LTL2T3YR6JS Equivalent & Substitute Parts

Part Overview

The LTL2T3YR6JS is an amber diffused LED indicator manufactured by Lite-On Inc., designed for through-hole mounting applications. This T-1 3/4 (5mm) component operates at 2.1V forward voltage with a 1500mcd brightness rating and 590nm dominant wavelength. The product is currently obsolete, making substitute parts necessary for ongoing production, maintenance, and design updates. Equivalent components must maintain mechanical compatibility, electrical performance within acceptable ranges, and functional equivalence for amber indication applications.

Substiute Parts

LTL2T3YR6JS

Lite-On Inc.In Stock: 1068LTL2T3YR6JS Datasheet

Current PartRFQ

LTL2R3FU3JSR

Lite-On Inc.In Stock: 1066LTL2R3FU3JSR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LTL2T3YR6JS is determined by the following critical parameters:

Mechanical Compatibility: Lens size (5mm T-1 3/4), lens style (round with domed top), mounting type (through hole), and package type (radial) must remain identical to ensure physical fit in existing PCB layouts and assemblies.

Optical Compatibility: Lens transparency (diffused) and color (amber) must match to maintain consistent visual indication characteristics.

Electrical Compatibility: Forward voltage (Vf), test current (20mA), and brightness rating (millicandela) may vary within acceptable operational ranges. Wavelength may shift within the amber spectrum (590–610nm range) while maintaining functional equivalence for indication purposes.

Product Status Consideration: The main part is obsolete; active substitute parts are preferred for long-term availability and supply chain reliability.

The LTL2R3FU3JSR meets all mechanical and optical requirements and is classified as an MFR-recommended substitute by Lite-On Inc.

Parameter Comparison

Engineering Selection Recommendations

The LTL2R3FU3JSR is the manufacturer-recommended substitute for the obsolete LTL2T3YR6JS. Selection should be based on the following factors:

Product Status: The substitute part is active and in production, ensuring long-term availability and supply chain continuity compared to the obsolete main part.

Compliance: The LTL2R3FU3JSR is ROHS3 compliant, meeting current environmental and regulatory requirements for electronic components in most markets.

Electrical Performance: The substitute operates at 1.9V forward voltage (0.2V lower than the main part) at the same 20mA test current. This lower voltage may reduce power consumption in series resistor circuits. The higher brightness rating (1690mcd vs. 1500mcd) provides improved visibility.

Mechanical Fit: Both parts share identical lens size, style, mounting type, and package configuration, ensuring direct PCB layout compatibility without redesign.

Optical Characteristics: Both parts maintain diffused amber indication. The wavelength shift from 590nm to 604nm remains within the amber spectrum and is imperceptible to human vision for indication applications.

Physical Dimensions: The substitute is shorter (8.70mm vs. 12.40mm maximum height), which may affect clearance in space-constrained assemblies. Verify mechanical fit in the target application.

Moisture Sensitivity: The substitute has MSL 2A (4 weeks) compared to MSL 1 (unlimited) for the main part. Implement appropriate moisture control during storage and handling per IPC standards.

Frequently Asked Questions (FAQ)

Q: Can the LTL2R3FU3JSR be used as a direct replacement for the LTL2T3YR6JS?

A: Yes, for most applications. Both parts share identical mechanical and optical specifications (5mm T-1 3/4 diffused amber LED, through-hole radial package). The electrical parameters differ slightly: the substitute operates at 1.9V instead of 2.1V and provides higher brightness (1690mcd vs. 1500mcd). Verify that your circuit design accommodates the lower forward voltage and higher brightness.

Q: What is the impact of the 0.2V forward voltage difference?

A: In series resistor circuits, the lower forward voltage of the substitute will result in slightly higher current through the resistor and potentially brighter LED operation. Recalculate series resistor values if precise current limiting is required. For most indication applications, this difference is negligible.

Q: Does the shorter height of the substitute part affect compatibility?

A: The LTL2R3FU3JSR is 8.70mm tall compared to 12.40mm for the main part. This 3.7mm reduction may improve clearance in space-constrained designs but could affect visual alignment if the original design relied on the taller profile. Verify mechanical fit in your specific PCB layout and enclosure.

Q: What is the difference in viewing angle between these parts?

A: The main part has a 60° viewing angle, while the substitute has a 30° viewing angle. The narrower viewing angle of the substitute concentrates light output, contributing to its higher brightness rating. For applications requiring wide-angle visibility, this difference may be significant.

Q: Are there any storage or handling differences?

A: The substitute has MSL 2A (4 weeks) moisture sensitivity compared to MSL 1 (unlimited) for the main part. Store the substitute in dry conditions and use within 4 weeks of opening the moisture barrier bag. The main part has no moisture sensitivity restrictions.

Q: Is the substitute RoHS compliant?

A: Yes, the LTL2R3FU3JSR is ROHS3 compliant. The main part's RoHS status is not specified. Use the substitute for applications requiring RoHS compliance.

Q: Can I use the substitute in existing designs without circuit modifications?

A: In most cases, yes. The mechanical and optical compatibility is complete. However, if your circuit design is sensitive to forward voltage variations or requires specific brightness levels, recalculate series resistor values and verify brightness output in your application.