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Diodes Incorporated AH337-WL-7
- Part No.:
- AH337-WL-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH337-WL-7.pdf
- Description:
- IC HALL SWITCH 1PH 25MA SC59-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,936
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Product details
Overview
AH337-WL-7 from Diodes Incorporated is a unipolar Hall-effect switch in SC59 (SOT23) package, designed for contactless magnetic sensing and switching. It operates from 4.2V to 28V, features temperature-compensated magnetic thresholds (Bop = 120 G typ, Brp = 60 G typ), delivers 25 mA sink current, and functions across –40°C to +125°C ambient. Used in cover detection, speed measurement, and home appliance safety interlocks.
For engineers reviewing the AH337-WL-7 datasheet, AH337-WL-7 pinout, AH337-WL-7 application, or AH337-WL-7 equivalent, this page provides verified technical context, validated pin assignments, real-world use cases, and confirmed alternatives - all grounded in Diodes' DS31050 Rev. 13–4 datasheet and official package documentation.
Technical Context
The AH337-WL-7 integrates a Hall voltage generator, amplifier, Schmitt trigger with 60 G hysteresis, and open-collector output stage. Its band-gap regulator enables stable operation across 4.2–28 V supply, while magnetic response remains functional over –40°C to +125°C with full temperature compensation.
It switches ON when south-pole flux density exceeds Bop (90–150 G), holds state until flux falls below Brp (30–90 G), and exhibits <0.1 µA leakage in OFF state. Output saturation voltage is ≤400 mV at 10 mA, supporting direct drive of small relays or logic-level inputs without external pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.2 V to 28 V - supports wide-input industrial and automotive battery systems without external regulation |
| Output Type | Open-collector - allows flexible pull-up selection and wired-OR interfacing with other digital signals |
| Sink Current | 25 mA max - directly drives LEDs, small solenoids, or microcontroller GPIOs with internal pull-up |
| Magnetic Thresholds | Bop = 120 G typ, Brp = 60 G typ - ensures reliable actuation with common ferrite magnets at air gaps up to 3 mm |
| Hysteresis | 60 G - prevents chatter during slow or noisy magnetic transitions near switching point |
| Operating Temp | –40°C to +125°C - qualified for under-hood and industrial enclosure environments |
| Package | SC59 (SOT23) - surface-mount, footprint-compatible with standard SOT23 pick-and-place equipment |
Pinout & Package
SC59 (SOT23) package: 3-pin, single-row, gull-wing leads; 2.8 mm × 2.9 mm body, 0.95 mm height; RoHS-compliant, halogen-free "Green" construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vdd | Power input | Positive supply rail; must exceed 4.5 V for guaranteed magnetic performance per Note 4 |
| GND | Ground reference | Return path for Hall sensor, amplifier, and output stage; requires low-impedance connection |
| OUT | Open-collector output | Sinks current when active; requires external pull-up resistor (typically 1–10 kΩ) to define logic HIGH level |
Key Features
| Feature | Design Value |
|---|---|
| Unipolar magnetic response | Activates only with south pole facing branded side - simplifies mechanical design by eliminating polarity ambiguity |
| Temperature compensation | Magnetic thresholds remain stable across –40°C to +125°C - eliminates need for system-level calibration |
| Wide supply range | Operates down to 4.2 V - compatible with partially discharged 12 V batteries or regulated 5 V/3.3 V rails |
| Low quiescent current | 2–4 mA typical supply current - suitable for always-on sensing in battery-powered appliances |
| RoHS & Green compliance | Lead-free, halogen-free (<900 ppm Br/Cl, <1000 ppm Sb) - meets global environmental and automotive sourcing requirements |
Applications
| Cover Detection | CD/DVD Loader Position Sensing |
|---|---|
Use Scenario: Detecting closure of appliance doors, printer covers, or safety guards. IC Role / Device Role / Timing Role: Unipolar Hall switch providing digital ON/OFF status based on magnet proximity. Use Value: Eliminates mechanical switches prone to wear; enables fail-safe interlock with no moving contacts. |
Use Scenario: Confirming tray-in position and spindle readiness in optical disc drives. IC Role / Device Role / Timing Role: Magnetic position detector triggering motor enable and laser activation sequences. Use Value: Provides deterministic, bounce-free signal timing critical for servo control and data read/write synchronization. |
| Home Appliance Speed Monitoring | Home Safety Interlock |
Use Scenario: Measuring drum rotation in washing machines via embedded magnet on shaft. IC Role / Device Role / Timing Role: Pulse generator delivering frequency-proportional tachometer signal to MCU. Use Value: Enables closed-loop spin control and imbalance detection using low-cost, non-contact sensing. |
Use Scenario: Verifying child-lock engagement or oven door seal integrity before heating cycle. IC Role / Device Role / Timing Role: Safety-critical presence detector enabling/disabling power paths. Use Value: Supports IEC 60335-1 compliance with zero-contact reliability and immunity to dust/moisture ingress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unipolar Hall-effect switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL33733-S01T | Higher Bop (160–200 G), same SC59 package, 30 mA sink - tighter magnetic tolerance but less sensitive at long air gaps | Preferred where strong magnets or high EMI environments require increased noise margin | Select when higher operate point improves robustness against stray fields or mechanical misalignment |
| US1881N | Lower supply range (3–24 V), 20 mA sink, SIP-3 only - lacks SC59 option and automotive temp rating | Limited to consumer-grade appliances without extended temperature or space constraints | Choose only if SIP-3 footprint is acceptable and operating ambient stays below +85°C |
Compared with AL33733-S01T and US1881N, the AH337-WL-7 offers optimal balance of sensitivity (120 G Bop), wide voltage range (4.2–28 V), and compact SC59 packaging - making it uniquely suited for space-constrained, wide-supply industrial and automotive-adjacent applications requiring consistent magnetic response across full temperature range.
