Diodes Incorporated AH3967-WT-7

Overview

AH3967-WT-7 from Diodes Incorporated is a dual Hall-effect latch IC delivering speed and direction outputs for precise rotational sensing in high-voltage industrial systems. It operates from 2.7V to 27V, features chopper-stabilized architecture for ±5 µs output jitter and <±30 G magnetic offset, and delivers open-drain SP/DIR outputs with 11–44 mA current limit - deployed in motor commutation feedback loops requiring robust magnetic polarity discrimination.

For engineers reviewing the AH3967-WT-7 datasheet, AH3967-WT-7 pinout, AH3967-WT-7 application, or AH3967-WT-7 equivalent, key selection criteria include its 50–100 G operating point range, -40°C to +125°C automotive-grade temperature capability, TSOT25 package footprint, and UVLO-triggered output freeze behavior during supply brownout.

Technical Context

The AH3967-WT-7 integrates two independent Hall plates (H1/H2) with matched magnetic thresholds (BOP = +50 to +100 G, BRP = -100 to -50 G) and 120–180 G hysteresis, enabling reliable direction detection via quadrature phase relationship between SP and DIR outputs. Its chopper-stabilized front-end cancels offset drift, achieving <±30 G magnetic matching across temperature and supply voltage.

Internal bandgap regulation supplies temperature-compensated bias to analog blocks, while UVLO (2.0–2.7 V threshold) freezes output state during undervoltage events to prevent erroneous transitions. A Zener clamp (36 V typical) and reverse-blocking diode protect against transients and battery-reverse connection.

Key Specifications

Pinout & Package

Package: TSOT25 (Type A1), 5-pin surface-mount, 2.9 mm × 2.8 mm × 0.8 mm body height, matte tin-plated leads, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual Hall latch with speed/direction output applications.

Compared with AL3967WTT-7, AH3967-WT-7 reduces cost and qualification overhead for industrial applications; versus TLE4964-2M, it eliminates external protection components and supports direct high-voltage bus connection - lowering total solution size and BOM count.

Availability

AH3967-WT-7 is available at Aetrix Electronics and suitable for industrial motor control, white goods, pump monitoring, and conveyor systems requiring stable component supply across extended product lifecycles.

Supply support for AH3967-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.

AH3967-WT-7 belongs to the AH396x dual Hall-effect sensor family, engineered for high-voltage, high-temperature rotational sensing in motor-driven equipment where reliability under electrical stress and thermal cycling is critical.

FAQ

What is the magnetic operating point (BOP) range for AH3967-WT-7?

The AH3967-WT-7 has a nominal operating point of +75 G (typical), with a guaranteed range of +50 G to +100 G at 25°C. This higher sensitivity enables reliable detection with smaller or lower-grade magnets compared to standard Hall latches, making it ideal for compact motor assemblies where magnet size is constrained.

Does AH3967-WT-7 require an external pull-up resistor on SP and DIR outputs?

Yes - both SP and DIR are open-drain outputs and require external pull-up resistors to the desired logic voltage (e.g., 3.3 V, 5 V, or 12 V). Typical values range from 1 kΩ to 10 kΩ depending on rise time requirements and bus capacitance; the device sinks up to 44 mA per output, supporting fast switching into moderate capacitive loads.

How does the undervoltage lockout (UVLO) function affect output behavior?

When VDD falls below the UVLO threshold (2.0–2.7 V), the AH3967-WT-7 freezes its SP and DIR output states until VDD rises above the release threshold. This prevents spurious transitions during power ramp-up or brownout conditions, ensuring downstream logic receives only valid, measurement-based signals - critical for motor control safety integrity.

Can AH3967-WT-7 be used in automotive applications?

The AH3967-WT-7 is rated for -40°C to +125°C and meets industrial reliability standards, but it is not AEC-Q100 qualified. For automotive applications, Diodes offers the pin-compatible AH3967Q variant (documented separately), which includes full AEC-Q100 Grade 0 qualification, enhanced ESD testing, and extended temperature validation per automotive requirements.