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Diodes Incorporated AH3975Q-WT-7
- Part No.:
- AH3975Q-WT-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
AH3975Q-WT-7.pdf
- Description:
- HALL LATCH SWITCH TSOT25 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:4,649
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Product details
Overview
AH3975Q-WT-7 from Diodes Incorporated is an AEC-Q100 Grade 0 qualified dual Hall-effect latch IC for automotive speed and direction sensing, featuring open-drain SP (speed) and DIR (direction) outputs, 2.7V–27V supply operation, chopper-stabilized architecture for ±350 ppm/°C magnetic offset TC, and integrated self-diagnostics for ISO 26262 functional safety compliance in power closure anti-pinch systems.
For engineers reviewing the AH3975Q-WT-7 datasheet, AH3975Q-WT-7 pinout, AH3975Q-WT-7 application, or AH3975Q-WT-7 equivalent, this device delivers validated magnetic switching performance (BOP = ±10 G, BRP = –30 to +10 G), thermal shutdown at +165°C, UVLO at 2.35 V, and robust protection including reverse polarity blocking, Zener clamp (36 V), and 5 kV HBM ESD - all in TSOT25 (Type A1) package.
Technical Context
The AH3975Q-WT-7 implements two independent Hall plates (H1, H2) with chopper-stabilized amplifiers and offset cancellation, enabling precise differential magnetic field detection for direction discrimination. Its dual-latch logic interprets relative timing between SP and DIR edges to determine rotation direction (CW/CCW), with count signal delay tDC specified at 400 ns max.
Internal bandgap regulation provides temperature-compensated biasing across –40°C to +150°C ambient, while diagnostic blocks continuously monitor Hall plate functionality, voltage regulator output, and output driver integrity. Upon fault detection, the device enters safe mode with defined output states, satisfying ASIL-B functional safety requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7 V to 27 V - supports direct battery connection in 12 V/24 V automotive systems without external regulators |
| Operating Temperature | –40°C to +150°C - qualified for under-hood and transmission-mounted applications |
| Speed/Direction Outputs | SP and DIR, open-drain - enables flexible pull-up configuration and direct interface to microcontroller GPIOs or dedicated motor control ICs |
| Magnetic Switch Points | BOP = ±10 G, BRP = –30 to +10 G - provides reliable latching over wide air gaps and mechanical tolerances in rotating targets |
| Output Current Limit | 11 mA to 44 mA - ensures stable drive into typical 1 kΩ pull-ups while preventing thermal runaway |
| UVLO Threshold | 2.35 V (typ) - prevents erroneous output transitions during cold-crank or brown-out conditions |
| Thermal Shutdown | +165°C (trip), +155°C (release) - protects against sustained overtemperature in enclosed assemblies |
Pinout & Package
TSOT25 (Type A1) surface-mount package: 2.9 mm × 2.8 mm × 0.8 mm, 5-pin, matte tin-plated leads, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Positive supply input - accepts 2.7–27 V with integrated reverse-blocking diode and 36 V Zener clamp |
| 2 | GND | Analog/digital ground reference - dual GND pins (2 & 3) reduce ground bounce in high-speed switching |
| 3 | GND | Second ground terminal - improves thermal dissipation and noise immunity in noisy automotive environments |
| 4 | SP | Speed output, open-drain - active-low pulse train synchronized to magnetic pole transitions; sinks up to 44 mA |
| 5 | DIR | Direction output, open-drain - low for CCW, high for CW rotation; phase relationship to SP defines direction logic |
Key Features
| Feature | Design Value |
|---|---|
| Dual Hall latch with speed & direction outputs | Enables single-sensor angular velocity and directional motion detection without external logic or microcontroller intervention |
| Chopper-stabilized architecture | Reduces magnetic offset drift to ±350 ppm/°C and minimizes switch point hysteresis variation across temperature |
| Integrated self-diagnostics | Monitors Hall plate health, regulator stability, and output driver integrity; forces safe-state outputs on fault detection |
| AEC-Q100 Grade 0 & ISO 26262 readiness | Validated for 168 °C junction operation and functional safety integration in ASIL-B systems such as window lift control |
| Robust protection suite | Includes reverse polarity blocking, 36 V Zener clamp, UVLO, overtemperature shutdown with auto-restart, and 5 kV HBM ESD |
Applications
| Power Closure Anti-Pinch | Transmission Speed Sensing |
|---|---|
|
Use Scenario: Automotive power window or sunroof module detecting obstacle contact via reversal of motor direction. IC Role / Device Role / Timing Role: Dual Hall latch provides real-time speed pulses and direction edge transitions to MCU for position tracking and pinch-force inference. Use Value: Enables sub-10 µs response delay (tD = 13 µs typ) and jitter-controlled outputs (±5 µs) for accurate stall detection within 2–3 motor steps. |
Use Scenario: Gear position and output shaft speed monitoring in automatic transmission control units. IC Role / Device Role / Timing Role: Mounted on transmission housing to sense rotating gear teeth; SP/DIR signals feed transmission control algorithm for shift timing and slip detection. Use Value: Wide 2.7–27 V supply range accommodates battery transients; magnetic matching <25 G ensures consistent BOP/BRP across dual Hall elements for reliable direction resolution. |
| Steering Angle Feedback | Electric Power Steering Motor Commutation |
|
