P4SMA550C Equivalent & Substitute Parts

Part Overview

The P4SMA550C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection in surface-mount applications. This component operates with a reverse standoff voltage of 495V and provides 400W peak pulse power dissipation in a compact DO-214AC (SMA) package. The P4SMA550C is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement.

Substiute Parts

P4SMA550C

LittelfuseIn Stock: 894P4SMA550C Datasheet

Current PartRFQ

P4SMA550CA

Littelfuse Inc.In Stock: 3459P4SMA550CA Datasheet

DirectRFQ

P4SMA550CA

Littelfuse Inc.In Stock: 3459P4SMA550CA Datasheet

DirectRFQ

SMAJP4KE550CA-TP

Micro Commercial CoIn Stock: 902SMAJP4KE550CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P4SMA550C is determined by strict equivalence across the following electrical and mechanical parameters:

• Reverse standoff voltage: 495V (nominal)
• Peak pulse current rating: 500mA
• Peak pulse power dissipation: 400W
• Bidirectional configuration: 1 channel
• Package type: DO-214AC (SMA form factor)
• Mounting method: Surface mount
• Zener diode type classification

The substitute parts identified maintain these core specifications while differing in clamping voltage characteristics and product status. The P4SMA550CA represents a direct Littelfuse equivalent with active product status. The SMAJP4KE550CA-TP, manufactured by Micro Commercial Co, provides an alternative from a different manufacturer while maintaining electrical and mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

The P4SMA550CA is the primary substitute for the obsolete P4SMA550C. Both components are manufactured by Littelfuse, maintain identical reverse standoff voltage and peak pulse ratings, and are ROHS3 compliant. The P4SMA550CA is actively produced and available in Tape & Reel packaging, supporting high-volume manufacturing workflows.

The SMAJP4KE550CA-TP, manufactured by Micro Commercial Co, serves as a secondary alternative. This part maintains electrical equivalence across standoff voltage, peak pulse current, and power dissipation. The extended operating temperature range (-55°C ~ 175°C) provides broader thermal performance compared to the original specification. Bulk packaging is available for this variant.

Both substitute parts are classified as active products, ensuring long-term availability and supply chain stability compared to the obsolete P4SMA550C.

Frequently Asked Questions (FAQ)

Q: Can P4SMA550CA directly replace P4SMA550C in existing designs?

A: Yes. The P4SMA550CA maintains identical reverse standoff voltage (495V), peak pulse current (500mA), and power dissipation (400W) specifications. Both use the DO-214AC (SMA) package for surface-mount applications. The primary difference is product status: P4SMA550CA is active while P4SMA550C is obsolete.

Q: What is the difference in clamping voltage between the main part and substitutes?

A: The P4SMA550C specifies a maximum clamping voltage of 798V at peak pulse current. Both substitute parts (P4SMA550CA and SMAJP4KE550CA-TP) specify 760V clamping voltage. This represents a lower clamping characteristic in the substitute parts.

Q: Is SMAJP4KE550CA-TP compatible with P4SMA550C applications?

A: The SMAJP4KE550CA-TP maintains electrical equivalence in standoff voltage, peak pulse current, and power dissipation. The extended operating temperature range (-55°C ~ 175°C) exceeds the original specification (-65°C ~ 150°C). Both components use DO-214AC package form factors suitable for surface-mount assembly.

Q: What packaging options are available for substitute parts?

A: P4SMA550CA is supplied in Tape & Reel (TR) packaging, standard for automated assembly processes. SMAJP4KE550CA-TP is available in Bulk packaging. Selection depends on production volume and assembly equipment compatibility.

Q: Are substitute parts RoHS compliant?

A: P4SMA550CA is ROHS3 compliant, matching the original P4SMA550C specification. RoHS compliance status for SMAJP4KE550CA-TP is not specified in available documentation.