LED BLUE 455NM SMD QBHP684UE-IBU Equivalent & Substitute Parts

Part Overview

The QBHP684UE-IBU 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 operates at a nominal wavelength of 455nm within the range of 450nm to 460nm and delivers 20lm typical luminous flux at 350mA test current with a forward voltage of 3.4V.

The QBHP684UE-IBU is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this LED specification.

Key Parameters

Parameter	Value	Unit
Wavelength (Nominal)	455	nm
Wavelength Range	450 – 460	nm
Current – Test	350	mA
Current – Maximum	700	mA
Voltage – Forward (Vf) Typical	3.4	V
Luminous Flux @ Test Current	20	lm (Typ)
Lumens/Watt @ Test Current	17	lm/W
Package / Case	1414 (3535 Metric)	–
Mounting Type	Surface Mount	–
Size / Dimension	3.60 × 3.60	mm
Height – Seated (Max)	1.90	mm
Temperature – Test	25	°C
Moisture Sensitivity Level (MSL)	3	168 Hours

Substitute Part Grouping Explanation

Substitution of the QBHP684UE-IBU is determined by the following critical parameters:

Color and Wavelength Compatibility: The substitute part must emit blue light within or overlapping the wavelength range of 450nm to 460nm. The QBHP684UE-IBU operates at 455nm nominal; substitute parts with wavelengths in the extended blue spectrum (up to 470nm) remain functionally compatible for most lighting applications due to human eye perception of blue hues.

Package and Mounting Compatibility: The substitute must use the 1414 (3535 Metric) surface mount package to ensure mechanical fit on existing printed circuit boards and compatibility with automated assembly equipment.

Electrical Operating Range: The substitute must accommodate the forward voltage and current specifications of the original design. The QBHP684UE-IBU operates at 3.4V typical forward voltage with a maximum current rating of 700mA. Substitute parts must fall within acceptable voltage and current ranges to function in the same circuit topology.

Luminous Flux and Efficiency: The substitute should deliver comparable luminous flux output (approximately 20lm) to maintain lighting performance. Efficiency (lm/W) may vary within acceptable limits depending on application requirements.

Product Status and Availability: Active product status and confirmed inventory availability are essential for reliable supply chain continuity.

Parameter Comparison

Parameter	QBHP684UE-IBU (Main Part)	ELSW-E81B3-0LPNM-DB6B8 (Substitute)	Compatibility Notes
Manufacturer	QT Brightek (QTB)	Everlight Electronics Co Ltd	Different manufacturers
Color	Blue	Blue	Match
Wavelength (Nominal)	455	463	Within acceptable blue spectrum range
Wavelength Range	450 – 460	455 – 470	Overlapping ranges; substitute extends to longer wavelengths
Current – Test	350	700	Substitute rated at higher test current
Current – Maximum	700	750	Substitute maximum slightly higher
Voltage – Forward (Vf) Typical	3.4	3.55	0.15V difference; acceptable for most circuits
Luminous Flux @ Test Current	20 (Typ)	22 (20 – 23)	Comparable output; substitute slightly higher
Lumens/Watt @ Test Current	17	9	Substitute efficiency lower at rated test current
Package / Case	1414 (3535 Metric)	1414 (3535 Metric)	Match
Mounting Type	Surface Mount	Surface Mount	Match
Size / Dimension	3.60 × 3.60	3.50 × 3.50	0.10mm smaller; within PCB tolerance
Height – Seated (Max)	1.90	2.23	0.33mm taller; verify clearance in enclosure
Viewing Angle	Not specified	120°	Substitute provides specified viewing angle
Thermal Resistance	Not specified	6°C/W	Substitute provides thermal data
Product Status	Obsolete	Active	Substitute is currently in production
Moisture Sensitivity Level (MSL)	3 (168 Hours)	1 (Unlimited)	Substitute has superior moisture resistance
RoHS Status	Not specified	ROHS3 Compliant	Substitute meets RoHS3 requirements
Inventory Status	779 Pcs New Original In Stock	922 Pcs New Original In Stock	Both parts available; substitute has higher inventory

Engineering Selection Recommendations

For Direct Substitution: The ELSW-E81B3-0LPNM-DB6B8 from Everlight Electronics qualifies as a functional substitute for the obsolete QBHP684UE-IBU based on the following criteria:

