Equivalent & Substitute Parts for R4BWD

Part Overview

The R4BWD is a blue diffused through-hole LED manufactured by Bivar Inc., designed for discrete LED indication applications. This component features a 4V forward voltage rating, 6mcd brightness output, and a rectangular lens form factor (4.00mm x 2.00mm). The R4BWD is classified as obsolete, making identification of compatible substitute components essential for ongoing design support and production continuity.

Substiute Parts

R4BWD

Bivar Inc.In Stock: 1024R4BWD Datasheet

Current PartRFQ

R4GD

Bivar Inc.In Stock: 1043R4GD Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The R4BWD is listed with one substitute component: R4GD. Substitution eligibility is determined by the following parameters that must remain compatible across the main part and substitute:

Compatible Parameters (Substitution Allowed):

• Mounting Type: Through Hole (radial configuration maintained)
• Lens Style: Rectangle with Flat Top
• Lens Size: 4.00mm x 2.00mm
• Current - Test: 20mA
• Viewing Angle: 120°
• Height (Max): 7.00mm
• Moisture Sensitivity Level (MSL): 1 (Unlimited)
• Package / Case: Radial

Variable Parameters (Differ Between Parts):

• Color: Blue (R4BWD) vs. Green (R4GD)
• Voltage - Forward (Vf): 4V (R4BWD) vs. 2.1V (R4GD)
• Millicandela Rating: 6mcd (R4BWD) vs. 8mcd (R4GD)
• Wavelength - Peak: 430nm (R4BWD) vs. 568nm (R4GD)
• Product Status: Obsolete (R4BWD) vs. Active (R4GD)

The R4GD serves as a substitute when the application permits color and voltage specification changes while maintaining identical mechanical form factor and electrical test parameters.

Parameter Comparison

Engineering Selection Recommendations

R4BWD Status Consideration: The R4BWD is classified as obsolete. The R4GD is the identified substitute and maintains active product status with Bivar Inc., ensuring ongoing availability and supply chain continuity.

Compliance and Certifications: Both R4BWD and R4GD share identical export control classifications (ECCN: EAR99) and tariff codes (HTSUS: 8541.41.0000). The R4GD carries RoHS3 compliance certification, providing additional regulatory alignment for new designs.

Mechanical Compatibility: The R4GD maintains identical mechanical specifications: lens size (4.00mm x 2.00mm), lens style (rectangle with flat top), mounting type (through hole radial), and maximum height (7.00mm). Direct PCB footprint compatibility is preserved.

Electrical Parameter Differences: Selection of R4GD requires circuit design accommodation for the following differences:

• Forward voltage reduction from 4V to 2.1V
• Brightness increase from 6mcd to 8mcd
• Color shift from blue (430nm peak wavelength) to green (568nm peak wavelength)

These differences necessitate application-specific evaluation to confirm suitability for the intended indication function.

Frequently Asked Questions (FAQ)

Q: Can R4GD be used as a direct replacement for R4BWD without circuit modification?

A: R4GD maintains identical mechanical form factor and mounting compatibility. However, the forward voltage differs (2.1V vs. 4V), requiring circuit design review to ensure proper current limiting and voltage supply compatibility. The color change from blue to green must also be functionally acceptable for the application.

Q: What are the key mechanical compatibility factors between R4BWD and R4GD?

A: Both components share identical lens dimensions (4.00mm x 2.00mm), lens style (rectangle with flat top), mounting type (through hole radial), and maximum height (7.00mm). PCB footprint and mechanical envelope are identical.

Q: Why does the R4GD have a lower forward voltage than the R4BWD?

A: Forward voltage is determined by the LED semiconductor material and color. Green LEDs (568nm wavelength) inherently operate at lower forward voltages than blue LEDs (430nm wavelength). This is a fundamental material property and not a design variable.

Q: Is the R4GD brighter than the R4BWD?

A: The R4GD has a higher millicandela rating (8mcd vs. 6mcd), indicating greater luminous intensity. However, perceived brightness depends on application context, viewing angle, and human eye sensitivity to different wavelengths.

Q: What is the significance of the R4GD's active product status compared to the R4BWD's obsolete status?

A: Active product status indicates ongoing manufacturing and supply availability. The obsolete R4BWD may face supply constraints or discontinuation. The R4GD provides a path to sustained component availability for designs requiring this form factor and electrical class.

Q: Are there any compliance differences between R4BWD and R4GD?

A: Both components share identical export control (ECCN: EAR99) and tariff classifications (HTSUS: 8541.41.0000). The R4GD carries RoHS3 compliance certification, which may be required for certain regulatory jurisdictions or customer specifications.

Q: What packaging options are available for the R4GD?

A: The R4GD is supplied in bulk packaging, whereas the R4BWD packaging specification was not provided in the available data.