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Diodes Incorporated AH3712-SA-7
- Part No.:
- AH3712-SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH3712-SA-7.pdf
- Description:
- HALL LATCH SWITCH SSOT23 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:2,738
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Product details
Overview
AH3712-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 chopper-stabilized architecture for temperature stability, and delivers open-drain output with 60mA current limit and 0.25V on-state voltage at 20mA.
For engineers reviewing the AH3712-SA-7 datasheet, AH3712-SA-7 pinout, AH3712-SA-7 application, or AH3712-SA-7 equivalent, this device supports bipolar latching in SOT23 (Type S) package with South-pole-on/North-pole-off polarity, load-dump tolerance up to 40V, and -40°C to +125°C operation - critical for robust motor control and flow metering designs.
Technical Context
The AH3712-SA-7 implements a chopper-stabilized Hall sensor with dynamic offset cancellation, delivering stable magnetic switching thresholds across temperature and supply voltage. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, enabling ±25G BOP/BRP with 50G typical hysteresis (BHY) over -40°C to +125°C.
It integrates an output power switch with overcurrent limiting (30–60mA), reverse-battery protection (-18V), and RF noise immunity. The open-drain output requires external pull-up and sinks current when activated by sufficient South-pole flux density perpendicular to the package marking side.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0V to 27V - enables direct integration into 12V/24V industrial and appliance power rails without LDO. |
| Operate Point (BOP) | ±25G typical - ensures reliable activation with low-strength magnets in compact encoders or small BLDC rotors. |
| Release Point (BRP) | ±25G typical - provides clean hysteresis to prevent chatter near threshold in noisy mechanical environments. |
| Output On Voltage | 0.25V max at 20mA - minimizes power loss and heat generation during sustained switching in motor commutation. |
| Start-Up Time | 13µs typical - allows rapid system response after power-on, supporting high-RPM motor timing requirements. |
| Chopping Frequency | 500kHz - suppresses 1/f noise and enables stable DC magnetic field detection under thermal drift. |
| ESD Robustness | HBM 8kV / CDM 1kV - protects against handling and board-level ESD events in automated assembly lines. |
Pinout & Package
Package: SOT23 (Type S), 3-pin, lead-free, RoHS-compliant surface-mount package with 2.9mm × 2.4mm footprint and 1.0mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Positive supply input | Accepts 3.0–27V; withstands transient load dump up to 40V - eliminates need for external TVS in 24V systems. |
| 2 - GND | Ground reference | Common return for internal regulator, Hall element, and output stage; must be low-impedance for noise immunity. |
| 3 - OUTPUT | Open-drain output | Sinks up to 60mA; requires external pull-up; active-low latched state driven by South-pole magnetic field. |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latch operation | South-pole activation / North-pole deactivation - enables precise rotor position tracking in 2-phase BLDC commutation. |
| Chopper-stabilized architecture | 500kHz chopping frequency - reduces thermal drift of BOP/BRP to <±0.5G/°C, ensuring consistent timing over temperature. |
| High-voltage tolerance | 40V transient rating on VDD - sustains automotive-grade load dump pulses without external protection circuitry. |
| Overcurrent-limited output | 60mA max sink current - prevents latch damage during short-circuit or capacitive load transients in encoder interfaces. |
| RF noise immunity | Validated performance in >100MHz EMI environments - maintains clean switching in proximity to motor drivers and SMPS. |
Applications
| Brushless DC Motor Commutation | RPM Measurement in Flow Meters |
|---|---|
|
Use Scenario: Detecting rotor pole transitions in 3-phase BLDC fans used in HVAC and kitchen appliances. IC Role / Device Role / Timing Role: Bipolar latch providing synchronized, jitter-free commutation signals to gate driver ICs. Use Value: Enables precise 120° electrical phase alignment with ±25G sensitivity, reducing torque ripple and acoustic noise. |
Use Scenario: Counting magnet passes on turbine blades in residential water flow meters. IC Role / Device Role / Timing Role: Magnetic zero-crossing detector converting mechanical rotation into digital pulse train. Use Value: Delivers 13µs start-up and stable 50G hysteresis to reject vibration-induced false counts at low flow rates. |
| Linear Position Sensing | Contactless Angular Indexing |
|
Use Scenario: Measuring linear displacement of actuator rods in smart home locks and robotic vacuum cleaners. IC Role / Device Role / Timing Role: Latching Hall sensor detecting magnet position along a rail with repeatable edge timing. Use Value: Maintains ±25G operate/release points across -40°C to +125°C, eliminating calibration drift in uncontrolled environments. |
