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Home > Products > Sensors, Transducers > Magnetic Sensors > Switches (Solid State)

Diodes Incorporated AH337-PG-B

Name: AH337-PG-B
Brand: Diodes Incorporated
SKU: AH337-PG-B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AH337-PG-B

Manufacturer:: Diodes Incorporated

Category:: Switches (Solid State)

Package:: 3-SIP

Datasheet:: AH337-PG-B.pdf

Description:: MAGNETIC SWITCH UNIPOLAR 3SIP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AH337-PG-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 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 cover detection, DVD loader actuation, and home appliance safety interlocks.

For engineers reviewing the AH337-PG-B datasheet, AH337-PG-B pinout, AH337-PG-B application, or AH337-PG-B equivalent, this page delivers verified technical context, package-specific pin mapping (SIP-3 Bulk), magnetic switching thresholds, temperature-compensated hysteresis, and real-world use cases aligned with automotive-qualified alternatives.

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 under EMI-prone conditions. Its band-gap regulator sustains stable operation across 4.2–28V supply range while maintaining consistent B_op/B_rp performance from –40°C to +125°C.

Magnetic response is polarity-specific: activation occurs only when south-pole flux exceeds B_op (120G typ) at the branded side; release requires flux decay below B_rp (60G typ). Output remains latched until magnetic field drops below release point - eliminating chatter in marginal-field environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.2V to 28V DC - supports direct connection to 12V/24V industrial rails without external regulation
Output Type	Open-collector, 25mA max sink - interfaces directly with microcontroller GPIO or relay drivers
B_op / B_rp	120G / 60G typical - provides reliable actuation margin for mechanical gap variations in cover detectors
Hysteresis	60G - prevents oscillation near threshold in vibrating or noisy magnetic environments
Operating Temp	–40°C to +125°C - qualified for under-hood and enclosed appliance applications
Power Dissipation	550mW (SIP-3 Bulk) - enables continuous operation at full load up to +85°C ambient
Output Saturation	400mV max @ 10mA - ensures logic-low compatibility with 3.3V/5V MCU inputs

Pinout & Package

AH337-PG-B uses SIP-3 (Bulk Pack) package: straight-lead, 3-pin single-in-line configuration with 2.57mm height, 14.0–15.0mm body length, and branded-side active area located 0.51mm below top surface.

Pin/Terminal	Circuit Role	Design Meaning
1 - Vdd	Positive power supply input	Accepts 4.2–28V; internal band-gap regulator powers analog core independently of rail noise
2 - GND	Ground reference	Common return for Hall sensor, amplifier, and output stage; must be low-impedance for stable hysteresis
3 - OUT	Open-collector output	Sinks up to 25mA; requires external pull-up to define logic-high level and interface voltage domain

Key Features

Feature	Design Value
Unipolar magnetic response	Detects only south-pole flux on branded side - simplifies mechanical design by eliminating polarity alignment checks
Temperature compensation	Maintains stable B_op/B_rp over –40°C to +125°C - avoids recalibration in thermal cycling environments
Wide supply range	Operates from 4.2V (functional enable) to 28V - eliminates need for separate LDO in 12V/24V systems
Lead-free & green compliance	Meets RoHS 3, halogen-free (<900ppm Br+Cl), antimony-free - satisfies global environmental compliance requirements

Applications

Cover Detection

DVD/CD Loader Actuation

Use Scenario: Detecting closure of appliance doors, printer covers, or safety guards in industrial enclosures.

IC Role / Device Role / Timing Role: Unipolar Hall switch providing latched ON/OFF state based on magnet proximity.

Use Value: Eliminates mechanical switches prone to wear; 60G hysteresis prevents false triggers during door vibration.

Use Scenario: Sensing tray insertion/ejection in optical disc drives and media handling mechanisms.

IC Role / Device Role / Timing Role: Magnetic position detector triggering motor control and status reporting.

Use Value: 25mA sink current directly drives indicator LEDs or enables logic-level signaling without buffer stages.

Home Appliance Safety Interlock

Speed Measurement (Low-Frequency)

Use Scenario: Verifying lid closure on washing machines or microwave ovens before enabling high-power operation.

