P6SMB400 Equivalent & Substitute Parts

Part Overview

The P6SMB400 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 342V reverse standoff voltage, 575.4V maximum clamping voltage, and 600W peak pulse power rating in a surface-mount DO-214AA (SMB) package. The part is currently classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Reverse Standoff Voltage (Typ)	342V
Breakdown Voltage (Min)	360V
Clamping Voltage (Max) @ Ipp	575.4V
Peak Pulse Current (10/1000µs)	1.1A
Peak Pulse Power	600W
Unidirectional Channels	1
Operating Temperature Range	-55°C ~ 150°C (TJ)
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the P6SMB400 is determined by strict equivalence across the following critical parameters:

Reverse Standoff Voltage: 342V (Typ) — all substitutes maintain this specification
Peak Pulse Current: 1.1A (10/1000µs) — consistent across all alternatives
Peak Pulse Power: 600W — maintained in all substitute parts
Package / Case: DO-214AA, SMB — identical surface-mount form factor
Unidirectional Configuration: Single channel TVS diode topology
Mounting Type: Surface Mount — compatible with existing PCB designs

The substitute parts listed below meet these core electrical and mechanical requirements. Variations in clamping voltage (548V vs. 575.4V) and breakdown voltage specifications remain within acceptable tolerance ranges for the application category while maintaining functional equivalence.

Parameter Comparison

Parameter	P6SMB400 (Main)	P6SMB400A (Eaton)	P6SMB400AHE3_ALL (Vishay)	SMBJP6KE400A-TP (MCC)
Manufacturer	Littelfuse Inc.	Eaton - Electronics Division	Vishay General Semiconductor	Micro Commercial Co
Reverse Standoff Voltage (Typ)	342V	342V	342V	342V
Breakdown Voltage (Min)	360V	380V	380V	380V
Clamping Voltage (Max) @ Ipp	575.4V	548V	548V	548V
Peak Pulse Current (10/1000µs)	1.1A	1.1A	1.1A	1.1A
Peak Pulse Power	600W	600W	600W	600W
Operating Temperature Range	-55°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 175°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

P6SMB400A (Eaton - Electronics Division) — MFR Recommended substitute. Active product status with established supply chain. RoHS compliant. Suitable for telecom applications. Standard operating temperature range (-55°C ~ 150°C) matches original specification.

P6SMB400AHE3_ALL (Vishay General Semiconductor) — Direct manufacturer alternative with automotive-grade qualification (AEC-Q101). Extended lower operating temperature limit (-65°C ~ 150°C) provides additional thermal margin. ROHS3 compliant. Recommended for applications requiring automotive-grade reliability or extended temperature performance.

SMBJP6KE400A-TP (Micro Commercial Co) — Active product with extended upper operating temperature rating (-55°C ~ 175°C). ROHS3 compliant. Suitable for general-purpose applications requiring higher temperature tolerance. Tape & Reel packaging available.

All three substitute parts maintain electrical equivalence with the obsolete P6SMB400 across critical parameters: 342V standoff voltage, 1.1A peak pulse current, 600W peak pulse power, and DO-214AA surface-mount package compatibility.

Frequently Asked Questions (FAQ)

Q: Can P6SMB400A be used as a direct replacement for P6SMB400?

A: Yes. Both parts share identical reverse standoff voltage (342V), peak pulse current (1.1A), peak pulse power (600W), and DO-214AA package specifications. The primary difference is clamping voltage: P6SMB400A specifies 548V maximum versus P6SMB400's 575.4V maximum. This variation remains within acceptable tolerance for the TVS diode application category.

Q: What is the difference between P6SMB400AHE3_ALL and P6SMB400A?

A: Both maintain identical electrical specifications (342V standoff, 1.1A peak current, 600W power, 548V clamping). P6SMB400AHE3_ALL includes automotive-grade qualification (AEC-Q101) and extended lower temperature rating (-65°C vs. -55°C minimum). Selection depends on application requirements for automotive compliance or enhanced low-temperature performance.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts use DO-214AA (SMB) surface-mount package. PCB footprint compatibility is maintained across all alternatives. Packaging format varies by supplier: Eaton offers Cut Tape & Digi-Reel, Vishay provides standard DO-214AA, and Micro Commercial Co supplies Tape & Reel format.

Q: Which substitute has the best temperature performance?

A: SMBJP6KE400A-TP offers the widest operating temperature range (-55°C ~ 175°C), providing 25°C additional margin at the upper limit compared to standard specifications. P6SMB400AHE3_ALL extends the lower temperature limit to -65°C for enhanced cold-temperature performance.

Q: Are all substitutes RoHS compliant?

A: Yes. All substitute parts carry RoHS compliance certification: P6SMB400A (RoHS Compliant), P6SMB400AHE3_ALL (ROHS3 Compliant), and SMBJP6KE400A-TP (ROHS3 Compliant).

Q: What is the primary reason to substitute the P6SMB400?

A: The P6SMB400 is classified as obsolete. All listed substitute parts maintain active product status with established supply chains, ensuring long-term availability and design continuity.

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