SLR343BC4T3F Equivalent & Substitute Parts

Part Overview

The SLR343BC4T3F is a blue LED indicator from Rohm Semiconductor, designed for through-hole applications with a 470nm dominant wavelength and 3.2V 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 suitable for PCB mounting.

Substiute Parts

SLR343BC4T3F

Rohm SemiconductorIn Stock: 1057SLR343BC4T3F Datasheet

Current PartRFQ

SLR343BN4T3F

Rohm SemiconductorIn Stock: 871SLR343BN4T3F Datasheet

SimilarRFQ

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

Substitution for the SLR343BC4T3F is determined by the following critical parameters: color (blue), mounting type (through hole), package type (T-1 radial), lens style (round domed), and electrical characteristics (forward voltage, test current, and wavelength range).

The substitute parts are grouped into two categories:

Direct Series Equivalent: SLR343BN4T3F maintains the same manufacturer (Rohm Semiconductor), series designation (SLR343x), package format (T-1 radial), and electrical specifications (3.2V forward voltage, 20mA test current, 470nm dominant wavelength). This part differs only in lens transparency specification and millicandela rating (680mcd vs. 470mcd), representing an enhanced brightness variant within the same product line.

Cross-Manufacturer Alternatives: SSL-LX3044SBC/A and SSL-LX3054SBC from Lumex Opto/Components Inc. provide functional equivalence as blue T-1 through-hole LEDs with identical mounting and package characteristics. These parts operate at 4.5V forward voltage with peak wavelengths at 430nm, representing a different electrical and spectral profile suitable for applications where voltage tolerance and brightness requirements differ from the original specification.

Parameter Comparison

Engineering Selection Recommendations

SLR343BN4T3F is the preferred direct substitute for the SLR343BC4T3F. Both parts are manufactured by Rohm Semiconductor, share identical forward voltage (3.2V), test current (20mA), dominant wavelength (470nm), viewing angle (40°), and physical dimensions. The SLR343BN4T3F is currently active in production, ensuring long-term availability and supply chain continuity. Both parts maintain ROHS3 compliance and identical REACH status. The primary difference is increased brightness (680mcd vs. 470mcd), which represents an enhancement rather than a limitation for most indication applications.

SSL-LX3044SBC/A and SSL-LX3054SBC are cross-manufacturer alternatives suitable only for applications where forward voltage tolerance permits 4.5V operation. These Lumex parts operate at a higher forward voltage than the original specification and feature lower brightness ratings (50mcd and 100mcd respectively). Selection of these alternatives requires circuit redesign to accommodate the increased voltage drop. Both Lumex parts are active products with ROHS3 compliance and REACH unaffected status. The SSL-LX3054SBC provides closer brightness matching (100mcd) compared to the SSL-LX3044SBC (50mcd) if voltage substitution is necessary.

Frequently Asked Questions (FAQ)

Q: Can SLR343BN4T3F be used as a direct replacement for SLR343BC4T3F?

A: Yes. Both parts share identical electrical specifications (3.2V forward voltage, 20mA test current, 470nm dominant wavelength), mechanical package (T-1 radial through-hole), and physical dimensions. The SLR343BN4T3F provides higher brightness (680mcd vs. 470mcd) and is currently in active production status.

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

A: The Rohm SLR343BN4T3F maintains the original 3.2V forward voltage specification. The Lumex alternatives (SSL-LX3044SBC/A and SSL-LX3054SBC) operate at 4.5V, requiring circuit modification. Lumex parts also feature lower brightness ratings and narrower viewing angles (30° vs. 40°).

Q: Can Lumex SSL-LX3044SBC/A or SSL-LX3054SBC be used without circuit changes?

A: No. These parts require 4.5V forward voltage compared to the original 3.2V specification. Direct substitution without circuit redesign will result in incorrect LED operation. Current-limiting resistor values must be recalculated based on the new forward voltage.

Q: Are all substitute parts RoHS compliant?

A: Yes. SLR343BN4T3F, SSL-LX3044SBC/A, and SSL-LX3054SBC are all ROHS3 compliant and REACH unaffected, matching the compliance status of the original SLR343BC4T3F.

Q: What is the impact of brightness differences between substitute parts?

A: The SLR343BN4T3F provides higher brightness (680mcd) than the original (470mcd), suitable for all applications requiring equal or greater visibility. The Lumex alternatives provide significantly lower brightness (50mcd and 100mcd), suitable only for applications with reduced brightness requirements or where the original brightness was excessive.

Q: Are physical dimensions compatible across all substitute options?

A: All parts use T-1 radial through-hole packages with round domed lens styles and 3mm to 3.10mm lens diameters. Maximum heights range from 4.60mm to 5.60mm. Verify PCB clearance for the specific substitute selected, particularly for the SSL-LX3044SBC/A (4.60mm height) if space is constrained.