LTL42CW65AT Equivalent & Substitute Parts

Part Overview

The LTL42CW65AT is a white LED indicator in T-1 through-hole package manufactured by Lite-On Inc. This part is classified as obsolete, making substitute identification necessary for ongoing production and maintenance applications. The device features a 3mm clear domed lens with 2600mcd brightness rating and operates at 3.7V forward voltage with 20mA test current. Equivalent parts must maintain functional compatibility across mounting type, lens configuration, and electrical performance parameters.

Substiute Parts

LTL42CW65AT

Lite-On Inc.In Stock: 1015LTL42CW65AT Datasheet

Current PartRFQ

LTW-420D7

Lite-On Inc.In Stock: 1974LTW-420D7 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LTL42CW65AT is determined by the following critical parameters:

• Lens Configuration: Identical 3mm T-1 round domed clear lens required for mechanical fit and optical performance
• Mounting Type: Through-hole radial package mandatory for PCB compatibility
• Color: White LED specification
• Electrical Compatibility: Forward voltage and test current within acceptable operating range for circuit design
• Physical Dimensions: Height and form factor must accommodate existing board layouts
• Moisture Sensitivity: MSL rating of 1 (Unlimited) acceptable for standard handling

The LTW-420D7 qualifies as a direct substitute based on matching lens size, style, transparency, mounting type, package configuration, and moisture sensitivity level. Both parts share identical viewing angle and test current specifications.

Parameter Comparison

Engineering Selection Recommendations

The LTW-420D7 is the qualified substitute for the obsolete LTL42CW65AT. Selection is supported by:

• Product Status: LTW-420D7 maintains active production status, ensuring long-term availability and supply chain continuity
• Compliance: Both parts carry identical MSL rating (1 - Unlimited) and ECCN classification (EAR99)
• Mechanical Compatibility: Identical lens configuration, mounting type, and package style ensure direct PCB fit without layout modification
• Electrical Performance: Forward voltage difference of 0.4V (3.7V to 3.3V) is within typical circuit design tolerance for LED indicator applications
• Optical Performance: Higher millicandela rating (5000mcd vs 2600mcd) provides improved brightness margin
• Physical Fit: Reduced height (5.25mm vs 6.55mm) offers improved clearance in constrained board layouts

Frequently Asked Questions (FAQ)

Q: Can LTW-420D7 be used as a direct replacement for LTL42CW65AT without circuit modification?

A: Yes. Both parts share identical lens size, style, transparency, mounting type, package configuration, viewing angle, and test current. The 0.4V forward voltage difference is within standard LED circuit design tolerance.

Q: What is the impact of the 2400mcd brightness difference between the two parts?

A: The LTW-420D7 provides higher brightness (5000mcd vs 2600mcd). For indicator applications, this represents improved visibility margin. Circuit current limiting resistors may require adjustment if precise brightness matching is required for the application.

Q: Does the 1.3mm height difference affect PCB compatibility?

A: The LTW-420D7 is shorter (5.25mm vs 6.55mm). This provides improved clearance in applications with height constraints. No modification to PCB footprint or mounting holes is required.

Q: Are there any compliance or certification differences?

A: Both parts carry identical MSL rating (1 - Unlimited) and ECCN classification (EAR99). LTW-420D7 includes additional RoHS3 and REACH compliance documentation.

Q: Why is LTL42CW65AT classified as obsolete?

A: Obsolete status indicates the part is no longer in active production. LTW-420D7 is the active equivalent from the same manufacturer, providing continued access to functionally compatible white T-1 LED indicators.

Q: What packaging options are available for LTW-420D7?

A: LTW-420D7 is supplied in bulk packaging, suitable for production assembly environments.