LTL-3231A Equivalent & Substitute Parts

Part Overview

The LTL-3231A is a green diffused through-hole LED manufactured by Lite-On Inc., designed for indication applications with a dominant wavelength of 569nm. This component is currently classified as obsolete, making substitute parts necessary for ongoing production and maintenance applications. The LTL-433G serves as the manufacturer-recommended equivalent, offering compatible electrical and mechanical characteristics while maintaining active product status.

Substiute Parts

LTL-3231A

Lite-On Inc.In Stock: 1150LTL-3231A Datasheet

Current PartRFQ

LTL-433G

Lite-On Inc.In Stock: 18246LTL-433G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The LTL-433G is qualified as a direct substitute for the LTL-3231A based on the following critical parameters:

• Electrical Compatibility: Identical forward voltage (2.1V) and test current (20mA)
• Optical Characteristics: Matching color (green), wavelength specifications (dominant 569nm, peak 565nm), lens transparency (diffused), and viewing angle (140°)
• Mechanical Compatibility: Identical lens size (5.00mm x 2.00mm), lens style (rectangle with flat top), and mounting type (through hole radial package)
• Environmental Specifications: Matching moisture sensitivity level (MSL 1 - Unlimited)

The primary differences are the increased millicandela rating (3.7mcd vs. 2.5mcd) and maximum height (7.50mm vs. 7.00mm), which represent performance enhancements and minor dimensional variations within acceptable substitution tolerances.

Parameter Comparison

Engineering Selection Recommendations

The LTL-433G is the appropriate substitute for the obsolete LTL-3231A. The substitute part maintains active product status with Lite-On Inc., ensuring continued availability and supply chain reliability. The LTL-433G provides ROHS3 compliance and REACH compliance status, meeting current regulatory requirements for electronic components in most markets. The electrical and optical parameters are identical, confirming direct functional equivalence. The minor increase in maximum height (0.50mm) and brightness (1.2mcd additional) represent performance improvements that do not compromise compatibility in standard through-hole PCB applications.

Frequently Asked Questions (FAQ)

Q: Can the LTL-433G be used as a direct replacement for the LTL-3231A in existing designs?

A: Yes. The LTL-433G is electrically and optically equivalent to the LTL-3231A. Both components share identical forward voltage (2.1V), test current (20mA), wavelength specifications (569nm dominant), lens dimensions (5.00mm x 2.00mm), and mounting type (through hole radial). The substitute part is suitable for direct PCB substitution.

Q: What are the key differences between these parts?

A: The LTL-433G has a higher millicandela rating (3.7mcd vs. 2.5mcd) and a maximum height of 7.50mm compared to 7.00mm for the LTL-3231A. The LTL-433G also carries ROHS3 and REACH compliance certifications. These differences represent performance enhancements and regulatory compliance improvements.

Q: Is the 0.50mm height difference significant for PCB layout?

A: The height difference is minor and typically does not impact standard through-hole PCB designs. However, applications with strict height constraints should verify clearance requirements during design review.

Q: Why is the LTL-3231A classified as obsolete?

A: The LTL-3231A is no longer in active production. The LTL-433G serves as the active equivalent, providing the same functional performance with improved availability and regulatory compliance.

Q: Are there any packaging differences between these parts?

A: The LTL-3231A is supplied in standard packaging, while the LTL-433G is supplied in bulk packaging. Both use the same radial package / case configuration suitable for through-hole mounting.