LTST-C150KYKT Equivalent & Substitute Parts

Part Overview

The LTST-C150KYKT is an amber 592nm LED indicator manufactured by Lite-On Inc. in a 1206 (3216 Metric) surface mount package. This component is classified as obsolete, making substitute parts necessary for ongoing production and maintenance applications. The part delivers 50mcd brightness at 2V forward voltage with a 130° viewing angle and clear lens configuration.

Substiute Parts

LTST-C150KYKT

Lite-On Inc.In Stock: 775LTST-C150KYKT Datasheet

Current PartRFQ

AP3216SYCK

KingbrightIn Stock: 1902AP3216SYCK Datasheet

MFR RecommendedRFQ

FY1105W-TR

Stanley Electric CoIn Stock: 2783FY1105W-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LTST-C150KYKT are selected based on the following critical parameters that determine functional compatibility:

Package Compatibility: All substitute parts must use the 1206 (3216 Metric) surface mount package with identical footprint dimensions (3.20mm L x 1.60mm W) to ensure PCB compatibility without layout modifications.

Electrical Parameters: Forward voltage (Vf) must remain within acceptable operating range (1.9V to 2V) to function with existing circuit designs. Test current is standardized at 20mA across all candidates.

Optical Characteristics: Wavelength range (590nm to 595nm) ensures visual compatibility within the amber-yellow spectrum. Millicandela rating may vary (50mcd to 180mcd) based on application requirements.

Environmental Compliance: All substitute parts maintain REACH Unaffected status and EAR99 ECCN classification, matching the original part's regulatory profile.

The LTST-C150KYKT's obsolete status necessitates substitution. Available alternatives include the AP3216SYCK (Kingbright) and FY1105W-TR (Stanley Electric Co), both active products with compatible electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

AP3216SYCK (Kingbright): This substitute maintains identical forward voltage (2V) and test current (20mA) specifications. The package footprint and height (1.10mm) match the original part exactly, enabling direct PCB replacement without layout modifications. Product status is active with ROHS3 compliance and MSL 3 rating. Brightness is increased to 150mcd with a slightly narrower viewing angle (120° versus 130°). Wavelength shift from 592nm (amber) to 590nm (yellow) represents a minor spectral change within the amber-yellow spectrum.

FY1105W-TR (Stanley Electric Co): This substitute operates at 1.9V forward voltage, which is 0.1V lower than the original specification. The part is active with ROHS3 compliance. Brightness reaches 180mcd with a significantly narrower viewing angle (50°). Height is increased to 2.05mm, which may present clearance constraints in compact assemblies. Lens style changes from rectangular flat-top to round domed-top. MSL rating is 4 (72 Hours), indicating higher moisture sensitivity compared to the original MSL 3 (168 Hours). This part is suitable only where the reduced viewing angle and increased height do not conflict with application requirements.

Both substitutes maintain regulatory compliance (REACH Unaffected, EAR99 ECCN) and are available in active production status, ensuring long-term supply continuity.

Frequently Asked Questions (FAQ)

Q: Can the AP3216SYCK directly replace the LTST-C150KYKT without circuit modifications?

A: Yes. The AP3216SYCK maintains identical forward voltage (2V), test current (20mA), and package dimensions (3.20mm L x 1.60mm W, 1.10mm height). The wavelength shift from 592nm to 590nm is within the amber-yellow spectrum and does not require circuit redesign.

Q: What is the primary difference between the two substitute options?

A: The AP3216SYCK provides a direct mechanical and electrical replacement with matching voltage and package height. The FY1105W-TR operates at lower voltage (1.9V), features increased brightness (180mcd), but has a significantly narrower viewing angle (50°) and greater height (2.05mm), requiring application-specific evaluation.

Q: Does the color shift from amber (592nm) to yellow (590nm) affect functionality?

A: The wavelength difference of 2nm is visually imperceptible to the human eye and remains within the amber-yellow spectrum. Selection depends on application requirements for specific color indication.

Q: Are there PCB layout considerations for the FY1105W-TR substitute?

A: Yes. The FY1105W-TR has a maximum height of 2.05mm compared to 1.10mm for the original part. Verify clearance above the component in confined spaces. The round domed lens also differs from the rectangular flat-top lens of the original part.

Q: What is the impact of MSL rating differences?

A: The original part and AP3216SYCK both have MSL 3 (168 Hours), allowing 168 hours of exposure to 85°C/85% RH before soldering. The FY1105W-TR has MSL 4 (72 Hours), requiring soldering within 72 hours of moisture exposure. This affects storage and handling procedures in humid environments.

Q: Are all substitute parts RoHS compliant?

A: Both substitute parts (AP3216SYCK and FY1105W-TR) are ROHS3 compliant. The original LTST-C150KYKT does not specify RoHS status but maintains REACH Unaffected classification matching the substitutes.

Q: What viewing angle should be selected for my application?

A: The original part provides 130° viewing angle. The AP3216SYCK offers 120° (minimal reduction), suitable for most applications. The FY1105W-TR provides only 50° viewing angle, appropriate only for applications requiring narrow-angle indication.