SLI-343DU3F Equivalent & Substitute Parts

Part Overview

The SLI-343DU3F is an orange diffused T-1 through-hole LED manufactured by Rohm Semiconductor, designed for indication applications with a dominant wavelength of 605nm. This component is classified as Not For New Designs, making identification of functionally equivalent alternatives essential for ongoing production support and design updates. The part operates at 1.9V forward voltage with a 350mcd brightness rating and 40° viewing angle in a standard radial package configuration.

Substiute Parts

SLI-343DU3F

Rohm SemiconductorIn Stock: 4745SLI-343DU3F Datasheet

Current PartRFQ

WP710A10SET

KingbrightIn Stock: 1039WP710A10SET Datasheet

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WP710A10SYT

KingbrightIn Stock: 2039WP710A10SYT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SLI-343DU3F is determined by the following critical parameters:

Primary Compatibility Criteria:

• Mounting Type: Through Hole (Radial package required)
• Package / Case: Radial T-1 configuration
• Color: Orange wavelength range (590nm–610nm acceptable)
• Voltage - Forward (Vf): 1.9V–2.0V operating range
• Current - Test: 20mA standard test condition
• RoHS Status: ROHS3 Compliant minimum

Secondary Consideration:

• Lens Transparency: Diffused or Clear acceptable based on application requirements
• Millicandela Rating: 350mcd minimum for indication applications
• Viewing Angle: 34°–40° range suitable for standard indication use

The substitute parts identified meet the core electrical and mechanical requirements for direct replacement in through-hole LED indication circuits. Lens transparency differences (diffused vs. clear) represent the primary functional variation among qualified substitutes.

Parameter Comparison

Engineering Selection Recommendations

WP710A10SET (Kingbright Orange Clear T-1): This part provides the closest spectral match to the SLI-343DU3F with a dominant wavelength of 601nm within the orange range. The forward voltage increases from 1.9V to 2V, requiring circuit verification for current-limiting resistor adjustment. The clear lens transparency differs from the diffused original, resulting in higher brightness concentration (800mcd vs. 350mcd) and narrower viewing angle (34° vs. 40°). This substitute is suitable for applications where increased brightness and directional output are acceptable. Active product status ensures long-term availability.

WP710A10SYT (Kingbright Yellow Clear T-1): This part operates at the same electrical parameters as WP710A10SET (2V forward voltage, 20mA test current) but shifts the dominant wavelength to 590nm (yellow spectrum). The 1200mcd brightness rating provides significantly higher output than the original. This substitute is applicable only when yellow indication is functionally equivalent to orange in the circuit design. Active product status supports production continuity.

Both substitutes maintain through-hole radial package compatibility, ROHS3 compliance, and standard T-1 form factor. Forward voltage increase from 1.9V to 2V requires verification of series resistor values in the LED drive circuit to maintain proper current limiting.

Frequently Asked Questions (FAQ)

Q: Can WP710A10SET directly replace SLI-343DU3F without circuit modification?

A: Direct mechanical and electrical substitution is possible with circuit verification. The forward voltage increases from 1.9V to 2V, requiring recalculation of the series current-limiting resistor. The clear lens produces higher brightness concentration compared to the diffused original, and the viewing angle narrows from 40° to 34°. Verify that these optical characteristics are acceptable for the application before implementation.

Q: What is the primary difference between WP710A10SET and WP710A10SYT?

A: The primary difference is color specification. WP710A10SET produces orange light at 601nm dominant wavelength, while WP710A10SYT produces yellow light at 590nm dominant wavelength. Both share identical electrical parameters (2V forward voltage, 20mA test current) and package configuration. Selection depends on whether the application requires orange or yellow indication.

Q: Are the Kingbright substitutes compatible with the original PCB footprint?

A: Yes. Both WP710A10SET and WP710A10SYT use radial T-1 through-hole packages with dimensions compatible with the SLI-343DU3F footprint. Lens diameter is 3mm (WP710 series) versus 3.10mm (SLI-343DU3F), representing a negligible mechanical difference. Height specifications (5.90mm vs. 5.60mm) are within standard PCB clearance tolerances.

Q: Why does the brightness (mcd) differ significantly among these parts?

A: Millicandela rating reflects the luminous intensity at the specified test current (20mA). The SLI-343DU3F produces 350mcd with a diffused lens, which spreads light over a wider 40° viewing angle. The Kingbright substitutes (800mcd and 1200mcd) use clear lenses that concentrate light into narrower 34° viewing angles, resulting in higher intensity in the forward direction. Application requirements determine whether increased brightness is beneficial or problematic.

Q: Are all three parts RoHS3 compliant?

A: Yes. The SLI-343DU3F, WP710A10SET, and WP710A10SYT are all ROHS3 Compliant, meeting current environmental and material restriction standards. This compliance is maintained across all substitute options.

Q: What is the impact of changing from diffused to clear lens?

A: Diffused lenses scatter light uniformly across the viewing angle, producing softer, more dispersed illumination. Clear lenses concentrate light in the forward direction, producing brighter but more directional output. The SLI-343DU3F diffused lens provides 350mcd across 40°, while WP710A10SET clear lens provides 800mcd across 34°. Application visibility requirements and viewing geometry determine which lens type is appropriate.