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Diodes Incorporated AH3761-WG-7
- Part No.:
- AH3761-WG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH3761-WG-7.pdf
- Description:
- MAGNETIC SWITCH LATCH SC59-3
- Quantity:
- Payment:
- Shipping:
Inventory:28,215
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Product details
Overview
AH3761-WG-7 from Diodes Incorporated is a high-sensitivity Hall-effect latched sensor in SC59 (SOT23) package, designed for brushless DC motor commutation and RPM detection. It operates from 3V to 28V, features chopper stabilization, open-drain output with 70mA typical current limit, and magnetic operate/release points of ±30G (Bop/Brp), enabling reliable position sensing in rotating systems.
For engineers reviewing the AH3761-WG-7 datasheet, AH3761-WG-7 pinout, AH3761-WG-7 application, or AH3761-WG-7 equivalent, key selection criteria include its 30G magnetic hysteresis, 24V-rated open-drain output, -40°C to +125°C operating range, and SC59 thermal derating profile up to 125°C ambient.
Technical Context
The AH3761-WG-7 integrates a Hall voltage generator, low-noise amplifier, dynamic offset cancellation circuitry, and Schmitt-trigger output stage - all powered by an internal bandgap regulator. Its chopper-stabilized architecture eliminates thermal drift and 1/f noise, ensuring stable switching thresholds across temperature.
It delivers latch behavior: output turns low when B > +30G (Bop), remains latched until B reverses and falls below –30G (Brp). The open-drain output supports external pull-up to voltages up to 30V, with 300mV saturation voltage at 20mA load and 20ns falling time into 16pF load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3V to 28V - enables direct connection to 12V/24V automotive and industrial rails without external regulation |
| Magnetic Operate Point (Bop) | +5G to +60G typ. +30G - detects weak magnetic fields from small ferrite or NdFeB magnets at air gaps up to 3mm |
| Magnetic Release Point (Brp) | –60G to –5G typ. –30G - provides 60G hysteresis to reject mechanical vibration and EMI-induced false triggers |
| Output Type | Open-drain N-channel MOSFET - allows level-shifting, wired-OR logic, and direct interface to microcontroller GPIO or gate drivers |
| Output Current Limit | 50–90mA typ. 70mA - protects against sustained short-circuit while driving LED indicators or small MOSFET gates |
| Start-up Time | 47µs - ensures rapid system readiness after power-on, critical for motor startup sequencing |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial motor control environments |
Pinout & Package
Package: SC59 (equivalent to SOT23-3), surface-mount, halogen-free "Green" molding compound, lead-free and RoHS 3 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vdd | Positive power supply input | Accepts 3–28V DC; powers internal regulator and sensing circuitry; reverse-polarity protected |
| GND | Ground reference | Common return path for Hall element, amplifier, and output stage; must be low-impedance for noise immunity |
| OUT | Open-drain output terminal | Sinks up to 70mA; requires external pull-up; asserts low during magnetic field presence above Bop |
Key Features
| Feature | Design Value |
|---|---|
| Chopper stabilization | Eliminates offset drift and 1/f noise, enabling stable 30G switching thresholds over –40°C to +125°C |
| Built-in reverse polarity protection | Withstands –30V reverse battery connection without damage - essential for automotive 12V systems |
| Voltage overshoot protection | Clamps transients up to 30V on Vdd - suppresses load-dump spikes common in BLDC motor drive circuits |
| Output short-circuit protection | Auto-recovery after 160µs fault duration - prevents latch-up during wiring faults or PCB shorts |
| Green packaging | Halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb); fully RoHS 3 compliant per EU Directive 2015/863/EU |
Applications
| BLDC Motor Commutation | RPM Detection |
|---|---|
Use Scenario: Sensing rotor magnet position in 3-phase brushless DC motors for electronic commutation timing. IC Role / Device Role / Timing Role: Latched Hall sensor providing synchronized edge-triggered signals to motor controller ICs (e.g., DRV8305). Use Value: Enables precise 120° electrical phase alignment with ±30G hysteresis, reducing torque ripple and acoustic noise in fan/pump drives. |
Use Scenario: Monitoring rotational speed of shaft-mounted magnets in HVAC blowers or industrial conveyors. IC Role / Device Role / Timing Role: Digital pulse generator converting magnetic transitions into clean TTL-compatible square waves. Use Value: Delivers 20ns falling time and 340ns rising time into 10kΩ/16pF loads, supporting accurate frequency measurement up to 10kHz. |
| Industrial Position Sensor | Flow Meter Sensing |
Use Scenario: Detecting end-of-travel or valve actuation in pneumatic/hydraulic cylinders using embedded magnets. IC Role / Device Role / Timing Role: Solid-state proximity switch replacing mechanical limit switches in harsh environments. Use Value: Withstands –40°C to +125°C ambient and 28V supply, eliminating contact wear and enabling IP67-rated sealed assemblies. |
