VLMD3100-GS18 Equivalent & Substitute Parts

Part Overview

The VLMD3100-GS18 is a red 648nm LED indication component manufactured by Vishay Semiconductor Opto Division. This surface mount 2-SMD, J-Lead package operates at 1.8V forward voltage with a 10mA test current and delivers 11.2mcd luminous intensity. The component is Active status and ROHS3 compliant, making it suitable for modern electronic applications requiring red LED indication in compact form factors.

Substitute parts become necessary when the primary part number experiences inventory constraints, supply chain disruptions, or when design flexibility permits alternative wavelength or brightness specifications within acceptable operational parameters.

Substiute Parts

VLMD3100-GS18

Vishay Semiconductor Opto DivisionIn Stock: 970VLMD3100-GS18 Datasheet

Current PartRFQ

VLMD3100-GS08

Vishay Semiconductor Opto DivisionIn Stock: 25863VLMD3100-GS08 Datasheet

Parametric EquivalentRFQ

VLMS30K1L2-GS08

Vishay Semiconductor Opto DivisionIn Stock: 38255VLMS30K1L2-GS08 Datasheet

Parametric EquivalentRFQ

VLMS31K1L2-GS08

Vishay Semiconductor Opto DivisionIn Stock: 9222VLMS31K1L2-GS08 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the VLMD3100-GS18 is determined by the following critical parameters:

Primary Substitution Criteria:

• Package type: 2-SMD, J-Lead (2-PLCC supplier device package)
• Physical dimensions: 3.00mm L x 2.80mm W, 1.85mm max height
• Mounting type: Surface Mount
• Lens style: Round with Flat Top, 2.40mm diameter
• Viewing angle: 120°
• Color: Red
• RoHS compliance: ROHS3 Compliant
• Product status: Active

Secondary Variation Parameters (Allowable Differences):

• Wavelength - Dominant: 630nm to 648nm range
• Wavelength - Peak: 635nm to 650nm range
• Voltage - Forward (Vf): 1.8V to 1.9V range
• Current - Test: 2mA to 10mA range
• Millicandela Rating: 11.2mcd to 13mcd range

The VLMD3100-GS08 is a direct parametric equivalent with identical specifications except for packaging designation. VLMS30K1L2-GS08 and VLMS31K1L2-GS08 are functional equivalents with acceptable wavelength and brightness variations within the red LED spectrum.

Parameter Comparison

Engineering Selection Recommendations

VLMD3100-GS08: This part is the primary substitute for VLMD3100-GS18. It maintains identical electrical and optical specifications with only a packaging designation difference. Both parts are Active status, ROHS3 compliant, and carry equivalent MSL ratings. Selection of this substitute introduces no design risk and is suitable for direct replacement in existing designs.

VLMS30K1L2-GS08: This substitute operates at 630nm dominant wavelength versus the 648nm of the primary part, representing a shift toward the orange-red spectrum. The forward voltage remains at 1.8V, but the test current is reduced to 2mA with increased brightness at 13mcd. This part is suitable for applications where lower current draw is beneficial and the wavelength shift is acceptable. Active status and ROHS3 compliance are maintained.

VLMS31K1L2-GS08: This substitute operates at 630nm dominant wavelength with a forward voltage of 1.9V and test current of 10mA, delivering 13mcd brightness. The 0.1V increase in forward voltage requires circuit verification to ensure adequate supply margin. Active status and ROHS3 compliance are maintained. This part is suitable for applications tolerant of the wavelength shift and forward voltage increase.

All substitute parts maintain identical physical dimensions, package type, and mounting characteristics, ensuring PCB layout compatibility without redesign.

Frequently Asked Questions (FAQ)

Q: Can VLMD3100-GS08 be used as a direct replacement for VLMD3100-GS18?

A: Yes. VLMD3100-GS08 is a direct parametric equivalent with identical electrical and optical specifications. The packaging designation difference does not affect functional performance or PCB compatibility.

Q: What is the difference between VLMD3100-GS18 and VLMD3100-GS08?

A: The primary difference is the packaging designation suffix (GS18 versus GS08). Both parts share identical specifications for wavelength, forward voltage, test current, brightness, and physical dimensions. The suffix typically indicates different tape reel configurations or supplier packaging variants.

Q: Can VLMS30K1L2-GS08 replace VLMD3100-GS18 in my design?

A: VLMS30K1L2-GS08 is functionally compatible if your application tolerates a wavelength shift from 648nm to 630nm (orange-red spectrum) and can operate with reduced test current of 2mA while accepting increased brightness of 13mcd. Forward voltage remains at 1.8V. Physical dimensions and package type are identical.

Q: What is the impact of using VLMS31K1L2-GS08 instead of VLMD3100-GS18?

A: VLMS31K1L2-GS08 introduces three parameter variations: wavelength shifts to 630nm, forward voltage increases to 1.9V, and brightness increases to 13mcd. The 0.1V forward voltage increase requires verification that your circuit supply provides adequate margin. The wavelength and brightness changes are acceptable if your application does not require the specific 648nm wavelength of the primary part.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. VLMD3100-GS08, VLMS30K1L2-GS08, and VLMS31K1L2-GS08 are all ROHS3 compliant with identical MSL ratings of 2A (4 Weeks).

Q: Do the substitute parts have the same physical dimensions as VLMD3100-GS18?

A: Yes. All substitute parts maintain identical dimensions of 3.00mm L x 2.80mm W with 1.85mm maximum height, 2.40mm diameter lens, and 2-SMD J-Lead package configuration. No PCB layout modifications are required.

Q: Which substitute part should I select if inventory of VLMD3100-GS18 is unavailable?

A: VLMD3100-GS08 is the recommended first choice due to identical specifications. If VLMD3100-GS08 is also unavailable, VLMS30K1L2-GS08 or VLMS31K1L2-GS08 are acceptable alternatives provided your circuit design accommodates the wavelength, brightness, and forward voltage variations documented in the parameter comparison table.