P6SMBJ30A Equivalent & Substitute Parts

Part Overview

The P6SMBJ30A is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 25.6V reverse standoff voltage, 41.4V maximum clamping voltage, and 600W peak pulse power rating in a DO-214AA (SMB) package. The part is currently listed as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs or production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	25.6	V
Voltage - Breakdown (Min)	28.5	V
Voltage - Clamping (Max) @ Ipp	41.4	V
Current - Peak Pulse (10/1000µs)	14.7	A
Power - Peak Pulse	600	W
Operating Temperature Range	-55°C ~ 150°C	TJ
Package / Case	DO-214AA, SMB	-
Mounting Type	Surface Mount	-
Type	Zener	-
Unidirectional Channels	1	-

Substitute Part Grouping Explanation

Substitution of the P6SMBJ30A is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

Voltage - Reverse Standoff (Typ): 25.6V
Voltage - Breakdown (Min): 28.5V
Voltage - Clamping (Max) @ Ipp: 41.4V
Current - Peak Pulse (10/1000µs): 14.7A
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB
Unidirectional Channels: 1
Type: Zener

Secondary Compatibility Factors:

Operating Temperature Range: -55°C minimum to 150°C maximum
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant preferred for new designs

Substitute parts are grouped into two categories:

Category 1 - Direct Electrical Equivalents: Parts maintaining all primary equivalence criteria with identical clamping voltage (41.4V) and peak pulse current (14.7A).

Category 2 - Functional Equivalents with Parameter Variance: Parts meeting voltage standoff and breakdown specifications but with different clamping voltage or peak pulse current ratings. These parts provide equivalent overvoltage protection function but with different transient response characteristics.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package	Product Status	RoHS Status
P6SMBJ30A	Littelfuse	25.6V	28.5V	41.4V	14.7A	600W	-55°C ~ 150°C	DO-214AA, SMB	Obsolete	ROHS3 Compliant
P6SMB30A	Eaton - Electronics Division	25.6V	28.5V	41.4V	14.7A	600W	-55°C ~ 150°C	DO-214AA, SMB	Active	RoHS non-compliant
TPSMB30A	Littelfuse Inc.	25.6V	28.5V	41.4V	14.7A	600W	-65°C ~ 175°C	DO-214AA, SMB	Active	ROHS3 Compliant
SZP6SMB30AT3G	Littelfuse Inc.	25.6V	28.5V	41.4V	14.4A	600W	-65°C ~ 150°C	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJP6KE30A-TP	Micro Commercial Co	25.6V	28.5V	41.4V	14.7A	600W	-55°C ~ 175°C	DO-214AA, SMB	Active	ROHS3 Compliant
SM6T30A	STMicroelectronics	25.6V	28.5V	54.6V	75A (8/20µs)	600W	-55°C ~ 150°C	DO-214AA, SMB	Active	ROHS3 Compliant
SM6T30AY	STMicroelectronics	25.6V	28.5V	54.6V	75A (8/20µs)	600W	-55°C ~ 150°C	DO-214AA, SMB	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

TPSMB30A (Littelfuse Inc.) is the primary recommended substitute. This part maintains all electrical parameters of the P6SMBJ30A while offering extended operating temperature range (-65°C ~ 175°C), ROHS3 compliance, and AEC-Q101 automotive qualification. Product status is active with established supply availability.

SMBJP6KE30A-TP (Micro Commercial Co) provides equivalent electrical performance with extended upper operating temperature (175°C) and ROHS3 compliance. This part is suitable for applications requiring broader temperature operating range.

For RoHS Compliance Requirement:

P6SMB30A (Eaton - Electronics Division) matches all electrical specifications but carries RoHS non-compliant status. This part is suitable only for legacy applications or regions without RoHS restrictions.

For Automotive and Extended Temperature Applications:

SZP6SMB30AT3G (Littelfuse Inc.) is qualified to AEC-Q101 automotive standards with extended lower temperature rating (-65°C). Peak pulse current is 14.4A, representing a 2% reduction from the original 14.7A specification. This part is appropriate for automotive-grade designs requiring enhanced reliability qualification.

For Enhanced Transient Suppression (Higher Current Handling):

SM6T30A and SM6T30AY (STMicroelectronics) provide higher peak pulse current capability (75A at 8/20µs pulse) and elevated clamping voltage (54.6V). These parts are suitable for applications requiring enhanced transient energy absorption. SM6T30AY includes AEC-Q101 automotive qualification. Selection between these variants depends on automotive qualification requirement.

Frequently Asked Questions (FAQ)

Q: Can I use SM6T30A or SM6T30AY as direct replacements for P6SMBJ30A?

A: These parts share identical voltage standoff and breakdown specifications but differ in clamping voltage (54.6V vs. 41.4V) and peak pulse current (75A vs. 14.7A). They provide equivalent overvoltage protection function but with different transient response characteristics. Use only if circuit design accommodates higher clamping voltage and current handling.

Q: What is the difference between TPSMB30A and SZP6SMB30AT3G?

A: Both are Littelfuse products with identical clamping voltage and power ratings. TPSMB30A operates from -65°C to 175°C with 14.7A peak pulse current. SZP6SMB30AT3G operates from -65°C to 150°C with 14.4A peak pulse current and includes AEC-Q101 automotive qualification. Select TPSMB30A for extended upper temperature requirement; select SZP6SMB30AT3G for automotive applications.

Q: Is RoHS compliance required for my application?

A: If RoHS3 compliance is mandatory, use TPSMB30A, SZP6SMB30AT3G, SMBJP6KE30A-TP, SM6T30A, or SM6T30AY. Avoid P6SMB30A, which is RoHS non-compliant.

Q: Does package compatibility differ among substitute parts?

A: All listed substitute parts use DO-214AA (SMB) surface-mount package. Physical footprint and PCB layout compatibility are maintained across all alternatives.

Q: What is the significance of the 14.4A vs. 14.7A peak pulse current difference in SZP6SMB30AT3G?

A: The 0.3A reduction represents approximately 2% lower peak pulse current capability. This is within typical manufacturing tolerance ranges for TVS diodes. Verify circuit transient energy requirements to confirm adequacy for your application.

Q: Can I substitute based on voltage parameters alone?

A: No. While voltage standoff and breakdown specifications are identical across all listed parts, clamping voltage and peak pulse current vary significantly. Circuit protection effectiveness depends on all three voltage parameters and current handling capability. Verify complete electrical specification match before substitution.

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