QBLP651-S1 LED Red Clear 1206 SMD Equivalent & Substitute Parts

Part Overview

The QBLP651-S1 is a red LED indicator in 1206 (3016 Metric) surface mount package manufactured by QT Brightek (QTB). This discrete component operates at 2V forward voltage with a 640nm dominant wavelength and 40mcd luminous intensity. The QBLP651-S1 is classified as obsolete product status, necessitating identification of active equivalent alternatives for ongoing design requirements and procurement continuity.

Substiute Parts

QBLP651-S1

QT Brightek (QTB)In Stock: 971QBLP651-S1 Datasheet

Current PartRFQ

QBLP651-S

QT Brightek (QTB)In Stock: 4007QBLP651-S Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete QBLP651-S1 is based on strict electrical and mechanical parameter matching within the red LED indicator category. The primary substitute QBLP651-S maintains compatibility through the following critical parameters:

Electrical Compatibility Parameters:

• Forward voltage (Vf): 2V (identical)
• Test current: 20mA (identical)
• Dominant wavelength: 640nm (identical)
• Viewing angle: 40° (identical)

Mechanical Compatibility Parameters:

• Package type: 1206 surface mount (identical footprint)
• Lens color: Colorless (identical)
• Lens transparency: Clear (identical)
• Mounting type: Surface Mount (identical)

Compliance Parameters:

• RoHS3 Compliant (identical)
• Moisture Sensitivity Level: 3 (168 Hours) (identical)
• REACH Status: REACH Unaffected (identical)

The QBLP651-S differs in millicandela rating (87mcd vs. 40mcd), lens style (Round with Domed Top vs. Round with Flat Top), package metric designation (3216 vs. 3016), and height specification (1.50mm vs. 1.40mm). These differences do not prevent functional substitution in applications where the original QBLP651-S1 was specified.

Parameter Comparison

Engineering Selection Recommendations

The QBLP651-S is the active equivalent for the obsolete QBLP651-S1. Selection of QBLP651-S is based on the following engineering criteria:

Product Status Alignment: The QBLP651-S1 is classified as obsolete, making continued procurement impossible. The QBLP651-S maintains active product status with manufacturer support and available inventory (3959 Pcs in stock).

Electrical Compatibility: Both parts operate at identical forward voltage (2V) and test current (20mA), ensuring circuit-level compatibility without modification to existing designs.

Mechanical Compatibility: Both parts utilize 1206 surface mount package with identical footprint dimensions (3.00mm L x 1.50mm W), permitting direct PCB layout reuse. The height difference (1.50mm vs. 1.40mm maximum) is within typical assembly clearance tolerances.

Compliance Certification: Both parts maintain ROHS3 compliance, identical moisture sensitivity level (MSL 3), and REACH unaffected status, satisfying regulatory requirements for equivalent substitution.

Packaging Availability: The QBLP651-S is available in Cut Tape (CT) and Tape & Reel (TR) packaging formats, providing procurement flexibility for production volumes.

Frequently Asked Questions (FAQ)

Q: Can QBLP651-S directly replace QBLP651-S1 in existing PCB designs?

A: Yes. Both parts share identical 1206 surface mount footprint dimensions (3.00mm L x 1.50mm W) and electrical parameters (2V forward voltage, 20mA test current, 640nm wavelength, 40° viewing angle). The maximum height difference (1.50mm vs. 1.40mm) does not prevent direct substitution in standard assembly processes.

Q: What is the difference in luminous intensity between these parts?

A: The QBLP651-S provides 87mcd compared to 40mcd for the QBLP651-S1. This increased brightness results from design improvements in the active substitute. Applications requiring the original 40mcd specification should evaluate whether the higher intensity is acceptable for the intended function.

Q: Are there packaging differences between QBLP651-S1 and QBLP651-S?

A: The QBLP651-S1 was supplied in standard packaging. The QBLP651-S is available in Cut Tape (CT) and Tape & Reel (TR) formats, providing options for manual assembly or automated pick-and-place operations. Both maintain identical component specifications.

Q: Do both parts meet the same compliance standards?

A: Yes. Both QBLP651-S1 and QBLP651-S are ROHS3 compliant, maintain MSL 3 (168 Hours) moisture sensitivity level, and are REACH unaffected. Regulatory compliance is equivalent for both parts.

Q: What is the difference between the lens styles?

A: The QBLP651-S1 features a Round with Flat Top lens, while QBLP651-S features a Round with Domed Top lens. Both maintain 1.10mm diameter and clear transparency. The lens style difference does not affect electrical performance or optical wavelength characteristics.

Q: Is the QBLP651-S1 still available for procurement?

A: The QBLP651-S1 is classified as obsolete. While 917 Pcs remain in current inventory, no new production is available. The QBLP651-S (active status) with 3959 Pcs in stock is the recommended procurement alternative.