Equivalent & Substitute Parts for R4YD LED Yellow Diffused Through-Hole

Part Overview

The R4YD is a yellow LED indication component manufactured by Bivar Inc., designed for discrete 2V radial through-hole applications. This part features a diffused rectangular lens (4.00mm x 2.00mm) with a 6mcd brightness rating and 120° viewing angle, suitable for standard LED indication circuits.

The R4YD is classified as obsolete. Identifying compatible substitute parts is necessary to maintain design continuity and ensure component availability for production, maintenance, and repair applications.

Substiute Parts

R4YD

Bivar Inc.In Stock: 1105R4YD Datasheet

Current PartRFQ

R4AD

Bivar Inc.In Stock: 1108R4AD Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the R4YD are identified based on the following critical parameters that determine functional compatibility:

Electrical Parameters:

• Forward voltage (Vf): 2V
• Test current: 20mA
• Millicandela rating: 6mcd

Mechanical Parameters:

• Mounting type: Through Hole
• Lens size: 4.00mm x 2.00mm
• Lens style: Rectangle with Flat Top
• Height (Max): 7.00mm
• Package type: Radial

Environmental Parameters:

• Moisture Sensitivity Level: 1 (Unlimited)
• Viewing angle: 120°

The R4AD meets all critical electrical and mechanical parameters. The primary difference is the lens color (amber vs. yellow) and peak wavelength (605nm vs. 590nm), which reflects the different light emission characteristics while maintaining identical electrical performance and physical form factor.

Parameter Comparison

Engineering Selection Recommendations

The R4AD is an active product with ROHS3 compliance, whereas the R4YD is obsolete. Both components share identical electrical specifications (2V forward voltage, 20mA test current, 6mcd brightness) and mechanical form factors (through-hole radial package, 4.00mm x 2.00mm lens, 7.00mm maximum height).

The substitution is valid from an electrical and mechanical standpoint. The R4AD operates at 605nm peak wavelength (amber) compared to the R4YD at 590nm (yellow), resulting in a visible color difference in the emitted light. This distinction must be evaluated against application requirements for indicator color coding or visual distinction.

The R4AD's active product status and ROHS3 compliance provide advantages for new designs and long-term supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the R4AD directly replace the R4YD in existing designs?

A: The R4AD is electrically and mechanically compatible with the R4YD. Both components have identical forward voltage (2V), test current (20mA), brightness (6mcd), viewing angle (120°), and physical dimensions. The primary difference is the emitted light color: amber (R4AD) versus yellow (R4YD). Substitution is valid if the application does not require specific yellow light emission for color-coded indication purposes.

Q: What are the key parameters that determine substitution compatibility?

A: Substitution compatibility is determined by: forward voltage (2V), test current (20mA), millicandela rating (6mcd), mounting type (through-hole radial), lens dimensions (4.00mm x 2.00mm), lens style (rectangle with flat top), maximum height (7.00mm), viewing angle (120°), and moisture sensitivity level (MSL 1). All these parameters are identical between the R4YD and R4AD.

Q: Why is the R4YD obsolete while the R4AD is active?

A: Product status reflects manufacturer production and support decisions. The R4AD remains in active production by Bivar Inc., ensuring availability and supply chain reliability. The R4YD has been discontinued. For new applications or component replenishment, the R4AD is the recommended choice.

Q: Are there any compliance differences between these parts?

A: The R4AD is ROHS3 compliant. RoHS status for the R4YD is not specified in available documentation. Both components have MSL 1 (Unlimited) moisture sensitivity rating and are classified under ECCN EAR99 and HTSUS 8541.41.0000.

Q: What is the impact of the wavelength difference (590nm vs. 605nm)?

A: The wavelength difference reflects the distinct light emission characteristics. The R4YD emits at 590nm (yellow spectrum), while the R4AD emits at 605nm (amber spectrum). In visual applications, this produces a perceptible color difference. Applications requiring specific yellow indication must evaluate whether amber light is acceptable for their intended function.

Q: Can both parts be used interchangeably in the same circuit?

A: From an electrical standpoint, yes. Both components operate at 2V forward voltage and 20mA test current, making them functionally equivalent in circuit design. However, the visual output differs due to wavelength variation. Circuit-level substitution is valid; visual indication substitution depends on application requirements.