P6SMB20C Equivalent & Substitute Parts

Part Overview

The P6SMB20C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This bidirectional Zener diode operates with a reverse standoff voltage of 17.1V and provides clamping at 29.09V maximum. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

P6SMB20C

Littelfuse Inc.In Stock: 716P6SMB20C Datasheet

Current PartRFQ

P6SMB20CA

Eaton - Electronics DivisionIn Stock: 35475P6SMB20CA Datasheet

MFR RecommendedRFQ

P6SMB20CA

Eaton - Electronics DivisionIn Stock: 35475P6SMB20CA Datasheet

MFR RecommendedRFQ

SMBJP6KE20CA-TP

Micro Commercial CoIn Stock: 1454SMBJP6KE20CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the P6SMB20C is determined by the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 17.1V
• Voltage - Breakdown (Min): 18V or higher
• Voltage - Clamping (Max) @ Ipp: Must not exceed 29.09V
• Current - Peak Pulse (10/1000µs): 22A or higher
• Power - Peak Pulse: 600W
• Package / Case: DO-214AA, SMB (Surface Mount)
• Operating Temperature Range: -55°C minimum to 150°C minimum
• Type: Zener, Bidirectional

The substitute parts identified meet these electrical specifications within acceptable tolerances and maintain the same physical package form factor, ensuring direct replacement capability in existing circuit designs.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts are active products with ROHS3 compliance, addressing the obsolescence of the P6SMB20C.

P6SMB20CA (Eaton - Electronics Division): This part maintains identical reverse standoff voltage and operating temperature range. The clamping voltage of 27.7V is lower than the original 29.09V, providing improved transient suppression. Peak pulse current is 21.7A, marginally below the original 22A specification. This part is suitable for applications where lower clamping voltage is acceptable or beneficial.

SMBJP6KE20CA-TP (Micro Commercial Co): This part matches the original peak pulse current of 22A and provides the same 27.7V clamping voltage. The extended operating temperature range to 175°C offers additional thermal margin. This part is suitable for applications requiring the original current rating and extended temperature performance.

Both parts are available in active production status with established supply chains, ensuring long-term availability compared to the obsolete P6SMB20C.

Frequently Asked Questions (FAQ)

Q: Can P6SMB20CA be used as a direct replacement for P6SMB20C?

A: Yes. Both parts share the same reverse standoff voltage (17.1V), package form factor (DO-214AA, SMB), and power rating (600W). The P6SMB20CA provides lower clamping voltage (27.7V vs 29.09V), which represents improved performance in transient suppression. Peak pulse current is 21.7A versus 22A in the original.

Q: Can SMBJP6KE20CA-TP be used as a direct replacement for P6SMB20C?

A: Yes. This part matches the original peak pulse current (22A) and provides the same clamping voltage (27.7V). The package form factor is identical (DO-214AA, SMB). The extended operating temperature range (-55°C to 175°C) provides additional thermal capability beyond the original specification.

Q: What is the difference between the two substitute parts?

A: The primary difference is peak pulse current: P6SMB20CA delivers 21.7A while SMBJP6KE20CA-TP delivers 22A, matching the original specification. SMBJP6KE20CA-TP also offers an extended upper operating temperature of 175°C versus 150°C. Both provide identical clamping voltage and reverse standoff voltage.

Q: Are all three parts in the same physical package?

A: Yes. All three parts use the DO-214AA (SMB) surface mount package, enabling direct PCB footprint compatibility.

Q: What compliance certifications apply to the substitute parts?

A: Both substitute parts are ROHS3 compliant. P6SMB20CA carries REACH Unaffected status. SMBJP6KE20CA-TP also carries REACH Unaffected status.

Q: Why is the P6SMB20C classified as obsolete?

A: The P6SMB20C is listed as obsolete by Littelfuse Inc. The substitute parts from Eaton and Micro Commercial Co are active products with ongoing manufacturing support and established supply availability.