LTL-555-14 Equivalent & Substitute Parts

Part Overview

The LTL-555-14 is a quad-wide yellow LED circuit board indicator manufactured by Lite-On Inc., featuring a 5mm T-1 3/4 form factor with clear, tinted lens and domed top. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. The part operates at 2.1V with 80mA current rating and delivers 29mcd luminous intensity at a 30° viewing angle, suitable for standard PCB-mounted indicator applications.

Substiute Parts

LTL-555-14

Lite-On Inc.In Stock: 956LTL-555-14 Datasheet

Current PartRFQ

SSF-LXH400YD

Lumex Opto/Components Inc.In Stock: 1052SSF-LXH400YD Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LTL-555-14 is determined by the following critical parameters:

• Color and Wavelength: Yellow emitters at 585nm peak wavelength
• Configuration: 4-wide quad LED arrangement
• Lens Geometry: 5mm T-1 3/4 form factor with round domed top
• Voltage Rating: 2.1V forward voltage compatibility
• Mounting Type: Through-hole technology for PCB integration
• Regulatory Compliance: EAR99 classification and HTSUS code alignment

The SSF-LXH400YD from Lumex Opto/Components Inc. qualifies as a substitute based on matching color, wavelength, configuration, lens geometry, voltage rating, and mounting technology. Differences in current rating (20mA vs. 80mA), lens diffusion (diffused vs. clear/tinted), and millicandela output reflect design variations within the same functional category and do not preclude substitution when circuit design accommodates the lower current specification.

Parameter Comparison

Engineering Selection Recommendations

The SSF-LXH400YD is the primary substitute for the obsolete LTL-555-14. Selection is supported by the following factors:

Compliance and Regulatory Status: The SSF-LXH400YD carries active product status with ROHS3 compliance and REACH unaffected designation, providing superior regulatory support compared to the obsolete LTL-555-14. Both parts share identical ECCN and HTSUS classifications, ensuring consistent export and tariff treatment.

Moisture Sensitivity: The SSF-LXH400YD features MSL 1 (unlimited shelf life) versus MSL 2A (4-week limit) for the LTL-555-14, reducing storage and handling constraints in manufacturing environments.

Electrical and Optical Compatibility: Matching voltage rating (2.1V), color (yellow), wavelength (585nm), and configuration (4-wide) establish functional equivalence. The reduced current specification (20mA vs. 80mA) requires circuit-level verification to confirm compatibility with existing current-limiting designs.

Mechanical Fit: Identical lens geometry (5mm T-1 3/4, round domed top) and through-hole mounting ensure PCB footprint compatibility. The right-angle mounting option of the SSF-LXH400YD provides additional design flexibility for space-constrained layouts.

Frequently Asked Questions (FAQ)

Q: Can the SSF-LXH400YD directly replace the LTL-555-14 without circuit modifications?

A: Direct replacement is possible if the circuit design accommodates the 20mA current specification of the SSF-LXH400YD. The LTL-555-14 operates at 80mA; circuits designed for this higher current must be re-evaluated. Verify that current-limiting resistors and power supply capacity support the lower 20mA requirement.

Q: Are there mechanical differences between these parts?

A: Both parts use identical 5mm T-1 3/4 lens geometry with round domed tops and through-hole mounting. The SSF-LXH400YD offers a right-angle mounting variant, which may require PCB layout adjustment if the original design used straight-through mounting.

Q: What is the impact of the diffused lens on the SSF-LXH400YD versus the clear, tinted lens of the LTL-555-14?

A: The diffused lens of the SSF-LXH400YD produces a broader light distribution compared to the clear, tinted lens of the LTL-555-14. This affects visual appearance and perceived brightness in the application. Optical performance must be evaluated in the specific end-use context.

Q: Why is the SSF-LXH400YD classified as active while the LTL-555-14 is obsolete?

A: The LTL-555-14 has been discontinued by Lite-On Inc. and is no longer manufactured. The SSF-LXH400YD from Lumex Opto/Components Inc. remains in active production, ensuring long-term availability and supply chain continuity.

Q: Are there compliance advantages to using the SSF-LXH400YD?

A: Yes. The SSF-LXH400YD carries ROHS3 compliance certification and REACH unaffected status, meeting current environmental and regulatory requirements. The LTL-555-14 compliance status is not specified, which may present regulatory risk in new designs or markets with strict environmental standards.

Q: What is the significance of the MSL rating difference?

A: The SSF-LXH400YD has MSL 1 (unlimited shelf life), while the LTL-555-14 has MSL 2A (4-week limit). This means the SSF-LXH400YD can be stored indefinitely under standard conditions, reducing inventory management complexity and minimizing risk of moisture-induced failures during extended storage.