OVM4B LED Blue Clear TO-46 Equivalent & Substitute Parts

Part Overview

The OVM4B is a blue LED indication component manufactured by TT Electronics / Optek Technology, featuring a 465nm dominant wavelength and 2260mcd brightness rating in a TO-46-2 through-hole package. This part is classified as obsolete, making substitute identification essential for ongoing production and maintenance applications. The OVM4B delivers 2.6V forward voltage at 20mA test current with an 18° viewing angle and clear domed lens in a 4.63mm diameter form factor.

Substiute Parts

OVM4B

TT Electronics / Optek TechnologyIn Stock: 1065OVM4B Datasheet

Current PartRFQ

C503B-BCN-CU0W0452-030

CreeLED, Inc.In Stock: 1028C503B-BCN-CU0W0452-030 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the OVM4B is determined by the following critical parameters:

• Color specification (Blue)
• Wavelength compatibility (dominant wavelength within acceptable range for blue LEDs: 465-470nm)
• Lens configuration (clear, colorless, domed top)
• Mounting type (through-hole)
• Forward voltage tolerance (2.6V-3.2V acceptable for most applications)
• Brightness class (millicandela rating 2260mcd or higher)
• Compliance certifications (RoHS and REACH status)
• Moisture sensitivity level (MSL 1)

The C503B-BCN-CU0W0452-030 qualifies as a substitute based on matching color, lens transparency, mounting type, and compliance requirements. While the substitute exhibits different physical dimensions (5mm lens diameter vs. 4.63mm) and higher forward voltage (3.2V vs. 2.6V), these differences are within acceptable engineering tolerances for indication LED applications where the primary functional requirements are color, wavelength, and brightness.

Parameter Comparison

Engineering Selection Recommendations

The C503B-BCN-CU0W0452-030 is suitable as a substitute for the obsolete OVM4B based on the following factors:

• Both components maintain RoHS and REACH compliance, ensuring regulatory alignment for new designs and production continuity.
• The substitute is classified as Active product status, providing assured long-term availability and supply chain stability.
• Color and lens transparency specifications are identical, preserving visual indication functionality.
• Wavelength values (465nm vs. 470nm) fall within the standard blue LED spectrum and are functionally equivalent for indication applications.
• Both components carry MSL 1 rating, indicating no moisture sensitivity constraints during storage and handling.
• The substitute delivers higher brightness (2850mcd vs. 2260mcd), providing improved visibility margin in indication circuits.

Circuit design modifications are required to accommodate the 0.6V forward voltage increase (2.6V to 3.2V). Current-limiting resistor values must be recalculated to maintain 20mA test current operation. Physical layout adjustments are necessary due to the 5mm lens diameter (vs. 4.63mm) and increased height (10.10mm vs. 4.79mm).

Frequently Asked Questions (FAQ)

Q: Can the C503B-BCN-CU0W0452-030 directly replace the OVM4B without circuit modifications?

A: No. The substitute requires circuit redesign due to the 0.6V forward voltage difference. Current-limiting resistor values must be recalculated to maintain proper LED operation at 20mA test current. Additionally, physical layout changes are necessary to accommodate the larger 5mm lens diameter and increased component height.

Q: Are the wavelength differences between 465nm and 470nm significant for indication applications?

A: Both wavelengths fall within the standard blue LED spectrum and are functionally equivalent for visual indication purposes. The 5nm difference is not perceptible to human vision in indication applications.

Q: What are the key compliance considerations when substituting these components?

A: Both the OVM4B and C503B-BCN-CU0W0452-030 maintain RoHS and REACH compliance. The substitute carries RoHS Compliant status (vs. RoHS3 for the original), which is acceptable for new designs. Both components have MSL 1 rating with unlimited moisture sensitivity tolerance.

Q: Why is the viewing angle different between these components?

A: The OVM4B features an 18° viewing angle while the substitute provides 30°. This difference results from the larger 5mm lens diameter in the substitute design. The wider viewing angle may affect circuit board layout and visual indication coverage in the application.

Q: Is the higher brightness rating of the substitute a concern?

A: The C503B-BCN-CU0W0452-030 delivers 2850mcd compared to the OVM4B's 2260mcd. This 26% brightness increase provides improved visibility margin and is generally beneficial for indication applications. However, if the original design relied on specific brightness levels for optical balance, the substitute's higher output should be verified in the target application.

Q: What packaging differences exist between these components?

A: The OVM4B uses TO-46-2 Lens Top Metal Can packaging, while the substitute is supplied in Tape & Box (TB) packaging. Both are through-hole components suitable for PCB assembly, but tape and reel packaging may require different handling procedures in automated assembly environments.