Availability
AH337-WL-7 is available at Aetrix Electronics and suitable for cover detection, optical drive positioning, and home appliance safety interlocks requiring stable component supply despite its obsolete status - inventory is secured through legacy channel sourcing with full traceability.
Supply support for AH337-WL-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, manufacturing, and distribution operations across Asia, Europe, and the Americas.
The AH337 belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust, low-power, contactless switching in cost-sensitive industrial, appliance, and automotive-qualified systems - emphasizing magnetic stability, wide supply tolerance, and environmental compliance.
FAQ
Is AH337-WL-7 still in production?
No - AH337-WL-7 is officially obsolete per Diodes' DS31050 Rev. 13–4 (August 2022). However, Aetrix Electronics maintains limited legacy stock with full traceability and provides documented lot history, ensuring continuity for existing designs undergoing end-of-life transition planning.
What is the correct pull-up resistor value for AH337-WL-7 OUT pin?
A 4.7 kΩ resistor to Vdd is recommended for most applications, balancing rise time (<1 µs) and power consumption (~2.5 mA static draw). For faster switching with 12 V supply, 1 kΩ yields ~12 mA sink current and sub-200 ns rise time - verified in Diodes' typical application circuit on page 2 of DS31050.
Can AH337-WL-7 replace AH337-PG-A in SIP-3 format?
No - AH337-WL-7 uses SC59 (SOT23) packaging, while AH337-PG-A uses SIP-3. Footprint, thermal dissipation (230 mW vs. 550 mW), and lead configuration differ significantly. Direct replacement requires PCB redesign and thermal revalidation per respective package derating curves on pages 4–5 of DS31050.
Does AH337-WL-7 meet AEC-Q100 requirements?
No - AH337-WL-7 is not AEC-Q100 qualified. Diodes explicitly states that automotive-qualified variants require separate part numbers (e.g., AH337Q series) and PPAP-capable manufacturing in IATF 16949 facilities. This part is intended for industrial and consumer applications per its datasheet scope.
AH337-WL-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Cut Tape (CT)
- Product Status:
- Obsolete
- Function:
- -
- Technology:
- -
- Polarization:
- -
- Sensing Range:
- -
- Test Condition:
- -
- Voltage - Supply:
- -
- Current - Supply (Max):
- -
- Current - Output (Max):
- -
- Output Type:
- -
- Features:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-59-3
AH337-WL-7 FAQ
1.How can I place an order for AH337-WL-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH337-WL-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 AH337-WL-7 reliable?
The price and inventory of AH337-WL-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH337-WL-7 is usually 5 days.
3.What payment methods are accepted for AH337-WL-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH337-WL-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH337-WL-7?
AH337-WL-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH337-WL-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 AH337-WL-7?
For technical support, including AH337-WL-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH337-WL-7 requirements.
6.How does Aetrix verify that AH337-WL-7 is sourced from the original manufacturer or authorized distributors?
All AH337-WL-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 AH337-WL-7 meets industry standards.
7.What is the process for return or replacement of AH337-WL-7?
All AH337-WL-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH337-WL-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 AH337-WL-7 part is unused and in its original packaging.
Return procedure for AH337-WL-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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