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Diodes Incorporated AH3712A-SA-7
- Part No.:
- AH3712A-SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH3712A-SA-7.pdf
- Description:
- HALL LATCH SWITCH SSOT23 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:2,967
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Product details
Overview
AH3712A-SA-7 from Diodes Incorporated is a high-voltage, high-sensitivity Hall effect latch IC designed for brushless DC motor commutation and position sensing in industrial appliances and personal care devices. It operates from 3.0V to 27V, features ±25G typical operate/release points (BOP/BRP), includes internal pull-up resistor (14 kΩ typ), and delivers open-drain output with overcurrent limiting (60 mA max) in SOT23 (Type S) package.
For engineers reviewing the AH3712A-SA-7 datasheet, AH3712A-SA-7 pinout, AH3712A-SA-7 application, or AH3712A-SA-7 equivalent, this device supports robust magnetic sensing in high-temperature (–40°C to +125°C), high-noise, and load-dump-prone environments-critical for motor control, flow metering, and linear encoder designs requiring stable bipolar latching behavior.
Technical Context
The AH3712A-SA-7 implements 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 hysteresis (50 G typ) regardless of supply voltage (3V–27V).
This latch uses South-pole-on/North-pole-off polarity with direct output logic and integrates an internal 14 kΩ pull-up resistor-eliminating external components in single-supply configurations. The output stage includes active current limiting (30–60 mA) and withstands transient load dump up to 40V, making it suitable for automotive-adjacent industrial power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0V to 27V - Enables direct integration into 12V/24V industrial systems without LDO pre-regulation. |
| Operate Point (BOP) | ±25G typical - High sensitivity allows detection with small magnets or increased air gaps in mechanical assemblies. |
| Release Point (BRP) | ±25G typical - Matches BOP magnitude for symmetrical hysteresis, preventing chatter near threshold transitions. |
| Output Type | Open-drain with internal 14 kΩ pull-up - Reduces BOM count and PCB footprint in unidirectional sensing applications. |
| Operating Temperature | –40°C to +125°C - Validated for under-hood or enclosed motor-drive environments without derating. |
| Load Dump Withstand | 40V transient - Survives ISO 7637-2 Pulse 5a surges common in 24V battery-fed equipment. |
| Start-Up Time | 13 µs typical - Ensures rapid system readiness after power-on, critical for real-time RPM measurement. |
| ESD Robustness | HBM 8 kV / CDM 1 kV - Supports handling and assembly in standard manufacturing lines without special ESD controls. |
Pinout & Package
Package: SOT23 (Type S), 3-pin surface-mount, RoHS-compliant, lead-free, halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Positive supply input | Accepts 3.0V–27V DC; internal bandgap regulator derives stable bias for analog core and logic. |
| 2 - GND | Ground reference | Common return path for supply, Hall sensor, and output stage; must be low-impedance for noise immunity. |
| 3 - OUTPUT | Open-drain output with internal pull-up | Sinks current when latched ON (South pole detected); pulled high internally-no external resistor required. |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latch operation | South-pole activation / North-pole release ensures reliable direction-sensitive commutation in BLDC rotors. |
| Chopper-stabilized sensing | Eliminates thermal drift and 1/f noise, maintaining ±0.5 G/°C BOP stability over full temperature range. |
| Integrated 14 kΩ pull-up | Reduces component count and layout complexity in single-rail systems while ensuring clean logic-high idle state. |
| Overcurrent-limited output | Clamps sink current at 30–60 mA, protecting internal MOSFET and external loads during short-circuit events. |
| RF noise immunity | Validated against conducted and radiated interference per IEC 61000-4-6, supporting operation in noisy motor drive environments. |
Applications
| BLDC Motor Commutation | Flow Meter Sensing |
|---|---|
|
Use Scenario: Detecting rotor magnet position in 3-phase brushless DC fans used in HVAC and kitchen appliances. IC Role / Device Role / Timing Role: Bipolar latch provides precise, jitter-free edge timing for electronic commutation signals driving gate drivers. Use Value: Enables accurate 6-step commutation with <13 µs start-up latency and no external pull-up, reducing bill-of-materials cost by one resistor per phase. |
Use Scenario: Monitoring turbine rotation in residential water meters using embedded permanent magnets on impeller blades. IC Role / Device Role / Timing Role: Latching output generates clean digital pulses per revolution, directly interfacing with microcontroller GPIO or timer capture inputs. Use Value: ±25G sensitivity allows use of low-cost ferrite magnets at 2–3 mm air gap; 125°C rating supports sealed, thermally insulated meter housings. |
| Linear Encoder Position | Contactless Speed Sensing |
|
