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Diodes Incorporated AH337-PL-A
- Part No.:
- AH337-PL-A
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP, Formed Leads
- Datasheet:
-
AH337-PL-A.pdf
- Description:
- MAGNETIC SWITCH UNIPOLAR 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,051
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Product details
Overview
AH337 from Diodes Incorporated is a unipolar Hall-effect switch IC designed for contactless position and proximity sensing in industrial and consumer systems. It integrates a Hall voltage generator, amplifier, Schmitt trigger with 60 Gauss hysteresis, and open-collector output capable of sinking 25 mA. Operates from 4.2 V to 28 V DC across –40°C to +125°C, used in DVD loader cover detection and home appliance safety interlocks.
For engineers reviewing the AH337 datasheet, AH337 pinout, AH337 application, or AH337 equivalent, key selection criteria include magnetic operate/release points (Bop = 120 Gauss typ, Brp = 60 Gauss typ), wide supply range, temperature-compensated switching behavior, and SIP-3/SC59 package compatibility with legacy board layouts.
Technical Context
The AH337 implements a single-pole magnetic sensing architecture where output turns ON only when a sufficient south-pole field exceeds Bop (120 Gauss typ) and remains latched until field drops below Brp (60 Gauss typ), delivering noise-immune digital switching via built-in hysteresis. Its band-gap regulator enables stable operation across 4.2–28 V without external biasing.
Functional block integration includes on-die Hall element, low-noise amplifier, precision Schmitt trigger, and open-drain N-channel MOSFET output stage. The device requires no external components for basic operation and supports direct interface with microcontroller GPIOs or relay drivers via its 25 mA sink capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.2 V to 28 V DC - Enables direct use with 5 V, 12 V, and 24 V industrial rails without regulation. |
| Output Type | Open-collector N-channel - Allows wired-OR logic, level-shifting, and direct drive of LEDs, relays, or MCU inputs. |
| Max Output Sink Current | 25 mA - Sufficient to drive small solenoids, indicator LEDs, or optocouplers without external transistor. |
| Operate Point (Bop) | 90–150 Gauss - Defines minimum magnetic field strength required to activate output at room temperature. |
| Release Point (Brp) | 30–90 Gauss - Sets magnetic field threshold below which output releases, ensuring clean turn-off with 60 Gauss hysteresis. |
| Operating Temperature | –40°C to +125°C - Qualified for under-hood automotive and industrial environments without derating. |
| Power Dissipation (SC59) | 230 mW @ 25°C - Limits continuous output current to ~15 mA at elevated ambient temperatures per thermal derating curve. |
Pinout & Package
Available in SIP-3 (straight or spread lead) and SC59 (SOT-23 equivalent) packages. SIP-3 uses 3-pin inline configuration; SC59 uses standard SOT-23 footprint with same pin assignment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vdd | Positive power supply input | Accepts 4.2–28 V DC; powers internal regulator, Hall element, and output stage. |
| GND | Ground reference | Return path for supply current and output sink current; must be low-impedance for stable hysteresis. |
| OUT | Open-collector output | Sinks up to 25 mA when active; requires external pull-up resistor to define logic HIGH level. |
Key Features
| Feature | Design Value |
|---|---|
| Unipolar magnetic response | Detects only south-pole fields - simplifies mechanical design by eliminating polarity alignment requirements in cover detectors. |
| Integrated Schmitt trigger | 60 Gauss hysteresis - prevents chatter during slow or noisy magnetic transitions near Bop/Brp thresholds. |
| Temperature compensation | Stable Bop/Brp over –40°C to +125°C - eliminates need for system-level calibration in varying thermal environments. |
| Wide supply range | 4.2–28 V operation - supports direct connection to battery, SMPS, or unregulated industrial rails without LDO. |
Applications
| CD/DVD Cover Detection | Home Appliance Safety Interlock |
|---|---|
Use Scenario: Detect lid closure in optical disc drives to enable spindle motor and laser activation only when fully closed. IC Role / Device Role / Timing Role: Digital presence sensor providing TTL-compatible enable signal to main controller. Use Value: Eliminates mechanical switches prone to wear; leverages consistent 120 Gauss Bop for reliable actuation with small neodymium magnets. |
Use Scenario: Confirm oven door or washing machine lid is fully sealed before initiating heating or spin cycles. IC Role / Device Role / Timing Role: Fail-safe proximity detector interfacing directly with MCU GPIO or safety PLC input. Use Value: Meets IEC 60335-1 requirements via robust hysteresis and –40°C to +125°C operation across ambient conditions. |
| Rotational Speed Sensing | Industrial Equipment Position Feedback |
