P4SMA550A Equivalent & Substitute Parts

Part Overview

The P4SMA550A is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection in surface-mount applications. The device features a 495V reverse standoff voltage with 760V maximum clamping voltage and 400W peak pulse power rating. The part is Active status and widely stocked, with 18,400 units available in Tape & Reel packaging. Equivalent and substitute parts are identified to support procurement flexibility, supply chain continuity, and design standardization across manufacturing environments.

Substiute Parts

P4SMA550A

Littelfuse Inc.In Stock: 18471P4SMA550A Datasheet

Current PartRFQ

P4SMA550A

Good-Ark SemiconductorIn Stock: 18454P4SMA550A Datasheet

MFR RecommendedRFQ

SMAJP4KE550A-TP

Micro Commercial CoIn Stock: 5744SMAJP4KE550A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the P4SMA550A are qualified based on strict electrical and mechanical parameter matching within the TVS diode category. The substitution criteria are:

Critical Matching Parameters:

• Voltage - Reverse Standoff (Typ): 495V
• Voltage - Breakdown (Min): 522.5V
• Voltage - Clamping (Max) @ Ipp: 760V
• Current - Peak Pulse (10/1000µs): 500mA
• Power - Peak Pulse: 400W
• Type: Zener, Unidirectional (1 channel)
• Package / Case: DO-214AC, SMA
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant

Two substitute parts meet these criteria: P4SMA550A (Good-Ark Semiconductor) and SMAJP4KE550A-TP (Micro Commercial Co). Both maintain identical electrical performance specifications and package compatibility with the original Littelfuse device.

Parameter Comparison

Engineering Selection Recommendations

All three parts—P4SMA550A (Littelfuse), P4SMA550A (Good-Ark Semiconductor), and SMAJP4KE550A-TP (Micro Commercial Co)—are Active status products with ROHS3 compliance and REACH Unaffected certification. Selection between these parts should be based on:

Procurement Availability: The Littelfuse and Good-Ark variants each maintain 18,400 units in stock, providing equivalent supply security. The Micro Commercial Co part has lower inventory at 5,649 units.

Operating Temperature Range: The Littelfuse part supports -65°C to 150°C, while both substitute parts support -55°C to 150°C (Good-Ark) or -55°C to 175°C (MCC). Applications requiring operation below -55°C require the original Littelfuse part.

Package Designation: The Littelfuse and Good-Ark parts use DO-214AC (SMA) designation, while the MCC part uses DO-214AC (SMAJ) designation. Both are mechanically and electrically compatible surface-mount packages.

Regulatory Compliance: All three parts meet identical compliance requirements (ROHS3, REACH Unaffected, ECCN EAR99).

Frequently Asked Questions (FAQ)

Q: Can SMAJP4KE550A-TP replace P4SMA550A in all applications?

A: Yes, for applications operating within -55°C to 175°C. The electrical specifications (voltage, current, power) are identical. The package designations (SMA vs. SMAJ) refer to the same DO-214AC physical form factor and are mechanically interchangeable on standard PCB layouts.

Q: What is the difference between P4SMA550A from Littelfuse and P4SMA550A from Good-Ark Semiconductor?

A: Both parts are electrically and mechanically identical with matching part numbers. The primary difference is manufacturer and operating temperature range. Good-Ark's variant supports -55°C to 150°C versus Littelfuse's -65°C to 150°C. Selection depends on application temperature requirements and preferred supplier qualification.

Q: Are there any compatibility issues with PCB assembly when substituting these parts?

A: No. All three parts use the DO-214AC surface-mount package with identical footprints and solder pad configurations. Standard pick-and-place equipment and reflow processes are compatible across all variants.

Q: Which part should be selected for lowest cost?

A: Cost comparison is not provided in the technical specifications. Procurement decisions should be based on supplier pricing, volume discounts, and lead time availability.

Q: Do all substitute parts meet the same compliance standards?

A: Yes. All three parts are ROHS3 Compliant, REACH Unaffected, and classified as ECCN EAR99. Moisture Sensitivity Level is 1 (Unlimited) for all variants.