OVM4G LED Green Indicator - Equivalent & Substitute Parts

Part Overview

The OVM4G is a green LED indicator manufactured by TT Electronics/Optek Technology, designed for discrete indication applications with a dominant wavelength of 530nm. This component features a TO-46-2 metal can package with a domed lens and is rated at 6520 millicandelas. The OVM4G is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and production continuity.

Substiute Parts

OVM4G

TT Electronics/Optek TechnologyIn Stock: 1195OVM4G Datasheet

Current PartRFQ

333-2SUGC/H3/S400-A5

Everlight Electronics Co LtdIn Stock: 1210333-2SUGC/H3/S400-A5 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OVM4G is determined by the following critical parameters:

Wavelength Compatibility: Both the dominant wavelength (530nm) and peak wavelength must align with the original specification to maintain color consistency and optical performance in indication circuits.

Electrical Characteristics: Forward voltage (Vf) and test current define the LED's operating point. Variations in these parameters affect circuit design and current-limiting resistor selection.

Optical Output: Millicandela rating and viewing angle determine brightness and visibility characteristics. Substitutes must provide equivalent or superior light output within acceptable viewing geometry.

Physical Form Factor: Lens diameter, lens style, and overall height impact mechanical fit in PCB layouts and enclosure designs. Through-hole mounting type is maintained across substitutes.

Compliance Status: RoHS and REACH certifications are relevant for applications subject to regulatory requirements.

The substitute part 333-2SUGC/H3/S400-A5 (Everlight Electronics) meets the core functional requirements: green color, 530nm dominant wavelength, through-hole mounting, and comparable optical output (6300mcd versus 6520mcd).

Parameter Comparison

Engineering Selection Recommendations

The 333-2SUGC/H3/S400-A5 from Everlight Electronics is an active product suitable for replacing the obsolete OVM4G in new designs and production continuity scenarios. Key considerations:

Electrical Compatibility: The substitute operates at 3.4V forward voltage compared to the original 2.6V. Circuit designs must account for this 0.8V increase when calculating current-limiting resistor values. At the standard 20mA test current, this difference is manageable through resistor adjustment.

Optical Performance: The substitute delivers 6300mcd against the original 6520mcd, representing a 3.4% reduction in brightness. The viewing angle increases from 18° to 20°, providing slightly wider visibility. These differences are within acceptable tolerance for most indication applications.

Physical Integration: The substitute uses a standard 5mm round package with 8.90mm maximum height, compared to the original TO-46-2 metal can at 4.79mm height. PCB layout and mechanical clearance must be verified for the increased height and larger 5.00mm lens diameter.

Regulatory Compliance: The substitute is ROHS3 compliant, addressing modern regulatory requirements. Applications subject to RoHS mandates benefit from this upgrade.

Product Availability: The substitute is classified as active with confirmed inventory, ensuring long-term supply chain stability compared to the obsolete original.

Frequently Asked Questions (FAQ)

Q: Can the 333-2SUGC/H3/S400-A5 be used as a direct pin-for-pin replacement for the OVM4G?

A: No. While both are through-hole green LEDs with similar optical characteristics, the package types differ fundamentally. The OVM4G uses a TO-46-2 metal can configuration, while the substitute uses a standard 5mm round radial package. PCB footprints are not compatible without redesign. Additionally, the forward voltage differs (2.6V versus 3.4V), requiring circuit recalculation.

Q: What is the impact of the 0.8V forward voltage difference on circuit design?

A: The higher forward voltage of the substitute requires adjustment to current-limiting resistor values. Using Ohm's law (R = (Vsupply - Vf) / I), a higher Vf results in a lower required resistance for the same supply voltage and desired current. For example, with a 5V supply and 20mA target current, the original requires approximately 120Ω while the substitute requires approximately 80Ω. Verify resistor selection for your specific supply voltage.

Q: Is the 3.4% reduction in brightness (6300mcd versus 6520mcd) acceptable?

A: For most indication applications, this difference is imperceptible and acceptable. The substitute's slightly wider viewing angle (20° versus 18°) partially compensates for the modest brightness reduction. Applications with critical brightness requirements should conduct visual assessment under actual operating conditions.

Q: What are the mechanical constraints when switching from TO-46-2 to 5mm round package?

A: The substitute is taller (8.90mm versus 4.79mm) and has a larger lens diameter (5.00mm versus 4.63mm). Verify that PCB layout provides adequate clearance above the component and that the larger lens does not interfere with enclosure or adjacent components. The footprint pattern is completely different and requires PCB redesign.

Q: Does the ROHS3 compliance of the substitute affect compatibility?

A: ROHS3 compliance is a regulatory advantage with no negative technical impact. If your application or market requires RoHS compliance, the substitute meets this requirement while the original does not. This is a benefit for new designs and production continuity in regulated markets.

Q: Are there other substitute options beyond 333-2SUGC/H3/S400-A5?

A: The provided data identifies 333-2SUGC/H3/S400-A5 as the manufacturer-recommended substitute. Additional alternatives may exist in the market, but selection should follow the same parameter-matching criteria: green color, 530nm dominant wavelength, through-hole mounting, comparable millicandela rating, and compatible electrical characteristics for your circuit design.