LTL-403G Equivalent & Substitute Parts

Part Overview

The LTL-403G is an active green diffused LED indicator manufactured by Lite-On Inc., designed for through-hole mounting applications. This component provides green light indication at 569nm dominant wavelength with a forward voltage of 2.1V and 3.7mcd brightness rating. The part is ROHS3 compliant and maintains unlimited moisture sensitivity level rating, making it suitable for standard industrial and consumer electronics applications. Substitute parts may be required due to inventory availability, lead time considerations, or specific application requirements within the allowed electrical and mechanical parameter ranges.

Substiute Parts

LTL-403G

Lite-On Inc.In Stock: 1037LTL-403G Datasheet

Current PartRFQ

WP144GDT

KingbrightIn Stock: 1991WP144GDT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LTL-403G is determined by the following critical parameters:

• Color and Wavelength: Green indication at 565-569nm dominant wavelength range
• Lens Configuration: Diffused rectangular lens with flat top geometry
• Mounting Interface: Through-hole radial package with 7.00mm maximum height
• Electrical Compatibility: Forward voltage range 2.1V to 2.2V; test current 10-20mA
• Optical Performance: Viewing angle minimum 104°; brightness rating 3.7mcd or higher
• Compliance: ROHS3 compliant; MSL 1 (Unlimited)

The WP144GDT from Kingbright meets all substitution criteria within these allowed parameter ranges and maintains functional equivalence for standard indication applications.

Parameter Comparison

Engineering Selection Recommendations

Both the LTL-403G and WP144GDT are active products with ROHS3 compliance and unlimited moisture sensitivity rating. The WP144GDT provides higher brightness output (6mcd versus 3.7mcd) and wider viewing angle (110° versus 104°), while maintaining compatible forward voltage and wavelength characteristics within standard green LED indication specifications. Both components are suitable for direct substitution in through-hole PCB applications where green indication is required. Selection between these parts should be based on inventory availability and specific brightness requirements for the target application.

Frequently Asked Questions (FAQ)

Q: Can WP144GDT replace LTL-403G in existing designs?

A: Yes. Both parts share identical mounting type (through-hole radial), package height (7.00mm maximum), and lens configuration (diffused rectangular). Forward voltage differs by 0.1V (2.1V to 2.2V), which is within standard LED tolerance ranges for indication applications. Circuit design should accommodate the test current specification of the selected part.

Q: What are the key differences between these parts?

A: The WP144GDT offers higher brightness (6mcd versus 3.7mcd) and wider viewing angle (110° versus 104°). Lens dimensions are slightly smaller (3.90mm x 1.90mm versus 4.00mm x 2.00mm). Test current specification is higher for the WP144GDT (20mA versus 10mA). Dominant wavelength is nearly identical (568nm versus 569nm).

Q: Are both parts RoHS compliant?

A: Yes. Both LTL-403G and WP144GDT are ROHS3 compliant with MSL 1 (Unlimited) rating, suitable for standard manufacturing and storage conditions.

Q: Does lens size difference affect mechanical fit?

A: Lens dimensions are within 0.1mm tolerance on each axis. Both parts maintain 7.00mm maximum height and radial through-hole package configuration. Mechanical fit in standard LED mounting holes is equivalent.

Q: What wavelength range is acceptable for green indication?

A: Both parts operate within the green spectrum at 565-569nm peak and dominant wavelengths, meeting standard green LED indication requirements.