TLDR4901 Equivalent & Substitute Parts

Part Overview

The TLDR4901 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 131.5mcd brightness rating and features a clear, domed lens for standard indication purposes. The product is currently active and widely available in inventory. Substitute parts may be required due to supply constraints, design revisions, or specific application requirements that demand alternative electrical or optical characteristics.

Substiute Parts

TLDR4901

Vishay Semiconductor Opto DivisionIn Stock: 794TLDR4901 Datasheet

Current PartRFQ

5219215F

DialightIn Stock: 20565219215F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The TLDR4901 has one identified substitute: the 5219215F manufactured by Dialight. Substitution eligibility is determined by the following parameters:

• Mechanical Compatibility: Both parts share the same 3mm through-hole package format with radial configuration, ensuring identical PCB footprint and mounting requirements.
• Color Category: Both are red LEDs, maintaining consistent visual indication functionality.
• Electrical Tolerance: While forward voltage differs (1.8V vs 7.5V), both operate within discrete LED application ranges and are suitable for standard indication circuits with appropriate current-limiting resistor design.
• Optical Characteristics: Both feature domed lens styles and operate in the red spectrum (648nm dominant vs 625nm dominant), with acceptable wavelength variation for general indication purposes.
• Regulatory Compliance: Both parts maintain ROHS3 compliance, REACH unaffected status, and identical moisture sensitivity levels, ensuring equivalent environmental and regulatory standing.

Parameter Comparison

Engineering Selection Recommendations

Both the TLDR4901 and 5219215F are active products with equivalent regulatory compliance status. Selection between these parts should be based on application-specific requirements:

The TLDR4901 provides higher brightness output (131.5mcd) with lower forward voltage (1.8V) and a narrower viewing angle (32°), suitable for applications requiring concentrated light intensity and lower power consumption.

The 5219215F offers wider light distribution (60° viewing angle) with diffused lens characteristics, lower brightness output (29mcd), and higher forward voltage (7.5V), appropriate for applications requiring broader illumination coverage.

Both parts maintain identical moisture sensitivity levels and regulatory compliance certifications, ensuring equivalent reliability and environmental performance in standard through-hole applications.

Frequently Asked Questions (FAQ)

Q: Can the 5219215F directly replace the TLDR4901 without circuit modifications?

A: Direct replacement requires circuit evaluation. The 5219215F operates at 7.5V forward voltage compared to the TLDR4901's 1.8V, necessitating recalculation of current-limiting resistor values to maintain proper LED current levels. The current-limiting resistor must be adjusted according to the supply voltage and desired operating current.

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

A: The TLDR4901 features a clear lens with 32° viewing angle and 131.5mcd brightness, providing concentrated, directional illumination. The 5219215F has a diffused lens with 60° viewing angle and 29mcd brightness, distributing light over a wider area with reduced intensity. Lens transparency and viewing angle differences affect light distribution patterns in the application.

Q: Are both parts suitable for the same PCB layout?

A: Yes. Both parts use identical 3mm through-hole radial packages with compatible mechanical dimensions, allowing use of the same PCB footprint. However, the TLDR4901 has a maximum height of 6.40mm while the 5219215F measures 5.86mm maximum height, a difference that does not affect standard through-hole mounting compatibility.

Q: Do these parts have equivalent environmental compliance?

A: Yes. Both the TLDR4901 and 5219215F are ROHS3 compliant, REACH unaffected, and maintain MSL Level 1 (Unlimited) moisture sensitivity ratings, ensuring equivalent environmental and regulatory standing for standard applications.

Q: What wavelength differences exist between these parts?

A: The TLDR4901 has a dominant wavelength of 648nm (peak 650nm), while the 5219215F operates at 625nm dominant (peak 635nm). Both fall within the red spectrum range and are visually indistinguishable for standard indication purposes, though the TLDR4901 appears slightly more orange-red while the 5219215F appears more pure red.