SLR-56YC3F Yellow LED T-1 3/4 Through Hole Equivalent & Substitute Parts

Part Overview

The SLR-56YC3F is an active yellow LED indicator from Rohm Semiconductor, designed for discrete indication applications in through-hole mounting configurations. This T-1 3/4 (5mm) package yellow LED operates at 2.1V forward voltage with a 25mcd brightness rating and clear lens transparency. The part is ROHS3 compliant and maintains unlimited moisture sensitivity rating (MSL 1). Equivalent and substitute parts are identified based on matching mechanical form factor, electrical operating parameters, and optical characteristics to ensure direct circuit compatibility.

Substiute Parts

SLR-56YC3F

Rohm SemiconductorIn Stock: 1709SLR-56YC3F Datasheet

Current PartRFQ

HLMP-3451

Broadcom LimitedIn Stock: 20873HLMP-3451 Datasheet

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HLMP-3451-D0000

Broadcom LimitedIn Stock: 22968HLMP-3451-D0000 Datasheet

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SSL-LX5093YT

Lumex Opto/Components Inc.In Stock: 12329SSL-LX5093YT Datasheet

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WP7113YT

KingbrightIn Stock: 15396WP7113YT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SLR-56YC3F are grouped based on the following critical parameters that determine functional compatibility:

Primary Matching Criteria:

• Color: Yellow
• Lens Size: 5mm, T-1 3/4
• Mounting Type: Through Hole
• Package / Case: Radial
• Voltage - Forward (Vf): 2.0V to 2.1V range
• Configuration: Standard

Secondary Compatibility Factors:

• Wavelength range: 583nm to 590nm (yellow spectrum)
• Current - Test: 10mA to 20mA
• RoHS Status: ROHS3 Compliant
• Product Status: Active

Substitutes are divided into two categories based on lens transparency:

Category A - Clear Lens (Direct Optical Match): SSL-LX5093YT and WP7113YT maintain clear lens transparency matching the SLR-56YC3F optical characteristics.

Category B - Diffused Lens (Optical Variation): HLMP-3451 and HLMP-3451-D0000 feature diffused lens transparency, altering light distribution characteristics while maintaining electrical compatibility.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Clear Lens, Matched Brightness): SSL-LX5093YT and WP7113YT are suitable direct substitutes when optical characteristics must remain consistent with the SLR-56YC3F. Both maintain clear lens transparency and operate within the 2.1V forward voltage specification. SSL-LX5093YT provides 40mcd brightness with a 30° viewing angle, while WP7113YT delivers 80mcd brightness with a 20° viewing angle. Selection between these depends on required brightness and viewing angle constraints.

For Brightness-Reduced Applications: HLMP-3451 and HLMP-3451-D0000 operate at 2.0V forward voltage with significantly reduced brightness (3.6mcd) and diffused lens characteristics. These parts are suitable only when lower brightness output and wider light distribution (50° viewing angle) are acceptable design requirements. The 0.1V lower forward voltage may require circuit resistor adjustment.

For Height-Constrained PCB Layouts: HLMP-3451 and HLMP-3451-D0000 feature reduced maximum height (6.35mm) compared to the SLR-56YC3F (8.90mm), making them suitable for applications with vertical space limitations.

Compliance Verification: All substitute parts maintain ROHS3 compliance and active product status, ensuring regulatory alignment and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can HLMP-3451 or HLMP-3451-D0000 be used as direct replacements for SLR-56YC3F? A: Electrical substitution is possible due to matching 5mm T-1 3/4 package, through-hole radial mounting, and compatible forward voltage (2.0V vs. 2.1V). However, optical characteristics differ significantly: brightness reduces from 25mcd to 3.6mcd, and lens transparency changes from clear to diffused. Circuit redesign may be required if brightness output is critical to application function.

Q: What is the impact of forward voltage difference between SLR-56YC3F (2.1V) and HLMP-3451 (2.0V)? A: The 0.1V difference is within typical LED tolerance ranges. In series-resistor-limited circuits, this may result in slightly increased current flow through the LED. Verify that the series resistor value accommodates the lower forward voltage without exceeding maximum rated current (typically 20mA for these packages).

Q: How do viewing angle differences affect substitution suitability? A: SLR-56YC3F provides 40° viewing angle. SSL-LX5093YT (30°) offers narrower light distribution, suitable for focused indication. WP7113YT (20°) provides the most concentrated beam. HLMP-3451 and HLMP-3451-D0000 (50°) provide the widest distribution. Select based on application visibility requirements and observer position constraints.

Q: Are there height restrictions that favor specific substitutes? A: SLR-56YC3F maximum height is 8.90mm. HLMP-3451 and HLMP-3451-D0000 are shorter at 6.35mm, suitable for space-constrained designs. SSL-LX5093YT and WP7113YT match the original height at 8.60mm. Verify PCB clearance requirements before selection.

Q: Do all substitute parts maintain the same wavelength specification? A: Wavelength varies across substitutes. SLR-56YC3F dominant wavelength is 587nm. HLMP-3451 series peaks at 583nm, SSL-LX5093YT peaks at 585nm, and WP7113YT peaks at 590nm. All remain within the yellow spectrum (580nm–595nm). Verify that application color perception requirements are met by the selected substitute.

Q: What is the difference between HLMP-3451 and HLMP-3451-D0000? A: Both parts are electrically and optically identical. HLMP-3451-D0000 is a variant designation from Broadcom Limited. Selection between them depends on supplier availability and inventory status. Electrical and mechanical specifications are equivalent.