LTST-T680KGKT Green LED 2-PLCC Equivalent & Substitute Parts

Part Overview

The LTST-T680KGKT is a green 571nm LED indicator manufactured by Lite-On Inc., designed for discrete indication applications in a 2-PLCC surface mount package. This part is discontinued at DiGi Electronics, making identification of equivalent substitute components essential for ongoing production and maintenance applications. The part operates at 2V forward voltage with a 20mA test current and delivers 92.5mcd luminous intensity with a 120° viewing angle.

Substiute Parts

LTST-T680KGKT

Lite-On Inc.In Stock: 883LTST-T680KGKT Datasheet

Current PartRFQ

LTST-T680KGWT

Lite-On Inc.In Stock: 1298LTST-T680KGWT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LTST-T680KGKT is determined by strict alignment of the following electrical and mechanical parameters:

• Color: Green (571nm dominant wavelength)
• Forward voltage: 2V nominal
• Test current: 20mA
• Viewing angle: 120°
• Mounting type: Surface mount
• Base product number: LTST-T680
• RoHS3 compliance and MSL rating

The LTST-T680KGWT qualifies as a direct substitute based on matching all critical electrical parameters. Variations in lens transparency (clear vs. diffused), millicandela rating (92.5mcd vs. 118mcd), and package designation (2-PLCC vs. 2-LCC J-Lead) represent acceptable engineering trade-offs within the same product family, provided circuit design accommodates the luminous intensity difference.

Parameter Comparison

Engineering Selection Recommendations

The LTST-T680KGWT is the qualified substitute for the discontinued LTST-T680KGKT. Both parts maintain identical electrical specifications (2V forward voltage, 20mA test current, 571nm dominant wavelength, 120° viewing angle) and share equivalent compliance certifications (ROHS3, MSL 3, REACH Unaffected).

The LTST-T680KGWT offers the advantage of active product status, ensuring continued availability and supply chain reliability. The increased luminous intensity (118mcd vs. 92.5mcd) provides enhanced brightness margin for indication applications. The diffused lens characteristic and marginally reduced height (1.90mm vs. 2.00mm) are compatible with standard PCB assembly processes and do not introduce mechanical constraints in typical mounting configurations.

Frequently Asked Questions (FAQ)

Q: Can the LTST-T680KGWT directly replace the LTST-T680KGKT in existing designs?

A: Yes. Both parts share identical forward voltage (2V), test current (20mA), dominant wavelength (571nm), and viewing angle (120°). The substitute operates within the same electrical operating envelope and maintains equivalent compliance certifications.

Q: What is the significance of the lens transparency difference (clear vs. diffused)?

A: Lens transparency affects light distribution characteristics. The clear lens (LTST-T680KGKT) produces more directional light output, while the diffused lens (LTST-T680KGWT) distributes light more uniformly across the viewing angle. Both maintain the specified 120° viewing angle. Circuit design should account for the 25.5mcd brightness increase in the substitute.

Q: Are there package compatibility considerations?

A: The main part uses 2-PLCC packaging while the substitute uses 2-LCC (J-Lead) packaging. Both are surface mount configurations with identical footprint dimensions (3.20mm L x 2.80mm W). PCB layout and reflow profiles should be verified against the specific package datasheet, though both packages are standard in surface mount assembly processes.

Q: What is the product status implication?

A: The LTST-T680KGKT is discontinued at DiGi Electronics, creating supply risk for new production. The LTST-T680KGWT maintains active status, ensuring long-term availability and supply chain continuity.

Q: Are RoHS and MSL ratings equivalent?

A: Yes. Both parts are ROHS3 compliant and carry MSL 3 (168 Hours) moisture sensitivity ratings, ensuring equivalent environmental and regulatory compliance for manufacturing and storage.