Use Scenario: Non-contact steering column angle measurement using multi-pole ring magnet. IC Role / Device Role / Timing Role: Provides quadrature-like SP/DIR outputs to MCU for absolute angle reconstruction via pulse counting and edge sequencing. Use Value: Chopper stabilization maintains <1.45 mm Hall plate spacing tolerance and ±10 G BOP accuracy over full –40°C to +150°C range. |
Use Scenario: Rotor position feedback for brushless DC motor commutation in EPS assist motors. IC Role / Device Role / Timing Role: Delivers direction-resolved speed pulses to motor gate driver IC or MCU for six-step commutation timing. Use Value: 60 kHz max switching frequency supports >10,000 RPM rotor speeds; tR/tF <1 µs ensures clean edge definition for precise timing windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Melexis MLX92232LSE-AAA-025-RE | Single-output Hall latch with internal pull-up; no native direction output - requires external XOR logic for direction derivation | Lacks integrated DIR function; suitable only where direction is derived externally or not required | Select when cost-sensitive designs can accept added PCB area and logic complexity for direction decoding |
| Allegro A1262LLHLT-T | Single Hall-effect switch (not dual); no direction output; lower temp grade (–40°C to +150°C but not AEC-Q100 Grade 0) | Only provides speed pulses; lacks functional safety diagnostics and automotive qualification for safety-critical zones | Use only in non-safety-critical cabin applications where direction sensing is unnecessary and AEC-Q100 Grade 0 is not mandated |
Compared with MLX92232 and A1262, the AH3975Q-WT-7 uniquely integrates both speed and direction outputs with ASIL-B-ready diagnostics in a single TSOT25 package, eliminating external logic while meeting stringent automotive reliability and safety requirements.
Availability
AH3975Q-WT-7 is available at Aetrix Electronics and suitable for automotive power closures, transmission speed sensing, steering angle feedback, and electric power steering motor commutation requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant traceability.
Supply support for AH3975Q-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 devices for automotive, industrial, and computing markets, with IATF16949-certified manufacturing facilities.
The AH3975Q-WT-7 belongs to Diodes' automotive Hall-effect sensor product line, engineered specifically for functional safety–compliant rotational and linear motion sensing in ASIL-B systems such as anti-pinch modules and transmission controls.
FAQ
What is the magnetic operating point (BOP) and release point (BRP) for AH3975Q-WT-7?
The AH3975Q-WT-7 has a magnetic operating point BOP of ±10 G and release point BRP of –30 G to +10 G, measured at TA = –40°C to +150°C and VDD = 2.7 V to 27 V. These values enable reliable latching with typical 1.45 mm Hall plate spacing and support air gaps up to 3 mm with standard ferrite magnets.
Does AH3975Q-WT-7 require external pull-up resistors on SP and DIR outputs?
Yes - SP and DIR are open-drain outputs and require external pull-up resistors to VDD or another logic rail. Typical values range from 1 kΩ to 10 kΩ depending on rise time requirements and bus capacitance; 1 kΩ yields tR/tF ≤1 µs with CL = 50 pF per the datasheet.
How does the self-diagnostic function operate during normal use?
The self-diagnostics continuously monitor Hall plate functionality, internal voltage regulator output, and output driver integrity. If a fault is detected - such as Hall element failure or regulator dropout - the device asserts both SP and DIR outputs into a defined safe state (high-impedance or logic-high depending on fault type) and maintains it until reset by power cycle or recovery of monitored parameters.
Can AH3975Q-WT-7 be used in 48 V automotive systems?
No - the absolute maximum supply voltage is 40 V, and recommended operation is limited to 27 V. For 48 V architectures, external voltage regulation to ≤27 V is required. The device's 36 V Zener clamp protects against transients but does not support continuous 48 V operation.
AH3975Q-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:
- 3mT Trip, -3mT 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)
AH3975Q-WT-7 FAQ
1.How can I place an order for AH3975Q-WT-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3975Q-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 AH3975Q-WT-7 reliable?
The price and inventory of AH3975Q-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 AH3975Q-WT-7 is usually 5 days.
3.What payment methods are accepted for AH3975Q-WT-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3975Q-WT-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3975Q-WT-7?
AH3975Q-WT-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3975Q-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 AH3975Q-WT-7?
For technical support, including AH3975Q-WT-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3975Q-WT-7 requirements.
6.How does Aetrix verify that AH3975Q-WT-7 is sourced from the original manufacturer or authorized distributors?
All AH3975Q-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 AH3975Q-WT-7 meets industry standards.
7.What is the process for return or replacement of AH3975Q-WT-7?
All AH3975Q-WT-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH3975Q-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 AH3975Q-WT-7 part is unused and in its original packaging.
Return procedure for AH3975Q-WT-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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