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Diodes Incorporated AH3712-W-7
- Part No.:
- AH3712-W-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH3712-W-7.pdf
- Description:
- HALL LATCH SWITCH SC59 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:2,999
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Product details
Overview
AH3712-W-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 typical on-state voltage at 20mA.
For engineers reviewing the AH3712-W-7 datasheet, AH3712-W-7 pinout, AH3712-W-7 application, or AH3712-W-7 equivalent, this device supports bipolar latching in SC59 package with verified magnetic threshold hysteresis (50G typ), load-dump tolerance up to 40V, and -40°C to +125°C operation-critical for motor control and flow metering designs requiring robust, low-drift switching.
Technical Context
The AH3712-W-7 implements a chopper-stabilized Hall sensor with dynamic offset cancellation, delivering stable BOP/BRP thresholds across temperature and supply voltage. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, enabling ±25G typical sensitivity with 50G typical hysteresis (BHY) over -40°C to +125°C.
It uses a single-pole latching mechanism: South pole activates the open-drain output (pulled low), North pole releases it (high-impedance state). The output incorporates overcurrent limiting (30–60mA) and exhibits 13µs typical start-up time after VDD reaches 3V, with 500kHz chopping frequency for noise immunity.
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 external regulators. |
| Operate Point (BOP) | ±25G typical - Detects weak magnetic fields for reliable actuation with small or distant magnets. |
| Release Point (BRP) | ±25G typical - Ensures clean, bounce-free latching with 50G typical hysteresis for noise margin. |
| Output Type | Open-drain - Allows flexible pull-up configuration and wired-OR interfacing with microcontrollers or logic inputs. |
| Output Current Limit | 30–60mA - Protects internal switch during short-circuit or heavy capacitive loads without external current-limiting resistors. |
| Start-Up Time | 13µs typical - Guarantees fast system readiness after power-on, critical for real-time RPM measurement. |
| Chopping Frequency | 500kHz - Suppresses low-frequency drift and enhances immunity to mechanical stress and EMI. |
| ESD Rating | HBM: 8kV, CDM: 1kV - Supports robust handling and assembly in high-volume manufacturing environments. |
Pinout & Package
Package: SC59 (industry-standard 3-pin surface-mount package, 3.0mm × 2.8mm footprint, 1.1mm height, matte tin-plated leads, moisture sensitivity level 1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Positive supply input | Accepts 3.0V–27V DC; includes internal bandgap regulator and reverse-battery protection (−18V rating for AH3712 variant). |
| 2 - GND | Ground reference | Common return path for supply and output; must be low-impedance to maintain chopper stability and noise immunity. |
| 3 - OUTPUT | Open-drain output | Sinks up to 60mA; requires external pull-up for logic-high state; internally limited to prevent thermal runaway. |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar Latching Logic | South pole turns output ON (low), North pole turns it OFF (high-Z) - enables precise angular position detection in BLDC rotor indexing. |
| Chopper-Stabilized Architecture | 500kHz modulation eliminates 1/f noise and reduces switch-point drift to <±0.5G/°C - ensures consistent timing in encoder applications. |
| Load-Dump Tolerance | Withstands 40V transients - protects against automotive-style load dump events in industrial power supplies. |
| High-Temperature Operation | Rated from −40°C to +125°C ambient - validated for use inside motor housings and sealed appliance enclosures. |
| RF Noise Immunity | Validated per IEC 61000-4-3 - maintains reliable switching in proximity to motors, inverters, and wireless modules. |
Applications
| BLDC Motor Commutation | RPM Measurement |
|---|---|
|
Use Scenario: Detecting rotor magnet polarity to sequence stator coil energization in 3-phase brushless DC motors used in HVAC blowers and power tools. IC Role / Device Role / Timing Role: Bipolar latch providing synchronized, jitter-free edge transitions for six-step commutation logic. Use Value: Enables precise 60° electrical phase alignment with ±25G sensitivity and 50G hysteresis, eliminating false triggering during rapid acceleration. |
Use Scenario: Counting magnetic pole transitions on rotating shafts in industrial pumps and fan assemblies to calculate real-time rotational speed. IC Role / Device Role / Timing Role: High-speed magnetic event detector with 13µs start-up and sub-microsecond propagation delay. Use Value: Delivers accurate RPM readings up to 100k RPM using 500kHz chopper clock, with minimal latency between field change and output toggle. |
| Flow Meter Sensing | Linear Position Indexing |
|
Use Scenario: Monitoring rotation of turbine or paddle-wheel elements in water/gas meters to infer volumetric flow rate. IC Role / Device Role / Timing Role: Contactless magnetic switch converting mechanical rotation into digital pulse train for microcontroller counting. Use Value: Maintains stable BOP/BRP over 3.0–27V supply and −40°C to +125°C, ensuring metrology-grade repeatability across environmental extremes. |
