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Diodes Incorporated AH3966-WT-7
- Part No.:
- AH3966-WT-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
AH3966-WT-7.pdf
- Description:
- HALL LATCH SWITCH TSOT25 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:2,998
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Product details
Overview
AH3966-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 stability, -40°C to +125°C operation, and open-drain SP/DIR outputs with 0.2 V saturation at 10 mA.
For engineers reviewing the AH3966-WT-7 datasheet, AH3966-WT-7 pinout, AH3966-WT-7 application, or AH3966-WT-7 equivalent, this device supports robust speed/direction decoding in high-noise environments with UVLO, reverse polarity protection, and 5 kV HBM ESD rating - critical for motor feedback and angular position detection circuits.
Technical Context
The AH3966-WT-7 integrates two independent Hall plates (H1/H2) with chopper-stabilized amplifiers and offset cancellation circuitry, enabling accurate differential magnetic field detection. Its dual-latch logic decodes rotation direction by comparing sequential state transitions of SP and DIR outputs, with timing controlled by internal 500 kHz chopping frequency and <13 µs power-on delay.
Internal bandgap regulation supplies temperature-compensated bias to analog blocks, while UVLO (2.35 V typical) freezes output states during brownout conditions. The device uses a TSOT25 (Type A1) package with dual GND pins for low-impedance return paths and Zener clamp (36 V) on VDD for transient spike suppression.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 2.7 V to 27 V - enables direct connection to 3.3 V, 5 V, 12 V, and 24 V industrial rails without external regulators |
| Operating temperature | -40°C to +125°C - qualified for under-hood automotive-adjacent and industrial motor drive environments |
| Output type | Open-drain SP & DIR - allows flexible pull-up to any logic rail up to 27 V and wired-OR interfacing |
| Speed/direction resolution | BOP = +8 to +42 G, BRP = -42 to -8 G - provides 32 G hysteresis for reliable edge discrimination in rotating gear applications |
| Response delay | 13 µs typical - supports up to 60 kHz switching frequency for high-RPM motor commutation feedback |
| ESD rating | HBM = 5 kV, CDM = 2 kV - exceeds IEC 61000-4-2 Level 4 for system-level EMC robustness |
| UVLO threshold | 2.35 V typical - prevents erroneous output toggling during power ramp-up or battery sag below functional margin |
Pinout & Package
TSOT25 (Type A1) surface-mount package: 2.9 mm × 2.8 mm × 0.8 mm, matte tin-plated leads, moisture sensitivity level 1, 0.016 g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Supply input with integrated Zener clamp (36 V) and UVLO detection - accepts wide-input rails with transient overvoltage tolerance |
| 2 | GND | Primary ground reference for analog core and output drivers - low-inductance path critical for noise immunity |
| 3 | GND | Secondary ground terminal - reduces thermal resistance and improves current return path separation for dual-output stability |
| 4 | SP | Speed output, open-drain - active-low pulse train synchronized to magnetic pole transitions; sinks up to 25 mA |
| 5 | DIR | Direction output, open-drain - high = clockwise rotation, low = counterclockwise; matches mechanical encoder phase relationship |
Key Features
| Feature | Design Value |
|---|---|
| Dual Hall latch with speed & direction outputs | Eliminates need for external XOR logic or microcontroller-based direction decoding in BLDC motor controllers |
| Chopper-stabilized architecture | Reduces magnetic offset drift to ±350 ppm/°C - maintains accuracy across full -40°C to +125°C range without calibration |
| Reverse polarity & transient protection | Integrated blocking diode and 36 V Zener clamp enable direct battery connection in 12 V/24 V systems without external protection |
| Undervoltage lockout (UVLO) | Freezes output state below 2.35 V - prevents false pulses during startup or brownout, ensuring deterministic behavior in safety-critical feedback loops |
| High ESD robustness | 5 kV HBM rating allows handling and PCB assembly without special ESD controls - reduces manufacturing yield loss |
Applications
| Industrial Motor Feedback | White Goods Drum Rotation |
|---|---|
Use Scenario: Monitoring rotor position and RPM in 3-phase BLDC compressors and fans. IC Role / Device Role / Timing Role: Dual-latch Hall sensor providing synchronized SP/DIR signals for six-step commutation timing and direction validation. Use Value: Enables closed-loop speed control with <13 µs response delay and 60 kHz max switching frequency - supports >3600 RPM operation with sub-degree angular resolution. |
Use Scenario: Detecting drum spin direction and speed in washing machine direct-drive motors. IC Role / Device Role / Timing Role: Direction-sensitive latch generating real-time CW/CCW status and pulse-counted RPM for load balancing and imbalance correction. Use Value: Magnetic hysteresis (32 G) rejects vibration-induced false triggers; wide 2.7–27 V supply accommodates variable battery-backed backup power during main AC loss. |
| Pump Flow Direction Sensing | Angular Position Detection |
Use Scenario: Verifying bidirectional flow in HVAC circulation pumps and medical infusion devices. IC Role / Device Role / Timing Role: Speed-and-direction decoder interfaced to microcontroller GPIOs to determine fluid movement vector and validate valve actuation sequence. Use Value: Open-drain outputs tolerate 27 V pull-ups - compatible with existing 24 V PLC I/O modules without level-shifting components. |
