QBHP684UE-IBV LED Blue 455nm SMD Equivalent & Substitute Parts

Part Overview

The QBHP684UE-IBV is a blue light-emitting diode (LED) manufactured by QT Brightek, designed for surface mount applications in the 1414 (3535 Metric) package format. This component emits light at 455nm wavelength with a typical luminous flux of 34lm at 700mA test current. The product is classified as obsolete, making identification of functionally equivalent substitute components necessary for ongoing design support, production continuity, and component sourcing.

Substiute Parts

QBHP684UE-IBV

QT Brightek (QTB)In Stock: 889QBHP684UE-IBV Datasheet

Current PartRFQ

ELSW-E91B3-0LPNM-DB6B8

Everlight Electronics Co LtdIn Stock: 943ELSW-E91B3-0LPNM-DB6B8 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the QBHP684UE-IBV is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Wavelength range overlap within blue spectrum (450–470nm acceptable)
• Identical package format: 1414 (3535 Metric)
• Surface mount mounting type
• Forward voltage (Vf) compatibility within ±0.2V tolerance
• Maximum current rating ≥700mA
• Test current compatibility at 700mA

Secondary Compatibility Factors:

• Physical dimensions (length, width, height) within ±0.5mm variance
• Thermal and moisture handling characteristics

The ELSW-E91B3-0LPNM-DB6B8 from Everlight Electronics meets these criteria through wavelength range overlap (463nm within 455–470nm specification), identical package geometry, and compatible electrical ratings.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility:

The ELSW-E91B3-0LPNM-DB6B8 is a valid substitute for the obsolete QBHP684UE-IBV based on the following engineering factors:

1. Package Compatibility: Both components use identical 1414 (3535 Metric) surface mount packages with negligible dimensional variance (±0.33mm height, −0.10mm length/width). PCB footprints and reflow profiles remain unchanged.

2. Electrical Compatibility: Forward voltage differential of 0.05V is within standard circuit tolerance. Maximum current rating of 750mA on the substitute exceeds the 700mA test requirement, providing operational margin.

3. Wavelength Compatibility: The substitute's 463nm typical wavelength falls within the acceptable blue spectrum range (455–470nm) and overlaps with the original part's 450–460nm specification band.

4. Product Status and Compliance: The substitute is actively manufactured and RoHS3 compliant, ensuring long-term availability and regulatory alignment. The original part's obsolete status necessitates this substitution for production continuity.

5. Moisture Handling: The substitute's MSL rating of 1 (Unlimited) is superior to the original MSL 3 (168 Hours), reducing moisture-related handling and storage constraints.

Performance Consideration:

The substitute delivers 25lm typical luminous flux compared to the original 34lm, representing a 26% reduction in light output. This difference must be evaluated against application-specific brightness requirements. The 10 lm/W efficiency versus 13 lm/W on the original part reflects this trade-off.

Frequently Asked Questions (FAQ)

Q1: Can the ELSW-E91B3-0LPNM-DB6B8 be used as a direct drop-in replacement for the QBHP684UE-IBV?

A: Yes, from a mechanical and electrical standpoint. Both components share identical 1414 (3535 Metric) package geometry, surface mount configuration, and compatible forward voltage characteristics. PCB footprints and reflow parameters remain unchanged. However, the substitute produces lower luminous flux (25lm vs. 34lm), which must be evaluated against application brightness specifications.

Q2: What is the wavelength difference between these two LEDs, and does it matter?

A: The original emits 455nm (450–460nm range) while the substitute emits 463nm (455–470nm range). Both are blue LEDs with overlapping wavelength specifications. The 8nm difference is within the blue spectrum and typically imperceptible to human vision in most applications. Application-specific color matching requirements should be confirmed.

Q3: Are there any thermal or moisture handling differences?

A: Yes. The substitute has an MSL rating of 1 (Unlimited) compared to the original's MSL 3 (168 Hours). This means the substitute requires less stringent moisture control during storage and handling. The substitute also specifies a thermal resistance of 6°C/W, providing additional thermal management data not available for the original part.

Q4: What is the impact of the lower luminous flux on circuit design?

A: The substitute produces 9lm less light output at identical test current (700mA). Applications requiring specific brightness levels must account for this 26% reduction. If brightness is critical, circuit design may require increased drive current (up to the substitute's 750mA maximum rating) to compensate, though this will increase power consumption.

Q5: Are there any compliance or regulatory differences?

A: The substitute is RoHS3 compliant with active manufacturing status, ensuring regulatory alignment and long-term availability. The original part's obsolete status makes the substitute the preferred choice for new designs and production continuity.

Q6: What are the dimensional tolerances for PCB layout?

A: Both components use 1414 (3535 Metric) packages. The substitute is 0.10mm smaller in length and width (3.50mm vs. 3.60mm) and 0.33mm taller in seated height (2.23mm vs. 1.90mm). These variations are within standard PCB design tolerances and do not require layout modifications.