P6SMB68CAT3 Equivalent & Substitute Parts

Part Overview

The P6SMB68CAT3 is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for surface mount applications in the DO-214AA (SMB) package. This component features a 58.1V reverse standoff voltage with 92V maximum clamping voltage and 6.5A peak pulse current capability. The part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements.

Substiute Parts

P6SMB68CAT3

onsemiIn Stock: 2295P6SMB68CAT3 Datasheet

Current PartRFQ

P6SMB68CA

Eaton - Electronics DivisionIn Stock: 1480P6SMB68CA Datasheet

DirectRFQ

P6SMB68CA

Eaton - Electronics DivisionIn Stock: 1480P6SMB68CA Datasheet

DirectRFQ

1KSMB68CA

Taiwan Semiconductor CorporationIn Stock: 304611KSMB68CA Datasheet

SimilarRFQ

SM6T68CA

STMicroelectronicsIn Stock: 31895SM6T68CA Datasheet

SimilarRFQ

SM6T68CAY

STMicroelectronicsIn Stock: 162885SM6T68CAY Datasheet

SimilarRFQ

SMBJ58CA

Good-Ark SemiconductorIn Stock: 22027SMBJ58CA Datasheet

SimilarRFQ

SMBJP6KE68CA-TP

Micro Commercial CoIn Stock: 4139SMBJP6KE68CA-TP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P6SMB68CAT3 is determined by the following critical electrical and mechanical parameters:

Primary Matching Criteria:

• Voltage - Reverse Standoff (Typ): 58.1V
• Voltage - Clamping (Max) @ Ipp: 92V (±tolerance acceptable)
• Package / Case: DO-214AA, SMB (surface mount compatibility)
• Type: Zener (bidirectional TVS diode)
• Bidirectional Channels: 1

Secondary Compatibility Factors:

• Current - Peak Pulse (10/1000µs): 6.5A minimum
• Power - Peak Pulse: 600W minimum
• Operating Temperature range compatibility
• Mounting Type: Surface Mount

Substitute parts are grouped into two categories:

Direct Equivalents: Parts with matching voltage specifications (58.1V standoff, 92V clamping) and identical package format, suitable for direct replacement without circuit modification.

Similar Alternatives: Parts with the same voltage class (58.1V standoff) and compatible package, with variations in clamping voltage, peak current, or power rating that remain functionally acceptable within the application's transient suppression requirements.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred):

The 1KSMB68CA (Taiwan Semiconductor Corporation) and SMBJP6KE68CA-TP (Micro Commercial Co) provide the closest electrical equivalence to the P6SMB68CAT3. Both maintain the 58.1V reverse standoff voltage and 92V clamping voltage specifications. The 1KSMB68CA offers enhanced performance with 1000W peak pulse power and extended temperature range (-55°C to 175°C), while the SMBJP6KE68CA-TP maintains the 600W rating with similar temperature capability. Both are active products with RoHS3 compliance.

For Automotive Applications:

The SM6T68CAY (STMicroelectronics) is the only substitute part carrying automotive grade designation with AEC-Q101 qualification, matching the original part's automotive credentials. This part maintains the 58.1V standoff voltage with a higher 121V clamping voltage and 33A peak pulse current, providing enhanced transient suppression capability. Operating temperature extends to 175°C.

For General Purpose Applications:

The SM6T68CA (STMicroelectronics) offers similar electrical characteristics to SM6T68CAY without automotive grading, suitable for non-automotive transient suppression circuits. The SMBJ58CA (Good-Ark Semiconductor) provides a cost-effective alternative with 58V standoff voltage and 93.6V clamping voltage, maintaining 600W power rating and active product status.

Compliance Consideration:

All substitute parts listed are RoHS3 compliant, addressing the non-compliance status of the obsolete P6SMB68CAT3. Selection should prioritize parts matching the original application's environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can P6SMB68CA (Eaton) be used as a substitute for P6SMB68CAT3?

A: No. The Eaton P6SMB68CA has a 5.8V reverse standoff voltage and 10.5V clamping voltage, which are one order of magnitude lower than the original part's 58.1V and 92V specifications. This part is not suitable for the same application.

Q: What is the difference between 1KSMB68CA and SMBJP6KE68CA-TP?

A: Both parts maintain the critical 58.1V standoff and 92V clamping voltages. The 1KSMB68CA offers 1000W peak pulse power versus 600W for the SMBJP6KE68CA-TP, and extends to 175°C maximum junction temperature. The SMBJP6KE68CA-TP is limited to 175°C as well. Selection depends on thermal and power dissipation requirements of the specific application.

Q: Why does SM6T68CAY have a higher clamping voltage (121V) than the original part (92V)?

A: The SM6T68CAY maintains the same 58.1V reverse standoff voltage but exhibits a higher clamping voltage due to different internal diode characteristics. This provides more aggressive transient suppression. The part is suitable for applications where additional clamping margin is acceptable or beneficial.

Q: Are all substitute parts available in the same SMB package?

A: Yes. All substitute parts listed use the DO-214AA (SMB) surface mount package, ensuring mechanical and footprint compatibility with the original P6SMB68CAT3 design.

Q: Which substitute part is recommended for new automotive designs?

A: The SM6T68CAY is the recommended choice for automotive applications, as it carries AEC-Q101 qualification and automotive grade designation, matching the original part's automotive credentials while providing active product status and RoHS3 compliance.

Q: What is the impact of the lower operating temperature minimum (-55°C vs -65°C) in substitute parts?

A: Most substitute parts specify -55°C minimum junction temperature versus the original part's -65°C. For applications requiring operation below -55°C, circuit design review is necessary to confirm thermal margins remain adequate.