P4SMA68C Equivalent & Substitute Parts

Part Overview

The P4SMA68C 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 58.1V reverse standoff voltage with a 93.6V maximum clamping voltage and 4.5A peak pulse current capability in a DO-214AC (SMA) package. The part is currently listed as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement.

Substiute Parts

P4SMA68C

Littelfuse Inc.In Stock: 1191P4SMA68C Datasheet

Current PartRFQ

P4SMA68CA

Eaton - Electronics DivisionIn Stock: 7583P4SMA68CA Datasheet

MFR RecommendedRFQ

P4SMA68CA

Eaton - Electronics DivisionIn Stock: 7583P4SMA68CA Datasheet

MFR RecommendedRFQ

SMAJP4KE68CA-TP

Micro Commercial CoIn Stock: 804SMAJP4KE68CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the P4SMA68C is determined by matching the following critical electrical and mechanical parameters:

• Reverse standoff voltage: 58.1V (Typ)
• Peak pulse current: 4.5A
• Peak pulse power: 400W
• Package type: DO-214AC / SMA form factor
• Mounting configuration: Surface mount
• Zener diode type with single bidirectional channel

The identified substitute parts maintain these core specifications while operating within acceptable tolerance ranges for clamping voltage (92V–93.6V) and temperature performance. Substitutes are qualified based on electrical equivalence and physical compatibility with the original design footprint.

Parameter Comparison

Engineering Selection Recommendations

Both P4SMA68CA (Eaton) and SMAJP4KE68CA-TP (Micro Commercial Co) are active production alternatives to the obsolete P4SMA68C. Selection between these substitutes should be based on the following factors:

P4SMA68CA (Eaton - Electronics Division): This part maintains full electrical equivalence with a clamping voltage of 92V and is actively manufactured. It carries RoHS compliance certification and unlimited moisture sensitivity rating (MSL 1), making it suitable for standard manufacturing environments. The operating temperature range extends to 150°C, matching the original part's upper limit.

SMAJP4KE68CA-TP (Micro Commercial Co): This alternative offers an extended operating temperature range to 175°C, providing additional thermal margin for high-temperature applications. It maintains the same electrical specifications with 92V clamping voltage and 4.5A peak pulse current. REACH status is unaffected, indicating compliance with environmental regulations.

Both substitutes are electrically compatible with the original P4SMA68C design. The choice between them depends on application-specific requirements regarding temperature performance and supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can P4SMA68CA and SMAJP4KE68CA-TP be used interchangeably with P4SMA68C?

A: Yes, both parts are electrically equivalent substitutes. They maintain the same reverse standoff voltage (58.1V), peak pulse current (4.5A), and power dissipation (400W). All three parts use the DO-214AC (SMA) surface-mount package and are pin-compatible.

Q: What is the difference in clamping voltage between the original and substitute parts?

A: The P4SMA68C specifies a maximum clamping voltage of 93.6V, while both substitutes specify 92V. This 1.6V difference is within acceptable design margins for TVS diode applications and does not affect functional compatibility in standard overvoltage protection circuits.

Q: Are there temperature range differences I should consider?

A: The P4SMA68C operates from -65°C to 150°C. The P4SMA68CA operates from -55°C to 150°C, while SMAJP4KE68CA-TP extends to 175°C. If your application requires operation below -55°C, the original part specification should be reviewed. For standard industrial applications, both substitutes are suitable.

Q: Do all three parts have the same package footprint?

A: Yes. All three parts use the DO-214AC (SMA) surface-mount package, ensuring direct PCB footprint compatibility without layout modifications.

Q: What compliance certifications apply to these substitutes?

A: P4SMA68CA carries RoHS compliance certification. SMAJP4KE68CA-TP has REACH unaffected status. Both parts meet the ECCN EAR99 classification and HTSUS 8541.10.0080 tariff code, consistent with the original part.