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Diodes Incorporated AH337-PG-A
- Part No.:
- AH337-PG-A
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP, Formed Leads
- Datasheet:
-
AH337-PG-A.pdf
- Description:
- MAGNETIC SWITCH UNIPOLAR 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,161
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Product details
Overview
AH337-PG-A 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, delivers 25mA sink current, features magnetic operate/release points of 120G/60G typical, and uses an open-collector output with 300mV saturation voltage at 10mA - deployed in DVD loader cover detection and home appliance safety interlocks.
For engineers reviewing the AH337-PG-A datasheet, AH337-PG-A pinout, AH337-PG-A application, or AH337-PG-A equivalent, this page provides verified technical context, package mapping (SIP-3 Ammo Pack), magnetic switching thresholds, temperature-compensated operation across –40°C to +125°C, and real-world use cases in mechanical actuation and safety-critical presence detection.
Technical Context
The AH337-PG-A integrates a Hall voltage generator, chopper-stabilized amplifier, Schmitt trigger with 60G hysteresis, and open-drain pre-driver stage - enabling robust noise immunity and stable switching under varying magnetic field gradients. Its band-gap regulator supports wide-supply operation while maintaining consistent Bop/Brp performance from 4.5V to 28V.
Magnetic response is calibrated for south-pole activation on the branded side, with Bop = 120G typ and Brp = 60G typ at +25°C. Temperature compensation ensures Bop drift remains within ±10% over –40°C to +125°C ambient, critical for automotive-grade mechanical sensing without external calibration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.2V to 28V DC - enables direct integration into 5V, 12V, and 24V industrial control rails without external regulation |
| Output Type | Open-collector - allows wired-OR logic, level-shifting, and direct interface with microcontroller GPIO or relay drivers |
| Max Sink Current | 25mA - sufficient to drive LEDs, small solenoids, or optocouplers without external buffer transistors |
| Bop / Brp | 120G / 60G typical - defines reliable actuation and release margins for mechanical gap tolerances up to ±0.5mm |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive, HVAC blower assemblies, and industrial motor enclosures |
| Hysteresis | 60G - prevents chatter during slow or oscillating magnetic transitions in rotating or sliding mechanisms |
| VDS(SAT) | 300mV @ 10mA - minimizes power loss and self-heating during continuous ON-state operation |
Pinout & Package
Package: SIP-3 (Ammo Pack) - 3-pin single-inline package with spread leads, 4.1mm body width, 14.0–15.0mm lead length, optimized for through-hole mounting in high-vibration environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vdd | Power input | Positive supply terminal - accepts 4.2–28V; internal band-gap regulator powers analog core independently of rail noise |
| GND | Reference ground | Analog and digital return path - must be low-impedance to maintain Schmitt trigger stability under EMI |
| OUT | Open-collector output | Sinks current when active - requires external pull-up; compatible with 3.3V/5V/12V logic families |
Key Features
| Feature | Design Value |
|---|---|
| Unipolar magnetic sensing | Responds only to south-pole field on branded side - eliminates false triggers from stray north-pole fields or nearby magnets |
| Temperature compensation | Maintains ±10% Bop variation over –40°C to +125°C - removes need for system-level thermal recalibration |
| Wide supply range | Operates down to 4.2V - supports brown-out resilience in battery-backed or unregulated 5V systems |
| Lead-free & green construction | Meets RoHS 3 (2015/863/EU), <900ppm Br+Cl, <1000ppm Sb - compliant for EU, China, and Japan environmental mandates |
Applications
| Cover Detection in Optical Drives | Home Appliance Door Interlock |
|---|---|
|
Use Scenario: Detecting closure of DVD/CD tray or optical drive cover to enable spindle motor and laser activation. IC Role / Device Role / Timing Role: Unipolar Hall switch providing TTL-compatible enable signal upon mechanical latch engagement. Use Value: Eliminates mechanical microswitch wear; 60G hysteresis prevents bounce during slow tray insertion. |
Use Scenario: Confirming washing machine or dishwasher door is fully latched before initiating water fill or spin cycle. IC Role / Device Role / Timing Role: Safety-critical presence detector interfacing directly with MCU GPIO via open-collector output. Use Value: –40°C to +125°C rating ensures reliability in steam-rich, high-humidity cabinet environments. |
| Speed Measurement in Small Motors | Home Safety Occupancy Sensing |
|
Use Scenario: Monitoring rotation of small DC fan or blower motors using a magnet on the shaft and fixed AH337-PG-A. IC Role / Device Role / Timing Role: Edge-triggered pulse generator for RPM calculation via microcontroller timer capture. Use Value: 25mA sink capability drives optocoupler inputs directly, isolating motor noise from control logic. |
