TLDR4900 Equivalent & Substitute Parts

Part Overview

The TLDR4900 is a red LED indication component manufactured by Vishay Semiconductor Opto Division, designed for through-hole mounting applications. This 3mm T-1 package LED operates at 1.8V forward voltage with a 200mcd brightness rating and features a clear, domed lens for standard indication purposes. The component is Active status and fully compliant with RoHS3 and REACH regulations, making it suitable for current production environments. Substitute parts may be required due to inventory constraints, supply chain discontinuities, or specific application requirements that demand alternative electrical or optical characteristics.

Substiute Parts

TLDR4900

Vishay Semiconductor Opto DivisionIn Stock: 4627TLDR4900 Datasheet

Current PartRFQ

5219215F

DialightIn Stock: 20565219215F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TLDR4900 is determined by the following critical parameters:

Mechanical Compatibility: Lens size (3mm), mounting type (through hole), and package configuration (radial) must remain consistent to ensure physical fit within existing PCB layouts and mechanical assemblies.

Optical Characteristics: Color (red spectrum) and lens transparency determine visual indication properties. The TLDR4900 features a clear lens with 200mcd brightness and 32° viewing angle, optimized for direct line-of-sight indication.

Electrical Parameters: Forward voltage (1.8V) and test current (20mA) define circuit compatibility. Substitutes with significantly different Vf ratings require circuit redesign or current-limiting adjustments.

Regulatory Compliance: RoHS3 and REACH compliance status must be maintained for production use in regulated markets.

The substitute part 5219215F shares the same mechanical form factor (3mm through-hole radial package) and red color specification, enabling physical interchangeability. However, critical electrical and optical differences exist that must be evaluated for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Both the TLDR4900 and 5219215F maintain Active product status and full compliance with RoHS3 and REACH regulations, confirming their suitability for current production environments.

Direct Substitution Considerations:

The 5219215F differs from the TLDR4900 in four critical parameters: forward voltage (7.5V vs. 1.8V), brightness (29mcd vs. 200mcd), lens transparency (diffused vs. clear), and viewing angle (60° vs. 32°). These differences require circuit-level evaluation before implementation.

The forward voltage differential of 5.7V necessitates circuit redesign if the 5219215F is selected as a substitute. Existing current-limiting resistor values calculated for 1.8V operation will not provide appropriate current regulation at 7.5V, potentially resulting in component failure or inadequate brightness.

The brightness reduction from 200mcd to 29mcd represents a 85.5% decrease in luminous intensity. Applications requiring high-visibility indication may not achieve design specifications with the substitute part.

The diffused lens of the 5219215F provides a wider viewing angle (60° vs. 32°), distributing light over a broader spatial range at reduced intensity. This characteristic suits applications requiring omnidirectional visibility but may not meet requirements for focused, high-intensity indication.

Both components share identical mechanical form factors (3mm through-hole radial package) and regulatory compliance status, confirming physical and regulatory interchangeability within the constraints of the electrical and optical differences noted above.

Frequently Asked Questions (FAQ)

Q: Can the 5219215F be used as a direct drop-in replacement for the TLDR4900?

A: Physical and regulatory compatibility exists due to identical 3mm through-hole radial packaging and RoHS3/REACH compliance. However, electrical circuit redesign is required due to the 5.7V forward voltage difference. The substitute part operates at 7.5V compared to the original 1.8V specification, necessitating recalculation of current-limiting resistor values to prevent component damage or malfunction.

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

A: The TLDR4900 provides 200mcd brightness, while the 5219215F delivers 29mcd. This represents an 85.5% reduction in luminous intensity. Applications requiring high-visibility indication should evaluate whether the reduced brightness of the substitute part meets functional requirements.

Q: How do the lens characteristics differ?

A: The TLDR4900 features a clear lens with a 32° viewing angle, optimized for direct line-of-sight indication with concentrated light output. The 5219215F uses a diffused lens with a 60° viewing angle, distributing light over a wider spatial range. The diffused lens reduces peak brightness but increases visibility from off-axis positions.

Q: Are both parts compliant with current regulations?

A: Yes. Both the TLDR4900 and 5219215F are RoHS3 compliant and REACH unaffected, confirming their eligibility for production use in regulated markets.

Q: What wavelength differences exist between these components?

A: The TLDR4900 has a dominant wavelength of 648nm (peak 650nm), while the 5219215F operates at 625nm dominant (peak 635nm). Both fall within the red spectrum, but the TLDR4900 produces a slightly more orange-red appearance compared to the deeper red of the 5219215F.

Q: Are the physical dimensions compatible?

A: Both components use 3mm through-hole radial packages with compatible form factors. The TLDR4900 has a maximum height of 6.40mm, while the 5219215F measures 5.86mm maximum height. This 0.54mm difference is negligible for most PCB layout applications and does not affect mechanical interchangeability.