P6SMBJ39C Equivalent & Substitute Parts

Part Overview

The P6SMBJ39C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 33.3V reverse standoff voltage with a 56.6V maximum clamping voltage and 11.3A peak pulse current capability in a DO-214AA (SMB) package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

P6SMBJ39C

Littelfuse Inc.In Stock: 1141P6SMBJ39C Datasheet

Current PartRFQ

P6SMB39CA

MeritekIn Stock: 2432P6SMB39CA Datasheet

MFR RecommendedRFQ

SZP6SMB39CAT3G

Littelfuse Inc.In Stock: 2560SZP6SMB39CAT3G Datasheet

MFR RecommendedRFQ

SMBJP6KE39CA-TP

Micro Commercial CoIn Stock: 4620SMBJP6KE39CA-TP Datasheet

DirectRFQ

P6SMB39CA

MeritekIn Stock: 2432P6SMB39CA Datasheet

MFR RecommendedRFQ

SM6T39CA

STMicroelectronicsIn Stock: 75368SM6T39CA Datasheet

MFR RecommendedRFQ

SM6T39CA-E3/52

Vishay General Semiconductor - Diodes DivisionIn Stock: 2177SM6T39CA-E3/52 Datasheet

MFR RecommendedRFQ

SM6T39CAY

STMicroelectronicsIn Stock: 30412SM6T39CAY Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the P6SMBJ39C is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): 33.3V
• Voltage - Clamping (Max) @ Ipp: Must be within acceptable range for circuit protection
• Current - Peak Pulse (10/1000µs): Minimum 11.3A
• Power - Peak Pulse: 600W
• Package / Case: DO-214AA (SMB)
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant

Substitute parts are grouped into two categories based on clamping voltage performance:

Group A (Lower Clamping Voltage: 53.9V): P6SMB39CA, SZP6SMB39CAT3G, SMBJP6KE39CA-TP, SM6T39CA-E3/52. These parts maintain the 33.3V reverse standoff voltage with reduced clamping voltage, suitable for applications requiring tighter voltage regulation.

Group B (Higher Clamping Voltage: 69.7V): SM6T39CA, SM6T39CAY. These parts maintain the 33.3V reverse standoff voltage with elevated clamping voltage and higher peak pulse current (57A), suitable for applications requiring enhanced transient energy absorption.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed are active products with ROHS3 compliance, addressing the obsolescence of the P6SMBJ39C. Selection between substitute groups depends on circuit requirements:

For applications requiring clamping voltage performance closest to the original specification (56.6V), Group A substitutes (P6SMB39CA, SZP6SMB39CAT3G, SMBJP6KE39CA-TP, SM6T39CA-E3/52) provide 53.9V clamping with maintained 11.1–11.3A peak pulse current. These are suitable for general-purpose transient suppression where voltage regulation is the primary design constraint.

For applications requiring enhanced transient energy absorption capability, Group B substitutes (SM6T39CA, SM6T39CAY) provide 69.7V clamping with 57A peak pulse current (8/20µs). These are suitable for high-energy transient environments.

SZP6SMB39CAT3G and SM6T39CAY carry AEC-Q101 automotive qualification, making them appropriate for automotive and mission-critical applications. SMBJP6KE39CA-TP supports the widest operating temperature range (-55°C to 175°C), suitable for extended temperature environments.

Frequently Asked Questions (FAQ)

Q: Can I directly replace P6SMBJ39C with any of the listed substitutes?

A: Direct replacement depends on your circuit's clamping voltage tolerance. Group A substitutes (53.9V clamping) are suitable if your circuit can tolerate lower clamping voltage than the original 56.6V. Group B substitutes (69.7V clamping) are suitable if your circuit can tolerate higher clamping voltage. Verify your circuit design specifications before selection.

Q: What is the difference between Group A and Group B substitutes?

A: Group A substitutes maintain clamping voltage closer to the original specification (53.9V vs. 56.6V) with 11.1–11.3A peak pulse current. Group B substitutes provide higher clamping voltage (69.7V) with significantly higher peak pulse current (57A at 8/20µs), offering greater transient energy absorption capability.

Q: Are all substitutes available in the same package?

A: Yes, all substitute parts use the DO-214AA (SMB) surface-mount package, maintaining mechanical and electrical compatibility with the original P6SMBJ39C footprint.

Q: Which substitute is recommended for automotive applications?

A: SZP6SMB39CAT3G and SM6T39CAY both carry AEC-Q101 automotive qualification. SZP6SMB39CAT3G is recommended for automotive applications requiring Group A clamping voltage performance, while SM6T39CAY is recommended for applications requiring Group B performance.

Q: What is the temperature operating range difference?

A: Most substitutes operate within -55°C to 150°C. SMBJP6KE39CA-TP extends to 175°C, and SZP6SMB39CAT3G and SM6T39CA-E3/52 extend to -65°C minimum, providing wider temperature coverage for specific environmental requirements.

Q: Are all substitutes RoHS compliant?

A: Yes, all substitute parts listed are ROHS3 compliant, meeting environmental and regulatory requirements equivalent to the original P6SMBJ39C.