Use Scenario: Measuring linear displacement in smart toothbrush actuators or massage device stroke length via magnet-embedded slider. IC Role / Device Role / Timing Role: Provides absolute position feedback through alternating South/North pole detection along a magnetic strip. Use Value: Symmetrical ±25G thresholds ensure repeatable 0.5 mm resolution at 10 mm/s travel speed, with no calibration needed across temperature. |
Use Scenario: Measuring rotational speed of drum motors in washing machines using a multi-pole ring magnet mounted on shaft. IC Role / Device Role / Timing Role: Generates consistent pulse train synchronized to magnet pole transitions for RPM calculation in MCU firmware. Use Value: 40V load-dump tolerance prevents latch-up during motor back-EMF transients; 8 kV HBM ESD protects against static discharge during service access. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL3712A-SR-7 | Same pinout and sensitivity, but rated only to +105°C ambient and lacks 40V load-dump rating. | Not qualified for high-temp industrial enclosures or 24V battery-fed equipment with surge risk. | Select only if operating ambient stays ≤+105°C and system has external TVS protection. |
| US1881EUA-AAA-3 | Lower sensitivity (±35G), no internal pull-up, requires external 10 kΩ resistor; 30V max supply. | Needs additional passive component and cannot replace AH3712A-SA-7 in space-constrained layouts. | Choose only when cost is primary constraint and board area permits external pull-up placement. |
Compared with AL3712A-SR-7 and US1881EUA-AAA-3, the AH3712A-SA-7 uniquely combines extended temperature range (+125°C), integrated pull-up, and 40V surge tolerance-making it the sole option for compact, high-reliability motor control in thermally demanding consumer appliances.
Availability
AH3712A-SA-7 is available at Aetrix Electronics and suitable for brushless DC motor commutation, flow metering, and linear position sensing requiring stable component supply across industrial appliance production cycles, personal care device volume ramps, and white-goods replacement programs.
Supply support for AH3712A-SA-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability signal integrity, power management, and sensing solutions for industrial and consumer markets.
The AH3712 series belongs to Diodes' high-voltage Hall latch product line, engineered specifically for robust magnetic position detection in noisy, thermally variable, and electrically stressed environments such as motor-driven home appliances and portable personal care devices.
FAQ
What is the function of the internal pull-up resistor in AH3712A-SA-7?
The internal 14 kΩ pull-up resistor ensures the OUTPUT pin defaults to a logic-high state when inactive, eliminating the need for an external pull-up component. This simplifies PCB layout and reduces BOM count in single-supply applications like BLDC fan controllers, while maintaining compatibility with standard 3.3V/5V microcontroller inputs.
Can AH3712A-SA-7 operate reliably at 27V supply with continuous load?
Yes-AH3712A-SA-7 is fully specified for continuous operation at 27V across –40°C to +125°C. Its thermal design in SOT23 (Type S) supports 230 mW dissipation at 25°C ambient, and internal current limiting prevents thermal runaway even under sustained 60 mA output sink conditions.
How does the chopper-stabilized architecture improve performance?
Chopper stabilization dynamically cancels offset voltage in the Hall sensor amplifier, reducing temperature-induced drift to <±0.5 G/°C and suppressing 1/f noise. This enables stable BOP/BRP thresholds across voltage and temperature-critical for repeatable commutation timing in variable-speed motor drives.
Is AH3712A-SA-7 pin-compatible with AH3712-SA-7 or AH3712B-SA-7?
Yes-all three variants share identical SOT23 (Type S) pinout (VDD, GND, OUTPUT) and footprint. However, AH3712-SA-7 requires an external pull-up, AH3712B-SA-7 provides inverted logic, and only AH3712A-SA-7 integrates the pull-up resistor; functional substitution requires verifying polarity and interface requirements.
AH3712A-SA-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:
- SOT-23-3
AH3712A-SA-7 FAQ
1.How can I place an order for AH3712A-SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3712A-SA-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-SA-7 reliable?
The price and inventory of AH3712A-SA-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-SA-7 is usually 5 days.
3.What payment methods are accepted for AH3712A-SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3712A-SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3712A-SA-7?
AH3712A-SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3712A-SA-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-SA-7?
For technical support, including AH3712A-SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3712A-SA-7 requirements.
6.How does Aetrix verify that AH3712A-SA-7 is sourced from the original manufacturer or authorized distributors?
All AH3712A-SA-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-SA-7 meets industry standards.
7.What is the process for return or replacement of AH3712A-SA-7?
All AH3712A-SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH3712A-SA-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-SA-7 part is unused and in its original packaging.
Return procedure for AH3712A-SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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