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Diodes Incorporated AH3976Q-WT-7
- Part No.:
- AH3976Q-WT-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
AH3976Q-WT-7.pdf
- Description:
- HALL LATCH SWITCH TSOT25 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:3,675
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Product details
Overview
AH3976Q-WT-7 from Diodes Incorporated is an AEC-Q100 Grade 0 qualified dual Hall-effect latch IC delivering speed and direction outputs for automotive rotation sensing. It operates from 2.7V to 27V, features chopper-stabilized architecture for ±350 ppm/°C magnetic offset drift, integrated self-diagnostics, and thermal shutdown at +165°C. Used in power closure anti-pinch systems requiring functional safety compliance.
For engineers reviewing the AH3976Q-WT-7 datasheet, AH3976Q-WT-7 pinout, AH3976Q-WT-7 application, or AH3976Q-WT-7 equivalent, key selection criteria include magnetic operating point (BOP = +8 to +42 G), release point (BRP = −42 to −8 G), output saturation voltage (≤0.5 V @ 10 mA), UVLO threshold (2.35 V typ), and TSOT25 package compatibility with IATF16949 production.
Technical Context
The AH3976Q-WT-7 integrates two independent Hall plates (H1/H2) with chopper-stabilized amplifiers, offset cancellation, and S/H circuitry to deliver precise speed and direction signals. Its dual-latch operation enables quadrature decoding of rotating targets without external logic.
Functional safety support includes built-in diagnostics monitoring internal voltage regulator, Hall elements, and output drivers - triggering safe-mode output freeze on fault detection. Undervoltage lockout (2.35 V typ) and overtemperature shutdown (+165°C trip) ensure robust operation across automotive transients and thermal extremes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7 V to 27 V - supports direct battery connection across cold-crank (6.5 V) to load-dump (27 V) conditions |
| Operating Temperature | −40°C to +150°C - qualified for under-hood and transmission-mounted applications |
| Magnetic BOP / BRP | +8 to +42 G / −42 to −8 G - enables reliable detection of small ferrous targets at air gaps up to 1.45 mm |
| Output Type | Open-drain SP & DIR - allows flexible pull-up to 27 V and interface with 3.3 V or 5 V logic |
| UVLO Threshold | 2.35 V (typ) - prevents erroneous switching during brown-out events |
| Thermal Shutdown | +165°C trip / +155°C release - protects against sustained overheating without manual reset |
| ESD Rating | HBM = 5 kV, CDM = 2 kV - exceeds automotive system-level ESD immunity requirements |
Pinout & Package
Package: TSOT25 (Type A1), 5-pin surface-mount, 2.9 mm × 2.8 mm × 0.8 mm, matte tin-plated leads, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Supply input with reverse-blocking diode and 36 V Zener clamp - tolerates −18 V reverse polarity and load-dump spikes |
| 2 | GND | Power ground - dual GND pins (2 & 3) reduce impedance and improve noise immunity |
| 3 | GND | Power ground - electrically tied internally; used for thermal dissipation and low-impedance return path |
| 4 | SP | Speed output - open-drain, active-low, 25 mA current limit, ≤0.5 V saturation at 10 mA |
| 5 | DIR | Direction output - open-drain, active-high for clockwise rotation per datasheet timing diagram |
Key Features
| Feature | Design Value |
|---|---|
| Dual Hall latch with speed & direction outputs | Enables real-time rotational direction detection without external XOR logic or microcontroller intervention |
| Chopper-stabilized architecture | Reduces magnetic offset drift to ±350 ppm/°C - maintains accuracy over full −40°C to +150°C range |
| Integrated self-diagnostics | Monitors Hall plates, regulator, and output stage - asserts safe mode on fault, meeting ASIL-B readiness per ISO 26262 |
| Battery reverse polarity protection | Internal blocking diode + Zener clamp eliminates need for external protection components in 12 V/24 V systems |
| UVLO + thermal shutdown + auto-restart | Ensures deterministic behavior during supply collapse or overheating - no latching failure or manual recovery required |
Applications
| Power Closure Anti-Pinch | Transmission Speed & Direction Sensing |
|---|---|
Use Scenario: Motor-driven sunroof or window lift with pinch-detection logic. IC Role / Device Role / Timing Role: Dual-output Hall sensor providing real-time speed and direction to MCU for position tracking and stall detection. Use Value: Enables accurate reversal on obstruction without additional encoders or current-sense circuits. | Use Scenario: Gear tooth sensing on transmission output shaft for vehicle speed and shift control. IC Role / Device Role / Timing Role: Magnetic speed/direction latch feeding CAN or SENT interface with minimal latency (tD = 13 µs typ). Use Value: Delivers jitter-free quadrature signals up to 60 kHz, supporting high-resolution RPM calculation. |
| Steering Angle Monitoring | Electric Power Steering (EPS) Motor Commutation |
