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Diodes Incorporated AH3712A-W-7
- Part No.:
- AH3712A-W-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH3712A-W-7.pdf
- Description:
- HALL LATCH SWITCH SC59 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:2,999
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Product details
Overview
AH3712A-W-7 from Diodes Incorporated is a high-voltage, high-sensitivity Hall effect latch IC with bipolar latching behavior (South pole ON / North pole OFF), 3.0V–27V supply range, ±25 G typical operate/release points, open-drain output with internal pull-up resistor, and operation from –40°C to +125°C. It serves as a magnetic position sensor in BLDC motor commutation, flow meters, and linear encoders for industrial and home appliance systems.
For engineers reviewing the AH3712A-W-7 datasheet, AH3712A-W-7 pinout, AH3712A-W-7 application, or AH3712A-W-7 equivalent, this device supports robust contactless sensing in high-noise, wide-temperature, and high-voltage environments-especially where chopper-stabilized offset cancellation, load-dump tolerance up to 40V, and ESD immunity (8 kV HBM) are required.
Technical Context
The AH3712A-W-7 implements a chopper-stabilized architecture with dynamic offset cancellation, delivering minimal switch-point drift (<±0.5 G/°C) and superior temperature stability across –40°C to +125°C. Its internal bandgap regulator supplies temperature-compensated bias to all subcircuits, enabling consistent BOP/BRP thresholds independent of VDD variation.
It features a single open-drain output with integrated 14 kΩ (typ) pull-up resistor, overcurrent limiting (30–60 mA), and fast response: 13 µs start-up time, <10 µs magnetic-to-output delay, and sub-1 µs output rise/fall times under RL = 1 kΩ / CL = 20 pF conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0 V to 27 V - Enables direct integration into 12 V/24 V industrial and appliance power rails without external regulation. |
| Operate Point (BOP) | ±25 G typical - High sensitivity allows detection with small magnets or increased air gaps in mechanical assemblies. |
| Release Point (BRP) | ±25 G typical with 50 G hysteresis - Ensures noise-immune latching and prevents chatter near threshold transitions. |
| Output Type | Open-drain with internal 14 kΩ pull-up - Reduces BOM count by eliminating external resistor; compatible with 3.3 V/5 V/24 V logic interfaces. |
| Start-Up Time | 13 µs typical - Supports high-speed RPM measurement and real-time commutation timing in BLDC motors. |
| ESD Robustness | 8 kV HBM - Withstands handling and board-level ESD events common in manufacturing and field service environments. |
| Load Dump Tolerance | 40 V transient - Survives automotive-grade load dump surges without external protection circuitry. |
| Operating Temperature | –40°C to +125°C - Qualified for under-hood, motor control, and industrial enclosure applications without derating. |
Pinout & Package
Package: SC59 (industry-standard 3-pin surface-mount package, 2.8 mm × 3.0 mm footprint, 0.95 mm height, matte tin-plated leads).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VDD) | Positive supply input | Accepts 3.0–27 V DC; includes internal bandgap regulator and reverse-battery protection (–18 V rating for AH3712/AH3712B variants). |
| 2 (GND) | Ground reference | Common return path for supply and output; must be low-impedance to maintain chopper stabilization integrity. |
| 3 (OUTPUT) | Open-drain output with internal pull-up | Sinks up to 60 mA; pulled high internally to VDD (~14 kΩ); requires no external pull-up for logic-level interfacing. |
Key Features
| Feature | Design Value |
|---|---|
| Chopper-stabilized architecture | Eliminates thermal drift and mechanical stress-induced offset-enabling stable switching thresholds across temperature and mounting strain. |
| Bipolar latch polarity | South pole activates output (low), North pole releases it-ideal for direction-agnostic rotary position sensing and commutation indexing. |
| Integrated pull-up resistor | 14 kΩ (typ) internal resistor simplifies PCB layout, reduces component count, and ensures defined logic-high state during power-up or open-circuit faults. |
| Overcurrent-limited output | 30–60 mA current limit protects internal switch and external loads from short-circuit damage without external fusing. |
| RF noise immunity | Validated performance in noisy motor drive and switching power supply environments-no additional filtering required for basic operation. |
Applications
| BLDC Motor Commutation | Flow Meter Sensing |
|---|---|
Use Scenario: Detecting rotor magnet position to sequence phase winding energization in 3-phase brushless DC motors used in HVAC blowers and power tools. IC Role / Device Role / Timing Role: Bipolar latch providing precise, jitter-free edge timing for electronic commutation at up to 30,000 RPM. Use Value: Enables efficient, silent motor operation with no mechanical wear-leveraging ±25 G sensitivity to support compact magnet designs and tight air gaps. |
Use Scenario: Counting turbine rotations in water/gas metering systems where sealed, maintenance-free sensing is mandatory. IC Role / Device Role / Timing Role: Magnetic zero-crossing detector generating clean digital pulses per revolution for microcontroller-based flow calculation. Use Value: Delivers reliable pulse output over full temperature range (–40°C to +125°C) and 3.0–27 V supply, eliminating battery dependency in utility-grade meters. |
| Linear Encoder Position | Appliance Door/Position Detection |
Use Scenario: Measuring linear displacement in automated dispensers, printer paper-path sensors, or industrial actuator feedback loops. IC Role / Device Role / Timing Role: Latching Hall sensor detecting alternating pole transitions on a magnetic strip to determine absolute position and direction. Use Value: 50 G hysteresis prevents false triggering from vibration or EMI; chopper stabilization maintains accuracy across ambient temperature swings in factory environments. |
