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SLR-342YYT32 Equivalent & Substitute Parts
Part Overview
The SLR-342YYT32 is a yellow diffused T-1 through-hole LED manufactured by Rohm Semiconductor, designed for indication applications with a 587nm dominant wavelength and 10mcd brightness rating. This part is classified as "Not For New Designs," indicating it has been superseded in Rohm's product line. Finding equivalent and substitute parts is necessary for ongoing maintenance, repair, and legacy system support where this component remains in active use.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | SLR-342YYT32 |
| Manufacturer | Rohm Semiconductor |
| Color | Yellow |
| Lens Transparency | Diffused |
| Lens Size | 3.10mm Dia |
| Mounting Type | Through Hole |
| Package / Case | Radial |
| Supplier Device Package | T-1 |
| Voltage - Forward (Vf) (Typ) | 2.1V |
| Current - Test | 10mA |
| Millicandela Rating | 10mcd |
| Viewing Angle | 40° |
| Wavelength - Dominant | 587nm |
| Height (Max) | 5.40mm |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the SLR-342YYT32 is determined by the following critical parameters:
- Color: Yellow (all substitutes must be yellow)
- Mounting Type: Through Hole (radial configuration)
- Package / Case: Radial T-1 form factor
- Lens Transparency: Diffused
- Voltage - Forward (Vf): 2.0V to 2.1V nominal range
- Current - Test: 10mA to 20mA operating range
- Wavelength: 585nm to 591nm (yellow spectrum)
- Compliance: ROHS3 Compliant, MSL 1
Substitute parts are grouped into two categories:
Parametric Equivalent: Parts with nearly identical electrical and mechanical specifications, differing only in minor parameters such as peak wavelength or height tolerance.
Similar Parts: Parts meeting core substitution criteria (color, mounting, package, voltage range, compliance) but with variations in brightness (millicandela rating), viewing angle, or test current that may affect circuit performance.
Parameter Comparison
| Parameter | SLR-342YYT32 | SLR-343YYT32 | 1254-10UYD/S530-A3 | 151031YS05900 | 264-7UYD/S530-A3 | 3YD-F | 3YDL-F |
|---|---|---|---|---|---|---|---|
| Manufacturer | Rohm Semiconductor | Rohm Semiconductor | Everlight Electronics | Würth Elektronik | Everlight Electronics | Bivar Inc. | Bivar Inc. |
| Color | Yellow | Yellow | Yellow | Yellow | Yellow | Yellow | Yellow |
| Lens Transparency | Diffused | Diffused | Diffused | Diffused | Diffused | Diffused | Diffused |
| Lens Size | 3.10mm Dia | 3.10mm Dia | 3.00mm Dia | 3.00mm Dia | 2.90mm Dia | 3mm, T-1 | 3mm, T-1 |
| Mounting Type | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole |
| Package / Case | Radial | Radial | Radial | Radial | Radial | Radial | Radial |
| Supplier Device Package | T-1 | T-1 | 3.0mm Round | 3mm Round | 3.0mm Round | T-1 | T-1 |
| Voltage - Forward (Vf) (Typ) | 2.1V | 2.1V | 2V | 2.1V | 2V | 2V | 2V |
| Current - Test | 10mA | 10mA | 20mA | 20mA | 20mA | 20mA | 2mA |
| Millicandela Rating | 10mcd | 10mcd | 200mcd | 30mcd | 125mcd | 20mcd | 2mcd |
| Viewing Angle | 40° | 40° | 30° | 60° | 60° | 35° | 35° |
| Wavelength - Dominant | 587nm | — | 589nm | 590nm | 589nm | — | — |
| Wavelength - Peak | — | 585nm | 591nm | 585nm | 591nm | 590nm | 590nm |
| Height (Max) | 5.40mm | 5.60mm | 5.20mm | 5.55mm | 6.20mm | 5.30mm | 5.30mm |
| Product Status | Not For New Designs | Active | Active | Active | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| MSL | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
Primary Recommendation: SLR-343YYT32
The SLR-343YYT32 is the direct parametric equivalent from Rohm Semiconductor. It maintains identical electrical specifications (2.1V forward voltage, 10mA test current, 10mcd brightness) and mechanical form factor (T-1 radial package, 3.10mm lens diameter). The only differences are peak wavelength specification (585nm vs. unspecified for the original) and a marginal height increase (5.60mm vs. 5.40mm). This part carries Active product status, ensuring ongoing availability and supply chain support. ROHS3 compliance and MSL 1 rating are maintained.
