LTST-C171CKT Equivalent & Substitute Parts

Part Overview

The LTST-C171CKT is a red 638nm LED indication component in 0805 (2012 Metric) surface mount package manufactured by Lite-On Inc. This part is classified as obsolete, making substitute components necessary for new designs and ongoing production requirements. The component operates at 1.8V forward voltage with 25mcd brightness rating and 130° viewing angle, designed for discrete LED indication applications.

Substiute Parts

LTST-C171CKT

Lite-On Inc.In Stock: 1000316LTST-C171CKT Datasheet

Current PartRFQ

LTST-C171KDKT

Lite-On Inc.In Stock: 858LTST-C171KDKT Datasheet

MFR RecommendedRFQ

BR1112H-TR

Stanley Electric CoIn Stock: 1563BR1112H-TR Datasheet

MFR RecommendedRFQ

SML-LXF0805SIC-TR

Lumex Opto/Components Inc.In Stock: 1171SML-LXF0805SIC-TR Datasheet

MFR RecommendedRFQ

SML-LXF0805SRC-TR

Lumex Opto/Components Inc.In Stock: 3339SML-LXF0805SRC-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LTST-C171CKT is determined by the following critical parameters:

Primary Compatibility Criteria:

• Package / Case: 0805 (2012 Metric)
• Mounting Type: Surface Mount
• Color: Red
• Wavelength range: 638nm to 660nm dominant/peak wavelength
• Voltage - Forward (Vf): 1.7V to 2.0V
• Current - Test: 20mA
• RoHS Status: ROHS3 Compliant

Secondary Compatibility Factors:

• Lens Transparency: Clear or Diffused
• Millicandela Rating: 11.7mcd to 70mcd
• Viewing Angle: 120° to 150°

The substitute parts listed below meet the primary compatibility criteria and maintain functional equivalence within the specified electrical and mechanical parameters.

Parameter Comparison

Engineering Selection Recommendations

LTST-C171KDKT (Lite-On Inc.) This substitute is the primary recommendation. It maintains the same base product number (LTST-C171) and manufacturer as the original part. Product status is Active, ensuring long-term availability. Forward voltage is 2V versus 1.8V on the original, representing a 0.2V increase within acceptable tolerance for LED indication circuits. Millicandela rating of 24.75mcd matches the original specification. All compliance certifications (ROHS3, REACH Unaffected) are maintained. Packaging is Tape & Reel (TR) format.

SML-LXF0805SRC-TR (Lumex Opto/Components Inc.) This substitute is suitable for applications where higher brightness is acceptable. Product status is Active with confirmed inventory. Forward voltage is 1.7V, which is 0.1V lower than the original specification. Millicandela rating of 70mcd exceeds the original 25mcd, providing increased brightness output. Viewing angle of 120° is narrower than the original 130°. All compliance certifications are maintained. Packaging is Tape & Reel (TR) format.

BR1112H-TR (Stanley Electric Co) This substitute has Obsolete product status, limiting its suitability for new designs requiring long-term component availability. Forward voltage is 1.7V and millicandela rating is 11.7mcd, both lower than the original specification. Lens transparency is Diffused rather than Clear, affecting light distribution characteristics. Viewing angle of 150° is wider than the original. Use only when specific diffused lens characteristics are required and obsolete component status is acceptable.

Frequently Asked Questions (FAQ)

Q: Can LTST-C171KDKT directly replace LTST-C171CKT in existing designs? A: Yes. Both parts share the same base product number (LTST-C171), package (0805), mounting type (Surface Mount), and wavelength specifications. The forward voltage difference of 0.2V (2V vs 1.8V) is within typical LED circuit design tolerances. Verify circuit current-limiting resistor values accommodate the voltage change.

Q: What is the primary difference between LTST-C171KDKT and SML-LXF0805SRC-TR? A: LTST-C171KDKT maintains closer electrical specifications to the original part with 24.75mcd brightness. SML-LXF0805SRC-TR provides significantly higher brightness at 70mcd but with a narrower viewing angle (120° vs 130°). Select based on brightness and viewing angle requirements for your application.

Q: Why is BR1112H-TR listed as a substitute if it has Obsolete status? A: BR1112H-TR meets the primary compatibility criteria for package, mounting type, color, and wavelength. However, its Obsolete status and lower brightness rating (11.7mcd) make it unsuitable for new designs. It is listed for reference only in cases where existing inventory must be managed or specific diffused lens characteristics are required.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 Compliant status, matching the original LTST-C171CKT specification.

Q: What packaging formats are available for these substitutes? A: LTST-C171KDKT and SML-LXF0805SRC-TR are available in Tape & Reel (TR) format. BR1112H-TR is available in Cut Tape (CT) & Digi-Reel® format. Verify packaging requirements for your production process.

Q: How do lens transparency differences affect substitution? A: LTST-C171CKT, LTST-C171KDKT, and SML-LXF0805SRC-TR have Clear lens transparency, providing direct light transmission. BR1112H-TR has Diffused lens transparency, which scatters light over a wider area. Clear lenses are suitable for direct indication; diffused lenses are suitable for ambient light visibility. Select based on application requirements.