QBLP601-S1 Red 0603 SMD LED Equivalent & Substitute Parts

Part Overview

The QBLP601-S1 is a red 640nm LED indicator in 0603 (1608 Metric) surface mount package manufactured by QT Brightek. This part is classified as obsolete, with 1110 units currently in stock. The QBLP601-S1 features a clear lens, 12mcd brightness rating, and 2.1V forward voltage at 20mA test current. Due to its obsolete status, identifying functionally equivalent substitute parts is essential for ongoing design support and production continuity.

Substiute Parts

QBLP601-S1

QT Brightek (QTB)In Stock: 1133QBLP601-S1 Datasheet

Current PartRFQ

QBLP601-S3

QT Brightek (QTB)In Stock: 4814QBLP601-S3 Datasheet

MFR RecommendedRFQ

SML-E12U8WT86

Rohm SemiconductorIn Stock: 85258SML-E12U8WT86 Datasheet

SimilarRFQ

SML-E12UWT86

Rohm SemiconductorIn Stock: 9811SML-E12UWT86 Datasheet

SimilarRFQ

SML-E12V8WT86

Rohm SemiconductorIn Stock: 5468SML-E12V8WT86 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the QBLP601-S1 are identified based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

• Package / Case: 0603 (1608 Metric) surface mount
• Mounting Type: Surface Mount
• Color: Red
• Current - Test: 20mA
• Voltage - Forward (Vf): Range 2.0V to 2.2V (acceptable tolerance for red LEDs)
• Wavelength - Dominant: Red spectrum (620nm to 640nm)
• RoHS Status: ROHS3 Compliant

Substitution Logic:

The QBLP601-S3 is the manufacturer-recommended direct substitute from QT Brightek, maintaining the same base product number (QBLP601) with active product status. This part meets all primary compatibility criteria with identical package dimensions and mounting specifications.

The Rohm Semiconductor EXCELED™ series parts (SML-E12U8WT86, SML-E12UWT86, SML-E12V8WT86) are classified as similar substitutes. These parts share the identical 0603 (1608 Metric) package, surface mount configuration, and red color specification. However, they feature diffused lens transparency (versus clear) and white lens color (versus colorless), resulting in different optical characteristics. Forward voltage ranges from 2.1V to 2.2V, and wavelength-dominant values span 620nm to 630nm, all within acceptable red LED parameters.

Parameter Comparison

Engineering Selection Recommendations

QBLP601-S3 (Manufacturer-Recommended Substitute)

The QBLP601-S3 is the primary substitute for the obsolete QBLP601-S1. Both parts share identical package specifications, mounting type, and optical configuration (clear colorless lens). The QBLP601-S3 maintains active product status with 4765 units in stock, ensuring long-term availability. Forward voltage is 2.0V versus 2.1V on the original part, representing a 0.1V reduction within acceptable operating tolerance for red LED circuits. The brightness rating increases from 12mcd to 25mcd, providing enhanced luminous intensity. RoHS3 compliance and MSL 3 rating match the original specification. This part is suitable for direct replacement in applications where the original QBLP601-S1 was specified.

Rohm Semiconductor EXCELED™ Series (Similar Substitutes)

The SML-E12U8WT86, SML-E12UWT86, and SML-E12V8WT86 parts are functionally compatible alternatives with the same 0603 package and surface mount configuration. These parts differ in optical characteristics: diffused lens transparency and white lens color versus the clear colorless lens of the original part. This optical difference results in different light distribution patterns and perceived brightness characteristics. Forward voltage ranges from 2.1V to 2.2V, and wavelength-dominant values span 620nm to 630nm, all within red LED specifications. All three parts maintain ROHS3 compliance. The SML-E12UWT86 offers the closest electrical match with 2.1V forward voltage and MSL 3 rating. Height is reduced to 0.46mm compared to 0.60mm on the original part, providing improved PCB clearance. These parts are suitable for applications where diffused red indication is acceptable and optical characteristics do not require clear lens transparency.

Frequently Asked Questions (FAQ)

Q: Can the QBLP601-S3 be used as a direct replacement for the QBLP601-S1?

A: Yes. The QBLP601-S3 is the manufacturer-recommended substitute with identical package dimensions (1.60mm L x 0.80mm W), mounting type (surface mount), and lens configuration (clear colorless). Forward voltage differs by 0.1V (2.0V versus 2.1V), which is within acceptable tolerance for red LED indicator circuits. The increased brightness rating (25mcd versus 12mcd) provides enhanced visibility without requiring circuit modifications.

Q: What is the primary difference between the QBLP601-S1 and the Rohm Semiconductor EXCELED™ series substitutes?

A: The primary difference is lens configuration. The QBLP601-S1 features a clear colorless lens, while the EXCELED™ series (SML-E12U8WT86, SML-E12UWT86, SML-E12V8WT86) feature diffused white lenses. This results in different light distribution patterns. Clear lenses provide directional light output, while diffused lenses scatter light over a wider viewing angle. Wavelength-dominant values also differ: QBLP601-S1 is 640nm, while EXCELED™ parts range from 620nm to 630nm. All parts maintain identical 0603 package dimensions and surface mount configuration.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The QBLP601-S3 and all Rohm Semiconductor EXCELED™ series parts (SML-E12U8WT86, SML-E12UWT86, SML-E12V8WT86) are ROHS3 compliant, matching the original QBLP601-S1 specification.

Q: What is the difference in height between the original part and the Rohm substitutes?

A: The QBLP601-S1 has a maximum height of 0.60mm. The QBLP601-S3 is 0.70mm. The Rohm Semiconductor EXCELED™ series parts are 0.46mm, providing 0.14mm additional PCB clearance compared to the original part. This reduced height may be advantageous in space-constrained applications.

Q: Which substitute offers the closest electrical match to the QBLP601-S1?

A: The SML-E12UWT86 offers the closest electrical match with 2.1V forward voltage (identical to the original part) and MSL 3 rating. However, it features a diffused white lens versus the clear colorless lens of the original part.

Q: Can the QBLP601-S1 be replaced with a Rohm EXCELED™ part in a circuit designed for clear lens indication?

A: Substitution depends on application requirements. If the circuit design requires directional light output with a clear lens, the diffused white lens of the EXCELED™ series will alter the optical characteristics and may not meet the intended application. The QBLP601-S3 is the appropriate choice for applications requiring clear lens transparency. The EXCELED™ series is suitable for applications where diffused red indication is acceptable.

Q: What is the inventory status of each substitute part?

A: QBLP601-S3 has 4765 units in stock. SML-E12U8WT86 has 85200 units. SML-E12UWT86 has 9723 units. SML-E12V8WT86 has 5400 units. All parts are available as new original stock.

Q: Are there packaging differences between the substitute parts?

A: Yes. The QBLP601-S3 is supplied in Tape & Reel (TR) packaging. The SML-E12U8WT86 and SML-E12UWT86 are supplied in Tape & Reel (TR). The SML-E12V8WT86 is supplied in Cut Tape (CT) & Digi-Reel® packaging. Packaging selection may affect procurement and assembly processes.