P6SMBJ550 Equivalent & Substitute Parts

Part Overview

The P6SMBJ550 is a unidirectional 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 with 798V maximum clamping voltage and 600W peak pulse power handling capability in a DO-214AA (SMB) package.

The P6SMBJ550 is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Substiute Parts

P6SMBJ550

Littelfuse Inc.In Stock: 883P6SMBJ550 Datasheet

Current PartRFQ

P6SMB550A

Diotec SemiconductorIn Stock: 1360P6SMB550A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P6SMBJ550 is determined by the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff: 495V nominal
• Voltage - Clamping (Max) @ Ipp: Must not exceed 798V
• Current - Peak Pulse (10/1000µs): Minimum 790mA
• Power - Peak Pulse: 600W
• Package / Case: DO-214AA (SMB) surface mount
• Unidirectional configuration: Single channel Zener diode
• Type: Zener TVS diode for general-purpose protection

The P6SMB550A from Diotec Semiconductor meets these substitution criteria. Both devices share identical reverse standoff voltage, equivalent peak pulse power rating, compatible package geometry, and matching unidirectional Zener topology. Clamping voltage and peak pulse current remain within acceptable operational margins for direct substitution.

Parameter Comparison

Engineering Selection Recommendations

The P6SMB550A is a direct substitute for the obsolete P6SMBJ550. Both devices are classified as Zener-type unidirectional TVS diodes with identical 495V reverse standoff voltage and 600W peak pulse power rating in DO-214AA (SMB) surface-mount packages.

The P6SMB550A is currently in active production status, ensuring long-term component availability. The P6SMBJ550 is obsolete and no longer manufactured.

The P6SMB550A exhibits lower clamping voltage (760V versus 798V) and marginally lower peak pulse current (790mA versus 800mA), both of which represent improved performance characteristics for overvoltage suppression. The operating temperature range of the P6SMB550A (-50 to 150°C) is slightly narrower at the lower bound compared to the P6SMBJ550 (-55 to 150°C), a difference of 5°C that is typically non-critical for general-purpose protection applications.

Both devices carry EAR99 export classification and comply with applicable regulatory standards for their respective manufacturing origins.

Frequently Asked Questions (FAQ)

Q: Can the P6SMB550A directly replace the P6SMBJ550 in existing designs?

A: Yes. Both devices share identical reverse standoff voltage (495V), equivalent peak pulse power (600W), and matching DO-214AA (SMB) surface-mount package geometry. The P6SMB550A's lower clamping voltage and peak pulse current represent equivalent or improved performance for transient suppression.

Q: What is the significance of the clamping voltage difference between these parts?

A: The P6SMBJ550 clamps at 798V maximum, while the P6SMB550A clamps at 760V maximum. Lower clamping voltage provides more aggressive transient suppression, reducing peak voltage stress on protected circuitry. This difference is within normal manufacturing tolerance ranges for TVS diodes in this voltage class.

Q: Are there package compatibility concerns?

A: No. Both the P6SMBJ550 and P6SMB550A use the DO-214AA (SMB) surface-mount package. PCB footprints and reflow soldering profiles are identical.

Q: Why is the P6SMBJ550 listed as obsolete?

A: The P6SMBJ550 has been discontinued by Littelfuse Inc. The P6SMB550A from Diotec Semiconductor is the recommended active production alternative.

Q: Does the 5°C difference in minimum operating temperature affect substitution?

A: No. The P6SMB550A operates from -50°C to 150°C, while the P6SMBJ550 operates from -55°C to 150°C. For general-purpose protection applications, this 5°C difference at the lower temperature extreme is not a limiting factor in component selection.