P4SMA6.8 Equivalent & Substitute Parts

Part Overview

The P4SMA6.8 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 5.8V reverse standoff voltage and 11.03V maximum clamping voltage with 39A peak pulse current capability in a DO-214AC (SMA) package. The P4SMA6.8 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Substiute Parts

P4SMA6.8

Littelfuse Inc.In Stock: 1054P4SMA6.8 Datasheet

Current PartRFQ

P4SMA6.8A

Taiwan Semiconductor CorporationIn Stock: 1816P4SMA6.8A Datasheet

MFR RecommendedRFQ

P4SMA6.8A

Taiwan Semiconductor CorporationIn Stock: 1816P4SMA6.8A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P4SMA6.8 is determined by the following critical electrical and mechanical parameters:

• Reverse Standoff Voltage (Typ): 5.8V — must remain constant
• Package Type: DO-214AC (SMA) — surface-mount compatibility requirement
• Unidirectional Configuration: Single channel Zener diode
• Clamping Voltage Range: Maximum 11.03V @ Ipp
• Peak Pulse Current: Minimum 39A capability
• Power Dissipation: 400W peak pulse rating
• Operating Temperature Range: -65°C to 150°C minimum

The substitute part P4SMA6.8A from Taiwan Semiconductor Corporation maintains electrical equivalence within these parameters while offering active product status and improved availability.

Parameter Comparison

Engineering Selection Recommendations

The P4SMA6.8A from Taiwan Semiconductor Corporation is the direct equivalent substitute for the obsolete P4SMA6.8. Selection of this substitute is supported by:

• Product Status: Active manufacturing status ensures long-term availability and supply chain continuity
• Electrical Equivalence: Identical reverse standoff voltage (5.8V) and compatible clamping characteristics within acceptable tolerance
• Compliance: Both parts maintain ROHS3 compliance and identical moisture sensitivity ratings
• Performance: The substitute delivers equivalent or superior electrical performance with 40A peak pulse current versus 39A, and lower maximum clamping voltage (10.5V versus 11.03V)
• Package Compatibility: Identical DO-214AC (SMA) surface-mount package ensures direct PCB layout compatibility

The P4SMA6.8A is suitable for direct replacement in all applications where the P4SMA6.8 was originally specified.

Frequently Asked Questions (FAQ)

Q: Can the P4SMA6.8A be used as a direct replacement for P4SMA6.8?

A: Yes. Both parts share identical reverse standoff voltage (5.8V), package type (DO-214AC/SMA), and power rating (400W). The P4SMA6.8A offers superior peak pulse current (40A versus 39A) and lower clamping voltage (10.5V versus 11.03V), making it electrically compatible for direct substitution.

Q: What is the difference in clamping voltage between these parts?

A: The P4SMA6.8 has a maximum clamping voltage of 11.03V, while the P4SMA6.8A is rated at 10.5V maximum. This 0.53V difference represents improved clamping performance in the substitute part and does not affect compatibility in general-purpose overvoltage protection applications.

Q: Are there package differences between P4SMA6.8 and P4SMA6.8A?

A: No. Both parts use the identical DO-214AC (SMA) surface-mount package. PCB footprints, soldering procedures, and assembly processes remain unchanged.

Q: What is the operating temperature range difference?

A: The P4SMA6.8 operates from -65°C to 150°C, while the P4SMA6.8A operates from -55°C to 150°C. For applications requiring operation below -55°C, the original P4SMA6.8 specification must be maintained. For standard industrial and commercial temperature ranges, the P4SMA6.8A is fully compatible.

Q: Why is the P4SMA6.8 classified as obsolete?

A: Obsolete status indicates that Littelfuse Inc. has discontinued manufacturing this part. The P4SMA6.8A provides functional and electrical equivalence with active production status, ensuring availability for new designs and production continuity.

Q: Are both parts RoHS compliant?

A: Yes. Both the P4SMA6.8 and P4SMA6.8A are ROHS3 compliant with MSL rating of 1 (Unlimited), meeting environmental and regulatory requirements for electronic component manufacturing.