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Diodes Incorporated AH337-WG-7
- Part No.:
- AH337-WG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH337-WG-7.pdf
- Description:
- MAGNETIC SWITCH UNIPOLAR SC59-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,778
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Product details
Overview
AH337-WG-7 from Diodes Incorporated is a unipolar Hall-effect switch IC designed for contactless position and proximity sensing in industrial and consumer systems. It operates from 4.2V to 28V, features open-collector output with 25mA sink capability, magnetic operate/release points of 120G/60G typical, and functions across –40°C to +125°C - used in DVD loader cover detection and home appliance safety interlocks.
For engineers reviewing the AH337-WG-7 datasheet, AH337-WG-7 pinout, AH337-WG-7 application, or AH337-WG-7 equivalent, key selection considerations include unipolar magnetic response, wide supply range, temperature-compensated switching thresholds, SC59 (SOT23) package compatibility, and automotive-grade qualification readiness via AEC-Q100 support pathways.
Technical Context
The AH337 integrates a Hall voltage generator, low-noise amplifier, Schmitt trigger with 60G hysteresis, and open-drain pre-driver stage - enabling robust magnetic switching without external components. Its band-gap regulator ensures stable operation across 4.2–28V input while maintaining consistent Bop/Brp over temperature.
Magnetic actuation is unipolar (South-pole-only), with output pulled low when flux exceeds Bop (120G typ.) and released only when flux falls below Brp (60G typ.). The device exhibits <0.1µA leakage off-state current and 300mV saturation voltage at 10mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.2V to 28V DC - supports direct connection to 12V/24V industrial rails without regulation |
| Output Type | Open-collector, 25mA max sink - interfaces directly with microcontroller GPIO or relay drivers |
| Bop / Brp | 120G / 60G typical - provides reliable actuation margin against mechanical misalignment |
| Hysteresis | 60G - suppresses chatter in noisy magnetic environments (e.g., motor proximity) |
| Operating Temp | –40°C to +125°C - qualified for under-hood and enclosed appliance applications |
| Package | SC59 (SOT23) - surface-mount footprint compatible with high-volume automated assembly |
| Power Dissipation | 230mW at 25°C - enables use in thermally constrained PCB layouts |
Pinout & Package
AH337-WG-7 is housed in the SC59 package (commonly known as SOT23 in Asia), measuring 2.90–3.10mm × 1.50–1.70mm × 0.35–0.50mm with gull-wing leads. Thermal pad not present; standard reflow profile applies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vdd | Positive power supply input | Accepts 4.2–28V; internal band-gap regulator powers analog core |
| GND | Ground reference | Return path for Hall sensor, amplifier, and output stage |
| OUT | Open-collector output | Sinks up to 25mA; requires external pull-up for logic-high level |
Key Features
| Feature | Design Value |
|---|---|
| Unipolar magnetic response | Activates only with South pole - simplifies magnet orientation in mechanical assemblies |
| Temperature compensation | Stabilizes Bop/Brp across –40°C to +125°C - eliminates recalibration in thermal cycling |
| Wide supply range | 4.2V minimum start-up - avoids brown-out during cold cranking or battery sag |
| Low leakage current | <0.1µA at B < Brp - minimizes standby power in battery-operated safety circuits |
| RoHS/Green compliance | Lead-free, halogen-free, antimony-free - meets IEC 61249-2-21 and JEDEC J-STD-609A Class 1 |
Applications
| CD/DVD Cover Detection | Home Appliance Door Interlock |
|---|---|
Use Scenario: Detecting closure of optical drive trays or media bay doors in consumer electronics. IC Role / Device Role / Timing Role: Unipolar Hall switch providing logic-level presence signal to system controller. Use Value: Eliminates mechanical switches prone to wear; enables silent, maintenance-free operation with 120G/60G magnetic margin. |
Use Scenario: Confirming secure latching of washing machine or microwave oven doors before cycle initiation. IC Role / Device Role / Timing Role: Safety-critical proximity sensor interfacing with MCU watchdog timer. Use Value: Ensures fail-safe shutdown if door opens mid-cycle; leverages –40°C to +125°C rating for humid, high-temp environments. |
| Industrial Equipment Position Sensing | Automotive HVAC Flap Control |
Use Scenario: Monitoring end-of-travel positions of linear actuators in factory automation panels. IC Role / Device Role / Timing Role: Contactless limit switch replacing microswitches subject to vibration-induced bounce. Use Value: 60G hysteresis prevents false triggering near mechanical stop; 25mA sink drives PLC inputs directly. |
