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Diodes Incorporated AH3712Q-W-7
- Part No.:
- AH3712Q-W-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH3712Q-W-7.pdf
- Description:
- MAGNETIC SWITCH LATCH SC59
- Quantity:
- Payment:
- Shipping:
Inventory:1,652
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Product details
Overview
AH3712Q-W-7 from Diodes Incorporated is an AEC-Q100 qualified, automotive-grade Hall-effect bipolar latch IC in SC59 package, designed for brushless DC motor commutation and angular position sensing. It operates from 3.0V to 27V, delivers ±25G typical operate/release points (BOP/BRP), features chopper-stabilized architecture for <0.42V output saturation at 20mA, and supports -40°C to +150°C ambient operation in harsh automotive environments.
For engineers reviewing the AH3712Q-W-7 datasheet, AH3712Q-W-7 pinout, AH3712Q-W-7 application, or AH3712Q-W-7 equivalent, this device is selected for high-voltage robustness, magnetic hysteresis stability across temperature, open-drain switching with overcurrent protection, and polarity-specific mounting orientation in SC59 packages.
Technical Context
The AH3712Q-W-7 implements a chopper-stabilized Hall sensor with dynamic offset cancellation, low-pass filtering, and internal bandgap-regulated supply to maintain stable BOP/BRP thresholds across voltage and temperature. Its functional block includes sample-and-hold amplification, power switching, and current limiting on the open-drain output stage.
Magnetic actuation is polarity-sensitive: for SC59 packaging, the South pole must approach the non-part-marking side to turn on the output (pulled low), and the North pole to release it-ensuring latched state retention until field reversal exceeds hysteresis (BHY = 50G typ). The device integrates reverse-blocking diode and Zener clamp on VDD for battery-reversal and transient protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0V to 27V - Enables direct connection to automotive 12V/24V battery rails without external regulation. |
| Operating Temperature | -40°C to +150°C - Qualified for under-hood and transmission-mounted applications per AEC-Q100 Grade 0. |
| BOP / BRP | ±25G typical - High sensitivity enables reliable detection with small magnets or air gaps in motor rotor position sensing. |
| VOUT_ON | 0.25V–0.42V @ 20mA - Low saturation voltage ensures minimal power loss and compatible interfacing with 3.3V/5V logic inputs. |
| Output Type | Open-drain - Allows flexible pull-up configuration (external or internal via AH3712AQ variant) and wired-OR bus capability. |
| ESD Robustness | HBM: 8kV, CDM: 1kV - Meets automotive ESD immunity requirements for assembly and field operation. |
| Output Current Limit | 30–60mA - Protects against short-circuit faults while sustaining sufficient drive for typical optocoupler or MCU input loads. |
Pinout & Package
Package: SC59 (3-pin, surface-mount, industry-standard leaded package with 1.6mm × 2.8mm footprint and 1.0mm height).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Power supply input - Accepts 3.0V–27V; includes integrated reverse-blocking diode and 36V Zener clamp for load-dump and reverse-battery protection. |
| 2 | GND | Ground reference - Serves as return path for internal circuitry and output sink current; requires low-impedance PCB connection. |
| 3 | OUTPUT | Open-drain output - Sinks up to 60mA; requires external pull-up resistor; switches low when B > BOP (South pole on non-marking side) and latches until B < BRP (North pole applied). |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latch operation | South pole activates, North pole releases - Enables precise, repeatable commutation timing in BLDC motors without continuous field monitoring. |
| Chopper-stabilized architecture | 500kHz chopping frequency - Reduces thermal drift of BOP/BRP to <±1.5G over -40°C to +150°C, eliminating manual calibration. |
| Integrated protection | Reverse-blocking diode + 36V Zener clamp on VDD - Withstands -18V reverse battery and 40V transients without external components. |
| High magnetic hysteresis | 50G typical (|BOP| − |BRP|) - Prevents output chatter near threshold in noisy mechanical environments like gear tooth sensing. |
| RF noise immunity | Validated per ISO 11452-2 - Maintains stable switching in presence of 10–1000MHz radiated RF fields common in infotainment-rich vehicle cabins. |
Applications
| Brushless DC Motor Commutation | RPM Measurement in Automotive Fans |
|---|---|
Use Scenario: Detecting rotor magnet polarity to sequence stator coil energization in electric power steering (EPS) motors. IC Role / Device Role / Timing Role: Bipolar latch providing edge-triggered, latched Hall signal synchronized to rotor position for 6-step commutation control. Use Value: Enables precise 120° electrical phase alignment with <1µs propagation delay, supporting >15,000 RPM operation at full temperature range. |
Use Scenario: Counting gear teeth on HVAC blower motor shaft to derive real-time fan speed feedback for closed-loop control. IC Role / Device Role / Timing Role: Magnetic zero-crossing detector generating clean digital pulses per tooth passage for frequency-to-voltage conversion. Use Value: Delivers jitter <5µs at 10kHz pulse rate, enabling ±1% RPM accuracy even under engine vibration and EMI exposure. |
| Linear Position Sensing in Throttle Bodies | Contactless Angular Indexing in Transmission Sensors |
