LTL-33221AA Equivalent & Substitute Parts

Part Overview

The LTL-33221AA is a red diffused through-hole LED manufactured by Lite-On Inc., designed for discrete indication applications. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance requirements. The component features a 623nm dominant wavelength with 5.6mcd brightness rating and is rated for 2V forward voltage at 20mA test current.

Substiute Parts

LTL-33221AA

Lite-On Inc.In Stock: 975LTL-33221AA Datasheet

Current PartRFQ

LTL-433P

Lite-On Inc.In Stock: 801LTL-433P Datasheet

MFR RecommendedRFQ

SSL-LX4673ID-LA20

Lumex Opto/Components Inc.In Stock: 39619SSL-LX4673ID-LA20 Datasheet

MFR RecommendedRFQ

WP1043ID

KingbrightIn Stock: 1778WP1043ID Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LTL-33221AA are qualified based on the following criteria:

Primary Compatibility Parameters:

• Color: Red
• Lens Transparency: Diffused
• Mounting Type: Through Hole
• Package / Case: Radial
• Voltage - Forward (Vf): 2V nominal (±0.1V tolerance acceptable)
• Viewing Angle: 100° or greater
• Lens Style: Rectangle with Flat Top

The three qualified substitutes meet these core electrical and mechanical requirements. Variations in millicandela rating, exact wavelength, and test current are within acceptable ranges for indication applications where the primary function is visual status signaling rather than precision light measurement.

Parameter Comparison

Engineering Selection Recommendations

SSL-LX4673ID-LA20 (Lumex Opto/Components Inc.): This substitute provides the closest electrical match with identical 2V forward voltage and 20mA test current. It maintains 100° viewing angle and 635nm peak wavelength alignment. The part is ROHS3 compliant and carries MSL 1 rating, matching the original part's moisture sensitivity classification. High inventory availability (39,559 pcs) supports production continuity.

WP1043ID (Kingbright): This substitute operates at 2V with higher test current (30mA) and maintains 100° viewing angle. Peak wavelength of 625nm is within the red spectrum range. ROHS3 compliance and MSL 1 rating are present. The diffused, tinted lens provides visual characteristics suitable for indication applications.

LTL-433P (Lite-On Inc.): This substitute maintains manufacturer continuity as a Lite-On product. Forward voltage is 2.1V with reduced test current (10mA) and expanded 140° viewing angle. Peak wavelength shifts to 697nm (deeper red). ROHS3 compliance status is not specified. MSL 2A rating requires controlled storage conditions (4-week limit).

Frequently Asked Questions (FAQ)

Q: Can LTL-433P be used as a direct replacement for LTL-33221AA?

A: LTL-433P is electrically compatible with forward voltage of 2.1V (compared to 2V nominal) and operates at reduced test current (10mA vs. 20mA). The wider viewing angle (140° vs. 100°) and longer wavelength (697nm vs. 635nm) represent functional differences. Compatibility depends on circuit design tolerance for voltage variation and application requirements for brightness and viewing angle.

Q: What are the key differences between SSL-LX4673ID-LA20 and WP1043ID?

A: SSL-LX4673ID-LA20 matches the original part's 20mA test current, while WP1043ID requires 30mA. Both maintain 2V forward voltage and 100° viewing angle. Peak wavelengths differ slightly (635nm vs. 625nm). SSL-LX4673ID-LA20 offers closer electrical alignment to the original specification.

Q: Are all substitutes ROHS3 compliant?

A: SSL-LX4673ID-LA20 and WP1043ID are explicitly ROHS3 compliant. LTL-433P RoHS status is not specified in the provided data. Verify compliance requirements with your procurement specifications before selection.

Q: What is the impact of MSL rating differences?

A: LTL-33221AA and SSL-LX4673ID-LA20 carry MSL 1 (unlimited shelf life). WP1043ID also carries MSL 1. LTL-433P carries MSL 2A, requiring storage at controlled humidity for a maximum of 4 weeks before soldering. This affects inventory management and supply chain handling procedures.

Q: Can these parts be used interchangeably in existing PCB designs?

A: All substitutes share identical through-hole radial package configuration and rectangle with flat-top lens style, supporting direct PCB footprint compatibility. Electrical parameter variations (forward voltage, test current, wavelength) require circuit design verification to confirm functional equivalence in your specific application.