SLI-343URCT31 Equivalent & Substitute Parts

Part Overview

The SLI-343URCT31 is a red diffused through-hole LED manufactured by Rohm Semiconductor, designed for indication applications with a dominant wavelength of 620nm and a forward voltage of 1.9V at 20mA test current. This part is classified as "Not For New Designs," making identification of functionally equivalent alternatives necessary for ongoing production support and component sourcing flexibility.

Substiute Parts

SLI-343URCT31

Rohm SemiconductorIn Stock: 1012SLI-343URCT31 Datasheet

Current PartRFQ

EALP03RDGRA0

Everlight Electronics Co LtdIn Stock: 1109EALP03RDGRA0 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SLI-343URCT31 is determined by the following critical parameters:

• Color and Wavelength: Red indication LEDs with dominant wavelengths in the 620-624nm range maintain visual compatibility
• Mounting Type: Through-hole radial configuration required for PCB compatibility
• Lens Characteristics: Diffused lens with round domed top maintains optical performance
• Electrical Parameters: Forward voltage (1.9V-2.0V) and test current (20mA) define circuit compatibility
• Mechanical Fit: Lens diameter (3.00-3.10mm) and maximum height (5.20-5.60mm) ensure physical compatibility
• Compliance: ROHS3 compliance and EAR99 classification maintained across substitutes

The EALP03RDGRA0 from Everlight Electronics Co Ltd qualifies as a substitute based on alignment across these parameters.

Parameter Comparison

Engineering Selection Recommendations

The EALP03RDGRA0 is suitable as a substitute for the SLI-343URCT31 based on the following factors:

• Product Status: The EALP03RDGRA0 maintains Active status, ensuring continued availability and manufacturing support, whereas the SLI-343URCT31 is designated Not For New Designs
• Compliance Alignment: Both parts maintain ROHS3 compliance and EAR99 classification, satisfying regulatory requirements
• Electrical Compatibility: Forward voltage differential of 0.1V (1.9V vs 2.0V) at identical 20mA test current falls within typical circuit tolerance ranges for LED indication applications
• Optical Performance: Dominant wavelength variance of 4nm (620nm vs 624nm) remains within the red spectrum for visual indication purposes; increased millicandela rating (500mcd vs 450mcd) provides enhanced brightness margin
• Mechanical Fit: Lens diameter reduction of 0.10mm and height reduction of 0.40mm maintain compatibility with standard 3mm LED mounting footprints

Frequently Asked Questions (FAQ)

Q: Can the EALP03RDGRA0 directly replace the SLI-343URCT31 in existing designs?

A: Yes. Both parts share identical mounting type (through-hole radial), lens transparency (diffused), test current (20mA), and compliance certifications. The forward voltage difference of 0.1V and wavelength difference of 4nm are within acceptable ranges for indication LED applications.

Q: What is the impact of the 0.1V forward voltage difference?

A: In series-resistor LED circuits, a 0.1V difference requires minimal adjustment to current-limiting resistor values. For a 20mA design, this represents approximately 5% variance and is typically accommodated by standard resistor tolerances.

Q: Does the reduced viewing angle (30° vs 40°) affect compatibility?

A: Viewing angle reduction from 40° to 30° narrows the optimal viewing cone. Applications requiring wide-angle visibility should evaluate this parameter against specific design requirements.

Q: Are there packaging differences between these parts?

A: Yes. The SLI-343URCT31 is supplied in Tape & Box (TB) packaging, while the EALP03RDGRA0 is supplied in Bulk packaging. Procurement and handling procedures may differ accordingly.

Q: Why is the SLI-343URCT31 marked "Not For New Designs"?

A: This designation indicates the part is in mature or end-of-life status. The EALP03RDGRA0, with Active product status, is recommended for new design implementations requiring long-term component availability.