Use Scenario: Detecting discrete positions of sliding or rotating components in coffee machines, robotic vacuum cleaners, and smart locks. IC Role / Device Role / Timing Role: Latched Hall switch providing non-volatile position state without continuous polling. Use Value: Eliminates contact wear and bounce; ±25G sensitivity allows compact magnet placement, reducing overall module size and cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL3712W-7 (Diodes) | Same SC59 package and pinout; identical BOP/BRP (±25G), but rated only to +105°C ambient and lacks load-dump tolerance (max VDD = 28V). | Not qualified for under-hood or high-temp industrial enclosures where +125°C operation is required. | Select AH3712-W-7 when full automotive-grade thermal range and 40V transient robustness are mandatory. |
| TLE4961-3U (Infineon) | Higher sensitivity (±15G BOP), integrated reverse-polarity protection, but open-drain output limited to 20mA sink and no chopper stabilization. | Lacks hysteresis stability over temperature; unsuitable for precision encoder applications above 85°C. | Choose AH3712-W-7 for applications demanding wide supply range, high-current drive, and superior thermal drift performance. |
Compared with AL3712W-7 and TLE4961-3U, the AH3712-W-7 uniquely combines 40V load-dump tolerance, 60mA output drive, chopper-stabilized 500kHz operation, and full −40°C to +125°C qualification-making it the only option among the three suitable for thermally aggressive, high-reliability motor control systems.
Availability
AH3712-W-7 is available at Aetrix Electronics and suitable for brushless DC motor commutation, flow metering, and linear position indexing requiring stable component supply across industrial temperature ranges and high-voltage transients.
Supply support for AH3712-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, consumer, computing, and automotive markets.
The AH3712 belongs to Diodes' high-voltage Hall effect sensor product line, engineered specifically for robust, temperature-stable magnetic switching in motor control, metering, and position feedback systems operating beyond standard commercial temperature limits.
FAQ
What is the magnetic polarity behavior of the AH3712-W-7?
The AH3712-W-7 is a South-pole-ON, North-pole-OFF bipolar latch: a sufficient South pole applied to the marked side of the SC59 package pulls the open-drain output low (ON), and the state remains latched until a sufficient North pole is applied to release it (high-impedance OFF). This behavior is confirmed in the datasheet's magnetic characteristics table and functional block diagram.
Does the AH3712-W-7 require an external pull-up resistor?
Yes - the AH3712-W-7 has an open-drain output and requires an external pull-up resistor to establish a defined logic-high voltage level. Unlike the AH3712A variant, it does not include an internal pull-up. Recommended values range from 1kΩ to 10kΩ depending on rise-time and bus loading requirements, as shown in the Typical Applications Circuit.
Can the AH3712-W-7 withstand automotive load dump conditions?
Yes - the AH3712-W-7 is rated for 40V transient load dump voltage on VDD, exceeding ISO 7637-2 Pulse 5a requirements (typically 35V for 12V systems). This rating is specified in the Absolute Maximum Ratings table and validated through transient testing per Diodes' internal qualification standards.
What is the purpose of the 10nF–100nF capacitor (CIN) recommended on the VDD pin?
The CIN capacitor stabilizes the internal bandgap-regulated supply and improves RF noise immunity by filtering high-frequency transients on the power rail. The datasheet specifies 10nF to 100nF ceramic capacitance placed as close as possible to the VDD and GND pins, directly supporting chopper-stabilized operation and preventing false triggering in electrically noisy environments.
AH3712-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
AH3712-W-7 FAQ
1.How can I place an order for AH3712-W-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3712-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 AH3712-W-7 reliable?
The price and inventory of AH3712-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 AH3712-W-7 is usually 5 days.
3.What payment methods are accepted for AH3712-W-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3712-W-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3712-W-7?
AH3712-W-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3712-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 AH3712-W-7?
For technical support, including AH3712-W-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3712-W-7 requirements.
6.How does Aetrix verify that AH3712-W-7 is sourced from the original manufacturer or authorized distributors?
All AH3712-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 AH3712-W-7 meets industry standards.
7.What is the process for return or replacement of AH3712-W-7?
All AH3712-W-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH3712-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 AH3712-W-7 part is unused and in its original packaging.
Return procedure for AH3712-W-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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