QBLP671-O Orange LED 2-PLCC SMD Equivalent & Substitute Parts

Part Overview

The QBLP671-O is an orange LED indicator manufactured by QT Brightek (QTB), designed for discrete indication applications in surface mount configurations. This component features a 605nm dominant wavelength with 900mcd brightness rating in a 2-PLCC package format. The product is currently classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support, production continuity, and component sourcing.

Substiute Parts

QBLP671-O

QT Brightek (QTB)In Stock: 1106QBLP671-O Datasheet

Current PartRFQ

VLMO333U2AB-GS18

Vishay Semiconductor Opto DivisionIn Stock: 8287VLMO333U2AB-GS18 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the QBLP671-O is determined by strict alignment with the following critical parameters:

Primary Substitution Criteria:

• Color: Orange (mandatory match)
• Wavelength - Dominant: 605nm (mandatory match)
• Mounting Type: Surface Mount (mandatory match)
• Package / Case: 2-PLCC or equivalent SMD configuration (mandatory match)
• Voltage - Forward (Vf): Within acceptable circuit design tolerance (2V nominal)
• Current - Test: 20mA standard operating condition
• Viewing Angle: 120° (standard for this category)
• Lens Size: 2.40mm Dia (physical compatibility)
• RoHS Status: ROHS3 Compliant (regulatory requirement)
• Moisture Sensitivity Level: 2A classification (handling compatibility)

Secondary Compatibility Factors:

• Millicandela Rating: Minimum 900mcd (brightness performance)
• Product Status: Active preferred for long-term availability

The substitute part VLMO333U2AB-GS18 meets all primary and secondary criteria, with minor variations in forward voltage (2.1V vs 2V) and physical dimensions that remain within acceptable substitution parameters for this product category.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility:

The VLMO333U2AB-GS18 qualifies as a direct substitute for the QBLP671-O based on matching optical, electrical, and mechanical specifications. Both components are ROHS3 compliant and share identical moisture sensitivity classifications, ensuring regulatory and handling compatibility.

Key Considerations:

1. Forward Voltage Variance: The substitute operates at 2.1V versus the original 2V specification. This 0.1V difference is within standard circuit design tolerance for LED indicator applications and does not require circuit redesign.

2. Brightness Performance: The substitute provides 950mcd compared to the original 900mcd specification, representing a 5.6% increase in brightness. This enhancement maintains or improves visual indication performance.

3. Physical Dimensions: The substitute features a lower profile (1.85mm vs 2.15mm height) and slightly reduced length (3.00mm vs 3.20mm). These dimensional differences are compatible with standard 2-PLCC PCB footprints and do not impact assembly or functionality.

4. Product Status: The substitute maintains active production status with Vishay Semiconductor Opto Division, providing superior long-term availability compared to the obsolete QBLP671-O.

5. Packaging: The substitute is supplied in Tape & Reel format, supporting automated assembly processes. Both components utilize equivalent 2-PLCC/2-SMD package configurations.

Compliance Verification:

Both components satisfy identical regulatory requirements (ROHS3, EAR99 export classification, HTSUS tariff code 8541.41.0000) and environmental handling specifications (MSL 2A, 4-week moisture exposure limit).

Frequently Asked Questions (FAQ)

Q: Can VLMO333U2AB-GS18 be used as a direct replacement for QBLP671-O without circuit modification?

A: Yes. The substitute meets all critical electrical parameters within acceptable tolerance. The 0.1V forward voltage difference does not require circuit redesign for standard LED indicator applications. PCB footprint compatibility is maintained through equivalent 2-PLCC/2-SMD package configurations.

Q: What is the significance of the forward voltage difference (2V vs 2.1V)?

A: The 0.1V variance represents a 5% difference and falls within standard design tolerance for LED indicator circuits. Most current-limiting resistor designs accommodate this variance without performance degradation. Verify circuit design specifications if operating at voltage limits.

Q: Does the lower profile height of the substitute (1.85mm vs 2.15mm) affect PCB assembly?

A: No. The reduced height is compatible with standard 2-PLCC footprints and does not impact pick-and-place assembly, reflow soldering, or component clearance. The lower profile may provide additional board-level clearance benefits.

Q: Are there any compliance or certification differences between the two parts?

A: No. Both components are ROHS3 compliant, share identical moisture sensitivity levels (2A, 4 weeks), and carry the same export classification (EAR99) and tariff code (8541.41.0000).

Q: Why is the substitute brighter (950mcd vs 900mcd)?

A: The 50mcd increase represents improved optical performance from the substitute manufacturer. This enhancement maintains or exceeds the original indication brightness requirement and does not negatively impact circuit operation.

Q: What is the availability advantage of VLMO333U2AB-GS18?

A: The substitute maintains active production status with Vishay Semiconductor Opto Division, ensuring long-term component availability. The original QBLP671-O is classified as obsolete, creating sourcing risk for ongoing production and field service applications.

Q: Are the packaging formats (2-PLCC vs 2-SMD, J-Lead) interchangeable?

A: Yes. Both configurations are equivalent surface mount packages with identical footprint compatibility. The 2-SMD, J-Lead designation describes the same physical form factor as 2-PLCC for this product category.

Q: What is the wavelength significance of the peak specification (611nm) provided for the substitute?

A: The peak wavelength (611nm) represents the spectral distribution maximum, while the dominant wavelength (605nm) defines the perceived color. Both specifications confirm orange color classification and optical compatibility with the original part.