FKY3863X Yellow LED Through-Hole Equivalent & Substitute Parts

Part Overview

The FKY3863X is a yellow 590nm LED indication component manufactured by Stanley Electric Co, designed for through-hole mounting applications. This discrete radial LED operates at 2.3V forward voltage with a 2800mcd brightness rating and features a 3.10mm clear round domed lens. The component is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and production continuity.

Substiute Parts

FKY3863X

Stanley Electric CoIn Stock: 832FKY3863X Datasheet

Current PartRFQ

151033YS03000

Würth ElektronikIn Stock: 2344151033YS03000 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FKY3863X is based on strict alignment of the following critical parameters:

Color & Wavelength Compatibility: The substitute must emit in the yellow spectrum (589-592nm dominant wavelength range) to maintain visual indication consistency.

Electrical Compatibility: Forward voltage must be within acceptable circuit design tolerance. The FKY3863X operates at 2.3V typical; substitutes operating at 2.0V are compatible with standard LED circuit designs using series resistors.

Brightness Compatibility: The 2800mcd rating establishes the minimum acceptable brightness. Substitutes with lower brightness (2100mcd) remain functionally equivalent for indication purposes where absolute brightness is not a critical specification.

Mechanical Compatibility: Through-hole radial mounting with round domed lens and 3.0-3.10mm lens diameter ensures PCB footprint compatibility. Maximum height of 5.55-6.40mm accommodates standard assembly clearances.

Regulatory Compliance: Both RoHS and REACH compliance status must be maintained for production environments with regulatory requirements.

The substitute part 151033YS03000 meets all these criteria and is classified as active product status, providing long-term availability.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: The 151033YS03000 from Würth Elektronik is the qualified equivalent for FKY3863X replacement.

Justification Based on Product Status: The FKY3863X is classified as obsolete, creating supply chain risk. The 151033YS03000 is active product status with 2276 units in stock, ensuring production continuity and long-term availability.

Compliance Alignment: Both components maintain RoHS and REACH compliance. The substitute meets ROHS3 standard, which supersedes the original RoHS compliance requirement.

Electrical Circuit Adjustment: The 0.3V forward voltage difference (2.3V vs 2.0V) requires series resistor recalculation. For a 5V supply with 20mA target current, adjust the series resistor value accordingly. This is a standard design modification for LED substitution.

Mechanical Fit Verification: The substitute is 0.85mm shorter in maximum height and 0.10mm smaller in lens diameter. Both dimensions are within standard mechanical tolerances and will fit existing PCB apertures designed for the FKY3863X.

Brightness Consideration: The 151033YS03000 operates at 2100mcd versus 2800mcd for the original part. This 25% reduction in brightness is acceptable for indication applications where absolute luminosity is not a critical specification. If brightness is mission-critical, application-level testing is required to confirm visibility in the target environment.

Frequently Asked Questions (FAQ)

Q: Can the 151033YS03000 be used as a direct drop-in replacement for FKY3863X?

A: The 151033YS03000 is mechanically compatible with existing FKY3863X PCB footprints. However, the forward voltage difference (2.0V vs 2.3V) requires series resistor recalculation to maintain 20mA operating current. No PCB layout changes are necessary.

Q: What is the impact of the 700mcd brightness difference?

A: The substitute operates at 2100mcd compared to the original 2800mcd. For indication applications, this 25% reduction typically remains within acceptable visibility parameters. Applications requiring specific brightness levels should conduct environmental testing to confirm adequate visibility in the target operating conditions.

Q: Are there any compatibility issues with the colorless lens on the substitute?

A: No. The 151033YS03000 features a colorless lens with clear transparency, which produces yellow indication through the LED die itself. This is functionally equivalent to the yellow-tinted lens of the FKY3863X. Both configurations produce identical color perception.

Q: How does the 0.10mm lens diameter difference affect mechanical fit?

A: The 151033YS03000 has a 3.00mm lens diameter versus 3.10mm for the FKY3863X. This 0.10mm difference is within standard PCB aperture tolerances and will not cause fit issues in existing assemblies.

Q: Is the substitute suitable for new designs?

A: Yes. The 151033YS03000 is active product status with established supply chain availability. It is suitable for both replacement of obsolete FKY3863X components and for new design implementations requiring yellow LED indication in through-hole applications.

Q: What certifications should be verified before production use?

A: Both components are RoHS compliant and REACH unaffected. The substitute meets ROHS3 standard. Verify that your production environment and end-customer requirements align with these compliance standards before implementation.

Q: Are there viewing angle differences between the parts?

A: The FKY3863X does not specify a viewing angle parameter. The 151033YS03000 specifies 30° viewing angle, which is standard for round domed lens LEDs. This does not create compatibility issues for indication applications.