VLMB3140-GS08 Equivalent & Substitute Parts

Part Overview

The VLMB3140-GS08 is a blue 470nm LED indication component manufactured by Vishay Semiconductor Opto Division, configured as a discrete 3V 2-SMD J-Lead surface mount device. This part is classified as obsolete, making substitute components necessary for ongoing production and maintenance applications. The component delivers 100mcd luminous intensity with a 120° viewing angle and operates at 20mA test current.

Substiute Parts

VLMB3140-GS08

Vishay Semiconductor Opto DivisionIn Stock: 897VLMB3140-GS08 Datasheet

Current PartRFQ

67-21SUBC/S400-X9/TR8

Everlight Electronics Co LtdIn Stock: 111167-21SUBC/S400-X9/TR8 Datasheet

MFR RecommendedRFQ

QTLP670CBTR

Fairchild SemiconductorIn Stock: 16138QTLP670CBTR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute components for the VLMB3140-GS08 are identified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

• Color: Blue
• Wavelength - Dominant: 470nm range
• Viewing Angle: 120°
• Lens Size: 2.40mm Dia
• Lens Style: Round with Flat Top
• Lens Transparency: Clear
• Mounting Type: Surface Mount
• Current - Test: 20mA

Secondary Considerations:

• Voltage - Forward (Vf): Tolerance range around 3V nominal
• Millicandela Rating: Functional brightness within application requirements
• Package compatibility: Surface mount configurations

The identified substitutes meet the core optical and electrical parameters while accommodating variations in package form factor and forward voltage specifications.

Parameter Comparison

Engineering Selection Recommendations

67-21SUBC/S400-X9/TR8 (Everlight Electronics Co Ltd)

This substitute is classified as active product status with Tape & Reel packaging. The component maintains the 470nm dominant wavelength and 120° viewing angle specifications. Forward voltage is 4.6V, representing a 0.5V increase from the original specification. Millicandela rating of 135mcd exceeds the original 100mcd. The 1411 (3528 Metric) package form factor differs from the original 2-SMD J-Lead configuration, requiring PCB layout verification. Height is reduced to 0.85mm maximum.

QTLP670CBTR (Fairchild Semiconductor)

This substitute is classified as active product status with bulk packaging. The component maintains the 120° viewing angle and 2.40mm lens diameter. Dominant wavelength is 465nm, within the blue spectrum range. Forward voltage is 3.8V, representing a 0.8V increase from the original specification. Millicandela rating of 30mcd is significantly lower than the original 100mcd, indicating reduced luminous intensity. The 2-PLCC package matches the original package type. Height is increased to 2.10mm maximum.

Frequently Asked Questions (FAQ)

Q: Can the 67-21SUBC/S400-X9/TR8 be used as a direct replacement for the VLMB3140-GS08?

A: The 67-21SUBC/S400-X9/TR8 maintains optical compatibility with matching wavelength and viewing angle specifications. However, the package form factor differs (1411 versus 2-SMD J-Lead), requiring PCB footprint modification. Forward voltage increases from 3V to 4.6V, necessitating circuit design review for current-limiting resistor adjustment.

Q: What are the implications of the forward voltage differences?

A: The VLMB3140-GS08 operates at 3V forward voltage. The 67-21SUBC/S400-X9/TR8 requires 4.6V, and the QTLP670CBTR requires 3.8V. These differences affect the series resistor calculation in current-limiting circuits. Higher forward voltages reduce the voltage drop across the series resistor, potentially requiring resistor value adjustment to maintain 20mA test current.

Q: How do the millicandela ratings affect substitution decisions?

A: The VLMB3140-GS08 provides 100mcd luminous intensity. The 67-21SUBC/S400-X9/TR8 provides 135mcd, offering increased brightness. The QTLP670CBTR provides only 30mcd, significantly reduced brightness. Application requirements determine whether increased or decreased brightness is acceptable.

Q: Are there package compatibility concerns?

A: Yes. The VLMB3140-GS08 uses a 2-SMD J-Lead package (3.00mm L x 2.80mm W x 1.85mm H). The 67-21SUBC/S400-X9/TR8 uses a 1411 (3528 Metric) package (4.60mm L x 2.80mm W x 0.85mm H). The QTLP670CBTR uses a 2-PLCC package (3.20mm L x 2.80mm W x 2.10mm H). PCB footprint and height clearance must be verified for each substitute.

Q: What is the significance of product status classifications?

A: The VLMB3140-GS08 is classified as obsolete, indicating discontinued manufacturing. Both substitute parts are classified as active, ensuring ongoing availability. Active status provides supply chain continuity for production and maintenance applications.