P4SMA6.8C Equivalent & Substitute Parts

Part Overview

The P4SMA6.8C 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 5.8V reverse standoff voltage, 11.03V maximum clamping voltage, and 39A peak pulse current capability in a DO-214AC (SMA) package. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement.

Substiute Parts

P4SMA6.8C

Littelfuse Inc.In Stock: 1213P4SMA6.8C Datasheet

Current PartRFQ

P4SMA6.8CA

Taiwan Semiconductor CorporationIn Stock: 17164P4SMA6.8CA Datasheet

MFR RecommendedRFQ

P4SMA6.8CA

Taiwan Semiconductor CorporationIn Stock: 17164P4SMA6.8CA Datasheet

MFR RecommendedRFQ

SMAJP4KE6.8CA-TP

Micro Commercial CoIn Stock: 1003SMAJP4KE6.8CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P4SMA6.8C is determined by the following critical parameters:

• Reverse Standoff Voltage: Must remain 5.8V (Typ) to maintain circuit protection threshold
• Clamping Voltage: Maximum allowable clamping voltage at peak pulse current; substitute parts must not exceed the original specification to prevent overvoltage stress on protected circuits
• Peak Pulse Current: Minimum 39A capability required for adequate transient suppression
• Package / Case: DO-214AC (SMA) surface-mount package for mechanical and electrical compatibility
• Bidirectional Channels: Single channel configuration for symmetric voltage suppression
• Type: Zener diode technology for TVS application

Substitute parts P4SMA6.8CA and SMAJP4KE6.8CA-TP maintain these critical parameters within acceptable engineering tolerances while offering active product status and improved availability.

Parameter Comparison

Engineering Selection Recommendations

P4SMA6.8CA (Taiwan Semiconductor Corporation) is the primary recommended substitute. This part maintains identical reverse standoff voltage (5.8V), achieves lower clamping voltage (10.5V vs 11.03V), and provides equivalent peak pulse current (40A vs 39A). The part carries active product status with ROHS3 compliance and demonstrates superior inventory availability (17,068 units). The reduced operating temperature minimum (-55°C vs -65°C) is acceptable for most general-purpose applications.

SMAJP4KE6.8CA-TP (Micro Commercial Co) serves as a secondary alternative. This part maintains critical electrical parameters with 10.5V clamping voltage and 39A peak pulse current. Extended operating temperature range (-55°C ~ 175°C) provides additional thermal margin. The DO-214AC (SMAJ) package variant is mechanically compatible with standard DO-214AC footprints. Active product status and REACH compliance support long-term availability.

Both substitutes are suitable for direct replacement in applications where the P4SMA6.8C is currently specified, provided circuit design accommodates the lower clamping voltage characteristic.

Frequently Asked Questions (FAQ)

Q: Can P4SMA6.8CA be used as a direct replacement for P4SMA6.8C?

A: Yes. Both parts maintain the same 5.8V reverse standoff voltage and 400W peak pulse power rating. The P4SMA6.8CA achieves lower clamping voltage (10.5V vs 11.03V), which provides improved transient suppression performance. Peak pulse current is equivalent or superior (40A vs 39A).

Q: What is the significance of the lower clamping voltage in substitute parts?

A: Lower clamping voltage reduces the maximum voltage stress applied to protected circuit components during transient events. This characteristic improves protection effectiveness without requiring circuit redesign, as the reverse standoff voltage remains constant at 5.8V.

Q: Are the DO-214AC (SMA) and DO-214AC (SMAJ) packages interchangeable?

A: Yes. Both designations refer to the same physical package footprint used for surface-mount TVS diodes. The SMAJ variant designation indicates manufacturer-specific packaging, but electrical and mechanical compatibility with standard DO-214AC footprints is maintained.

Q: Does the reduced operating temperature minimum (-55°C vs -65°C) affect general-purpose applications?

A: For most general-purpose overvoltage protection applications, the -55°C minimum operating temperature is sufficient. Applications requiring operation below -55°C should retain the original P4SMA6.8C specification or confirm substitute part suitability through design review.

Q: What is the inventory status difference between substitute options?

A: P4SMA6.8CA demonstrates significantly higher inventory availability (17,068 units) compared to SMAJP4KE6.8CA-TP (957 units). For procurement planning, P4SMA6.8CA is the preferred choice for volume requirements and long-term supply assurance.

Q: Are both substitute parts RoHS compliant?

A: P4SMA6.8CA carries explicit ROHS3 compliance certification. SMAJP4KE6.8CA-TP compliance status is not specified in available documentation. For applications requiring RoHS certification, P4SMA6.8CA is the recommended selection.