SLR-342YY3F Yellow Diffused T-1 Through-Hole LED Equivalent & Substitute Parts

Part Overview

The SLR-342YY3F is a yellow diffused T-1 through-hole LED manufactured by Rohm Semiconductor, designed for indication applications. This part carries a "Not For New Designs" status, making it necessary to identify equivalent and substitute components for ongoing production and new design implementations. The part delivers 10mcd brightness at 2.1V forward voltage with a 40° viewing angle and 587nm dominant wavelength in a standard radial package.

Key Parameters

Parameter	Value
Manufacturer Part Number	SLR-342YY3F
Manufacturer	Rohm Semiconductor
Color	Yellow
Lens Transparency	Diffused
Millicandela Rating	10mcd
Voltage - Forward (Vf) Typical	2.1V
Current - Test	10mA
Viewing Angle	40°
Mounting Type	Through Hole
Wavelength - Dominant	587nm
Lens Size	3.10mm Dia
Height (Max)	5.40mm
Package / Case	Radial
RoHS Status	ROHS3 Compliant
Product Status	Not For New Designs

Substitute Part Grouping Explanation

Substitution eligibility for the SLR-342YY3F is determined by the following critical parameters:

Primary Substitution Criteria:

Color: Yellow
Lens Transparency: Diffused
Mounting Type: Through Hole
Wavelength Range: 585nm–591nm (yellow spectrum)
Forward Voltage: 2.0V–2.1V
Package Type: Radial (T-1 or equivalent 3mm form factor)

Secondary Compatibility Factors:

Millicandela Rating: 10mcd–200mcd (brightness variations acceptable for indication applications)
Current Rating: 10mA–20mA test current
Viewing Angle: 30°–60° (application-dependent)
Height: 5.20mm–6.40mm (PCB clearance considerations)

Substitutes are grouped into two categories: Parametric Equivalents (matching all primary criteria with identical specifications) and Similar Parts (meeting primary criteria with acceptable variations in secondary parameters).

Parameter Comparison

Part Number	Manufacturer	Color	Lens Transparency	Millicandela	Vf (Typ)	Current - Test	Viewing Angle	Wavelength - Dominant	Lens Size	Height (Max)	Product Status
SLR-342YY3F	Rohm Semiconductor	Yellow	Diffused	10mcd	2.1V	10mA	40°	587nm	3.10mm	5.40mm	Not For New Designs
SLR-343YY3F	Rohm Semiconductor	Yellow	Diffused	10mcd	2.1V	10mA	40°	587nm	3.10mm	5.60mm	Active
1254-10UYD/S530-A3	Everlight Electronics Co Ltd	Yellow	Diffused	200mcd	2V	20mA	30°	589nm	3.00mm	5.20mm	Active
151031YS05900	Würth Elektronik	Yellow	Diffused	30mcd	2.1V	20mA	60°	590nm	3.00mm	5.55mm	Active
264-7UYD/S530-A3	Everlight Electronics Co Ltd	Yellow	Diffused	125mcd	2V	20mA	60°	589nm	2.90mm	6.20mm	Active
3YD-F	Bivar Inc.	Yellow	Diffused	20mcd	2V	20mA	35°	—	3mm, T-1	5.30mm	Active
3YDL-F	Bivar Inc.	Yellow	Diffused	2mcd	2V	2mA	35°	—	3mm, T-1	5.30mm	Active
4303F7	Visual Communications Company - VCC	Yellow	Diffused	10mcd	2.1V	10mA	55°	—	3mm, T-1	6.40mm	Active
HLMP-1620	Broadcom Limited	Yellow	Diffused	2.2mcd	5V	10mA	60°	585nm	3mm, T-1	6.35mm	Active
HLMP-1620-C00A1	Broadcom Limited	Yellow	Diffused, Tinted	2.2mcd	5V	10mA	60°	—	3mm, T-1	—	Active

Engineering Selection Recommendations

Recommended Primary Substitute: SLR-343YY3F

The SLR-343YY3F from Rohm Semiconductor is the direct parametric equivalent to the SLR-342YY3F. It matches all electrical and optical specifications (10mcd, 2.1V, 587nm, 40° viewing angle) while maintaining identical through-hole radial packaging. The SLR-343YY3F carries Active product status, making it suitable for new designs and ongoing production. Height difference of 0.20mm (5.60mm vs 5.40mm) presents no functional impact for standard PCB applications.

