LTL231 Equivalent & Substitute Parts

Part Overview

The LTL231 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 classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. The LTL231 features a 3.00mm diameter round domed lens with a forward voltage of 2.1V and operates at a test current of 20mA.

Substiute Parts

LTL231

Lite-On Inc.In Stock: 1146LTL231 Datasheet

Current PartRFQ

LTL-4231

Lite-On Inc.In Stock: 44261LTL-4231 Datasheet

MFR RecommendedRFQ

LTL-4231N

Lite-On Inc.In Stock: 10263LTL-4231N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LTL231 are qualified based on the following critical parameters that determine functional compatibility:

• Color and Wavelength: Both substitute parts maintain the green color specification with identical dominant (569nm) and peak (565nm) wavelengths
• Forward Voltage (Vf): All parts operate at 2.1V, ensuring compatibility with existing circuit designs
• Lens Transparency: Diffused lens characteristic is preserved across all substitutes
• Mounting Type: Through-hole radial configuration is maintained
• Manufacturer: All parts are manufactured by Lite-On Inc., ensuring consistent quality and reliability standards
• Moisture Sensitivity Level: MSL rating of 1 (Unlimited) is consistent across all parts

The substitute parts LTL-4231 and LTL-4231N are both active products with improved availability and compliance certifications, making them suitable replacements for the obsolete LTL231.

Parameter Comparison

Engineering Selection Recommendations

LTL-4231: This substitute is recommended for applications where the lower viewing angle of 40° is acceptable. The part is ROHS3 compliant and REACH affected. Higher millicandela rating (12.6mcd vs 8.7mcd) provides increased luminous intensity. Test current is reduced to 10mA, resulting in lower power consumption compared to the original LTL231.

LTL-4231N: This substitute is recommended for applications requiring a wider viewing angle of 60°, closer to the original LTL231 specification of 76°. The part is ROHS3 compliant and REACH unaffected, offering regulatory advantages in certain markets. Maximum height of 5.85mm is closer to the original 5.25mm specification. Test current is 10mA with the same 12.6mcd brightness rating.

Both substitutes are active products with significantly higher inventory availability compared to the obsolete LTL231, ensuring supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can LTL-4231 and LTL-4231N be used interchangeably with LTL231?

A: Both parts maintain the critical electrical parameters: green color, 569nm dominant wavelength, and 2.1V forward voltage. However, differences in viewing angle, height, and test current must be evaluated against specific application requirements. LTL-4231N provides a viewing angle closer to the original specification.

Q: What is the impact of the reduced test current (10mA vs 20mA) on circuit design?

A: The substitute parts operate at 10mA test current compared to the original 20mA. Circuit designs must be evaluated to ensure compatibility with this lower current specification. The forward voltage remains constant at 2.1V.

Q: How do the viewing angle differences affect application suitability?

A: The LTL231 has a 76° viewing angle. LTL-4231 provides 40°, while LTL-4231N provides 60°. Applications requiring wide-angle indication should prioritize LTL-4231N. Applications with directional viewing requirements may benefit from LTL-4231's narrower 40° angle.

Q: What are the height considerations for PCB layout?

A: LTL231 maximum height is 5.25mm. LTL-4231N is 5.85mm, and LTL-4231 is 6.55mm. PCB designs with height constraints should prioritize LTL-4231N for closest dimensional compatibility.

Q: Are there regulatory compliance differences between the substitutes?

A: Both substitutes are ROHS3 compliant. LTL-4231 is REACH affected, while LTL-4231N is REACH unaffected. Applications subject to REACH restrictions should specify LTL-4231N.

Q: What is the brightness difference between the original and substitutes?

A: The LTL231 has 8.7mcd brightness. Both substitutes provide 12.6mcd, representing approximately 45% higher luminous intensity. Applications sensitive to brightness levels should account for this increase.