SLR343BCT3F Equivalent & Substitute Parts

Part Overview

The SLR343BCT3F is a blue LED indicator from Rohm Semiconductor, designed for through-hole applications with a 470nm dominant wavelength and 3.3V forward voltage. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The SLR343 series provides standard blue indication functionality in a T-1 radial package with a clear, domed lens.

Substiute Parts

SLR343BCT3F

Rohm SemiconductorIn Stock: 667SLR343BCT3F Datasheet

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SLR343BN4T3F

Rohm SemiconductorIn Stock: 871SLR343BN4T3F Datasheet

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SSL-LX3044SBC/A

Lumex Opto/Components Inc.In Stock: 1209SSL-LX3044SBC/A Datasheet

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SSL-LX3054SBC

Lumex Opto/Components Inc.In Stock: 737SSL-LX3054SBC Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the SLR343BCT3F is determined by the following critical parameters:

• Color: Blue
• Mounting Type: Through Hole (Radial)
• Package: T-1
• Lens Style: Round with Domed Top
• Wavelength Range: 430nm–470nm (blue spectrum)
• Forward Voltage: 3.2V–4.5V
• Millicandela Rating: 50mcd–680mcd
• Viewing Angle: 30°–40°
• Compliance: ROHS3 Compliant, REACH Unaffected

The substitute parts listed maintain compatibility with through-hole PCB designs and preserve the blue LED indication function. Variations in forward voltage, brightness, and viewing angle reflect different application requirements within the blue LED indicator category.

Parameter Comparison

Engineering Selection Recommendations

SLR343BN4T3F (Rohm Semiconductor) is the primary equivalent substitute. It maintains the same manufacturer lineage, identical mechanical dimensions (5.60mm height, 3.10mm lens diameter), matching viewing angle (40°), and equivalent forward voltage (3.2V vs. 3.3V). This part is active in production status, ensuring long-term availability. The slightly higher brightness rating (680mcd vs. 600mcd) provides improved visibility margin.

SSL-LX3044SBC/A and SSL-LX3054SBC (Lumex Opto/Components Inc.) are alternative substitutes for applications where higher forward voltage (4.5V) is acceptable. These parts maintain T-1 radial through-hole compatibility and ROHS3 compliance. The SSL-LX3054SBC offers intermediate brightness (100mcd) with a height of 5.25mm, closely matching the original part profile. The SSL-LX3044SBC provides lower brightness (50mcd) with a reduced height of 4.60mm, suitable for space-constrained designs.

All substitute parts are ROHS3 compliant and REACH unaffected, meeting regulatory requirements equivalent to the original part.

Frequently Asked Questions (FAQ)

Q: Can SLR343BN4T3F directly replace SLR343BCT3F without circuit modification?

A: Yes. The SLR343BN4T3F operates at 3.2V forward voltage compared to 3.3V, a 0.1V difference within typical LED tolerance. Both parts are rated for 20mA test current and maintain identical mechanical dimensions and viewing angle. No circuit redesign is required.

Q: What are the key differences between Rohm and Lumex substitutes?

A: Rohm SLR343BN4T3F maintains the closest electrical and mechanical match (3.2V, 680mcd, 40° viewing angle). Lumex parts (SSL-LX3044SBC/A and SSL-LX3054SBC) operate at higher forward voltage (4.5V) and narrower viewing angle (30°), requiring circuit voltage adjustment and potentially affecting visibility in wide-angle applications.

Q: Are all substitute parts available in the same packaging?

A: All substitute parts use T-1 radial through-hole packaging with round domed lenses. Mechanical dimensions vary slightly: SLR343BN4T3F and SLR343BCT3F are 5.60mm height; SSL-LX3054SBC is 5.25mm; SSL-LX3044SBC/A is 4.60mm. Verify PCB clearance for height-sensitive layouts.

Q: Do substitute parts meet the same compliance standards?

A: Yes. All listed substitutes are ROHS3 compliant and REACH unaffected, matching the regulatory status of the original SLR343BCT3F.

Q: Which substitute is recommended for new designs?

A: SLR343BN4T3F is recommended for direct replacement in existing designs. For new designs, either Rohm or Lumex parts are acceptable based on circuit voltage availability and viewing angle requirements.