LTST-T670KGKT Equivalent & Substitute Parts

Part Overview

The LTST-T670KGKT is a green LED indicator manufactured by Lite-On Inc., designed for 2V discrete indication applications in a 2-PLCC surface mount package. This part is classified as obsolete, making substitute components necessary for new designs and ongoing production requirements. The original part delivers 60mcd brightness at 571nm wavelength with a 120° viewing angle and clear lens configuration.

Substiute Parts

LTST-T670KGKT

Lite-On Inc.In Stock: 723LTST-T670KGKT Datasheet

Current PartRFQ

AA3528ZGSK

KingbrightIn Stock: 18889AA3528ZGSK Datasheet

MFR RecommendedRFQ

SML-LX2832SRC-TR

Lumex Opto/Components Inc.In Stock: 16945SML-LX2832SRC-TR Datasheet

MFR RecommendedRFQ

SML-LX2832SUGC-TR

Lumex Opto/Components Inc.In Stock: 37271SML-LX2832SUGC-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LTST-T670KGKT are selected based on the following critical parameters:

Primary Compatibility Criteria:

• Package type: 2-PLCC surface mount configuration
• Lens transparency: Clear
• Mounting type: Surface mount
• Viewing angle: 120°
• Lens style: Round with flat top
• Color: Green (for direct functional replacement)
• Moisture sensitivity level: MSL 3 (168 Hours)

Acceptable Variation Parameters:

• Forward voltage (Vf): Within circuit design tolerance (2.0V to 3.3V range acceptable with appropriate current-limiting resistor adjustment)
• Millicandela rating: Higher brightness acceptable for indication applications
• Wavelength: Green spectrum (515nm to 574nm peak wavelength range)
• Physical dimensions: Minor variations acceptable within 2-PLCC footprint constraints

The substitute parts listed maintain mechanical and electrical compatibility while accommodating design flexibility for brightness and voltage requirements.

Parameter Comparison

Engineering Selection Recommendations

For Direct Green LED Replacement (Preferred):

AA3528ZGSK and SML-LX2832SUGC-TR are active production parts suitable for replacing the obsolete LTST-T670KGKT in green indication applications. Both maintain 2-PLCC package compatibility and 120° viewing angle specifications. AA3528ZGSK operates at 3.3V with 500mcd brightness, requiring circuit resistor adjustment from the original 2V design. SML-LX2832SUGC-TR operates at 2.2V with 150mcd brightness, providing closer voltage alignment to the original specification with minimal circuit modification.

Both substitute parts carry ROHS3 compliance certification, addressing regulatory requirements for new production designs where the original part's compliance status is not specified.

For Alternative Color Applications:

SML-LX2832SRC-TR is a red LED alternative in the same 2-PLCC package with identical mechanical and electrical interface characteristics. This part operates at 1.7V forward voltage and delivers 100mcd brightness. Selection of this part requires functional redesign to accommodate red indication instead of green.

All three substitute parts share identical MSL 3 (168 Hours) moisture sensitivity ratings, package footprints within tolerance, and surface mount compatibility with the original design.

Frequently Asked Questions (FAQ)

Q: Can AA3528ZGSK directly replace LTST-T670KGKT without circuit modification?

A: AA3528ZGSK maintains mechanical and package compatibility but operates at 3.3V versus the original 2V specification. Circuit current-limiting resistor values must be recalculated to accommodate the higher forward voltage while maintaining 20mA test current operation.

Q: What is the brightness difference between substitute parts and the original?

A: LTST-T670KGKT delivers 60mcd. AA3528ZGSK provides 500mcd (8.3x brighter), and SML-LX2832SUGC-TR provides 150mcd (2.5x brighter). Higher brightness is acceptable for indication applications and does not prevent substitution.

Q: Are all substitute parts available in the same packaging format?

A: Yes. All substitute parts use 2-PLCC surface mount packages with identical footprints and are available in Tape & Reel (TR) packaging for production volumes.

Q: Why is SML-LX2832SRC-TR listed as a substitute if it is red instead of green?

A: SML-LX2832SRC-TR is listed as a functional substitute for applications where color change is acceptable. It maintains identical 2-PLCC package, surface mount compatibility, 120° viewing angle, and MSL 3 moisture sensitivity. Selection requires design review to confirm red indication meets application requirements.

Q: What compliance certifications apply to substitute parts?

A: AA3528ZGSK, SML-LX2832SUGC-TR, and SML-LX2832SRC-TR all carry ROHS3 compliance certification. All parts maintain MSL 3 (168 Hours) moisture sensitivity level and EAR99 ECCN classification matching the original part.

Q: Are physical dimensions identical between the original and substitutes?

A: Dimensions are within tolerance. Original LTST-T670KGKT measures 3.20mm L x 2.70mm W x 2.05mm H. Substitutes measure 3.20mm L x 2.80mm W x 2.10mm H. These minor variations remain within 2-PLCC footprint specifications and do not affect PCB layout compatibility.