SLR343BC7T3F Equivalent & Substitute Parts

Part Overview

The SLR343BC7T3F is a blue LED indicator from Rohm Semiconductor, designed for through-hole applications with a T-1 radial package. This component features a 470nm dominant wavelength, 3.2V forward voltage, and 470mcd luminous intensity. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	SLR343BC7T3F
Manufacturer	Rohm Semiconductor
Description	LED BLUE CLEAR T-1 T/H
Color	Blue
Lens Style	Round with Domed Top
Lens Size	3.10mm Dia
Voltage - Forward (Vf) (Typ)	3.2V
Current - Test	20mA
Millicandela Rating	470mcd
Wavelength - Dominant	470nm
Viewing Angle	40°
Mounting Type	Through Hole
Package / Case	Radial
Supplier Device Package	T-1
Height (Max)	5.60mm
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the SLR343BC7T3F is determined by the following critical parameters:

Package Type: T-1 radial through-hole mounting
Color: Blue LED indication
Lens Configuration: Clear, round domed top
Electrical Compatibility: Forward voltage and test current ratings
Optical Performance: Wavelength range and luminous intensity
Compliance: RoHS3 compliance and regulatory certifications

The substitute parts listed maintain compatibility across these core parameters while accounting for variations in forward voltage, luminous intensity, and viewing angle that may require circuit design adjustments.

Parameter Comparison

Parameter	SLR343BC7T3F (Main)	SLR343BN4TT32	SSL-LX3044SBC/A	SSL-LX3054SBC
Manufacturer	Rohm Semiconductor	Rohm Semiconductor	Lumex Opto/Components Inc.	Lumex Opto/Components Inc.
Color	Blue	Blue	Blue	Blue
Lens Style	Round with Domed Top	-	Round with Domed Top	Round with Domed Top
Lens Size	3.10mm Dia	-	3mm, T-1	3mm, T-1
Voltage - Forward (Vf) (Typ)	3.2V	-	4.5V	4.5V
Current - Test	20mA	20mA	20mA	20mA
Millicandela Rating	470mcd	-	50mcd	100mcd
Wavelength - Dominant	470nm	-	-	-
Wavelength - Peak	-	-	430nm	430nm
Viewing Angle	40°	-	30°	30°
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial	Radial	Radial	Radial
Supplier Device Package	T-1	T-1	T-1	T-1
Height (Max)	5.60mm	-	4.60mm	5.25mm
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

SLR343BN4TT32 (Rohm Semiconductor): This part maintains the same manufacturer lineage as the main component and is currently in active production status. It is ROHS3 compliant and shares the T-1 radial package configuration. This option provides the closest manufacturer continuity for designs originally specified with Rohm components.

SSL-LX3044SBC/A (Lumex Opto/Components Inc.): This substitute operates at 4.5V forward voltage with reduced luminous intensity (50mcd) compared to the main part. The lower height (4.60mm) and narrower viewing angle (30°) may require circuit design modifications. ROHS3 compliance and unlimited moisture sensitivity rating are maintained.

SSL-LX3054SBC (Lumex Opto/Components Inc.): This substitute provides intermediate luminous intensity (100mcd) at 4.5V forward voltage. The height (5.25mm) and viewing angle (30°) differ from the main part. ROHS3 compliance and unlimited moisture sensitivity rating are maintained. This option offers better optical performance than the SSL-LX3044SBC/A while maintaining Lumex sourcing.

All substitute parts maintain ROHS3 compliance and regulatory certifications (REACH Unaffected, ECCN EAR99, HTSUS 8541.41.0000) consistent with the main part.

Frequently Asked Questions (FAQ)

Q: Can SLR343BN4TT32 be used as a direct replacement for SLR343BC7T3F?

A: SLR343BN4TT32 shares the same manufacturer (Rohm Semiconductor), T-1 radial package, and blue LED configuration. However, specific electrical and optical parameters are not provided for SLR343BN4TT32 in the available data. Verification against your circuit design requirements is necessary before implementation.

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

A: The Rohm substitute (SLR343BN4TT32) maintains manufacturer continuity. Lumex substitutes (SSL-LX3044SBC/A and SSL-LX3054SBC) operate at higher forward voltage (4.5V vs. 3.2V), which requires circuit design adjustments. Lumex parts also feature narrower viewing angles (30° vs. 40°) and different luminous intensity ratings.

Q: How does forward voltage affect circuit design?

A: The main part operates at 3.2V forward voltage, while Lumex substitutes operate at 4.5V. This 1.3V difference affects series resistor calculations and power supply requirements. Designs must be recalculated to maintain proper LED current (20mA test current) and prevent component damage.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and maintain REACH Unaffected status, consistent with the main part's regulatory compliance.

Q: What is the significance of Moisture Sensitivity Level (MSL) differences?

A: The main part and Lumex substitutes have MSL 1 (Unlimited), allowing indefinite storage without moisture control. SLR343BN4TT32 has MSL 3 (168 Hours), requiring moisture control during storage and handling. This affects supply chain management and component shelf life protocols.

Q: Do package dimensions affect PCB layout?

A: Yes. Height variations (4.60mm to 5.60mm) and lens size differences (3mm vs. 3.10mm) may affect PCB clearance and mechanical fit. Viewing angle differences (30° vs. 40°) impact optical performance in the application. PCB layout and mechanical design must be verified for each substitute.

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