IC Role / Device Role / Timing Role: Fail-safe proximity sensor interfacing with MCU watchdog or power controller.

Use Value: –40°C to +125°C rating ensures reliability in humid, thermally stressed appliance cavities.

Use Scenario: Monitoring rotational speed of fans, rollers, or conveyor belts using embedded magnets.

IC Role / Device Role / Timing Role: Edge-triggered magnetic pulse generator feeding timer/counters.

Use Value: 400mV max V_DS(SAT) guarantees clean low-state definition for accurate period measurement.

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
AL3373Q-GT1	AEC-Q100 Grade 1 qualified; tighter B_op/B_rp tolerance (±5G vs ±30G); higher ESD rating (±8kV HBM)	Required for automotive interior modules where PPAP and IATF 16949 traceability are mandatory	Select when functional safety documentation, change control, and extended temperature validation are required
US1881EUA-AMI	Higher B_op (180G typ); no integrated hysteresis - requires external RC network for noise immunity	Suitable for high-gap sensing (e.g., >3mm air gaps) but increases BOM count and layout complexity	Choose only if legacy design uses US1881 and magnetic path allows higher operate point

Compared with AL3373Q-GT1 and US1881EUA-AMI, AH337-PG-B offers optimal balance of cost, integrated hysteresis, and industrial-grade thermal range - making it ideal for non-automotive consumer and industrial equipment where qualification overhead is unnecessary.

Availability

AH337-PG-B is available at Aetrix Electronics and suitable for cover detection, home appliance interlocks, and optical drive actuation requiring stable component supply through extended production lifecycles.

Supply support for AH337-PG-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 centers across Asia and manufacturing in IATF 16949-certified facilities.

AH337 belongs to Diodes' Hall-effect sensor product line, engineered for cost-sensitive, high-volume contactless switching in white goods, office automation, and industrial controls - emphasizing robustness, wide voltage operation, and simplified integration.

FAQ

What is the magnetic polarity requirement for AH337-PG-B activation?

AH337-PG-B activates only when a south pole is presented to the branded side of the package. The device ignores north-pole fields and exhibits no response to reverse polarity - ensuring deterministic behavior in multi-magnet assemblies where stray fields may be present.

Can AH337-PG-B operate reliably at 3.3V supply?

No. AH337-PG-B requires minimum 4.2V to enable output switching, and magnetic characteristics stabilize only above 4.5V. At 3.3V, the device remains non-functional - a step-up converter or alternative low-voltage Hall switch (e.g., AH180x series) is required.

Is AH337-PG-B pin-compatible with AH337-PG-A or AH337-WG-7?

Yes - all AH337 variants share identical electrical functionality and 3-pin SIP-3 or SC59 pinouts (Vdd-GND-OUT). However, SIP-3 Bulk (PG-B) has straight leads versus spread leads in Ammo Pack (PG-A), and SC59 (WG-7) requires different PCB footprint and thermal relief design.

Why does the datasheet list AH337 as obsolete?

Diodes has discontinued AH337 in favor of the enhanced AH3377, which offers improved sensitivity, lower quiescent current, and updated packaging. AH337-PG-B remains available through Aetrix Electronics for legacy design support and last-time buys - with full traceability and documented lifecycle status.

AH337-PG-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-PG-B FAQ

1.How can I place an order for AH337-PG-B through Aetrix?

Please submit a Request for Quotation (RFQ) for AH337-PG-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-PG-B reliable?

The price and inventory of AH337-PG-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-PG-B is usually 5 days.

3.What payment methods are accepted for AH337-PG-B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH337-PG-B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AH337-PG-B?

AH337-PG-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AH337-PG-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-PG-B?

For technical support, including AH337-PG-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH337-PG-B requirements.

6.How does Aetrix verify that AH337-PG-B is sourced from the original manufacturer or authorized distributors?

All AH337-PG-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-PG-B meets industry standards.

7.What is the process for return or replacement of AH337-PG-B?

All AH337-PG-B units undergo pre-shipment inspection (PSI). If there is an issue with AH337-PG-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-PG-B part is unused and in its original packaging.

Return procedure for AH337-PG-B:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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