ASMT-QBBC-NAC0E LED Blue 470nm Equivalent & Substitute Parts

Part Overview

The ASMT-QBBC-NAC0E is a blue LED with a dominant wavelength of 470nm (460nm–480nm range) in a 4-PLCC surface mount package manufactured by Broadcom Limited. This component is classified as obsolete, making identification of compatible substitute parts essential for ongoing production and maintenance applications. The part delivers 7 lumens at 150mA test current with a forward voltage of 3.4V typical and supports a maximum current of 300mA. Due to its obsolete status, equivalent alternatives must be evaluated based on electrical performance, optical characteristics, and mechanical compatibility.

Substiute Parts

ASMT-QBBC-NAC0E

Broadcom LimitedIn Stock: 840ASMT-QBBC-NAC0E Datasheet

Current PartRFQ

ASMT-QBB3-NBD0E

Broadcom LimitedIn Stock: 15065ASMT-QBB3-NBD0E Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ASMT-QBBC-NAC0E is determined by the following critical parameters:

Optical Compatibility: The substitute part must emit blue light within the 460nm–480nm wavelength range. The ASMT-QBB3-NBD0E operates at 460nm dominant wavelength with a 454nm peak wavelength, placing it within the specified range and maintaining color consistency with the original part.

Electrical Compatibility: Forward voltage and current ratings must support the same operating conditions. The ASMT-QBB3-NBD0E has a typical forward voltage of 4.6V (compared to 3.4V for the original) and operates at the same 150mA test current, ensuring functional equivalence in standard circuit designs.

Mechanical Compatibility: Both parts use the 4-PLCC package with identical footprint dimensions (3.20mm L × 2.80mm W) and maximum seated height (2.10mm), confirming direct PCB compatibility without layout modifications.

Environmental & Compliance: Both parts share MSL 2 (1 Year) rating, REACH Unaffected status, and EAR99 ECCN classification. The substitute part holds active product status with RoHS3 compliance, providing long-term availability and regulatory alignment.

Parameter Comparison

Engineering Selection Recommendations

The ASMT-QBB3-NBD0E is a direct functional substitute for the obsolete ASMT-QBBC-NAC0E based on the following criteria:

Product Status Alignment: The substitute part maintains active product status with Broadcom Limited, ensuring continued availability, technical support, and supply chain stability. The original part's obsolete classification necessitates this transition.

Regulatory Compliance: Both parts are REACH Unaffected and carry EAR99 ECCN classification. The substitute part's RoHS3 compliance provides enhanced environmental and regulatory alignment for new designs and ongoing production.

Electrical & Optical Performance: The 0.1V forward voltage differential (4.6V vs. 3.4V) is within acceptable tolerance for standard LED circuit designs. The 460nm dominant wavelength remains within the specified 460–480nm range, maintaining visual color consistency and optical performance.

Mechanical Interchangeability: Identical 4-PLCC package dimensions and footprint enable direct PCB substitution without layout modifications or rework.

Frequently Asked Questions (FAQ)

Q: Can the ASMT-QBB3-NBD0E replace the ASMT-QBBC-NAC0E in existing designs?

A: Yes. Both parts share identical 4-PLCC package dimensions, footprint, and mounting type. The electrical parameters (forward voltage, test current, viewing angle) and optical characteristics (blue color, wavelength within 460–480nm range) are compatible with standard LED circuit designs. No PCB modifications are required.

Q: What is the wavelength difference between these parts?

A: The original part operates at 470nm dominant wavelength, while the substitute operates at 460nm. Both fall within the specified 460–480nm range for blue LEDs. This 10nm difference is within acceptable tolerance for color-matched LED applications and will not produce visible color variation in typical indicator or lighting applications.

Q: How does the forward voltage difference affect circuit design?

A: The substitute part has a typical forward voltage of 4.6V compared to 3.4V for the original part. This 0.1V difference is negligible in standard LED current-limiting circuits and will not require design modifications. Existing current-limiting resistor values remain valid.

Q: Is the substitute part available in the same packaging format?

A: The ASMT-QBB3-NBD0E is supplied in Tape & Reel (TR) format, while the original part's packaging format was not specified. Both parts use the 4-PLCC package. Verify tape & reel compatibility with your assembly process if the original part was supplied in alternative packaging.

Q: What is the moisture sensitivity level for both parts?

A: Both parts carry MSL 2 (1 Year) rating, indicating identical moisture handling and storage requirements. Standard moisture control procedures for MSL 2 components apply to both parts.

Q: Why is the original part obsolete?

A: The ASMT-QBBC-NAC0E is classified as obsolete by Broadcom Limited. The ASMT-QBB3-NBD0E represents the active product line continuation with equivalent electrical and optical performance, ensuring long-term design support and supply availability.