Use Scenario: Count gear teeth or fan blades using embedded magnet on rotating shaft for RPM monitoring. IC Role / Device Role / Timing Role: Edge-triggered pulse generator synchronized to magnetic field transitions. Use Value: 25 mA sink current drives optocoupler inputs directly; 60 Gauss hysteresis rejects vibration-induced false triggers. |
Use Scenario: Verify end-of-travel position of linear actuators or sliding panels in factory automation. IC Role / Device Role / Timing Role: Solid-state limit switch replacing electromechanical units in dusty or high-cycle environments. Use Value: SIP-3 package fits legacy PCB footprints; 28 V max rating supports 24 V control systems without additional protection. |
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 (25–50 Gauss), 3.5–24 V supply, SOT-23 package only | Better suited for low-field, battery-powered devices; not rated for >125°C operation | Select when magnetic gap is large or field strength weak; avoid in high-temp industrial use. |
| Melexis US1881EUA-ABA-000-SP | Higher Bop (150–200 Gauss), 3–24 V supply, integrated reverse-polarity protection | Requires stronger magnet but offers enhanced ESD and supply fault tolerance | Prefer for automotive-grade designs needing reverse-battery immunity and tighter magnetic tolerance. |
Compared with A3212LLHLT-T and US1881EUA-ABA-000-SP, AH337 delivers broader voltage range (4.2–28 V), higher temperature rating (+125°C), and dual-package availability (SIP-3 + SC59), making it optimal for legacy industrial upgrades and high-voltage control systems where field strength and thermal margin are predictable.
Availability
AH337 is available at Aetrix Electronics and suitable for CD/DVD loaders, home appliance safety interlocks, and industrial position feedback systems requiring stable component supply despite its obsolete status-inventory is secured for long-term support of existing designs.
Supply support for AH337 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.
AH337 belongs to Diodes' Hall-effect sensor product line, engineered specifically for cost-sensitive, high-reliability contactless switching in consumer, industrial, and automotive-adjacent applications where robustness and wide operating range are critical.
FAQ
Is AH337 still in production?
No-AH337 is officially discontinued and marked obsolete by Diodes Incorporated as of August 2022. However, Aetrix Electronics maintains secured legacy inventory and offers full traceability, extended warranty, and technical documentation support for ongoing production of qualified designs.
What is the difference between SIP-3 and SC59 packages for AH337?
SIP-3 (Single In-line Package) has three vertically aligned leads in straight or spread configuration, commonly used in through-hole PCBs; SC59 is Diodes' designation for the industry-standard SOT-23 surface-mount package. Both share identical pinout (Vdd-GND-OUT) and electrical specs, but differ in mounting method and thermal performance-SC59 dissipates 230 mW vs. 550 mW for SIP-3.
Can AH337 replace AH3377?
No-AH3377 is a direct replacement part released by Diodes to supersede AH337, featuring improved sensitivity, tighter Bop/Brp tolerances, and updated qualification. AH3377 is not pin-compatible due to different package options and revised internal circuitry; migration requires layout and firmware validation.
Does AH337 require an external pull-up resistor on the OUT pin?
Yes-AH337 has an open-collector output and requires an external pull-up resistor to Vdd or another logic rail. Typical values range from 1 kΩ to 10 kΩ depending on rise time and load capacitance; 4.7 kΩ is recommended for 12 V systems driving standard CMOS inputs.
AH337-PL-A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-SIP, Formed Leads
- Packaging:
- Tape & Box (TB)
- 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-A FAQ
1.How can I place an order for AH337-PL-A through Aetrix?
Please submit a Request for Quotation (RFQ) for AH337-PL-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-PL-A reliable?
The price and inventory of AH337-PL-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-PL-A is usually 5 days.
3.What payment methods are accepted for AH337-PL-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH337-PL-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH337-PL-A?
AH337-PL-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH337-PL-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-PL-A?
For technical support, including AH337-PL-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH337-PL-A requirements.
6.How does Aetrix verify that AH337-PL-A is sourced from the original manufacturer or authorized distributors?
All AH337-PL-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-PL-A meets industry standards.
7.What is the process for return or replacement of AH337-PL-A?
All AH337-PL-A units undergo pre-shipment inspection (PSI). If there is an issue with AH337-PL-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-PL-A part is unused and in its original packaging.
Return procedure for AH337-PL-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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