LTL-221 Equivalent & Substitute Parts

Part Overview

The LTL-221 is a red diffused T-1 through-hole LED manufactured by Lite-On Inc., designed for indication applications with a 623nm dominant wavelength and 2V forward voltage. This component is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing production, maintenance, and design continuity. Substitute parts must maintain compatibility across electrical characteristics, mechanical form factor, and optical performance within the specified tolerance ranges.

Substiute Parts

LTL-221

Lite-On Inc.In Stock: 950LTL-221 Datasheet

Current PartRFQ

MV5777C

onsemiIn Stock: 655MV5777C Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LTL-221 is determined by strict adherence to the following parameters:

Critical Parameters (Must Match):

• Color: Red
• Lens Transparency: Diffused
• Lens Size: 3.00mm diameter (T-1 standard)
• Voltage - Forward (Vf): 2V nominal
• Current - Test: 20mA
• Mounting Type: Through Hole
• Package / Case: Radial
• Supplier Device Package: T-1

Important Parameters (Acceptable Variation Within Limits):

• Height (Max): 5.25mm nominal; substitute height must not exceed PCB clearance requirements
• Wavelength - Peak: 635nm (red spectrum range)
• Millicandela Rating: 5.6mcd nominal; substitutes with higher brightness remain functionally compatible for indication applications

The MV5777C manufactured by onsemi meets all critical parameter requirements and is classified as a manufacturer-recommended substitute.

Parameter Comparison

Engineering Selection Recommendations

The MV5777C is a direct substitute for the LTL-221 based on electrical and mechanical compatibility. Both components share identical forward voltage, test current, package configuration, and mounting type. The MV5777C exhibits a wider viewing angle (140° versus 76°) and higher luminous intensity (7mcd versus 5.6mcd), both of which are acceptable variations for indication LED applications and do not compromise circuit functionality.

Both parts are classified as obsolete. Compliance certifications (ECCN: EAR99, HTSUS: 8541.41.0000, MSL: 1) are identical, ensuring regulatory and supply chain compatibility.

Frequently Asked Questions (FAQ)

Q: Can the MV5777C replace the LTL-221 in existing designs? A: Yes. The MV5777C meets all critical electrical and mechanical parameters. Forward voltage, test current, package type, and mounting configuration are identical. The component will function as a direct replacement in through-hole PCB applications.

Q: What is the difference in viewing angle between these parts? A: The LTL-221 has a 76° viewing angle, while the MV5777C has a 140° viewing angle. The wider angle of the MV5777C provides greater light distribution and does not negatively impact indication applications.

Q: Does the higher brightness of the MV5777C (7mcd vs. 5.6mcd) affect circuit design? A: No. The higher luminous intensity of the MV5777C is compatible with existing circuit designs. If brightness reduction is required, series resistor values can be adjusted to maintain the same 20mA test current.

Q: Are both parts still in production? A: Both the LTL-221 and MV5777C are classified as obsolete. Inventory availability should be verified with authorized distributors before design implementation.

Q: What are the physical dimensions compatibility considerations? A: Both parts use the T-1 package with 3mm lens diameter and nearly identical maximum heights (5.25mm vs. 5.20mm). They are mechanically interchangeable in standard through-hole PCB layouts.

Q: Are there any compliance or regulatory differences? A: No. Both parts share identical ECCN (EAR99), HTSUS code (8541.41.0000), and MSL rating (1 - Unlimited), ensuring equivalent compliance status.