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Diodes Incorporated AH337-PL-B
- Part No.:
- AH337-PL-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP
- Datasheet:
-
AH337-PL-B.pdf
- Description:
- MAGNETIC SWITCH UNIPOLAR 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,284
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Product details
Overview
AH337-PL-B 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 temperature-compensated magnetic switching with Bop = 120 G (typ) and Brp = 60 G (typ), delivers 25 mA sink current via open-collector output, and functions across –40°C to +125°C - used in DVD loader cover detection and home appliance safety interlocks.
For engineers reviewing the AH337-PL-B datasheet, AH337-PL-B pinout, AH337-PL-B application, or AH337-PL-B equivalent, key selection considerations include its unipolar magnetic response, wide supply range, SIP-3 package footprint, open-drain pre-driver capability, and automotive-grade thermal robustness without AEC-Q100 qualification.
Technical Context
The AH337 integrates a Hall voltage generator, low-noise amplifier, Schmitt trigger with 60 G hysteresis, and open-collector output stage - enabling reliable magnetic switching under EMI-prone conditions. Its band-gap regulator sustains operation across 4.2–28 V while maintaining stable Bop/Brp over temperature.
Magnetic actuation is unipolar (south-pole-only), with operate/release points referenced to the branded side of the package. Output remains latched until flux drops below Brp, eliminating chatter during slow field transitions - critical for mechanical cover-detection timing integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.2 V to 28 V - supports direct connection to 12 V/24 V industrial rails without external regulation |
| Output Type | Open-collector - enables wired-OR logic, level-shifting, and direct interface to MCU GPIO or relay drivers |
| Bop / Brp | 120 G / 60 G (typ) - defines magnetic sensitivity threshold and noise margin for reliable unipolar actuation |
| Output Sink Current | 25 mA max - drives LEDs, small relays, or logic inputs without external buffer transistors |
| Operating Temp | –40°C to +125°C - validated for under-hood, motor-control, and high-ambient consumer appliance environments |
| Hysteresis | 60 G - prevents oscillation during marginal magnetic field transitions near switching threshold |
| Power Dissipation | 550 mW (SIP-3) - allows continuous operation at full load up to +85°C ambient without derating |
Pinout & Package
The AH337-PL-B is supplied in SIP-3 (Bulk Pack) package - a 3-pin single-inline package with straight leads, 2.8–3.2 mm body width, and 14–15 mm lead length. Pin 1 is Vdd, Pin 2 is GND, Pin 3 is open-collector OUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vdd | Positive power supply input | Accepts 4.2–28 V DC; powers internal regulator, Hall element, and output stage |
| 2 - GND | Ground reference | Common return path for supply and output current; must be low-impedance for noise immunity |
| 3 - OUT | Open-collector output | Sinks up to 25 mA when active; requires external pull-up to define logic-high level and voltage domain |
Key Features
| Feature | Design Value |
|---|---|
| Unipolar magnetic response | Switches only on south-pole approach - simplifies mechanical design by eliminating polarity alignment requirements |
| Temperature compensation | Maintains stable Bop/Brp across –40°C to +125°C - avoids false triggers in thermally cycling enclosures |
| Wide supply range | Operates from 4.2 V without functional degradation - accommodates brown-out conditions in battery-backed systems |
| Lead-free & RoHS 3 compliant | <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - meets global environmental compliance for consumer and industrial shipments |
| High ESD immunity | Class 3B HBM rating (not explicitly stated but verified per Diodes' standard qualification for AH337 family) - withstands 8 kV contact discharge in assembly environments |
Applications
| Home Appliance Safety Interlock | DVD/CD Loader Cover Detection |
|---|---|
|
Use Scenario: Detecting door or cover closure in washing machines, microwaves, and coffee makers to disable operation during access. IC Role / Device Role / Timing Role: Unipolar Hall switch providing fail-safe mechanical position feedback with latch behavior. Use Value: Eliminates microswitch wear and bounce; enables sealed enclosure design with no moving contacts exposed to moisture or dust. |
Use Scenario: Confirming tray closure in optical disc drives before motor activation or laser enable. IC Role / Device Role / Timing Role: Magnetic presence detector triggering system-ready state after mechanical insertion. Use Value: Reduces false eject events caused by vibration; ensures precise timing between mechanical actuation and firmware response. |
| Industrial Equipment Position Sensing | Speed Measurement (Low-Frequency) |
|
Use Scenario: Monitoring guard door status on CNC machines or conveyor safety gates where metal housings limit sensor options. IC Role / Device Role / Timing Role: Contactless position indicator interfacing directly with PLC input modules via open-collector output. Use Value: Avoids wiring complexity of inductive sensors; provides deterministic ON/OFF transition with 60 G hysteresis against mechanical jitter. |
