RSB6.8CST2R Equivalent & Substitute Parts

Part Overview

The RSB6.8CST2R is a transient voltage suppressor (TVS) diode manufactured by Rohm Semiconductor, designed for general-purpose overvoltage protection applications. This component features a 4.6V reverse standoff voltage with a 10W peak pulse power rating in a compact VMN2 (SOD-923) surface mount package. The part is classified as "Not For New Designs," indicating it has been superseded in Rohm's product portfolio. Finding equivalent or substitute parts is necessary for applications requiring continued supply, design updates, or alternative sourcing strategies.

Substiute Parts

RSB6.8CST2R

Rohm SemiconductorIn Stock: 29368RSB6.8CST2R Datasheet

Current PartRFQ

PESD5V0V1BL,315

Nexperia USA Inc.In Stock: 66785PESD5V0V1BL,315 Datasheet

SimilarRFQ

VCUT03B1-DD1-G-08

Vishay General Semiconductor - Diodes DivisionIn Stock: 4512VCUT03B1-DD1-G-08 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RSB6.8CST2R are identified based on the following critical parameters that determine functional compatibility:

• Voltage Classification: Reverse standoff voltage (Vwm) and breakdown voltage (Vbr) must fall within acceptable operating ranges for the protected circuit
• Zener Type: Single-channel, unidirectional or bidirectional configuration
• Power Dissipation: Peak pulse power rating must meet or exceed application requirements
• Temperature Range: Operating temperature limits must encompass the intended application environment
• Surface Mount Packaging: All substitutes must be surface mount compatible for PCB integration
• Regulatory Compliance: RoHS3 compliance and REACH status alignment

Two substitute parts meet these criteria: PESD5V0V1BL,315 (Nexperia) and VCUT03B1-DD1-G-08 (Vishay). Both are active TVS diodes with comparable voltage ratings, surface mount packages, and full regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

VCUT03B1-DD1-G-08 (Vishay) is the primary substitute for the RSB6.8CST2R. This part maintains the identical 4.6V reverse standoff voltage specification, ensuring direct functional compatibility. The 40W peak pulse power rating exceeds the original 10W specification, providing enhanced protection margin. The part is in active production status with full ROHS3 compliance and REACH unaffected designation. The operating temperature range of -40°C ~ 125°C covers most industrial and commercial applications, though it does not extend to the full -55°C lower limit of the original part.

PESD5V0V1BL,315 (Nexperia) serves as an alternative substitute with a higher 5V reverse standoff voltage. This part is suitable for applications where slightly elevated voltage thresholds are acceptable. The 45W peak pulse power rating provides the highest protection capability among the three options. This part includes AEC-Q100 automotive qualification and maintains the full -55°C ~ 150°C temperature range of the original part. The higher clamping voltage (12.5V) may require circuit-level evaluation for compatibility.

Both substitutes are surface mount components in SOD-882 packages, which differ from the original VMN2 package. PCB layout modifications may be necessary to accommodate the different footprint.

Frequently Asked Questions (FAQ)

Q: Can PESD5V0V1BL,315 directly replace RSB6.8CST2R in all applications?

A: PESD5V0V1BL,315 has a higher reverse standoff voltage (5V vs. 4.6V) and clamping voltage (12.5V vs. unspecified). It is suitable for applications where the protected circuit can tolerate these higher voltage thresholds. The 45W power rating exceeds the original 10W specification.

Q: Can VCUT03B1-DD1-G-08 directly replace RSB6.8CST2R in all applications?

A: VCUT03B1-DD1-G-08 maintains the 4.6V reverse standoff voltage, making it functionally equivalent for voltage protection thresholds. The 40W power rating exceeds the original specification. The operating temperature range (-40°C ~ 125°C) is narrower than the original (-55°C ~ 150°C), which may be a limitation in extreme temperature environments.

Q: What are the package differences between these parts?

A: The RSB6.8CST2R uses a VMN2 (SOD-923) package with 2-SMD flat leads. Both substitutes use SOD-882 packages (DFN1006-2 for Nexperia, LLP1006-2M for Vishay). These are different footprints requiring PCB redesign for physical compatibility.

Q: Are both substitutes RoHS3 compliant?

A: Yes. Both PESD5V0V1BL,315 and VCUT03B1-DD1-G-08 are ROHS3 compliant and REACH unaffected, matching the regulatory status of the original part.

Q: Which substitute has the best temperature range coverage?

A: PESD5V0V1BL,315 maintains the full -55°C ~ 150°C operating range of the original part. VCUT03B1-DD1-G-08 operates from -40°C ~ 125°C, which is narrower but sufficient for most commercial and industrial applications.

Q: What is the difference in peak pulse current capability?

A: PESD5V0V1BL,315 provides 4.8A (8/20µs) peak pulse current, while VCUT03B1-DD1-G-08 provides 4.6A (8/20µs). Both exceed typical requirements for general-purpose TVS applications, though the Nexperia part offers higher current handling capacity.