Use Scenario: Measuring absolute angular position via multi-pole ring magnet and interpolation in robotic joint encoders. IC Role / Device Role / Timing Role: High-precision magnetic latch capturing pole transitions with <±5 µs jitter - feeds time-of-flight data to FPGA-based angle calculation engine. Use Value: Chopper stabilization ensures <0.2 V output saturation at 10 mA across temperature - maintains clean digital edges for high-resolution timing capture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual Hall latch with speed and direction output applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Allegro A1220LLHLT-T | Single-output Hall switch (speed only); no direction output; BOP/BRP ±30 G; 3.3–24 V supply | Requires external XOR logic or MCU firmware to derive direction - increases BOM count and firmware complexity | Select when direction sensing is not required or when space constraints preclude dual-output ICs |
| Melexis US5881SEB-AAA-000-SP | Dual-output Hall latch with programmable sensitivity (BOP/BRP adjustable via external resistor); 2.7–24 V supply; 4 kV HBM ESD | Supports field calibration for varying air gaps but adds external component and layout sensitivity | Select when magnetic gap varies significantly across production units and factory calibration is impractical |
Compared with A1220LLHLT-T and US5881SEB-AAA-000-SP, the AH3966-WT-7 delivers integrated direction logic, wider 27 V absolute max supply, and superior 5 kV HBM ESD - reducing system-level protection components and simplifying firmware for motor control applications requiring deterministic speed/direction feedback.
Availability
AH3966-WT-7 is available at Aetrix Electronics and suitable for industrial motor feedback, white goods drum rotation, and pump flow direction sensing requiring stable component supply across extended temperature and voltage ranges.
Supply support for AH3966-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 manufacturer specializing in discrete, analog, and mixed-signal solutions for industrial, computing, consumer, and automotive markets.
The AH3966-WT-7 belongs to Diodes' high-voltage Hall-effect sensor product line, engineered specifically for robust rotational sensing in noisy, wide-supply industrial environments where reliability and temperature stability are critical.
FAQ
What is the magnetic sensitivity range of the AH3966-WT-7?
The AH3966-WT-7 has an operating point (BOP) of +8 G to +42 G and release point (BRP) of -42 G to -8 G, yielding 32 G typical hysteresis. This range is optimized for standard ferrous gear tooth sensing at 0.5–2 mm air gaps and remains stable across -40°C to +125°C due to chopper stabilization and temperature-compensated biasing.
Can AH3966-WT-7 be used with 3.3 V microcontrollers?
Yes - its open-drain SP and DIR outputs are compatible with 3.3 V logic when pulled up to 3.3 V. The device operates down to 2.7 V supply, so it can be powered directly from a 3.3 V rail. Output saturation voltage is ≤0.2 V at 10 mA, ensuring solid low-state margin for 3.3 V CMOS inputs.
How does the undervoltage lockout (UVLO) function protect system integrity?
When VDD falls below 2.35 V (typical), UVLO freezes the SP and DIR output states until supply recovers above threshold. This prevents erratic toggling during power-up, brownout, or battery sag - ensuring downstream logic receives only valid, measurement-based outputs and avoiding false commutation commands in motor drives.
Is AH3966-WT-7 pin-compatible with other members of the AH396x family?
Yes - all AH396x variants (AH3965/AH3966/AH3967/AH3968) share identical TSOT25 (Type A1) pinout and footprint. However, output functionality differs: AH3966 provides SP/DIR, while AH3968 provides Q1/Q2 dual-speed outputs. Electrical characteristics like BOP/BRP values also vary per part number.
AH3966-WT-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Latch, Dual
- Technology:
- Hall Effect
- Polarization:
- North Pole, South Pole
- Sensing Range:
- 4.2mT Trip, -4.2mT Release
- Test Condition:
- -40°C ~ 125°C
- Voltage - Supply:
- 2.7V ~ 27V
- Current - Supply (Max):
- 7mA
- Current - Output (Max):
- 44mA
- Output Type:
- Open Drain
- Features:
- Temperature Compensated
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-25 (Type A1)
AH3966-WT-7 FAQ
1.How can I place an order for AH3966-WT-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3966-WT-7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AH3966-WT-7 reliable?
The price and inventory of AH3966-WT-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH3966-WT-7 is usually 5 days.
3.What payment methods are accepted for AH3966-WT-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3966-WT-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3966-WT-7?
AH3966-WT-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3966-WT-7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AH3966-WT-7?
For technical support, including AH3966-WT-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3966-WT-7 requirements.
6.How does Aetrix verify that AH3966-WT-7 is sourced from the original manufacturer or authorized distributors?
All AH3966-WT-7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AH3966-WT-7 meets industry standards.
7.What is the process for return or replacement of AH3966-WT-7?
All AH3966-WT-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH3966-WT-7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AH3966-WT-7 part is unused and in its original packaging.
Return procedure for AH3966-WT-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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