Use Scenario: Rotary position feedback for column-mounted steering angle sensor. IC Role / Device Role / Timing Role: Direction-sensitive latch detecting clockwise/counterclockwise rotation of steering wheel. Use Value: Provides absolute direction change detection with <±1 G magnetic hysteresis, eliminating ambiguity in slow-turn scenarios. | Use Scenario: Rotor position sensing for brushless DC motor commutation in EPS actuator. IC Role / Device Role / Timing Role: Dual Hall element generating commutation timing edges with <500 ns count signal delay (tDC). Use Value: Enables precise 6-step commutation with minimal phase lag, improving torque ripple and efficiency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual Hall latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Melexis MLX92232LSE-AAA-025-RE | 3.3 V only supply; differential outputs; no integrated Zener clamp or reverse polarity protection | Requires external protection circuitry; limited to low-voltage modules not exposed to battery transients | Select when system uses regulated 3.3 V rail and space constraints favor smaller SOIC-8 footprint |
| NXP TLE4961-2K | Single-output latch; requires external logic for direction; higher BOP (±40 G); no self-diagnostics | Suitable for cost-sensitive non-functional-safety applications where direction is derived externally | Select when direction logic resides in MCU and ASIL-B compliance is not required |
Compared with MLX92232LSE-AAA-025-RE and TLE4961-2K, the AH3976Q-WT-7 uniquely combines wide-supply operation (2.7–27 V), integrated safety diagnostics, and dual open-drain outputs in a single TSOT25 package - reducing BOM count and enabling direct replacement in AEC-Q100 Grade 0 designs.
Availability
AH3976Q-WT-7 is available at Aetrix Electronics and suitable for automotive power closures, transmission speed sensing, steering angle monitoring, and EPS motor commutation requiring stable component supply across extended temperature and voltage ranges.
Supply support for AH3976Q-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 IATF16949-certified manufacturing.
The AH397xQ series belongs to Diodes' automotive Hall-effect sensor product line, designed specifically for functional safety–compliant speed and direction sensing in harsh environments - targeting ASIL-B readiness and zero-defect reliability.
FAQ
What is the magnetic sensitivity configuration of AH3976Q-WT-7?
The AH3976Q-WT-7 has asymmetric magnetic thresholds: BOP = +8 to +42 G (south pole activation) and BRP = −42 to −8 G (north pole release), with 32–68 G hysteresis. This configuration enables robust detection of rotating ferrous targets with minimal false triggering due to vibration or field noise.
Does AH3976Q-WT-7 require external pull-up resistors?
Yes - both SP and DIR outputs are open-drain and require external pull-up resistors. Typical values range from 1 kΩ to 10 kΩ depending on bus voltage and rise time requirements. The device supports pull-up to any voltage ≤27 V, independent of VDD.
How does the self-diagnostic function operate during normal use?
The self-diagnostics continuously monitor Hall plate bias, internal regulator output, and output driver integrity. If a fault is detected, the device freezes both outputs in their last valid state and enters safe mode - no toggling occurs until power cycle or recovery from UVLO/thermal event.
Can AH3976Q-WT-7 be used in 24 V commercial vehicle applications?
Yes - its 2.7 V to 27 V supply range, −40°C to +150°C operation, 36 V Zener clamp, and −18 V reverse voltage rating make it fully compatible with 24 V truck and bus electrical systems, including load-dump and jump-start conditions.
AH3976Q-WT-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Bulk
- 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 ~ 150°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 ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-25 (Type A1)
AH3976Q-WT-7 FAQ
1.How can I place an order for AH3976Q-WT-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3976Q-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 AH3976Q-WT-7 reliable?
The price and inventory of AH3976Q-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 AH3976Q-WT-7 is usually 5 days.
3.What payment methods are accepted for AH3976Q-WT-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3976Q-WT-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3976Q-WT-7?
AH3976Q-WT-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3976Q-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 AH3976Q-WT-7?
For technical support, including AH3976Q-WT-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3976Q-WT-7 requirements.
6.How does Aetrix verify that AH3976Q-WT-7 is sourced from the original manufacturer or authorized distributors?
All AH3976Q-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 AH3976Q-WT-7 meets industry standards.
7.What is the process for return or replacement of AH3976Q-WT-7?
All AH3976Q-WT-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH3976Q-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 AH3976Q-WT-7 part is unused and in its original packaging.
Return procedure for AH3976Q-WT-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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