LTL-2211AT Equivalent & Substitute Parts

Part Overview

The LTL-2211AT is a red diffused 3mm through-hole LED manufactured by Lite-On Inc., designed for indication applications with a dominant wavelength of 657nm. This component is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. The part operates at a forward voltage of 2.1V with a test current of 20mA and provides a 180° viewing angle in a radial package configuration.

Substiute Parts

LTL-2211AT

Lite-On Inc.In Stock: 819LTL-2211AT Datasheet

Current PartRFQ

LTL-4291

Lite-On Inc.In Stock: 1142LTL-4291 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LTL-2211AT is determined by the following critical parameters:

• Color and Wavelength: Red spectrum LEDs with dominant wavelengths in the red range (621nm–657nm) are functionally equivalent for indication purposes
• Lens Transparency: Diffused lens maintains consistent light distribution characteristics
• Mounting Type: Through-hole radial package ensures mechanical compatibility with existing PCB layouts
• Voltage and Current Ratings: Forward voltage tolerance (2.0V–2.1V) and test current (20mA) define electrical interchangeability
• Physical Dimensions: 3mm lens size and similar height profiles ensure form-factor compatibility

The LTL-4291 qualifies as a direct substitute based on these parameters, despite variations in millicandela rating and viewing angle, as these are secondary performance characteristics that do not prevent functional substitution in indication applications.

Parameter Comparison

Engineering Selection Recommendations

The LTL-4291 is the qualified substitute for the obsolete LTL-2211AT. Selection should be based on the following factors:

Product Status: The LTL-4291 carries Active status, ensuring continued availability and manufacturing support, whereas the LTL-2211AT is obsolete and subject to discontinuation.

Compliance and Certifications: The LTL-4291 is RoHS3 Compliant and REACH Affected, meeting current regulatory requirements for electronic components in regulated markets.

Electrical Compatibility: Both parts operate within compatible voltage ranges (2.0V–2.1V forward voltage) and share identical test current specifications (20mA), ensuring direct electrical substitution without circuit redesign.

Physical Compatibility: Both parts feature 3mm through-hole radial packages with similar maximum heights (6.55mm vs. 7.20mm), permitting mechanical substitution in existing PCB designs.

Performance Variations: The LTL-4291 exhibits higher brightness (12.6mcd vs. 1.1mcd) and narrower viewing angle (40° vs. 180°). These differences must be evaluated against specific application requirements for indication visibility and light distribution.

Frequently Asked Questions (FAQ)

Q: Can the LTL-4291 be used as a direct replacement for the LTL-2211AT without circuit modifications?

A: Yes. Both parts share compatible forward voltage (2.0V–2.1V) and test current (20mA) specifications. No circuit modifications are required for electrical substitution. Physical compatibility is maintained through identical 3mm through-hole radial package configurations.

Q: What are the key differences between these two parts?

A: The primary differences are product status (Active vs. Obsolete), brightness (12.6mcd vs. 1.1mcd), viewing angle (40° vs. 180°), and dominant wavelength (621nm vs. 657nm). The LTL-4291 provides higher brightness and narrower light distribution, while the LTL-2211AT offers wider viewing angle and lower brightness.

Q: Does the narrower viewing angle of the LTL-4291 affect compatibility?

A: Viewing angle compatibility depends on application requirements. The LTL-4291's 40° viewing angle is suitable for directed indication applications. If the original design requires 180° omnidirectional visibility, the narrower angle may impact performance. Application-specific evaluation is necessary.

Q: Are there compliance or regulatory differences between these parts?

A: The LTL-4291 is certified as RoHS3 Compliant and REACH Affected, meeting current regulatory standards. The LTL-2211AT specifications do not include these certifications. For applications in regulated markets, the LTL-4291 is the compliant choice.

Q: What is the inventory status for these parts?

A: The LTL-2211AT has 799 pieces in stock (obsolete status). The LTL-4291 has 1065 pieces in stock with active product status, ensuring continued availability for production requirements.

Q: Can the higher brightness of the LTL-4291 cause issues in the original application?

A: The LTL-4291's higher brightness (12.6mcd vs. 1.1mcd) may require evaluation in light-sensitive applications or where specific brightness levels are critical. Circuit current limiting and application environment should be assessed to determine if brightness adjustment is necessary.