LTST-C150UBKT Equivalent & Substitute Parts

Part Overview

The LTST-C150UBKT is a blue LED indicator in 1206 (3216 Metric) surface mount package manufactured by Lite-On Inc. This component is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. The part features a clear lens with 466nm dominant wavelength and 3.8V forward voltage rating, designed for discrete LED indication applications requiring 20mA test current.

Substiute Parts

LTST-C150UBKT

Lite-On Inc.In Stock: 975LTST-C150UBKT Datasheet

Current PartRFQ

LTST-C150TBKT

Lite-On Inc.In Stock: 164345LTST-C150TBKT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LTST-C150UBKT is determined by the following critical parameters:

• Package compatibility: 1206 (3216 Metric) surface mount form factor
• Color: Blue LED indication
• Lens configuration: Clear lens with rectangle flat-top style
• Mechanical dimensions: 3.20mm L x 1.60mm W, 1.10mm max height
• Electrical operating range: Forward voltage and test current compatibility
• Wavelength range: Blue spectrum (460nm–480nm acceptable range)
• Viewing angle: 130° standard for this package class
• Moisture sensitivity: MSL 3 classification

The LTST-C150TBKT qualifies as a direct substitute based on identical package, color, lens type, mechanical dimensions, and viewing angle. Electrical parameters (Vf and wavelength) fall within acceptable substitution tolerances for blue LED indication circuits.

Parameter Comparison

Engineering Selection Recommendations

The LTST-C150TBKT is the qualified substitute for the obsolete LTST-C150UBKT. Selection is based on the following factors:

• The substitute maintains identical mechanical compatibility: same 1206 package footprint, dimensions, and mounting type
• Both parts share identical MSL 3 moisture sensitivity classification and identical regulatory compliance (REACH Unaffected, EAR99, HTSUS 8541.41.0000)
• The substitute is in active production status, ensuring long-term availability and supply chain continuity
• Electrical parameters are compatible within standard blue LED indication circuit design tolerances
• The substitute exhibits higher luminous intensity (104mcd vs. 4.5mcd), which may require circuit-level current limiting adjustment depending on application requirements

Frequently Asked Questions (FAQ)

Q: Can LTST-C150TBKT be used as a direct drop-in replacement for LTST-C150UBKT?

A: Yes, from a mechanical and package perspective. The substitute shares identical 1206 package dimensions, footprint, and mounting type. Circuit designers must account for the 0.5V forward voltage difference (3.3V vs. 3.8V) and the significantly higher luminous intensity (104mcd vs. 4.5mcd) when selecting current-limiting resistor values.

Q: What are the key differences between these parts?

A: The primary differences are product status (obsolete vs. active), forward voltage (3.8V vs. 3.3V), dominant wavelength (466nm vs. 470nm), and luminous intensity (4.5mcd vs. 104mcd). All other parameters—package, dimensions, viewing angle, and compliance certifications—are identical.

Q: Are there any compliance or regulatory concerns with substitution?

A: No. Both parts share identical REACH, ECCN, and HTSUS classifications. Moisture sensitivity levels are identical (MSL 3, 168 Hours). No regulatory barriers exist for substitution.

Q: How does the higher brightness of LTST-C150TBKT affect circuit design?

A: The substitute's 104mcd rating versus the original's 4.5mcd requires recalculation of current-limiting resistor values to maintain desired brightness levels. Forward voltage difference (3.3V vs. 3.8V) also affects resistor selection in series circuits.

Q: Is LTST-C150TBKT available in the same packaging options?

A: The substitute is supplied in Cut Tape (CT) and Digi-Reel packaging, whereas the original part number references standard packaging. Both are suitable for automated assembly processes.