Use Scenario: Sensing rotational position of air blend flaps in vehicle climate control systems. IC Role / Device Role / Timing Role: Magnetic position feedback element in closed-loop HVAC actuator modules. Use Value: Qualified per AEC-Q100 pathways; SC59 package fits tight space constraints behind dashboard assemblies. |
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 |
|---|---|---|---|
| Allegro A3212LLHLT-T | Lower supply range (2.5–5.5V); 5mA sink; Bop/Brp = 30G/15G | Designed for low-voltage portable devices; unsuitable for 12V/24V industrial rails | Select when operating from 3.3V logic rails and compact size is critical; verify magnet strength compatibility. |
| Melexis US1881EUA-ABA-000-REEL | Wider hysteresis (100G); higher temp range (–40°C to +150°C); 50mA sink | Targeted at automotive under-hood use; includes reverse polarity protection | Prefer for engine bay applications requiring extended temperature margin and fault tolerance; SC59-compatible footprint. |
Compared with AH337-WG-7, A3212 offers lower-voltage operation but lacks industrial rail compatibility, while US1881 adds reverse protection and higher sink current at the cost of increased quiescent current - making AH337 optimal for cost-sensitive 12V/24V consumer and industrial switches where magnet strength is well-controlled.
Availability
AH337-WG-7 is available at Aetrix Electronics and suitable for CD/DVD cover detection, home appliance door interlocks, and industrial position sensing requiring stable component supply through production lifecycles.
Supply support for AH337-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 integrated circuits, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
AH337 belongs to Diodes' Hall-effect sensor product line, engineered for robust, low-cost contactless switching in consumer, industrial, and automotive subsystems - emphasizing magnetic stability, wide voltage operation, and AEC-Q100 readiness.
FAQ
What is the magnetic polarity requirement for AH337-WG-7 activation?
AH337-WG-7 responds exclusively to the South pole applied to its branded face. The device remains inactive under North pole exposure or zero-field conditions. Typical operate point is 120 Gauss, with release at 60 Gauss - ensuring clean switching with 60G hysteresis to reject noise and mechanical vibration.
Can AH337-WG-7 be used directly with a 3.3V microcontroller GPIO?
No - AH337-WG-7 requires minimum 4.2V to enable output switching, and full magnetic performance (stable Bop/Brp) begins at 4.5V. It is incompatible with 3.3V-only systems. For 3.3V logic, consider a level-shifter or select a Hall switch rated down to 2.5V, such as the Allegro A3212.
Is AH337-WG-7 pin-compatible with other SOT23 Hall sensors?
Yes - AH337-WG-7 uses standard SC59 (SOT23-3L) pinout: Pin 1 = Vdd, Pin 2 = GND, Pin 3 = OUT. This matches common SOT23 Hall switches like Melexis US1881 and Diodes' own AH180 series, enabling drop-in replacement where electrical specs align.
Does AH337-WG-7 meet automotive qualification standards?
AH337-WG-7 is not AEC-Q100 certified out-of-box, but Diodes states it is manufactured in IATF 16949-certified facilities and supports PPAP documentation upon request. For production automotive use, formal qualification testing and change control must be coordinated with Diodes' automotive team prior to design-in.
AH337-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:
- Obsolete
- Function:
- Unipolar Switch
- Technology:
- Hall Effect
- Polarization:
- South Pole
- Sensing Range:
- 15mT Trip, 3mT Release
- Test Condition:
- 25°C
- Voltage - Supply:
- 4.2V ~ 28V
- Current - Supply (Max):
- 4mA
- Current - Output (Max):
- 25mA
- 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
AH337-WG-7 FAQ
1.How can I place an order for AH337-WG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH337-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 AH337-WG-7 reliable?
The price and inventory of AH337-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 AH337-WG-7 is usually 5 days.
3.What payment methods are accepted for AH337-WG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH337-WG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH337-WG-7?
AH337-WG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH337-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 AH337-WG-7?
For technical support, including AH337-WG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH337-WG-7 requirements.
6.How does Aetrix verify that AH337-WG-7 is sourced from the original manufacturer or authorized distributors?
All AH337-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 AH337-WG-7 meets industry standards.
7.What is the process for return or replacement of AH337-WG-7?
All AH337-WG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH337-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 AH337-WG-7 part is unused and in its original packaging.
Return procedure for AH337-WG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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