Secondary Recommendations for Brightness-Matched Applications: 151031YS05900 and 3YD-F
For applications requiring similar brightness levels (10mcd to 30mcd range), the Würth Elektronik 151031YS05900 and Bivar 3YD-F are suitable alternatives. Both maintain 2.0V to 2.1V forward voltage compatibility and T-1 form factor. The 151031YS05900 offers 30mcd brightness with a 60° viewing angle, while the 3YD-F provides 20mcd with a 35° viewing angle. Both are Active products with full compliance certifications.
Alternative for Lower Brightness Applications: 3YDL-F
The Bivar 3YDL-F is suitable only for applications where reduced brightness (2mcd) and lower test current (2mA) are acceptable. This part maintains T-1 form factor and 2V forward voltage but operates at significantly reduced power levels.
Not Recommended for Direct Substitution: HLMP-1620, HLMP-1620-C00A1, HLMP-1620-C00A2, HLMP-1621
Broadcom HLMP series parts operate at 5V and 12V forward voltages, respectively, and are not electrically compatible with the 2.1V SLR-342YYT32 design. These parts require different circuit design and are suitable only for applications specifically designed for higher voltage operation.
Not Recommended for Direct Substitution: 1254-10UYD/S530-A3 and 264-7UYD/S530-A3
Everlight parts in this comparison operate at 20mA test current and feature significantly higher brightness ratings (200mcd and 125mcd, respectively). While electrically compatible in voltage range, the brightness differential may cause visual inconsistency in indication applications and requires circuit current limiting adjustment.
Frequently Asked Questions (FAQ)
Q: Can I use SLR-343YYT32 as a direct drop-in replacement for SLR-342YYT32?
A: Yes. The SLR-343YYT32 is electrically and mechanically compatible. Both parts share identical forward voltage (2.1V), test current (10mA), brightness (10mcd), viewing angle (40°), and T-1 radial package configuration. The height difference (5.60mm vs. 5.40mm) is within typical PCB clearance tolerances. The SLR-343YYT32 is the recommended upgrade path due to its Active product status.
Q: What is the difference between "Wavelength - Dominant" and "Wavelength - Peak"?
A: Wavelength - Dominant specifies the primary emission wavelength perceived by the human eye. Wavelength - Peak indicates the absolute maximum spectral output, which may differ slightly. For yellow LEDs, both values fall within the 585nm to 591nm range. The visual appearance remains consistent across this spectrum.
Q: Can I substitute a 20mcd brightness LED for a 10mcd application?
A: Substitution is possible but requires circuit evaluation. Higher brightness LEDs (such as 151031YS05900 at 30mcd or 1254-10UYD/S530-A3 at 200mcd) will appear brighter in the same circuit. If brightness consistency is critical, adjust the series current-limiting resistor to reduce LED current to 10mA or lower. Verify that the reduced current does not fall below the minimum specified operating point.
Q: Are all listed substitutes ROHS3 compliant?
A: Yes. All parts in this comparison carry ROHS3 Compliant certification and MSL 1 (Unlimited) moisture sensitivity rating, ensuring environmental and regulatory compatibility with the original SLR-342YYT32.
Q: What is the significance of "Not For New Designs" status?
A: This designation indicates that Rohm Semiconductor has discontinued active development and recommends the SLR-343YYT32 for new applications. However, the SLR-342YYT32 remains available for legacy system support and repair. Existing inventory is sufficient for ongoing maintenance applications.
Q: Can I use HLMP-1620 or HLMP-1621 as substitutes?
A: No. These Broadcom parts operate at 5V and 12V forward voltages, respectively, and are not compatible with circuits designed for 2.1V operation. Using these parts would require complete circuit redesign and are not suitable for direct substitution.
Q: What viewing angle should I consider when selecting a substitute?
A: The original SLR-342YYT32 has a 40° viewing angle. Substitutes with narrower angles (30° to 35°) provide more focused indication, while wider angles (60°) provide broader visibility. Select based on the intended application geometry. For general indication purposes, 35° to 60° viewing angles are interchangeable.
Q: Is packaging format (Cut Tape vs. Bulk) relevant to substitution?
A: Packaging format affects supply chain logistics but not electrical or mechanical compatibility. Both Cut Tape and Bulk packaged parts are functionally identical. Select based on procurement volume and inventory management requirements.
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