SLI-343YY3F Equivalent & Substitute Parts

Part Overview

The SLI-343YY3F is a yellow diffused T-1 through-hole LED manufactured by Rohm Semiconductor, designed for indication applications. This active product delivers 300mcd at 1.9V forward voltage with a 587nm dominant wavelength and 40° viewing angle. The diffused lens provides uniform light distribution suitable for general indication purposes. Substitute parts are identified based on matching electrical characteristics, mechanical compatibility, and package specifications to ensure functional equivalence in circuit applications.

Substiute Parts

SLI-343YY3F

Rohm SemiconductorIn Stock: 2806SLI-343YY3F Datasheet

Current PartRFQ

WP710A10SYT

KingbrightIn Stock: 2039WP710A10SYT Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SLI-343YY3F is determined by the following critical parameters:

• Color: Yellow (587nm–590nm wavelength range acceptable)
• Mounting Type: Through Hole Radial configuration
• Package: T-1 form factor
• Voltage Range: Forward voltage 1.9V–2.0V
• Current Rating: 20mA test current compatibility
• Lens Configuration: Round domed top, 3mm–3.10mm diameter
• Compliance: ROHS3 Compliant, REACH Unaffected, MSL 1

The WP710A10SYT from Kingbright meets these substitution criteria with compatible electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

Both the SLI-343YY3F and WP710A10SYT are active products with full ROHS3 compliance and REACH unaffected status, suitable for current production designs. Selection between these parts depends on application-specific requirements:

The SLI-343YY3F provides diffused lens optics with 300mcd output and a wider 40° viewing angle, appropriate for applications requiring distributed light emission and lower intensity.

The WP710A10SYT offers clear lens optics with 1200mcd output and a narrower 34° viewing angle, suitable for applications requiring concentrated light output and higher brightness. The forward voltage difference of 0.1V (1.9V vs. 2.0V) is within typical circuit design tolerances for series resistor adjustment.

Both parts maintain identical 20mA test current ratings and T-1 through-hole radial packaging, ensuring mechanical and electrical compatibility in standard PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can WP710A10SYT directly replace SLI-343YY3F without circuit modification?

A: Direct mechanical and electrical substitution is possible. The 0.1V forward voltage difference requires minor resistor adjustment in current-limiting circuits. The higher brightness (1200mcd vs. 300mcd) and clear lens (vs. diffused) alter light distribution characteristics and must be evaluated for the specific application.

Q: What is the difference between diffused and clear lens types?

A: Diffused lenses scatter light uniformly across a wider viewing angle (40° for SLI-343YY3F), producing softer illumination. Clear lenses concentrate light in a narrower beam (34° for WP710A10SYT), producing brighter, more directional output. Application requirements determine which is appropriate.

Q: Are both parts suitable for new designs?

A: Yes. Both parts carry Active product status with current manufacturing support and full compliance certifications (ROHS3, REACH Unaffected, MSL 1).

Q: What are the mechanical compatibility constraints?

A: Both parts use T-1 through-hole radial packaging with round domed tops. Lens diameters are 3.10mm (SLI-343YY3F) and 3.00mm (WP710A10SYT), and maximum heights are 5.60mm and 5.90mm respectively. These dimensions are compatible with standard T-1 PCB footprints.

Q: How do wavelength specifications affect substitution?

A: Both parts emit yellow light within the 587nm–590nm range, which is visually indistinguishable to the human eye. This wavelength compatibility confirms functional equivalence for indication applications.