Use Scenario: Counting turbine rotations in water/gas flow meters via embedded magnet on impeller. IC Role / Device Role / Timing Role: Magnetic zero-crossing detector generating pulses proportional to volumetric flow rate. Use Value: 60G hysteresis rejects vibration-induced chatter; open-drain output interfaces directly to meter MCU's interrupt-capable GPIO. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL3761QUTW-7 | Automotive-grade AEC-Q100 qualified; identical SC59 package and pinout; tighter Bop/Brp tolerance (±15G vs ±30G) | Required for automotive powertrain modules; not needed for industrial fans or consumer appliances | Select if AEC-Q100 compliance and extended temperature validation (-40°C to +150°C) are mandatory |
| US1881LUA-AB | Higher Bop (+60G min); no chopper stabilization; 5V-only supply; TO-92 package | Limited to low-voltage, non-automotive applications with stronger magnetic fields and less EMI sensitivity | Choose only for cost-sensitive, low-temp, fixed-rail designs where chopper stability and wide voltage range are unnecessary |
Compared with AL3761QUTW-7 and US1881LUA-AB, the AH3761-WG-7 offers optimal balance of wide supply range (3–28V), chopper-stabilized accuracy, and industrial-grade reliability - making it preferred for non-automotive BLDC systems requiring robustness without AEC-Q100 overhead.
Availability
AH3761-WG-7 is available at Aetrix Electronics and suitable for brushless DC motor commutation, RPM detection, and industrial position sensing requiring stable component supply despite its NRND status.
Supply support for AH3761-WG-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, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
The AH3761 belongs to Diodes' Hall-effect sensor product line, engineered specifically for high-reliability rotational sensing in motor control and industrial automation systems where precision, noise immunity, and wide supply operation are critical.
FAQ
Is AH3761-WG-7 still manufacturable, and what does NRND mean for new designs?
AH3761-WG-7 is Not Recommended for New Design (NRND) per Diodes' ordering information, indicating active production but no long-term commitment for future releases. It remains available in 3000-unit tape-and-reel quantities and is supported for legacy program continuity, though migration paths like AL3761QUTW-7 should be evaluated for new projects.
Can AH3761-WG-7 replace AH3774 in existing designs?
No - AH3774 is a bipolar Hall switch with different magnetic thresholds (Bop = ±40G, Brp = ∓30G) and no chopper stabilization. AH3761-WG-7 has asymmetric latching behavior (Bop = +30G, Brp = –30G) and superior noise immunity. Direct substitution may cause erratic switching in vibration-prone environments.
What is the maximum allowable continuous output current for AH3761-WG-7 at 85°C ambient?
At 85°C ambient, the SC59 package's power dissipation limit is 110mW. With VO(SAT) ≤500mV at 20mA, the device safely sinks 70mA peak but must be limited to ≤40mA continuous to maintain junction temperature below 150°C - verified via thermal resistance θJC = 543°C/W and derating curves in DS31977 Rev. 3–4.
Does AH3761-WG-7 require an external pull-up resistor, and what value is recommended?
Yes - the open-drain OUT pin requires an external pull-up. For 24V systems, a 10kΩ resistor limits current to ~2.4mA at logic high and ensures <1µs rise time with typical PCB capacitance. Lower values (e.g., 4.7kΩ) improve noise immunity in EMI-heavy motor drive environments but increase static power draw.
AH3761-WG-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:
- 6mT Trip, -6mT Release
- Test Condition:
- 25°C
- Voltage - Supply:
- 3V ~ 28V
- Current - Supply (Max):
- 6mA
- Current - Output (Max):
- 100mA
- Output Type:
- Open Drain
- Features:
- Temperature Compensated
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-59-3
AH3761-WG-7 FAQ
1.How can I place an order for AH3761-WG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3761-WG-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 AH3761-WG-7 reliable?
The price and inventory of AH3761-WG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH3761-WG-7 is usually 5 days.
3.What payment methods are accepted for AH3761-WG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3761-WG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3761-WG-7?
AH3761-WG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3761-WG-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 AH3761-WG-7?
For technical support, including AH3761-WG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3761-WG-7 requirements.
6.How does Aetrix verify that AH3761-WG-7 is sourced from the original manufacturer or authorized distributors?
All AH3761-WG-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 AH3761-WG-7 meets industry standards.
7.What is the process for return or replacement of AH3761-WG-7?
All AH3761-WG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH3761-WG-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 AH3761-WG-7 part is unused and in its original packaging.
Return procedure for AH3761-WG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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