Equivalent & Substitute Parts for P6SMB550C

Part Overview

The P6SMB550C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component operates with a reverse standoff voltage of 468V and provides 600W peak pulse power dissipation in a DO-214AA (SMB) package. The P6SMB550C is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement continuity.

Substiute Parts

P6SMB550C

Littelfuse Inc.In Stock: 1153P6SMB550C Datasheet

Current PartRFQ

P6SMB550CA

Diotec SemiconductorIn Stock: 1766P6SMB550CA Datasheet

DirectRFQ

P6SMB550CA

Diotec SemiconductorIn Stock: 1766P6SMB550CA Datasheet

DirectRFQ

SMBJ495CA

Bourns Inc.In Stock: 4146SMBJ495CA Datasheet

MFR RecommendedRFQ

SMBJP6KE550CA-TP

Micro Commercial CoIn Stock: 25594SMBJP6KE550CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P6SMB550C is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Bidirectional TVS diode topology (1 channel)
• Reverse standoff voltage range: 468V nominal (acceptable range 495V minimum breakdown)
• Peak pulse current capability: 800mA
• Peak pulse power dissipation: 600W
• Clamping voltage performance: maximum 798V @ Ipp

Mechanical Equivalence Criteria:

• Package type: DO-214AA (SMB) surface mount
• Mounting configuration: Surface mount

Compliance Criteria:

• RoHS3 compliance preferred for new designs
• Operating temperature range: -55°C to 150°C minimum

All substitute parts listed below meet these criteria within the specified parameter tolerances.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: SMBJ495CA (Bourns Inc.)

The SMBJ495CA is the recommended substitute for the obsolete P6SMB550C. This part maintains electrical equivalence across all critical parameters: 495V reverse standoff voltage, 800mA peak pulse current, 600W power dissipation, and 760V clamping voltage. The SMBJ495CA carries ROHS3 compliance certification and operates across the full temperature range (-55°C to 150°C) required by the original specification. Active product status ensures long-term availability and supply chain stability.

Secondary Substitute: SMBJP6KE550CA-TP (Micro Commercial Co)

The SMBJP6KE550CA-TP provides equivalent electrical performance with extended operating temperature capability (-55°C to 175°C). This part meets all electrical substitution criteria and carries ROHS3 compliance. The extended temperature range offers additional design margin for applications requiring operation beyond standard industrial limits. Tape & Reel packaging is standard for this part.

Alternative Substitute: P6SMB550CA (Diotec Semiconductor)

The P6SMB550CA maintains mechanical and electrical compatibility with the original part. Peak pulse current is specified at 790mA, which is within acceptable tolerance for the 800mA requirement. Operating temperature range is -50°C to 150°C, which covers standard industrial applications but does not extend to the lower -55°C limit of the original specification. This part is suitable for applications where the -50°C minimum temperature is acceptable.

Frequently Asked Questions (FAQ)

Q: Can I use SMBJ495CA as a direct replacement for P6SMB550C?

A: Yes. The SMBJ495CA meets all electrical and mechanical substitution criteria. Both parts are bidirectional TVS diodes in DO-214AA (SMB) packages with 495V reverse standoff voltage, 800mA peak pulse current, and 600W power dissipation. The clamping voltage of 760V is lower than the original 798V, providing improved protection margin. ROHS3 compliance and active product status make this the preferred substitute.

Q: What is the difference between the three substitute parts?

A: All three substitutes meet the core electrical requirements. SMBJ495CA (Bourns) and SMBJP6KE550CA-TP (MCC) both specify 800mA peak pulse current and carry ROHS3 compliance. SMBJP6KE550CA-TP offers extended temperature operation to 175°C. P6SMB550CA (Diotec) specifies 790mA peak pulse current and does not carry ROHS3 compliance designation. Selection depends on temperature requirements and compliance mandates for your application.

Q: Does the lower clamping voltage of substitute parts affect circuit protection?

A: No. The substitute parts specify 760V clamping voltage compared to 798V for the original P6SMB550C. Lower clamping voltage provides faster transient suppression and improved protection performance. This represents a design improvement rather than a limitation.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts use the DO-214AA (SMB) surface-mount package, ensuring mechanical compatibility with existing PCB layouts and assembly processes.

Q: Which substitute should I select for new designs?

A: For new designs, SMBJ495CA (Bourns Inc.) is the recommended choice. This part combines active product status, ROHS3 compliance, full temperature range operation (-55°C to 150°C), and proven availability. SMBJP6KE550CA-TP is suitable if extended temperature operation to 175°C is required.