SLR-343YC3F Yellow LED Through-Hole Equivalent & Substitute Parts

Part Overview

The SLR-343YC3F is a yellow LED indication component manufactured by Rohm Semiconductor, designed for through-hole mounting applications. This part features a 3.10mm round domed lens with clear transparency, delivering 16mcd at 2.1V forward voltage. The component is classified as "Not For New Designs," making identification of active equivalent and substitute parts essential for ongoing production support and design updates. Substitute parts must maintain compatibility across mounting type, electrical characteristics, and physical dimensions while preferring components with active product status.

Substiute Parts

SLR-343YC3F

Rohm SemiconductorIn Stock: 1644SLR-343YC3F Datasheet

Current PartRFQ

151031YS06000

Würth ElektronikIn Stock: 2948151031YS06000 Datasheet

SimilarRFQ

LTL-4256N

Lite-On Inc.In Stock: 924LTL-4256N Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SLR-343YC3F is determined by the following mandatory parameters:

• Mounting Type: Must be Through Hole (radial configuration)
• Color: Must be Yellow
• Voltage - Forward (Vf): Acceptable range 2.0V to 2.1V
• Current - Test: Acceptable range 10mA to 20mA
• Lens Size: 3.0mm to 3.10mm diameter
• Package / Case: Radial
• RoHS Status: ROHS3 Compliant minimum

The identified substitute parts meet these criteria while offering improved product status (Active) and maintained compliance certifications. Lens transparency and millicandela ratings may vary within acceptable operational parameters for indication applications.

Parameter Comparison

Engineering Selection Recommendations

151031YS06000 (Würth Elektronik)

This substitute offers active product status with ROHS3 compliance. The diffused lens transparency provides wider light distribution (60° viewing angle) compared to the clear lens of the main part. Forward voltage is 0.1V lower (2V vs 2.1V), and test current is doubled (20mA vs 10mA). Millicandela rating is significantly higher (110mcd vs 16mcd), making this suitable for applications requiring increased brightness. Lens size is 3.00mm, within acceptable tolerance of the 3.10mm main part. Height is 5.55mm, within specification range.

LTL-4256N (Lite-On Inc.)

This substitute maintains active product status with ROHS3 compliance and REACH Affected designation. Forward voltage (2.1V) and test current (10mA) match the main part exactly. Clear lens transparency is identical to the main part. Millicandela rating is 40mcd, providing 2.5x brightness increase. Viewing angle is 45°, slightly wider than the main part's 40°. Lens size is 3mm T-1 package, compatible with 3.10mm mounting. Height is 5.85mm, within acceptable range. This part represents the closest electrical and optical match to the SLR-343YC3F.

Frequently Asked Questions (FAQ)

Q: Can I use 151031YS06000 as a direct replacement for SLR-343YC3F?

A: Yes, with design considerations. The Würth part is electrically compatible (2V forward voltage, 20mA test current) and maintains through-hole radial mounting. The diffused lens provides wider viewing angle (60° vs 40°) and higher brightness (110mcd vs 16mcd). Circuit design must accommodate the doubled test current specification.

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

A: Clear lenses provide focused, directional light output with narrower viewing angles. Diffused lenses scatter light across a wider area, increasing viewing angle but reducing peak brightness in the direct viewing direction. The SLR-343YC3F uses clear transparency; 151031YS06000 uses diffused transparency.

Q: Are both substitute parts suitable for new designs?

A: Yes. Both 151031YS06000 and LTL-4256N carry Active product status, making them appropriate for new design implementations. The main part (SLR-343YC3F) is marked "Not For New Designs" and should be replaced in new applications.

Q: How do I select between the two substitute options?

A: LTL-4256N provides the closest electrical match (identical Vf and test current) with clear lens transparency matching the main part. 151031YS06000 offers higher brightness and wider viewing angle but requires circuit adjustment for doubled test current. Selection depends on application brightness requirements and circuit design constraints.

Q: Are there compliance differences between the substitutes?

A: Both substitutes are ROHS3 compliant. LTL-4256N carries REACH Affected status, while 151031YS06000 is REACH Unaffected. Application regulatory requirements determine which compliance profile is necessary.

Q: Can I use these parts interchangeably in existing PCB designs?

A: Physical compatibility exists (through-hole radial mounting, similar heights within 5.55mm to 5.85mm range). Electrical compatibility requires verification of circuit current-handling capacity, particularly for 151031YS06000 which specifies 20mA test current versus the main part's 10mA. Optical performance differences (brightness, viewing angle) may affect application visibility requirements.