LTL-231 Equivalent & Substitute Parts

Part Overview

The LTL-231 is a green diffused through-hole LED manufactured by Lite-On Inc., designed for indication applications with a dominant wavelength of 569nm. This part is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. The LTL-231 operates at a forward voltage of 2.1V with a test current of 20mA, providing 8.7mcd brightness in a 3mm diffused lens package.

Substiute Parts

LTL-231

Lite-On Inc.In Stock: 926LTL-231 Datasheet

Current PartRFQ

5GD-F

Bivar Inc.In Stock: 11055GD-F Datasheet

MFR RecommendedRFQ

5GT-F

Bivar Inc.In Stock: 11255GT-F Datasheet

MFR RecommendedRFQ

SSL-LX80113SGD

Lumex Opto/Components Inc.In Stock: 995SSL-LX80113SGD Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LTL-231 is determined by the following critical parameters: color (green), lens transparency (diffused), forward voltage (2.1V), test current (20mA), mounting type (through hole), and package type (radial). All substitute parts must maintain compatibility with these core electrical and mechanical specifications.

The identified substitutes are grouped as follows:

Group 1: Bivar Inc. T-1 3/4 Series (5GD-F and 5GT-F) These parts share identical forward voltage (2.1V) and test current (20mA) with the LTL-231. Both are active products with radial through-hole mounting. The 5GD-F maintains diffused lens transparency matching the original part, while the 5GT-F offers clear lens transparency as an alternative. Both feature peak wavelengths of 568nm, within the green spectrum range.

Group 2: Lumex Opto/Components Inc. (SSL-LX80113SGD) This part provides an 8mm T-8 form factor alternative with 565nm peak wavelength and diffused lens transparency. It maintains the same electrical specifications (2.1V forward voltage, 20mA test current) and through-hole mounting configuration.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts are active products with ROHS3 compliance and MSL 1 rating, providing long-term availability and environmental compliance advantages over the obsolete LTL-231.

For direct form factor replacement with diffused lens: The 5GD-F offers the closest electrical match with identical forward voltage and test current. The increased lens size (5mm T-1 3/4 versus 3mm) and higher brightness (25mcd versus 8.7mcd) must be evaluated against PCB layout constraints and optical design requirements.

For maximum brightness with diffused lens: The 5GT-F provides the highest brightness output (40mcd) with clear lens transparency, suitable for applications requiring enhanced visibility. The clear lens produces higher intensity compared to diffused alternatives.

For alternative form factor: The SSL-LX80113SGD offers an 8mm T-8 package with diffused lens and peak wavelength matching the original LTL-231 (565nm). This option accommodates different PCB hole spacing and mechanical mounting requirements.

Frequently Asked Questions (FAQ)

Q: Can the 5GD-F and 5GT-F be used interchangeably with the LTL-231? A: Both parts share identical electrical specifications (2.1V forward voltage, 20mA test current) and through-hole radial mounting. The primary differences are lens size (5mm versus 3mm), brightness output, and lens transparency. PCB layout and optical design must accommodate the larger form factor.

Q: What is the difference between the 5GD-F and 5GT-F? A: Both are Bivar T-1 3/4 packages with identical electrical and mechanical specifications. The 5GD-F features a diffused lens (8.7mcd equivalent brightness), while the 5GT-F features a clear lens (40mcd brightness). Lens transparency selection depends on application requirements for light diffusion versus intensity.

Q: Does the SSL-LX80113SGD require different PCB hole spacing? A: The SSL-LX80113SGD uses an 8mm T-8 form factor with radial leads, differing from the 3mm and 5mm packages of other alternatives. PCB hole spacing and mechanical clearance must be verified before substitution.

Q: Are all substitute parts RoHS compliant? A: Yes. The 5GD-F, 5GT-F, and SSL-LX80113SGD are all ROHS3 compliant with MSL 1 rating, providing environmental compliance and unlimited moisture sensitivity protection.

Q: What wavelength range should be expected from these substitutes? A: All substitutes operate in the green spectrum. The LTL-231 and SSL-LX80113SGD both specify 565nm peak wavelength, while the Bivar parts (5GD-F and 5GT-F) specify 568nm peak wavelength. These values fall within acceptable green LED indication ranges.