Use Scenario: Monitoring throttle plate angle via linear magnet displacement in drive-by-wire systems. IC Role / Device Role / Timing Role: Threshold-based latch detecting magnet proximity to fixed reference points for discrete position states (idle, partial, wide-open). Use Value: Achieves <±0.5° mechanical resolution using 25G BOP tolerance and 50G hysteresis, eliminating contact wear and bounce issues. |
Use Scenario: Identifying gear selector position (P/R/N/D) by sensing magnet orientation on rotating cam in automatic transmission shift actuators. IC Role / Device Role / Timing Role: Direction-sensitive latch capturing absolute angular index via sequential South/North pole transitions across multiple poles. Use Value: Supports fail-safe dual-sensor redundancy schemes with <10µs start-up time after ignition, meeting ASIL-B diagnostic timing requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL3712Q-W-7 | Same pinout and BOP/BRP specs, but lower ESD rating (HBM 4kV vs 8kV) and no AEC-Q100 qualification. | Restricted to non-safety-critical industrial fans or consumer appliances-not approved for automotive PPAP. | Select only if cost sensitivity outweighs automotive compliance and long-term reliability validation. |
| TLE4961-3M | Higher supply range (4.5V–36V), integrated pull-up, but larger SOIC-8 package and slower 20µs start-up time. | Better suited for high-voltage commercial vehicles; less optimal for space-constrained EPS modules requiring SC59 footprint. | Prefer when system-level voltage margin exceeds 27V or board layout allows SOIC-8 placement. |
Compared with AL3712Q-W-7, AH3712Q-W-7 provides certified automotive robustness and higher ESD immunity; versus TLE4961-3M, it offers smaller SC59 footprint and faster start-up, trading off voltage headroom and integrated pull-up convenience.
Availability
AH3712Q-W-7 is available at Aetrix Electronics and suitable for brushless DC motor commutation, automotive RPM measurement, throttle position sensing, and transmission indexing requiring stable component supply across extended temperature and voltage ranges.
Supply support for AH3712Q-W-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 with IATF 16949-certified automotive production facilities.
The AH3712Q belongs to Diodes' AEC-Q100-qualified Hall-effect sensor product line, engineered specifically for high-reliability position and speed sensing in automotive powertrain, chassis, and body control modules.
FAQ
What is the correct magnet polarity orientation for AH3712Q-W-7 in SC59 package?
For the SC59 package, the South pole must be presented to the non-part-marking side of the device to activate the output (pull low), and the North pole to the same side to release it. This is opposite to SOT23/SIP-3 variants and is defined by internal die orientation-misalignment causes failure to switch. Mounting diagrams are provided in DS45415 Figure 1.
Does AH3712Q-W-7 require an external bypass capacitor?
Yes-a 10nF to 100nF ceramic capacitor (CIN) between VDD and GND is required per the datasheet to stabilize the internal regulator and suppress high-frequency noise. Omitting it increases susceptibility to RF interference and may cause erratic output toggling during load dump events.
Can AH3712Q-W-7 drive an LED directly?
No-the open-drain output sinks up to 60mA but lacks internal current regulation. Driving an LED requires an external series resistor sized for forward voltage and desired current; exceeding 60mA risks triggering the output current limit, causing voltage droop and potential thermal shutdown.
Is the AH3712Q-W-7 pin-compatible with AH3712AQ-W-7?
No-AH3712AQ-W-7 integrates a 14kΩ internal pull-up resistor, while AH3712Q-W-7 has no internal pull-up and requires external biasing. Both share identical pinout and package, but substituting one for the other without adjusting external circuitry will result in undefined or floating output states.
AH3712Q-W-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Latch
- Technology:
- Hall Effect
- Polarization:
- North Pole, South Pole
- Sensing Range:
- 4mT Trip, -4mT Release
- Test Condition:
- -40°C ~ 150°C
- Voltage - Supply:
- 3V ~ 27V
- Current - Supply (Max):
- 3.8mA
- Current - Output (Max):
- 60mA
- Output Type:
- Open Drain
- Features:
- Temperature Compensated
- Operating Temperature:
- -40°C ~ 150°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-59-3
AH3712Q-W-7 FAQ
1.How can I place an order for AH3712Q-W-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3712Q-W-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 AH3712Q-W-7 reliable?
The price and inventory of AH3712Q-W-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH3712Q-W-7 is usually 5 days.
3.What payment methods are accepted for AH3712Q-W-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3712Q-W-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3712Q-W-7?
AH3712Q-W-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3712Q-W-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 AH3712Q-W-7?
For technical support, including AH3712Q-W-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3712Q-W-7 requirements.
6.How does Aetrix verify that AH3712Q-W-7 is sourced from the original manufacturer or authorized distributors?
All AH3712Q-W-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 AH3712Q-W-7 meets industry standards.
7.What is the process for return or replacement of AH3712Q-W-7?
All AH3712Q-W-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH3712Q-W-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 AH3712Q-W-7 part is unused and in its original packaging.
Return procedure for AH3712Q-W-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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