LTL2P3QSK Equivalent & Substitute Parts

Part Overview

The LTL2P3QSK is a yellow LED indicator from Lite-On Inc., featuring a 5mm T-1 3/4 through-hole package with 1000mcd brightness and a 587nm dominant wavelength. This part is classified as obsolete, making substitute components necessary for new designs and ongoing production requirements. The part operates at 2V forward voltage with a 20mA test current and provides a 22° viewing angle in a clear, domed lens configuration.

Substiute Parts

LTL2P3QSK

Lite-On Inc.In Stock: 1190LTL2P3QSK Datasheet

Current PartRFQ

LTL2H3KSK

Lite-On Inc.In Stock: 2207LTL2H3KSK Datasheet

DirectRFQ

WP7113SYCK

KingbrightIn Stock: 2617WP7113SYCK Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LTL2P3QSK is determined by the following critical parameters: lens size (5mm T-1 3/4), color (yellow), lens transparency (clear), mounting type (through hole), and package configuration (radial). The forward voltage tolerance, wavelength range, and brightness rating define acceptable operational equivalence. Both substitute parts maintain the same physical form factor, electrical interface, and optical characteristics within industry-standard tolerances for yellow LED indicators.

The two identified substitutes are:

• LTL2H3KSK (Lite-On Inc.): Direct manufacturer alternative with higher brightness (2500mcd) and slightly elevated forward voltage (2.05V)
• WP7113SYCK (Kingbright): Cross-manufacturer substitute with enhanced brightness (3000mcd) and maintained forward voltage (2V)

Parameter Comparison

Engineering Selection Recommendations

LTL2H3KSK is the preferred direct substitute from Lite-On Inc. It maintains manufacturer continuity while offering active product status and ROHS3 compliance. The 0.05V increase in forward voltage and 3nm wavelength shift remain within acceptable tolerances for yellow LED indicator applications. The higher brightness (2500mcd) provides improved visibility margin. This part is suitable for designs requiring Lite-On sourcing or where REACH compliance is mandatory.

WP7113SYCK from Kingbright serves as a cross-manufacturer alternative with active product status and ROHS3 compliance. It maintains the original 2V forward voltage specification and provides the highest brightness rating (3000mcd) among the three options. This part is appropriate for applications where cross-sourcing flexibility is required or where brightness enhancement is beneficial. REACH status is unaffected, which may simplify compliance documentation in certain supply chains.

Both substitutes are electrically and mechanically compatible with the LTL2P3QSK within standard LED indicator design parameters.

Frequently Asked Questions (FAQ)

Q: Can LTL2H3KSK directly replace LTL2P3QSK in existing designs?

A: Yes. Both parts share identical physical dimensions (5mm T-1 3/4, 8.70mm height), mounting type (through hole radial), and electrical interface (20mA test current). The 0.05V forward voltage difference and increased brightness are compatible with standard LED indicator circuits.

Q: What is the wavelength difference between the main part and substitutes?

A: The LTL2P3QSK operates at 587nm dominant wavelength, while both substitutes operate at 590nm. This 3nm shift remains within the yellow LED spectrum and is imperceptible to human vision in indicator applications.

Q: How do the brightness ratings compare?

A: The LTL2P3QSK provides 1000mcd, LTL2H3KSK provides 2500mcd, and WP7113SYCK provides 3000mcd. Higher brightness may require circuit current limiting adjustment to maintain consistent indicator intensity if desired.

Q: Are there viewing angle differences?

A: Yes. The LTL2P3QSK has a 22° viewing angle, LTL2H3KSK has 15°, and WP7113SYCK has 20°. Narrower viewing angles concentrate light intensity but reduce peripheral visibility. Circuit design should account for application-specific visibility requirements.

Q: What compliance certifications apply to the substitutes?

A: LTL2H3KSK carries ROHS3 and REACH Affected status. WP7113SYCK carries ROHS3 compliance with REACH Unaffected status. Both parts share EAR99 export classification and 8541.41.0000 HTSUS code with the original part.

Q: Is packaging type a consideration for substitution?

A: The LTL2P3QSK is supplied in tape packaging, while both substitutes are supplied in bulk. This affects handling and assembly processes but does not impact electrical or mechanical compatibility.