OVM4RTX Equivalent & Substitute Parts

Part Overview

The OVM4RTX is a red LED indication component manufactured by TT Electronics/Optek Technology, featuring a 624nm dominant wavelength with 3300mcd brightness rating in a TO-46-2 through-hole package. This part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity. The component operates at 1.8V forward voltage with a 20mA test current and provides an 18° viewing angle in a clear, domed lens configuration.

Substiute Parts

OVM4RTX

TT Electronics/Optek TechnologyIn Stock: 940OVM4RTX Datasheet

Current PartRFQ

5219820F

DialightIn Stock: 20005219820F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The 5219820F from Dialight qualifies as a functional substitute based on the following alignment criteria:

Color & Wavelength Compatibility: Both components emit red light in the 624-630nm dominant wavelength range, meeting red indication requirements across standard applications.

Electrical Compatibility: Forward voltage differs slightly (OVM4RTX: 1.8V vs. 5219820F: 2V) within acceptable tolerance for most LED circuit designs using current-limiting resistors. Both operate at 20mA test current.

Optical Performance: The 5219820F provides higher brightness (3700mcd vs. 3300mcd) and wider viewing angle (30° vs. 18°), making it suitable for applications requiring equal or greater visibility.

Mechanical Compatibility: Both components use through-hole mounting. The 5219820F uses a 5mm radial package versus the TO-46-2 metal can, requiring PCB footprint redesign but maintaining functional equivalence.

Product Status & Compliance: The 5219820F is active production status with ROHS3 compliance, addressing the obsolescence and compliance limitations of the OVM4RTX.

Parameter Comparison

Engineering Selection Recommendations

For Obsolescence Resolution: The 5219820F is the recommended substitute to address the OVM4RTX obsolete status. Active production availability ensures long-term supply chain continuity.

For Compliance Requirements: If RoHS3 compliance is mandated, the 5219820F satisfies this requirement, whereas the OVM4RTX does not.

For Circuit Integration: The 0.2V forward voltage increase (1.8V to 2V) requires recalculation of current-limiting resistor values. Use the formula: R = (Vsupply - Vf) / Iled. Verify the new resistor value maintains acceptable brightness and power dissipation within circuit specifications.

For Mechanical Integration: PCB footprint redesign is required due to package change from TO-46-2 metal can to 5mm radial. Verify available PCB space accommodates the increased height (8.91mm vs. 4.79mm).

For Optical Performance: The 5219820F provides superior brightness (3700mcd vs. 3300mcd) and wider viewing angle (30° vs. 18°), making it suitable for applications requiring equal or greater visibility without additional circuit modifications.

Frequently Asked Questions (FAQ)

Q: Can the 5219820F directly replace the OVM4RTX without circuit modifications?

A: No. The package form factor differs (TO-46-2 metal can vs. 5mm radial), requiring PCB footprint redesign. The forward voltage increase from 1.8V to 2V necessitates recalculation of the current-limiting resistor to maintain proper LED current.

Q: What is the impact of the 0.2V forward voltage difference?

A: The voltage difference is manageable through resistor adjustment. Recalculate the current-limiting resistor using Ohm's law with the new 2V forward voltage. This maintains the 20mA test current and proper LED operation.

Q: Does the increased height of the 5219820F present mechanical constraints?

A: The 5219820F height is 8.91mm compared to 4.79mm for the OVM4RTX. Verify available vertical clearance on the PCB and within the enclosure before implementation.

Q: Are the wavelength differences between 624nm and 630nm significant?

A: Both wavelengths fall within the red spectrum and are visually indistinguishable for indication applications. The 630nm dominant wavelength of the 5219820F is standard for red LEDs.

Q: What are the compliance advantages of the 5219820F?

A: The 5219820F is ROHS3 compliant and active production status, addressing both environmental regulatory requirements and supply chain continuity concerns associated with the obsolete OVM4RTX.

Q: Does the higher brightness of the 5219820F affect circuit design?

A: The 3700mcd rating of the 5219820F versus 3300mcd of the OVM4RTX provides improved visibility without requiring circuit modifications beyond resistor adjustment for the forward voltage difference.