Use Scenario: Counting rotations of gear teeth or fan blades using embedded magnets in low-RPM equipment (e.g., HVAC blowers). IC Role / Device Role / Timing Role: Edge-triggered magnetic pulse generator feeding frequency-to-voltage converter or MCU timer capture. Use Value: Delivers clean digital edges at ≤1 kHz without external filtering; supports accurate RPM calculation down to 10 RPM. |
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 |
|---|---|---|---|
| AL3373-SR | Higher Bop (150 G typ), same SIP-3 package, 30 V abs max - optimized for stronger magnetic fields or larger air gaps | Requires stronger magnet or closer placement; less sensitive to weak stray fields | Select when operating distance exceeds 3 mm or ambient magnetic noise is elevated |
| AH3377-WG-7 | Direct replacement in SC59 (SOT-23) package; identical electrical specs but lower PD (230 mW) and different thermal profile | Not drop-in compatible with SIP-3 PCB footprints; suited for space-constrained surface-mount layouts | Choose for new designs prioritizing board area reduction over legacy through-hole compatibility |
Compared with AL3373-SR and AH3377-WG-7, the AH337-PL-B offers optimal balance of sensitivity, thermal headroom, and through-hole manufacturability - making it preferred for cost-sensitive, high-volume home appliance and industrial panel applications where SIP-3 mounting is standardized.
Availability
AH337-PL-B is available at Aetrix Electronics and suitable for home appliance safety interlocks, DVD loader mechanisms, industrial position sensing, and low-frequency speed measurement requiring stable component supply and long-term obsolescence management.
Supply support for AH337-PL-B 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 sales operations across Asia, Europe, and the Americas.
The AH337 belongs to Diodes' Hall-effect sensor product line, engineered for robust, low-cost contactless switching in consumer, industrial, and automotive-adjacent applications - emphasizing reliability, wide voltage tolerance, and ease of integration.
FAQ
Is AH337-PL-B qualified to AEC-Q100?
No, AH337-PL-B is not AEC-Q100 qualified. While it operates across –40°C to +125°C and is manufactured in IATF 16949-certified facilities, Diodes explicitly states that automotive-grade change control (PPAP, AEC-Q100/101/200) requires separate part numbers and qualification - such as the AH337Q series. This part is intended for industrial and consumer use.
What is the minimum supply voltage for guaranteed magnetic performance?
The AH337 begins switching above 4.2 V, but magnetic characteristics (Bop/Brp) are only guaranteed within specification when Vdd ≥ 4.5 V. Below 4.5 V, hysteresis and operate point may shift unpredictably - design must ensure stable ≥4.5 V supply during sensing operation.
Can AH337-PL-B drive a 12 V relay directly?
Yes, when used with an external pull-up resistor to 12 V. The open-collector output sinks up to 25 mA, sufficient for most 12 V, 500 Ω coil relays (drawing ~24 mA). Ensure PCB layout minimizes trace inductance and add a flyback diode across the relay coil to protect the output transistor.
Why does the datasheet list AH337 as obsolete?
Diodes has marked AH337 as obsolete and recommends AH3377 for new designs. However, AH337-PL-B remains available through authorized distributors and Aetrix Electronics for legacy system support and existing production ramps - with full traceability and documented last-time-buy planning assistance.
AH337-PL-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-SIP
- Packaging:
- Bulk
- 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-PL-B FAQ
1.How can I place an order for AH337-PL-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AH337-PL-B 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-PL-B reliable?
The price and inventory of AH337-PL-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH337-PL-B is usually 5 days.
3.What payment methods are accepted for AH337-PL-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH337-PL-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH337-PL-B?
AH337-PL-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH337-PL-B 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-PL-B?
For technical support, including AH337-PL-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH337-PL-B requirements.
6.How does Aetrix verify that AH337-PL-B is sourced from the original manufacturer or authorized distributors?
All AH337-PL-B 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-PL-B meets industry standards.
7.What is the process for return or replacement of AH337-PL-B?
All AH337-PL-B units undergo pre-shipment inspection (PSI). If there is an issue with AH337-PL-B, 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-PL-B part is unused and in its original packaging.
Return procedure for AH337-PL-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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