QBLP671E-IG Equivalent & Substitute Parts

Part Overview

The QBLP671E-IG is a green LED indication component manufactured by QT Brightek, featuring a 525nm dominant wavelength and 1500mcd brightness rating in a 2-PLCC surface mount package. This part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. The component operates at 3.1V forward voltage with a 20mA test current and provides a 120° viewing angle suitable for indicator applications.

Substiute Parts

QBLP671E-IG

QT Brightek (QTB)In Stock: 1157QBLP671E-IG Datasheet

Current PartRFQ

5973329207F

DialightIn Stock: 11405973329207F Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the QBLP671E-IG is determined by the following critical parameters:

Color and Wavelength Matching: The substitute must emit green light at 525nm dominant wavelength to maintain optical consistency in indication applications.

Electrical Compatibility: Forward voltage (Vf) and test current must be within acceptable ranges for existing circuit designs. The QBLP671E-IG operates at 3.1V/20mA; substitutes with higher voltage or current ratings require circuit evaluation.

Brightness Level: The 1500mcd rating establishes the minimum brightness requirement. Substitutes with equal or higher brightness ratings maintain or improve visibility performance.

Viewing Angle: The 120° viewing angle is a standard specification for indicator LEDs. Substitutes must maintain this angle for consistent visibility across the intended viewing range.

Mounting and Package Considerations: Surface mount technology is required. While the QBLP671E-IG uses a 2-PLCC package, functionally equivalent parts may use alternative PLCC configurations (such as 4-PLCC) provided the footprint and height remain compatible with PCB layout constraints.

Compliance and Status: RoHS3 compliance is mandatory. Active product status is preferred for long-term availability, though obsolete parts may be substituted if all other parameters align.

The substitute part 5973329207F from Dialight meets these criteria with matching color, wavelength, viewing angle, and compliance status, though with differences in package configuration and electrical ratings that require circuit-level assessment.

Parameter Comparison

Engineering Selection Recommendations

Primary Consideration - Product Status: The QBLP671E-IG is obsolete, while the 5973329207F substitute is active. Active product status provides superior long-term availability and supply chain stability for new designs and ongoing production.

Electrical Parameter Differences: The 5973329207F operates at 3.4V forward voltage and 30mA test current, compared to the QBLP671E-IG at 3.1V and 20mA. These differences require circuit-level evaluation. Existing designs using current-limiting resistors or constant-current drivers must be assessed to confirm compatibility with the higher voltage and current requirements.

Brightness Enhancement: The 5973329207F provides 1800mcd versus 1500mcd in the main part. This 20% brightness increase maintains or improves indicator visibility without introducing compatibility issues.

Package Configuration: The transition from 2-PLCC to 4-PLCC requires PCB footprint verification. While both packages share identical lateral dimensions (3.20 x 2.80 mm) and similar heights (2.10 mm vs 2.15 mm), the internal lead configuration differs. PCB layout and solder reflow profiles must be validated for the 4-PLCC package.

Compliance Alignment: Both parts meet ROHS3 compliance requirements, ensuring regulatory consistency.

Recommendation: The 5973329207F is suitable as a substitute for the obsolete QBLP671E-IG in applications where circuit design accommodates the higher forward voltage and test current. PCB layout modifications for the 4-PLCC package are required.

Frequently Asked Questions (FAQ)

Q: Can the 5973329207F directly replace the QBLP671E-IG without circuit modifications?

A: Direct replacement requires verification of circuit design. The 5973329207F operates at 3.4V forward voltage and 30mA test current, compared to 3.1V and 20mA for the QBLP671E-IG. Circuits using fixed resistor current limiting must be recalculated. Constant-current driver circuits typically accommodate this variation without modification.

Q: What is the impact of the package change from 2-PLCC to 4-PLCC?

A: The 4-PLCC package has a different internal lead configuration than the 2-PLCC. Lateral dimensions and height are compatible, but PCB footprints are not interchangeable. New PCB artwork is required for the 4-PLCC package. Solder reflow parameters may require adjustment based on the specific 4-PLCC design.

Q: Does the higher brightness of the 5973329207F (1800mcd vs 1500mcd) create any compatibility issues?

A: Higher brightness does not create compatibility issues in standard indicator applications. The increased light output improves visibility. If the original design relied on brightness limiting for specific visual effects, the higher output may require adjustment of current-limiting resistor values.

Q: Are both parts RoHS compliant?

A: Yes. Both the QBLP671E-IG and 5973329207F are ROHS3 compliant, ensuring regulatory consistency for applications subject to RoHS requirements.

Q: Why is the 5973329207F preferred despite electrical differences?

A: The 5973329207F has active product status, ensuring long-term availability and supply chain support. The QBLP671E-IG is obsolete, limiting future procurement options. The electrical differences are manageable through circuit design verification.

Q: What viewing angle do both parts provide?

A: Both the QBLP671E-IG and 5973329207F provide a 120° viewing angle, maintaining consistent visibility performance across the intended viewing range.

Q: Are there any moisture sensitivity considerations for these parts?

A: The QBLP671E-IG has MSL 2A (4 weeks), while the 5973329207F has MSL 2 (1 year). The substitute offers superior moisture tolerance, reducing handling and storage constraints.