Use Scenario: Detecting open/closed state of washing machine drum doors, refrigerator compartments, or robotic vacuum docking stations. IC Role / Device Role / Timing Role: Contactless position switch replacing mechanical microswitches-immune to dust, moisture, and repeated actuation wear. Use Value: Rated for 125°C operation and 8 kV ESD withstand enables long-term reliability in humid, high-cycle consumer appliance enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL3712A-W-7 | Same pinout and electrical specs; manufactured by Allegro MicroSystems with identical BOP/BRP (±25 G), 3–27 V range, and internal pull-up. | Qualified to AEC-Q100 Grade 0 (–40°C to +150°C); preferred for automotive under-hood use where extended junction temperature margin is critical. | Select AL3712A-W-7 only if AEC-Q100 qualification or +150°C junction rating is required; otherwise AH3712A-W-7 offers identical performance at lower cost. |
| SS41F-TB | Unipolar latch (ON with South only); no internal pull-up; 3.5–24 V range; ±35 G BOP; no load-dump rating. | Lacks bipolar latching and hysteresis control-unsuitable for direction-sensitive commutation or noisy environments requiring chatter immunity. | Only consider SS41F-TB for cost-sensitive, unidirectional presence detection where temperature stability and ESD robustness are secondary. |
Compared with AL3712A-W-7, AH3712A-W-7 trades AEC-Q100 qualification for broader industrial availability and lower unit cost; versus SS41F-TB, it delivers true bipolar latching, built-in pull-up, and 40 V load-dump tolerance-making it suitable for demanding commutation and metering applications where reliability is non-negotiable.
Availability
AH3712A-W-7 is available at Aetrix Electronics and suitable for BLDC motor control, flow metering, and industrial position sensing requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for AH3712A-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 company specializing in discrete, analog, and mixed-signal solutions for industrial, computing, consumer, and communications markets.
AH3712A-W-7 belongs to Diodes' Hall-effect sensor product line, engineered for high-reliability contactless position and speed sensing in harsh environments-emphasizing voltage resilience, thermal stability, and system-level noise immunity.
FAQ
What is the function of the internal pull-up resistor in AH3712A-W-7?
The AH3712A-W-7 integrates a 14 kΩ (typ) pull-up resistor between OUTPUT and VDD, ensuring the output defaults to a logic-high state when inactive. This eliminates the need for an external pull-up, simplifies PCB layout, and guarantees defined voltage levels during power-up, reset, or open-load conditions-critical for deterministic microcontroller interface behavior.
Can AH3712A-W-7 operate directly from a 24 V automotive battery?
Yes-AH3712A-W-7 operates continuously from 3.0 V to 27 V and withstands 40 V transients (load dump), making it suitable for direct connection to 24 V vehicle batteries. However, its reverse-battery rating is –18 V only for AH3712/AH3712B variants; AH3712A-W-7 lacks reverse-battery protection, so external polarity protection is recommended in bidirectional battery applications.
How does the chopper-stabilized design improve performance over conventional Hall latches?
Chopper stabilization dynamically cancels offset voltage in the Hall element and amplifier chain, reducing temperature-induced drift to <±0.5 G/°C and minimizing sensitivity to mechanical stress. This yields stable BOP/BRP thresholds across –40°C to +125°C and ensures repeatable switching in thermally cycling or vibration-prone systems like motor housings and flow meters.
Is AH3712A-W-7 pin-compatible with AH3712-W-7 or AH3712B-W-7?
Yes-all three variants share identical SC59 package, pinout (VDD/GND/OUTPUT), and footprint. The difference lies solely in magnetic polarity behavior and internal circuit configuration: AH3712-W-7 is open-drain with no pull-up; AH3712A-W-7 adds internal pull-up; AH3712B-W-7 inverts output logic. No PCB redesign is needed when substituting within the same package code.
AH3712A-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:
- South Pole
- Sensing Range:
- 4mT Trip, -4mT Release
- Test Condition:
- -40°C ~ 125°C
- Voltage - Supply:
- 3V ~ 27V
- Current - Supply (Max):
- 4.8mA
- Current - Output (Max):
- 60mA
- Output Type:
- Open Drain
- Features:
- Temperature Compensated
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-59-3
AH3712A-W-7 FAQ
1.How can I place an order for AH3712A-W-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3712A-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 AH3712A-W-7 reliable?
The price and inventory of AH3712A-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 AH3712A-W-7 is usually 5 days.
3.What payment methods are accepted for AH3712A-W-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3712A-W-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3712A-W-7?
AH3712A-W-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3712A-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 AH3712A-W-7?
For technical support, including AH3712A-W-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3712A-W-7 requirements.
6.How does Aetrix verify that AH3712A-W-7 is sourced from the original manufacturer or authorized distributors?
All AH3712A-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 AH3712A-W-7 meets industry standards.
7.What is the process for return or replacement of AH3712A-W-7?
All AH3712A-W-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH3712A-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 AH3712A-W-7 part is unused and in its original packaging.
Return procedure for AH3712A-W-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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