SLR343BC4TT32 Equivalent & Substitute Parts

Part Overview

The SLR343BC4TT32 is a blue LED indication component manufactured by Rohm Semiconductor, designed for through-hole mounting applications. This part operates at 3.2V forward voltage with a 470nm dominant wavelength and delivers 470mcd luminous intensity. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Substiute Parts

SLR343BC4TT32

Rohm SemiconductorIn Stock: 699SLR343BC4TT32 Datasheet

Current PartRFQ

QLR343BN4TT32

Rohm SemiconductorIn Stock: 743QLR343BN4TT32 Datasheet

MFR RecommendedRFQ

SSL-LX3044SBC/A

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

SimilarRFQ

SSL-LX3054SBC

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SLR343BC4TT32 are evaluated based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

• Mounting Type: Through Hole (radial configuration)
• Supplier Device Package: T-1 form factor
• Color: Blue wavelength range
• Lens Style: Round with Domed Top
• Lens Transparency: Clear
• Configuration: Standard
• Compliance: ROHS3 Compliant, REACH Unaffected

Secondary Electrical Parameters:

• Voltage - Forward (Vf): Operating voltage range
• Current - Test: 20mA standard test current
• Millicandela Rating: Luminous intensity
• Viewing Angle: Beam width characteristics

The MFR Recommended substitute QLR343BN4TT32 shares the same base product lineage and manufacturer, providing direct compatibility. The Lumex alternatives (SSL-LX3044SBC/A and SSL-LX3054SBC) provide functional substitution within the T-1 through-hole blue LED category, though with different electrical characteristics that require circuit evaluation.

Parameter Comparison

Engineering Selection Recommendations

QLR343BN4TT32 (MFR Recommended Substitute): This part is the primary recommendation for direct replacement. Manufactured by Rohm Semiconductor, it maintains product lineage continuity and shares the same base product number (SLR343 vs QLR343). Active product status ensures long-term availability and supply chain stability. ROHS3 compliance and REACH unaffected status match the original part's regulatory standing.

SSL-LX3044SBC/A and SSL-LX3054SBC (Similar Alternatives): These Lumex parts provide functional substitution for applications where the original part is unavailable. Both maintain T-1 through-hole radial configuration and blue LED color specification. Active product status and full compliance certifications (ROHS3, REACH unaffected) support production use. Circuit design modifications are required due to higher forward voltage (4.5V vs 3.2V) and different luminous intensity ratings. SSL-LX3054SBC offers higher brightness (100mcd) compared to SSL-LX3044SBC/A (50mcd), providing options for different visibility requirements.

Frequently Asked Questions (FAQ)

Q: Can QLR343BN4TT32 be used as a direct drop-in replacement for SLR343BC4TT32?

A: QLR343BN4TT32 is the manufacturer-recommended substitute and shares the same base product lineage from Rohm Semiconductor. Verify electrical specifications in the respective datasheets before implementation, as some parameters are not specified in the available data.

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

A: The primary difference is forward voltage: Rohm QLR343BN4TT32 maintains compatibility with the original 3.2V specification, while Lumex alternatives (SSL-LX3044SBC/A and SSL-LX3054SBC) operate at 4.5V. This requires circuit redesign for current-limiting resistor values. Luminous intensity also differs: Lumex parts range from 50mcd to 100mcd versus the original 470mcd.

Q: Are all substitute parts available in the same T-1 package?

A: Yes. All substitute parts use T-1 through-hole radial packaging with round domed-top lens configuration, ensuring mechanical compatibility with existing PCB layouts and mounting hardware.

Q: Do the substitute parts meet the same compliance requirements?

A: Yes. All substitute parts are ROHS3 compliant and REACH unaffected, matching the regulatory status of the original SLR343BC4TT32.

Q: Which substitute should be selected for new designs?

A: QLR343BN4TT32 is recommended for new designs due to active product status and manufacturer continuity. Lumex alternatives are suitable when specific brightness or voltage characteristics align with application requirements.