L131DY Yellow LED T-1 3/4 Through Hole - Equivalent & Substitute Parts

Part Overview

The L131DY is a yellow diffused LED manufactured by Visual Communications Company (VCC) in the T-1 3/4 (5mm) through-hole package. This component functions as a yellow LED indicator for discrete 2.1V radial applications. The L131DY is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement continuity. Substitute parts must maintain identical electrical performance, mechanical compatibility, and optical characteristics to ensure direct replacement without circuit redesign.

Key Parameters

Parameter	Value	Criticality for Substitution
Color	Yellow	Critical
Lens Transparency	Diffused	Critical
Lens Size / Package	T-1 3/4 (5mm)	Critical
Mounting Type	Through Hole Radial	Critical
Voltage - Forward (Vf) Typical	2.1V	Critical
Current - Test	20mA	Critical
Millicandela Rating	20mcd	Critical
Viewing Angle	60°	Critical
Wavelength - Peak	590nm	Important
Lens Style	Round with Domed Top	Important
RoHS Status	ROHS3 Compliant	Important

Substitute Part Grouping Explanation

Substitute parts for the L131DY are identified based on strict equivalence across the following parameters:

Critical Matching Parameters:

Color: Yellow
Lens Transparency: Diffused
Package: T-1 3/4 (5mm) through-hole radial
Forward Voltage (Vf): 2.1V nominal
Test Current: 20mA
Luminous Intensity: 20mcd
Viewing Angle: 60°

Important Matching Parameters:

Lens Style: Round with domed top
Peak Wavelength: 590nm nominal (±5nm acceptable)
RoHS3 Compliance
REACH Unaffected status

The SSL-LX5063YD from Lumex Opto/Components Inc. meets all critical and important parameters and qualifies as a direct substitute. This part is currently in active production status, providing long-term availability compared to the obsolete L131DY.

Parameter Comparison

Parameter	L131DY (VCC)	SSL-LX5063YD (Lumex)	Match Status
Color	Yellow	Yellow	Equivalent
Lens Transparency	Diffused	Diffused	Equivalent
Lens Size / Package	T-1 3/4 (5mm)	T-1 3/4 (5mm)	Equivalent
Mounting Type	Through Hole Radial	Through Hole Radial	Equivalent
Voltage - Forward (Vf) Typical	2.1V	2.1V	Equivalent
Current - Test	20mA	20mA	Equivalent
Millicandela Rating	20mcd	20mcd	Equivalent
Viewing Angle	60°	60°	Equivalent
Wavelength - Peak	590nm	585nm	Within Tolerance
Lens Style	Round with Domed Top	Round with Domed Top	Equivalent
Height (Max)	8.61mm	6.00mm	Compatible
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent
Product Status	Obsolete	Active	Substitute Advantage

Engineering Selection Recommendations

Primary Substitute: SSL-LX5063YD

The SSL-LX5063YD is the qualified substitute for the obsolete L131DY based on the following engineering criteria:

Electrical Equivalence: Forward voltage (2.1V), test current (20mA), and luminous intensity (20mcd) are identical across both parts.
Optical Equivalence: Both parts feature yellow diffused lenses with 60° viewing angles. Peak wavelength variance (590nm vs. 585nm) is within acceptable tolerance for yellow LED indication applications.
Mechanical Compatibility: Both parts use T-1 3/4 (5mm) through-hole radial packages with round domed-top lens styles. The SSL-LX5063YD height (6.00mm maximum) is lower than the L131DY (8.61mm maximum), ensuring compatibility with existing PCB layouts and mechanical clearances.
Compliance and Availability: The SSL-LX5063YD maintains ROHS3 compliance and REACH unaffected status. Active production status ensures long-term availability and supply chain stability compared to the obsolete L131DY.
Packaging: The SSL-LX5063YD is supplied in bulk packaging, suitable for production environments.

Frequently Asked Questions (FAQ)

Q: Can the SSL-LX5063YD replace the L131DY in existing designs without modification?

A: Yes. The SSL-LX5063YD is electrically and mechanically equivalent to the L131DY. Both parts share identical forward voltage (2.1V), test current (20mA), luminous intensity (20mcd), viewing angle (60°), and T-1 3/4 through-hole radial package configuration. No circuit redesign is required.

Q: What is the significance of the peak wavelength difference (590nm vs. 585nm)?

A: The 5nm difference falls within the acceptable tolerance band for yellow LED indication applications. Both wavelengths produce visually equivalent yellow light output and are suitable for the same indicator applications.

Q: Is the lower height of the SSL-LX5063YD (6.00mm vs. 8.61mm) a concern?

A: No. The lower height of the SSL-LX5063YD is compatible with existing PCB layouts. The reduced height provides additional mechanical clearance and does not affect electrical performance or optical characteristics.

Q: Why is the L131DY classified as obsolete?

A: The L131DY is no longer in active production. The SSL-LX5063YD provides equivalent functionality with the advantage of active manufacturing status and assured long-term availability.

Q: Are there any compliance differences between the two parts?

A: Both parts are ROHS3 compliant and REACH unaffected. Compliance status is equivalent across both components.

Q: What packaging options are available for the SSL-LX5063YD?

A: The SSL-LX5063YD is supplied in bulk packaging, suitable for production assembly environments.

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