P4SMA550 Equivalent & Substitute Parts

Part Overview

The P4SMA550 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection in surface-mount applications. This component features a 495V reverse standoff voltage, 798V maximum clamping voltage, and 400W peak pulse power rating in a DO-214AC (SMA) package.

The P4SMA550 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Substiute Parts

P4SMA550

Littelfuse Inc.In Stock: 868P4SMA550 Datasheet

Current PartRFQ

P4SMA550A

Good-Ark SemiconductorIn Stock: 18454P4SMA550A Datasheet

DirectRFQ

P4SMA550A

Good-Ark SemiconductorIn Stock: 18454P4SMA550A Datasheet

DirectRFQ

SMAJP4KE550A-TP

Micro Commercial CoIn Stock: 5744SMAJP4KE550A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the P4SMA550 is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): 495V
• Voltage - Clamping (Max) @ Ipp: Maximum 798V
• Current - Peak Pulse (10/1000µs): 500mA
• Power - Peak Pulse: 400W
• Package / Case: DO-214AC (SMA)
• Unidirectional Channels: 1
• Type: Zener

Substitute parts must maintain electrical compatibility within these specifications and use the same surface-mount package. Two active substitute parts meet these criteria and are available in production quantities.

Parameter Comparison

Engineering Selection Recommendations

Both P4SMA550A (Good-Ark Semiconductor) and SMAJP4KE550A-TP (Micro Commercial Co) are active production alternatives to the obsolete P4SMA550.

The P4SMA550A maintains identical reverse standoff voltage (495V) and peak pulse current (500mA) specifications. The clamping voltage is reduced from 798V to 760V, and the minimum breakdown voltage increases from 496.38V to 522.5V. Operating temperature range is -55 to 150°C. This part is available in high inventory (18400 pcs) with ROHS3 compliance and REACH unaffected status.

The SMAJP4KE550A-TP also maintains the 495V reverse standoff voltage and 500mA peak pulse current. Clamping voltage is 760V with minimum breakdown voltage of 522.5V. This part offers an extended operating temperature range of -55 to 175°C and is available in 5649 pcs with ROHS3 compliance and REACH unaffected status.

Both substitutes are surface-mount DO-214AC package variants and support equivalent PCB assembly processes. Selection between these two parts depends on application-specific temperature requirements and inventory availability.

Frequently Asked Questions (FAQ)

Q: Can P4SMA550A or SMAJP4KE550A-TP be used as direct replacements for P4SMA550?

A: Both parts are electrical and mechanical equivalents within the specified parameter tolerances. They share the same reverse standoff voltage (495V), peak pulse current (500mA), and power rating (400W). The clamping voltage differs slightly (760V vs. 798V), which is within acceptable substitution margins for general-purpose transient voltage suppression. Both use the DO-214AC surface-mount package and are compatible with existing PCB designs.

Q: What is the difference between P4SMA550A and SMAJP4KE550A-TP?

A: Both parts meet the core electrical specifications for substitution. The primary differences are: (1) P4SMA550A operates from -55 to 150°C, while SMAJP4KE550A-TP extends to 175°C; (2) P4SMA550A is available in significantly higher inventory (18400 pcs vs. 5649 pcs); (3) Manufacturer differences (Good-Ark vs. Micro Commercial Co). Selection should be based on application temperature requirements and supply chain considerations.

Q: Are there any package compatibility concerns?

A: Both substitute parts use DO-214AC surface-mount packages. P4SMA550A uses standard SMA designation, while SMAJP4KE550A-TP uses SMAJ designation. Both are mechanically and electrically compatible with DO-214AC footprints on PCBs. No design modifications are required for package substitution.

Q: What compliance certifications apply to these substitute parts?

A: All three parts (original and substitutes) are ROHS3 compliant. P4SMA550A and SMAJP4KE550A-TP both carry REACH unaffected status, confirming regulatory compliance for European and international markets.

Q: Why does the clamping voltage differ between the original and substitute parts?

A: The P4SMA550 specifies a maximum clamping voltage of 798V, while both substitutes specify 760V. This difference reflects manufacturing variations within the TVS diode product line. Both values remain within acceptable transient suppression performance for general-purpose applications. The lower clamping voltage of the substitutes provides equivalent or improved protection characteristics.