-WT-7 uniquely combines open-drain flexibility, reverse polarity hardening, and wide magnetic hysteresis-making it optimal for unregulated 24 V industrial motion feedback where field variability and supply transients are common.

Availability

AH3965-WT-7 is available at Aetrix Electronics and suitable for industrial motor feedback, white goods drum rotation, and pump rotor position sensing requiring stable component supply across extended temperature and voltage ranges.

Supply support for AH3965-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 industrial, computing, and consumer markets.

The AH3965 belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust speed-and-direction sensing in harsh environments with wide supply and temperature tolerance.

FAQ

What is the minimum air gap supported between AH3965-WT-7 and a magnet?

The AH3965-WT-7 achieves reliable switching at ±10 G BOP with a typical Hall plate distance of 1.45 mm. For N35 neodymium magnets (Br ≈ 1.18 T), a 1.5 mm air gap yields ~15 G at the sensor surface-within specification. Performance degrades beyond 3 mm unless using stronger magnets or concentrators.

Can AH3965-WT-7 operate directly from a 24 V battery without external regulation?

Yes. The device supports 2.7–27 V supply and includes an internal Zener clamp rated at 36 V (min 39 V breakdown). It also integrates reverse-blocking protection, allowing direct connection to 24 V lead-acid or LiFePO₄ batteries-even with load dump or polarity reversal events.

How does the AH3965-WT-7 handle magnetic field noise near motors?

Its chopper-stabilized architecture operates at 500 kHz, rejecting low-frequency EMI from motor commutation. Combined with 40 kHz max switching bandwidth and 20 ns output jitter, it delivers clean SP/DIR edges even in proximity to brushless motor inverters or solenoid drivers.

Is AH3965-WT-7 qualified for automotive applications?

No-AH3965-WT-7 is not AEC-Q200 qualified. Diodes offers the pin-compatible AH396XQ series (e.g., AH3965Q-WT-7) for automotive use, featuring enhanced ESD, extended qualification testing, and PPAP documentation. AH3965-WT-7 targets industrial and consumer-grade systems.