Use Scenario: Detecting user presence near stove controls or oven door to activate child lock or disable touch interface. IC Role / Device Role / Timing Role: Proximity sensor mounted behind panel, activated by magnet embedded in user-accessible trim. Use Value: 4.2V minimum operating voltage enables direct connection to 5V USB-powered safety modules. |
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 Bop (25G typ), 3.3V–26V supply, SOT-23 package | Better suited for low-field, PCB-space-constrained designs; lacks SIP-3 mechanical robustness | Select for surface-mount volume production where board area is limited and magnetic gaps are sub-0.3mm |
| Melexis US1881EUA-ABA-000-REEL | Higher Bop (200G typ), 3.5V–24V, SC-59 package, integrated reverse-polarity protection | More tolerant of air-gap variation but less immune to stray fields due to wider hysteresis (100G) | Prefer for battery-powered devices requiring polarity reversal tolerance and tighter magnetic threshold control |
Compared with A3212LLHLT-T and US1881EUA-ABA-000-REEL, AH337-PG-A offers superior mechanical mounting stability via SIP-3 leads, higher sink current for direct load driving, and optimized hysteresis for mid-gap mechanical actuation - making it ideal for legacy through-hole industrial assemblies.
Availability
AH337-PG-A is available at Aetrix Electronics and suitable for optical drive loaders, home appliance interlocks, motor speed feedback, and safety-critical occupancy detection requiring stable component supply and long-term obsolescence management.
Supply support for AH337-PG-A 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 ICs, with manufacturing certified to IATF 16949 and product qualification per AEC-Q100/101 standards.
AH337-PG-A belongs to Diodes' Hall-effect sensor product line, engineered for cost-sensitive, high-reliability contactless switching in automotive subsystems, white goods, and industrial motion control.
FAQ
Is AH337-PG-A still in production?
No - AH337-PG-A is officially obsolete per Diodes' DS31050 Rev. 13 (August 2022). Diodes recommends AH3377 as the designated replacement. However, Aetrix Electronics maintains legacy inventory with full traceability and supports design continuity for existing production programs through controlled allocation.
What is the difference between AH337-PG-A and AH337-WG-7?
AH337-PG-A uses SIP-3 (Ammo Pack) packaging with spread leads for through-hole mounting, while AH337-WG-7 uses SC59 (SOT-23) packaging for surface-mount assembly. Both share identical electrical and magnetic specifications, but differ in thermal dissipation (550mW vs. 230mW) and PCB footprint requirements.
Can AH337-PG-A operate from a 3.3V supply?
No - the absolute minimum supply voltage is 4.2V, and magnetic characteristics are not guaranteed until VDD ≥ 4.5V. Attempting operation below 4.2V risks undefined output behavior and failure to switch; it is incompatible with standard 3.3V logic rails without a boost converter or LDO.
Does AH337-PG-A require an external pull-up resistor on the OUT pin?
Yes - the open-collector output requires an external pull-up resistor to VDD or another logic rail. Typical values range from 1kΩ to 10kΩ depending on rise time and bus capacitance; 4.7kΩ is recommended for 12V systems with ≤50pF trace capacitance to ensure <1µs rise time.
AH337-PG-A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-SIP, Formed Leads
- Packaging:
- Cut Tape (CT)
- 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:
- Through Hole
- Supplier Device Package:
- 3-SIP
AH337-PG-A FAQ
1.How can I place an order for AH337-PG-A through Aetrix?
Please submit a Request for Quotation (RFQ) for AH337-PG-A 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-PG-A reliable?
The price and inventory of AH337-PG-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH337-PG-A is usually 5 days.
3.What payment methods are accepted for AH337-PG-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH337-PG-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH337-PG-A?
AH337-PG-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH337-PG-A 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-PG-A?
For technical support, including AH337-PG-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH337-PG-A requirements.
6.How does Aetrix verify that AH337-PG-A is sourced from the original manufacturer or authorized distributors?
All AH337-PG-A 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-PG-A meets industry standards.
7.What is the process for return or replacement of AH337-PG-A?
All AH337-PG-A units undergo pre-shipment inspection (PSI). If there is an issue with AH337-PG-A, 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-PG-A part is unused and in its original packaging.
Return procedure for AH337-PG-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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