P6SMBJ550C Equivalent & Substitute Parts

Part Overview

The P6SMBJ550C is a bidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 495V reverse standoff voltage and 798V maximum clamping voltage with 800mA peak pulse current capability in a DO-214AA (SMB) package.

The P6SMBJ550C is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this voltage suppression topology.

Substiute Parts

P6SMBJ550C

Littelfuse Inc.In Stock: 771P6SMBJ550C Datasheet

Current PartRFQ

SMBJP6KE550CA-TP

Micro Commercial CoIn Stock: 25594SMBJP6KE550CA-TP Datasheet

DirectRFQ

P6SMB550CA

Diotec SemiconductorIn Stock: 1766P6SMB550CA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the P6SMBJ550C is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): 495V
• Voltage - Clamping (Max) @ Ipp: Maximum 798V
• Current - Peak Pulse (10/1000µs): 800mA nominal
• Power - Peak Pulse: 600W
• Package / Case: DO-214AA (SMB)
• Mounting Type: Surface Mount
• Type: Zener, Bidirectional

Substitute parts must maintain electrical compatibility within these specifications. Variations in clamping voltage and peak pulse current within the specified ranges are acceptable provided the part remains functionally equivalent for the intended application. Package and mounting type must remain identical to ensure mechanical and thermal compatibility with existing PCB designs.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts maintain functional equivalence to the P6SMBJ550C within the specified electrical and mechanical parameters.

SMBJP6KE550CA-TP (Micro Commercial Co) is classified as Active product status with ROHS3 compliance certification. This part demonstrates superior long-term availability and supply chain stability. The extended operating temperature range (-55 to 175°C) provides additional thermal margin compared to the original component. Clamping voltage of 760V and peak pulse current of 800mA remain within acceptable substitution limits.

P6SMB550CA (Diotec Semiconductor) is classified as Active product status. RoHS compliance status is not applicable for this part. The operating temperature range (-50 to 150°C) matches the original specification lower bound. Peak pulse current of 790mA represents a minor reduction from the 800mA specification but remains functionally compatible. Clamping voltage of 760V is equivalent to the primary substitute option.

Both parts are packaged in DO-214AA (SMB) surface-mount configuration, ensuring direct mechanical and thermal compatibility with existing PCB layouts designed for the P6SMBJ550C.

Frequently Asked Questions (FAQ)

Q: Can SMBJP6KE550CA-TP and P6SMB550CA be used interchangeably with P6SMBJ550C?

A: Both parts meet the core electrical specifications for reverse standoff voltage (495V), clamping voltage (760V maximum), peak pulse current (790–800mA), and power dissipation (600W). Both are packaged in DO-214AA (SMB) surface mount. They are functionally equivalent for general-purpose transient voltage suppression applications.

Q: What is the significance of the clamping voltage difference between P6SMBJ550C (798V) and the substitute parts (760V)?

A: The clamping voltage represents the maximum voltage across the diode during a transient event at peak pulse current. The P6SMBJ550C specifies 798V maximum clamping, while both substitutes specify 760V maximum. This 38V difference is within acceptable engineering tolerance for TVS diode applications and does not compromise protection effectiveness in standard circuit designs.

Q: Are there packaging or moisture sensitivity differences between these parts?

A: All three parts use DO-214AA (SMB) surface-mount packaging. P6SMBJ550C and SMBJP6KE550CA-TP both specify Moisture Sensitivity Level (MSL) 1 (Unlimited). P6SMB550CA does not specify MSL. All parts are suitable for standard PCB assembly processes without special moisture handling requirements.

Q: Which substitute part offers the best long-term availability?

A: SMBJP6KE550CA-TP is classified as Active product status with 25,490 units in stock inventory. P6SMB550CA is also Active with 1,720 units in stock. Both represent significantly higher availability compared to the obsolete P6SMBJ550C. SMBJP6KE550CA-TP demonstrates superior inventory depth for sustained production requirements.

Q: Does operating temperature range affect substitution suitability?

A: P6SMBJ550C operates from -55 to 150°C. SMBJP6KE550CA-TP extends to -55 to 175°C, providing additional thermal margin. P6SMB550CA operates from -50 to 150°C. For applications operating within -55 to 150°C, all three parts are compatible. Applications requiring operation below -50°C should use SMBJP6KE550CA-TP or the original P6SMBJ550C.

Q: Are there compliance or certification differences?

A: P6SMBJ550C and SMBJP6KE550CA-TP are both ROHS3 compliant. P6SMB550CA does not specify RoHS compliance status. All three parts carry EAR99 export classification. For applications requiring RoHS certification, SMBJP6KE550CA-TP is the recommended substitute.