LTST-T670GKT Equivalent & Substitute Parts

Part Overview

The LTST-T670GKT is a green LED indicator manufactured by Lite-On Inc., designed for discrete indication applications. This component features a 569nm dominant wavelength with 20mcd brightness rating in a 2-SMD, J-Lead surface mount package. The product is currently obsolete, making identification of compatible substitute parts essential for ongoing production and maintenance applications. Equivalent parts must maintain functional compatibility across electrical characteristics, mechanical dimensions, and mounting requirements.

Substiute Parts

LTST-T670GKT

Lite-On Inc.In Stock: 3306LTST-T670GKT Datasheet

Current PartRFQ

SML-LX2832GC-TR

Lumex Opto/Components Inc.In Stock: 3266SML-LX2832GC-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LTST-T670GKT is determined by strict alignment of the following critical parameters:

• Color and Wavelength: Green spectrum (565nm peak wavelength) for visual indication compatibility
• Forward Voltage (Vf): 2.1V typical to ensure circuit compatibility without redesign
• Viewing Angle: 120° to maintain optical performance in the application
• Lens Configuration: Round with flat top, clear lens for consistent appearance and light transmission
• Package Type: 2-PLCC surface mount configuration for PCB footprint compatibility
• Mounting Dimensions: Maximum height 2.05mm to 2.10mm and length/width within 3.20mm range for board clearance
• Moisture Sensitivity: MSL 3 (168 Hours) for handling and storage compatibility

The SML-LX2832GC-TR from Lumex Opto/Components Inc. meets all substitution criteria within the allowed parameter tolerances.

Parameter Comparison

Engineering Selection Recommendations

The SML-LX2832GC-TR is the qualified substitute for the obsolete LTST-T670GKT based on the following engineering criteria:

Electrical Compatibility: Both parts operate at 2.1V forward voltage with 120° viewing angle, ensuring direct circuit compatibility without modification to drive circuitry or current-limiting resistor calculations.

Optical Performance: Peak wavelength alignment at 565nm maintains color consistency in indication applications. The substitute's 25mcd brightness rating exceeds the original 20mcd specification, providing improved visibility margin without adverse effects on circuit operation.

Mechanical Fit: Dimensional compatibility within 0.10mm width and 0.05mm height tolerances ensures PCB footprint compatibility and board clearance requirements are maintained.

Product Status and Compliance: The substitute is in active production status, ensuring long-term availability. RoHS3 compliance of the substitute meets current regulatory requirements, while both parts maintain identical REACH, ECCN, and HTSUS classifications.

Packaging and Handling: Identical MSL 3 (168 Hours) rating ensures equivalent moisture sensitivity handling and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can the SML-LX2832GC-TR be used as a direct replacement for the LTST-T670GKT without PCB modifications?

A: Yes. Both parts share identical forward voltage (2.1V), viewing angle (120°), and package family (2-PLCC). Dimensional differences (0.10mm width, 0.05mm height) are within standard PCB tolerance and do not require footprint redesign.

Q: What is the difference between the 2-SMD, J-Lead package and the 2-PLCC package?

A: Both designations refer to the same 2-lead surface mount package family used for discrete LEDs. The 2-PLCC (Plastic Leaded Chip Carrier) is the standard package classification. The J-Lead refers to the lead configuration. These are compatible package types for this application.

Q: Does the higher brightness rating (25mcd vs. 20mcd) of the substitute affect circuit operation?

A: No. The substitute's higher brightness is achieved through improved LED die efficiency, not increased forward voltage or test current requirements. Circuit operation remains identical at the specified 2.1V forward voltage.

Q: Are there any compliance or regulatory differences between the two parts?

A: The substitute (SML-LX2832GC-TR) is RoHS3 compliant, meeting current regulatory standards. Both parts share identical REACH, ECCN, and HTSUS classifications, ensuring equivalent regulatory treatment.

Q: What is the significance of the MSL 3 (168 Hours) rating?

A: MSL 3 indicates Moisture Sensitivity Level 3, requiring storage at controlled humidity and a maximum of 168 hours of floor life after package opening before reflow soldering. Both parts have identical MSL ratings, ensuring equivalent handling and storage protocols.

Q: Can the substitute be used in applications requiring the exact 569nm dominant wavelength specification?

A: The substitute's peak wavelength is specified as 565nm. While dominant wavelength is not provided for the substitute, the peak wavelength alignment ensures optical performance compatibility. Applications with strict dominant wavelength requirements should conduct spectral verification testing.