QBLP671-R Equivalent & Substitute Parts Reference

Part Overview

The QBLP671-R is a red 625nm LED indicator in 2-PLCC surface mount package manufactured by QT Brightek (QTB). This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing production and maintenance applications. The part delivers 900mcd luminous intensity at 20mA test current with 2V typical forward voltage and 120° viewing angle in a compact 3.20mm × 2.80mm × 2.15mm form factor.

Substiute Parts

QBLP671-R

QT Brightek (QTB)In Stock: 897QBLP671-R Datasheet

Current PartRFQ

LR T67F-U1AA-1-1-Z

ams-OSRAM USA INC.In Stock: 31194LR T67F-U1AA-1-1-Z Datasheet

Parametric EquivalentRFQ

LR T68F-U1AA-1-1-Z

ams-OSRAM USA INC.In Stock: 33770LR T68F-U1AA-1-1-Z Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the QBLP671-R is determined by strict alignment of the following parameters:

Critical Matching Parameters:

• Color: Red
• Wavelength - Dominant: 625nm
• Package / Case: 2-PLCC
• Mounting Type: Surface Mount
• Lens Style: Round with Flat Top
• Lens Size: 2.40mm Dia
• Viewing Angle: 120°
• RoHS Status: ROHS3 Compliant

Allowable Variation Parameters:

• Voltage - Forward (Vf) Typical: ±0.1V tolerance acceptable
• Millicandela Rating: ±3% variation acceptable
• Height (Max): ±0.05mm tolerance acceptable
• Current - Test: Fixed at 20mA

The identified substitute parts LR T67F-U1AA-1-1-Z and LR T68F-U1AA-1-1-Z from ams-OSRAM USA INC. satisfy all critical matching parameters and fall within allowable variation ranges for electrical characteristics.

Parameter Comparison

Engineering Selection Recommendations

LR T68F-U1AA-1-1-Z (Primary Substitute): This part is the preferred substitute for QBLP671-R. It maintains active product status with ams-OSRAM USA INC., ensuring long-term availability and supply chain stability. The LR T68F-U1AA-1-1-Z is supplied in Tape & Reel (TR) packaging, suitable for high-volume automated assembly. Electrical parameters (2.05V Vf, 925mcd) are within acceptable variation from the original specification. RoHS3 compliance and REACH Unaffected status confirm regulatory alignment. The 0.05mm reduction in maximum height (2.10mm vs 2.15mm) is within mechanical tolerance for standard PCB assembly processes.

LR T67F-U1AA-1-1-Z (Secondary Substitute): This part provides equivalent electrical and optical performance to LR T68F-U1AA-1-1-Z but carries Last Time Buy status, indicating limited future availability. It is supplied in Cut Tape (CT) packaging, appropriate for lower-volume or manual assembly operations. Selection of this part should be limited to applications where Cut Tape packaging is operationally required, as the Last Time Buy status restricts long-term procurement viability.

Both substitute parts satisfy all critical matching parameters and regulatory requirements for direct replacement of the obsolete QBLP671-R in 2-PLCC red LED indication applications.

Frequently Asked Questions (FAQ)

Q: Can LR T68F-U1AA-1-1-Z directly replace QBLP671-R without circuit modification?

A: Yes. Both parts operate at 20mA test current with forward voltage within 0.05V (2.0V vs 2.05V), identical 2-PLCC package geometry, and matching optical specifications (625nm dominant wavelength, 120° viewing angle, 2.40mm lens diameter). No circuit redesign is required.

Q: What is the significance of the 25mcd difference in millicandela rating (900mcd vs 925mcd)?

A: The 2.8% increase in luminous intensity (925mcd vs 900mcd) is within normal manufacturing tolerance for LED indicators and does not affect functional performance in indication applications. Visual brightness will be imperceptibly different to the human eye.

Q: Why is the forward voltage 0.05V higher in the substitute parts?

A: The LR T67F-U1AA-1-1-Z and LR T68F-U1AA-1-1-Z operate at 2.05V typical forward voltage compared to 2.0V for QBLP671-R. This 2.5% increase is within standard LED manufacturing variation and acceptable for most indication circuit designs. Verify circuit current-limiting resistor values accommodate this voltage in your specific application.

Q: What is the difference between LR T67F-U1AA-1-1-Z and LR T68F-U1AA-1-1-Z?

A: Both parts are electrically and optically identical. The primary differences are: (1) Product Status: LR T67F is Last Time Buy; LR T68F is Active; (2) Packaging: LR T67F is Cut Tape (CT); LR T68F is Tape & Reel (TR); (3) Moisture Sensitivity: LR T67F is MSL 2 (1 Year); LR T68F is MSL 3 (168 Hours). For new designs, LR T68F-U1AA-1-1-Z is recommended due to active status and standard reel packaging.

Q: Are there any height clearance concerns with the 0.05mm reduction (2.15mm to 2.10mm)?

A: No. The 0.05mm reduction in maximum height is negligible for standard PCB assembly and does not affect component placement, solder reflow profiles, or board-level clearances in typical indication applications.

Q: Do the substitute parts maintain RoHS3 compliance?

A: Yes. Both LR T67F-U1AA-1-1-Z and LR T68F-U1AA-1-1-Z are ROHS3 Compliant, matching the compliance status of QBLP671-R. Both are also REACH Unaffected, confirming regulatory alignment for EU and international markets.

Q: What is the impact of different Moisture Sensitivity Levels (MSL)?

A: QBLP671-R is MSL 2A (4 Weeks); LR T67F is MSL 2 (1 Year); LR T68F is MSL 3 (168 Hours). MSL rating affects storage and handling requirements after package opening. Higher MSL numbers require shorter time-to-use windows. Verify your assembly process timeline and storage conditions align with the selected substitute's MSL rating.