Use Scenario: Detecting angular index marks on rotating shafts in office equipment like printers and scanners. IC Role / Device Role / Timing Role: Edge-triggered position marker for homing and speed feedback in stepper-driven mechanisms. Use Value: Open-drain output interfaces directly with 3.3V/5V microcontrollers; 0.25V on-state ensures logic-low margin under worst-case loading. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL3712QSA-7 | Automotive-qualified (AEC-Q100 Grade 1), identical pinout and BOP/BRP specs, but rated for -40°C to +150°C junction temp. | Required for under-hood automotive BLDC pumps or EPS sensors; not needed for consumer appliance use. | Select AL3712QSA-7 only if AEC-Q100 compliance and extended junction temperature are mandatory. |
| US1881LUA-AAA-000 | Lower voltage range (2.5–24V), ±35G BOP/BRP, no load-dump tolerance (max VDD = 28V), no reverse-battery protection. | Suitable for cost-sensitive 12V-only applications where 40V transient immunity is unnecessary. | Choose US1881LUA-AAA-000 only if supply is tightly regulated and automotive transients are absent. |
Compared with AH3712-SA-7, AL3712QSA-7 adds automotive qualification and higher junction temperature margin at premium cost, while US1881LUA-AAA-000 trades transient robustness and temperature stability for lower price in benign 12V environments.
Availability
AH3712-SA-7 is available at Aetrix Electronics and suitable for brushless DC motor commutation, flow metering, linear position sensing, and contactless angular indexing requiring stable component supply across industrial and consumer production programs.
Supply support for AH3712-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 power management, signal integrity, and sensing solutions for industrial and consumer markets.
The AH3712 belongs to Diodes' high-voltage Hall effect sensor product line, engineered specifically for robust magnetic position detection in noisy, wide-temperature, and high-transient environments such as motor control and fluid measurement systems.
FAQ
What is the magnetic polarity configuration of AH3712-SA-7?
AH3712-SA-7 is configured as a South-pole-on/North-pole-off bipolar latch. When a South pole with sufficient flux density (>25G typical) is applied to the marked side of the SOT23 package, the open-drain output switches low and remains latched until a North pole (<−25G) is applied to release it. This polarity is fixed per the SA suffix and cannot be inverted externally.
Does AH3712-SA-7 require an external pull-up resistor?
Yes - AH3712-SA-7 has an open-drain output and requires an external pull-up resistor to define the high-state voltage level. Typical values range from 1kΩ to 10kΩ depending on rise-time and bus voltage. Unlike the AH3712A variant, it does not include an internal pull-up resistor; its output stage is purely N-channel MOSFET with no integrated termination.
Can AH3712-SA-7 operate directly from a 24V automotive battery?
Yes - AH3712-SA-7 supports continuous operation from 3.0V to 27V and withstands transient load-dump events up to 40V for short durations. It also includes reverse-battery protection down to −18V, making it suitable for direct connection to 24V vehicle power systems without additional protection circuitry in non-safety-critical applications.
How does the chopper-stabilized architecture improve performance?
The 500kHz chopper-stabilized design continuously modulates the Hall element's bias and amplifies the signal at AC, then demodulates it back to DC. This cancels offset voltage drift caused by temperature, stress, and process variation - resulting in <±0.5G/°C BOP/BRP drift and stable switching thresholds across the full −40°C to +125°C range without calibration.
AH3712-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
AH3712-SA-7 FAQ
1.How can I place an order for AH3712-SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3712-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 AH3712-SA-7 reliable?
The price and inventory of AH3712-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 AH3712-SA-7 is usually 5 days.
3.What payment methods are accepted for AH3712-SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3712-SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3712-SA-7?
AH3712-SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3712-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 AH3712-SA-7?
For technical support, including AH3712-SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3712-SA-7 requirements.
6.How does Aetrix verify that AH3712-SA-7 is sourced from the original manufacturer or authorized distributors?
All AH3712-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 AH3712-SA-7 meets industry standards.
7.What is the process for return or replacement of AH3712-SA-7?
All AH3712-SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH3712-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 AH3712-SA-7 part is unused and in its original packaging.
Return procedure for AH3712-SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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