Alternative Substitutes by Application Requirements:

For applications requiring higher brightness output, the 151031YS05900 (Würth Elektronik, 30mcd) and 1254-10UYD/S530-A3 (Everlight, 200mcd) provide increased luminous intensity while maintaining 2.0V–2.1V forward voltage and diffused yellow lens characteristics. Both are Active status components with ROHS3 compliance.

For applications with tighter PCB height constraints, the 1254-10UYD/S530-A3 (5.20mm height) and 3YD-F (5.30mm height) offer compact form factors.

For applications requiring lower brightness, the 3YDL-F (2mcd) and HLMP-1620 series (2.2mcd) provide reduced luminous intensity options. Note that HLMP-1620 series operates at 5V forward voltage, requiring circuit redesign for compatibility.

All recommended substitutes carry ROHS3 compliance and MSL-1 moisture sensitivity rating, matching the original part's environmental specifications.

Frequently Asked Questions (FAQ)

Q: Can SLR-343YY3F directly replace SLR-342YY3F without circuit modification?

A: Yes. The SLR-343YY3F is a parametric equivalent with identical electrical specifications (2.1V forward voltage, 10mA test current, 10mcd brightness) and optical characteristics (587nm wavelength, 40° viewing angle, diffused yellow lens). The 0.20mm height difference does not affect standard PCB applications. No circuit redesign is required.

Q: What is the key difference between the SLR-342YY3F and SLR-343YY3F?

A: The primary difference is product status. SLR-342YY3F is marked "Not For New Designs," while SLR-343YY3F is Active. Both parts are electrically and optically identical. The SLR-343YY3F is the recommended upgrade path for existing designs using the SLR-342YY3F.

Q: Can I use HLMP-1620 as a substitute?

A: HLMP-1620 is not recommended as a direct substitute. While it shares the yellow diffused lens and T-1 form factor, it operates at 5V forward voltage compared to the SLR-342YY3F's 2.1V. Circuit redesign is required to accommodate the higher voltage rating. Additionally, HLMP-1620 provides only 2.2mcd brightness versus 10mcd, resulting in significantly reduced luminous intensity.

Q: Are there brightness variations among the substitute parts?

A: Yes. Substitute parts range from 2mcd (3YDL-F) to 200mcd (1254-10UYD/S530-A3), compared to the original 10mcd. Selection depends on application requirements. For indication applications requiring similar brightness, SLR-343YY3F (10mcd), 3YD-F (20mcd), and 4303F7 (10mcd) are appropriate. For higher-visibility applications, 151031YS05900 (30mcd) and 264-7UYD/S530-A3 (125mcd) are suitable.

Q: Do all substitutes maintain the same viewing angle?

A: No. The original SLR-342YY3F has a 40° viewing angle. Substitutes range from 30° (1254-10UYD/S530-A3) to 60° (151031YS05900, 264-7UYD/S530-A3, HLMP-1620 series). Wider viewing angles (60°) provide better visibility from off-axis positions, while narrower angles (30°) concentrate light output. Select based on application geometry and visibility requirements.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the original SLR-342YY3F environmental specification.

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

A: The SLR-342YY3F features a diffused lens, which scatters light output for uniform brightness across the viewing angle. Clear lens alternatives (such as SLR-343YCT32) concentrate light output for higher peak brightness in the forward direction. For direct substitution, maintain diffused lens transparency unless application requirements specifically call for clear optics.

Q: Can I use 3YDL-F for the same application?

A: 3YDL-F is not recommended for direct substitution. While it maintains the diffused yellow lens and T-1 form factor, it operates at 2mA test current and provides only 2mcd brightness compared to the original 10mcd and 10mA specification. This part is designed for low-brightness indication applications and will not provide equivalent luminous output.

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