QBLP678-RGB1 Equivalent & Substitute Parts

Part Overview

The QBLP678-RGB1 is a surface-mount RGB LED indicator in 6-PLCC packaging manufactured by QT Brightek. This component features independent red, green, and blue light-emitting elements with diffused white lens and square flat-top design. The part is classified as obsolete, necessitating identification of active equivalent components for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility across electrical characteristics, optical performance, and mechanical form factors.

Substiute Parts

QBLP678-RGB1

QT Brightek (QTB)In Stock: 980QBLP678-RGB1 Datasheet

Current PartRFQ

QBLP680-RGB1

QT BrightekIn Stock: 25704QBLP680-RGB1 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the QBLP678-RGB1 is determined by the following critical parameters:

Electrical Compatibility: Forward voltage specifications for each color channel (red, green, blue) must remain within acceptable operating ranges. Test current of 20mA across all channels establishes the baseline for brightness and performance comparison.

Optical Performance: Dominant wavelengths define color accuracy. Millicandela ratings determine brightness output. Viewing angle of 120° establishes the light distribution requirement.

Mechanical Compatibility: Surface-mount packaging type, lens size, and form factor must accommodate existing PCB layouts and assembly processes. Lens transparency (diffused) and color (white) affect light distribution characteristics.

Regulatory Compliance: RoHS3 compliance and MSL rating of 3 are mandatory for production environments.

The QBLP680-RGB1 qualifies as a substitute based on matching configuration (independent RGB), mounting type (surface mount), viewing angle (120°), test current (20mA), RoHS compliance, and MSL rating. Variations in lens size, package designation, forward voltage ranges, and millicandela ratings are documented in the parameter comparison table.

Parameter Comparison

Engineering Selection Recommendations

For Obsolete Part Replacement: The QBLP678-RGB1 is classified as obsolete. The QBLP680-RGB1 is an active product from the same manufacturer with equivalent electrical and optical functionality. Selection of the QBLP680-RGB1 ensures ongoing component availability and supply chain continuity.

Compliance Verification: Both parts maintain ROHS3 compliance and identical MSL ratings, satisfying regulatory requirements for production environments.

Design Considerations: The QBLP680-RGB1 features a smaller lens size (2.50mm vs. 3.00mm) and reduced overall height (1.80mm vs. 2.80mm). Forward voltage variations for green and blue channels are within typical LED tolerance ranges. Millicandela ratings differ across color channels; brightness output should be evaluated against application requirements.

Package Transition: The QBLP680-RGB1 uses 6-SMD J-Lead packaging versus the QBLP678-RGB1's 6-PLCC format. PCB footprint redesign is required for mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can the QBLP680-RGB1 directly replace the QBLP678-RGB1 without PCB modification?

A: No. The QBLP680-RGB1 uses 6-SMD J-Lead packaging while the QBLP678-RGB1 uses 6-PLCC packaging. Different footprints require PCB redesign. However, electrical and optical functionality are compatible.

Q: What are the key electrical differences between these parts?

A: Forward voltage for green and blue channels differs slightly (green: 3.2V vs. 2.9V; blue: 3.2V vs. 3V). Red channel voltage is identical at 2V. Test current remains 20mA for all colors. These variations are within standard LED operating tolerances.

Q: How do brightness levels compare?

A: The QBLP680-RGB1 provides higher brightness for red (900mcd vs. 700mcd) and green (2300mcd vs. 1600mcd) channels. Blue brightness is lower (350mcd vs. 440mcd). Application-specific brightness requirements must be evaluated.

Q: Are wavelength specifications compatible?

A: Dominant wavelengths are nearly identical. Red: 620nm vs. 622nm; green: 525nm vs. 522nm; blue: 470nm vs. 467nm. These variations are within standard color specification ranges for RGB indicators.

Q: What is the impact of lens size reduction?

A: The QBLP680-RGB1 features a 2.50mm lens versus 3.00mm on the QBLP678-RGB1. This affects light distribution area and visual appearance. PCB layout and viewing distance requirements must be considered.

Q: Do both parts meet the same regulatory standards?

A: Yes. Both parts are ROHS3 compliant with MSL rating 3 (168 hours), satisfying identical regulatory and environmental requirements.

Q: What packaging formats are available?

A: QBLP678-RGB1 is supplied in Cut Tape (CT) and Digi-Reel® formats. QBLP680-RGB1 is supplied in Tape & Reel (TR) format. Packaging selection depends on production volume and assembly equipment compatibility.