P6SMBJ400 Equivalent & Substitute Parts

Part Overview

The P6SMBJ400 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 342V reverse standoff voltage and 575.4V maximum clamping voltage with 1.1A peak pulse current capability in a DO-214AA (SMB) package.

The P6SMBJ400 is classified as obsolete. Equivalent substitute parts are available from active product lines that maintain electrical and mechanical compatibility while offering improved availability and extended product support.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	342	V
Voltage - Breakdown (Min)	360	V
Voltage - Clamping (Max) @ Ipp	575.4	V
Current - Peak Pulse (10/1000µs)	1.1	A
Power - Peak Pulse	600	W
Operating Temperature Range	-55 to 150	°C
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitute parts for the P6SMBJ400 are qualified based on the following electrical and mechanical parameters:

Reverse standoff voltage: 342V (typical)
Peak pulse current: 1.1A
Power dissipation: 600W peak pulse
Package: DO-214AA / SMB surface mount
Diode type: Unidirectional Zener
Applications: General purpose overvoltage protection

The substitute parts SMBJP6KE400A-TP and P6SMB400A meet these core requirements. Variations in clamping voltage (548V vs. 575.4V) and operating temperature ranges remain within acceptable substitution parameters for this component category, as the reverse standoff voltage and peak pulse ratings are maintained.

Parameter Comparison

Parameter	P6SMBJ400 (Littelfuse)	SMBJP6KE400A-TP (Micro Commercial Co)	P6SMB400A (Eaton)
Voltage - Reverse Standoff (Typ)	342V	342V	342V
Voltage - Breakdown (Min)	360V	380V	380V
Voltage - Clamping (Max) @ Ipp	575.4V	548V	548V
Current - Peak Pulse (10/1000µs)	1.1A	1.1A	1.1A
Power - Peak Pulse	600W	600W	600W
Operating Temperature Range	-55 to 150°C	-55 to 175°C	-55 to 150°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Type	Zener	Zener	Zener
Unidirectional Channels	1	1	1
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

Both SMBJP6KE400A-TP and P6SMB400A are active product alternatives to the obsolete P6SMBJ400. Selection between these substitutes is based on availability, packaging format, and compliance requirements:

SMBJP6KE400A-TP (Micro Commercial Co) is supplied in Tape & Reel (TR) format with extended operating temperature range (-55 to 175°C) and ROHS3 compliance with REACH Unaffected status. This option is suitable for high-volume automated assembly and applications requiring extended thermal performance.

P6SMB400A (Eaton - Electronics Division) is supplied in Cut Tape (CT) and Digi-Reel® format with RoHS compliance. This option is recommended for applications requiring manufacturer-recommended equivalency and telecom-grade specifications.

Both parts maintain identical reverse standoff voltage (342V) and peak pulse current (1.1A) ratings. The clamping voltage differential (548V vs. 575.4V) represents a 4.8% reduction and remains within acceptable design margins for general-purpose transient suppression circuits.

Frequently Asked Questions (FAQ)

Q: Can P6SMB400A or SMBJP6KE400A-TP be used as direct replacements for P6SMBJ400?

A: Yes. Both parts maintain the critical electrical parameters: 342V reverse standoff voltage, 1.1A peak pulse current, and 600W peak pulse power rating. The DO-214AA / SMB package and surface-mount configuration are identical. The clamping voltage difference (548V vs. 575.4V) is within acceptable substitution tolerance for general-purpose overvoltage protection applications.

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

A: SMBJP6KE400A-TP offers extended operating temperature range (-55 to 175°C vs. -55 to 150°C) and is packaged in Tape & Reel format. P6SMB400A is packaged in Cut Tape and Digi-Reel® format. Both maintain identical voltage and current ratings. Selection depends on assembly process requirements and thermal operating conditions.

Q: Are there packaging compatibility concerns?

A: No. Both substitute parts use the same DO-214AA (SMB) surface-mount package as the original P6SMBJ400. Footprint and reflow soldering parameters are identical. Packaging format differences (Tape & Reel vs. Cut Tape) affect handling and assembly logistics only, not component performance or PCB compatibility.

Q: What compliance certifications apply to these substitutes?

A: SMBJP6KE400A-TP carries ROHS3 compliance and REACH Unaffected status. P6SMB400A carries RoHS compliance. Both parts are classified as EAR99 for export control purposes and share the same HTSUS code (8541.10.0080) as the original component.

Q: Is the clamping voltage difference significant?

A: The clamping voltage for substitute parts is 548V compared to 575.4V for the original P6SMBJ400, representing a 4.8% reduction. This difference remains within acceptable design margins for transient suppression circuits where the reverse standoff voltage (342V) is the primary design parameter. Circuit validation is recommended for applications with tight voltage margin requirements.

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