P6SMBJ300 Equivalent & Substitute Parts

Part Overview

The P6SMBJ300 is a Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose voltage protection applications. This unidirectional zener diode operates with a reverse standoff voltage of 256V and provides clamping protection at 434.7V maximum. The component is packaged in DO-214AA (SMB) surface mount configuration with a peak pulse power rating of 600W.

The P6SMBJ300 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

P6SMBJ300

Littelfuse Inc.In Stock: 961P6SMBJ300 Datasheet

Current PartRFQ

SMBJP6KE300A-TP

Micro Commercial CoIn Stock: 24153SMBJP6KE300A-TP Datasheet

DirectRFQ

P6SMB300A

Eaton - Electronics DivisionIn Stock: 74049P6SMB300A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P6SMBJ300 is determined by the following critical electrical and mechanical parameters:

• Reverse Standoff Voltage (Typ): 256V — must match exactly
• Unidirectional Channels: 1 — single channel configuration required
• Current - Peak Pulse (10/1000µs): 1.5A — must match exactly
• Power - Peak Pulse: 600W — must match exactly
• Mounting Type: Surface Mount — required for PCB compatibility
• Package / Case: DO-214AA, SMB — physical and electrical footprint compatibility

Substitute parts must maintain these parameters within the specified tolerances. Voltage clamping characteristics may vary within acceptable engineering limits while preserving the core protection function. Operating temperature range and compliance certifications are secondary selection criteria.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts meet the critical electrical parameters required for direct replacement of the P6SMBJ300:

SMBJP6KE300A-TP (Micro Commercial Co) — Active product status with extended operating temperature range (-55°C ~ 175°C). ROHS3 compliant. Packaged in Tape & Reel format. Voltage clamping at 414V is 20.7V lower than the original specification, representing a 4.8% reduction in maximum clamping voltage. This part is suitable for applications where extended temperature performance is required.

P6SMB300A (Eaton - Electronics Division) — Active product status with operating temperature range matching the original specification (-55°C ~ 150°C). RoHS compliant. Packaged in Tape & Reel format. Voltage clamping at 414V matches the SMBJP6KE300A-TP specification. This part maintains thermal performance parity with the original P6SMBJ300 while offering active product availability.

Both substitutes are electrically and mechanically compatible with the original design. Selection between them depends on application-specific temperature requirements and supplier availability.

Frequently Asked Questions (FAQ)

Q: Can SMBJP6KE300A-TP and P6SMB300A be used interchangeably with P6SMBJ300?

A: Yes. Both substitute parts maintain the critical electrical parameters: 256V reverse standoff voltage, 1.5A peak pulse current, and 600W peak pulse power. Both are surface mount components in DO-214AA/SMB package configuration. The voltage clamping difference (414V vs. 434.7V) represents a 4.8% variation within acceptable engineering tolerance for TVS diode applications.

Q: What is the significance of the voltage clamping difference?

A: The P6SMBJ300 specifies maximum clamping at 434.7V, while both substitutes clamp at 414V. This 20.7V difference indicates tighter clamping performance in the substitute parts, which provides enhanced protection margins in transient suppression circuits. This is a favorable characteristic for component replacement.

Q: Are there packaging differences between the substitutes?

A: Both SMBJP6KE300A-TP and P6SMB300A are supplied in Tape & Reel packaging, suitable for automated assembly. The original P6SMBJ300 packaging specification was not provided. Both substitutes use standard DO-214AA (SMB) surface mount footprints compatible with existing PCB designs.

Q: Which substitute should be selected for high-temperature applications?

A: SMBJP6KE300A-TP supports operating temperatures up to 175°C (junction), compared to 150°C for P6SMB300A and the original P6SMBJ300. Selection of SMBJP6KE300A-TP is appropriate for applications requiring extended thermal performance.

Q: Are both substitutes RoHS compliant?

A: Yes. SMBJP6KE300A-TP is ROHS3 compliant. P6SMB300A is RoHS compliant. Both meet environmental and regulatory requirements for electronic component use.