VLMB31K2L2-3-GS18 Equivalent & Substitute Parts

Part Overview

The VLMB31K2L2-3-GS18 is a blue LED indication component manufactured by Vishay Semiconductor Opto Division in a 2-PLCC surface mount package. This part is classified as obsolete, necessitating identification of equivalent substitute components for ongoing design support and procurement. The VLMB31 series delivers blue light output at 466nm dominant wavelength with 10.5mcd intensity in a compact 3.00mm × 2.80mm footprint suitable for indicator applications requiring clear lens optics and 120° viewing angle.

Substiute Parts

VLMB31K2L2-3-GS18

Vishay Semiconductor Opto DivisionIn Stock: 777VLMB31K2L2-3-GS18 Datasheet

Current PartRFQ

5973601207F

DialightIn Stock: 18125973601207F Datasheet

SimilarRFQ

5973601207F

DialightIn Stock: 18125973601207F Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the VLMB31K2L2-3-GS18 is determined by strict alignment of the following critical parameters:

Package Compatibility: Both the main part and substitute must utilize the 2-PLCC surface mount package to ensure mechanical fit and PCB assembly compatibility.

Optical Characteristics: Color (blue), lens transparency (clear), and lens style (round with flat top) must match to maintain visual indication consistency and optical performance in the application.

Electrical Parameters: Forward voltage (Vf), test current (10mA), and millicandela rating establish the brightness and power consumption profile. Substitutes must operate within acceptable tolerances of these values to function in existing circuit designs without modification.

Wavelength Specification: Peak wavelength at 428nm and dominant wavelength in the blue spectrum (466nm range) define the color perception and must be preserved in substitute selection.

Viewing Angle: The 120° viewing angle specification must be maintained to ensure consistent visibility across the intended application environment.

Regulatory Compliance: RoHS3 compliance and REACH unaffected status are mandatory for substitutes to meet current environmental and regulatory requirements.

Parameter Comparison

Engineering Selection Recommendations

The Dialight 5973601207F serves as a functional substitute for the VLMB31K2L2-3-GS18 based on matching package type (2-PLCC), color specification (blue), optical properties (clear lens, round with flat top, 120° viewing angle), and regulatory compliance (ROHS3 compliant, REACH unaffected).

Both parts are classified as obsolete, indicating limited availability through standard distribution channels. The 5973601207F currently maintains higher inventory levels (1763 pcs) compared to the VLMB31K2L2-3-GS18 (694 pcs), providing improved procurement accessibility.

Electrical parameter differences exist between the two parts: the Dialight substitute operates at a lower forward voltage (3.5V versus 3.9V) and delivers slightly higher brightness (11.15mcd versus 10.5mcd). These differences fall within acceptable ranges for indicator LED applications and do not require circuit redesign when substituting the Dialight part into existing designs.

Dimensional variations are minimal. The Dialight part measures 3.20mm × 2.70mm with a maximum height of 1.90mm, compared to the Vishay part at 3.00mm × 2.80mm with 1.85mm height. These tolerances remain compatible with standard 2-PLCC footprints on PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can the Dialight 5973601207F directly replace the VLMB31K2L2-3-GS18 without PCB modification?

A: Yes. Both parts use the 2-PLCC surface mount package with identical pin configuration and compatible footprint dimensions. The dimensional differences (0.20mm length, 0.10mm width, 0.05mm height variation) fall within standard PCB design tolerances for this package type.

Q: What is the impact of the forward voltage difference (3.5V versus 3.9V)?

A: The Dialight substitute operates at 0.4V lower forward voltage. In series resistor-limited LED circuits, this results in slightly higher current flow through the LED at the same supply voltage. Circuit designs using current-limiting resistors will experience marginally increased brightness. For voltage-regulated designs, the difference is negligible.

Q: Are both parts compliant with current environmental regulations?

A: Yes. Both the VLMB31K2L2-3-GS18 and 5973601207F are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component procurement and use.

Q: Why is the Dialight part brighter (11.15mcd versus 10.5mcd)?

A: The brightness difference of 0.65mcd represents approximately 6% higher luminous intensity in the Dialight part. This is within normal manufacturing variation for LED components and does not create compatibility issues in indicator applications where the visual output remains clearly visible.

Q: What is the significance of both parts being classified as obsolete?

A: Obsolete status indicates both parts are no longer in active production. Procurement must occur through existing inventory channels or secondary market sources. The higher current inventory of the Dialight part (1763 pcs versus 694 pcs) provides better availability for near-term requirements.

Q: Are there any package or mounting differences between these parts?

A: No. Both parts are surface mount components in 2-PLCC packages with identical mounting methodology. Standard SMD assembly equipment and processes apply to both parts without modification.

Q: How do the wavelength specifications compare?

A: Both parts share the same peak wavelength (428nm) and operate in the blue spectrum. The Vishay part specifies a dominant wavelength of 466nm, while the Dialight part does not provide this specification. The peak wavelength alignment ensures color consistency in visual indication applications.