Package Compatibility: Both parts use the 1414 (3535 Metric) surface mount package, ensuring mechanical fit on existing PCB layouts.
Color and Wavelength: Both emit blue light within the visible blue spectrum. The substitute's 463nm nominal wavelength falls within the extended blue range (455nm to 470nm) and overlaps with the original part's 450nm to 460nm specification range.
Electrical Compatibility: The substitute's forward voltage of 3.55V is 0.15V higher than the original 3.4V. This difference is within acceptable tolerance for most LED circuit designs using current-limiting resistors or constant-current drivers. The substitute's maximum current rating of 750mA exceeds the original 700mA maximum, providing operational margin.
Product Status and Compliance: The ELSW-E81B3-0LPNM-DB6B8 is classified as active product with confirmed inventory availability (922 pcs). It meets RoHS3 compliance requirements and demonstrates superior moisture sensitivity level (MSL 1 vs. MSL 3), reducing handling and storage risks.
Physical Dimensions: The substitute is 0.10mm smaller in lateral dimension (3.50mm vs. 3.60mm) and 0.33mm taller in seated height (2.23mm vs. 1.90mm). Verify that the increased height does not violate clearance constraints within the final assembly enclosure.

Operational Considerations: The substitute operates at a higher test current (700mA vs. 350mA) and delivers slightly higher luminous flux (22lm vs. 20lm). Efficiency at the substitute's rated test current is lower (9 lm/W vs. 17 lm/W); however, when operated at the original design current of 350mA, efficiency characteristics will differ. Circuit design must account for the 0.15V forward voltage difference through appropriate resistor or driver adjustment.

Frequently Asked Questions (FAQ)

Q1: Can the ELSW-E81B3-0LPNM-DB6B8 be used as a direct drop-in replacement for the QBHP684UE-IBU?

A: The ELSW-E81B3-0LPNM-DB6B8 is mechanically compatible (same 1414 package) and functionally compatible (blue LED, overlapping wavelength range). However, the 0.15V higher forward voltage and 0.33mm greater seated height require verification. Forward voltage difference must be accommodated in circuit design through resistor or driver adjustment. Seated height must be verified against enclosure clearance specifications.

Q2: What is the wavelength difference between these two parts, and does it affect application performance?

A: The QBHP684UE-IBU operates at 455nm nominal (450–460nm range), while the ELSW-E81B3-0LPNM-DB6B8 operates at 463nm nominal (455–470nm range). The 8nm difference falls within the blue spectrum and is typically imperceptible to human vision in most lighting applications. Both parts emit blue light suitable for indicator, display, and general illumination purposes.

Q3: Are there electrical compatibility concerns when substituting these parts?

A: The forward voltage difference of 0.15V (3.4V vs. 3.55V) is the primary electrical consideration. In circuits using current-limiting resistors, this difference requires recalculation of resistor values to maintain desired LED current. In circuits using constant-current drivers, the voltage difference is automatically compensated. Maximum current ratings are compatible (700mA original vs. 750mA substitute).

Q4: What are the moisture sensitivity implications of using the substitute part?

A: The QBHP684UE-IBU has MSL 3 (168-hour floor life), while the ELSW-E81B3-0LPNM-DB6B8 has MSL 1 (unlimited floor life). The substitute part has superior moisture resistance and lower handling/storage risk. This is an advantage for supply chain management and long-term inventory storage.

Q5: Does the substitute part meet regulatory compliance requirements?

A: The ELSW-E81B3-0LPNM-DB6B8 is confirmed RoHS3 compliant. Both parts share the same ECCN (EAR99) and HTSUS (8541.41.0000) classifications, indicating equivalent regulatory treatment for export and trade purposes.

Q6: How does the package size difference affect PCB layout?

A: The substitute is 0.10mm smaller in lateral dimension (3.50mm vs. 3.60mm) and 0.33mm taller in seated height (2.23mm vs. 1.90mm). The smaller lateral dimension provides additional PCB routing clearance. The increased height must be verified against vertical clearance constraints in the final assembly. No PCB footprint redesign is required; the substitute fits within the original 1414 footprint.

Q7: What inventory considerations should guide the substitution decision?

A: The QBHP684UE-IBU (obsolete) has 779 pcs in stock. The ELSW-E81B3-0LPNM-DB6B8 (active) has 922 pcs in stock with ongoing production availability. For long-term supply continuity, the active substitute part is preferable.

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