P6SMB30AT3G Equivalent & Substitute Parts

Part Overview

The P6SMB30AT3G is a unidirectional Zener 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 14.4A peak pulse current capability in the SMB (DO-214AA) package format. The part is currently classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for ongoing production and field replacement requirements.

Substiute Parts

P6SMB30AT3G

LittelfuseIn Stock: 10229P6SMB30AT3G Datasheet

Current PartRFQ

1KSMB30A

Taiwan Semiconductor CorporationIn Stock: 91221KSMB30A Datasheet

MFR RecommendedRFQ

P6SMB30A

Eaton - Electronics DivisionIn Stock: 25016P6SMB30A Datasheet

MFR RecommendedRFQ

TPSMB30A

Littelfuse Inc.In Stock: 1466TPSMB30A Datasheet

MFR RecommendedRFQ

P6SMB30A

Eaton - Electronics DivisionIn Stock: 25016P6SMB30A Datasheet

MFR RecommendedRFQ

SM6T30A

STMicroelectronicsIn Stock: 37818SM6T30A Datasheet

MFR RecommendedRFQ

SM6T30AY

STMicroelectronicsIn Stock: 1407SM6T30AY Datasheet

MFR RecommendedRFQ

SMBJP6KE30A-TP

Micro Commercial CoIn Stock: 9348SMBJP6KE30A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the P6SMB30AT3G is determined by strict alignment of the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Voltage - Reverse Standoff (Typ): 25.6V
• Voltage - Breakdown (Min): 28.5V
• Voltage - Clamping (Max) @ Ipp: 41.4V
• Package / Case: DO-214AA, SMB (surface mount)
• Unidirectional Channels: 1
• Type: Zener

Secondary Compatibility Factors:

• Current - Peak Pulse rating (minimum 14.4A required)
• Power - Peak Pulse rating (minimum 600W required)
• Operating Temperature range (must encompass application requirements)
• RoHS and REACH compliance status

Substitute parts are grouped into two categories based on electrical performance alignment:

Group 1 - Direct Electrical Equivalents (41.4V Clamping): Parts maintaining identical voltage specifications and clamping characteristics. These include 1KSMB30A, P6SMB30A (Eaton), TPSMB30A, and SMBJP6KE30A-TP. All maintain 25.6V standoff, 28.5V breakdown minimum, and 41.4V maximum clamping voltage.

Group 2 - Higher Performance Variants (54.6V Clamping): Parts with elevated clamping voltage specifications (SM6T30A and SM6T30AY). These provide enhanced transient suppression capability while maintaining identical standoff and breakdown voltages, suitable for applications requiring higher energy absorption.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

The P6SMB30A (Eaton) and SMBJP6KE30A-TP are primary candidates for direct substitution, maintaining all critical voltage parameters and 600W power rating. The P6SMB30A offers the highest inventory availability (24,987 pcs) and active product status. However, note that the Eaton variant is RoHS non-compliant, which may restrict use in regulated applications. The SMBJP6KE30A-TP provides ROHS3 compliance with adequate inventory (9,249 pcs) and extended operating temperature range (-55°C ~ 175°C).

The TPSMB30A (Littelfuse) maintains the original manufacturer lineage with ROHS3 compliance and AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade components. Operating temperature extends to 175°C, providing thermal margin over the original specification.

The 1KSMB30A (Taiwan Semiconductor Corporation) offers enhanced current handling (24.2A versus 14.4A) and elevated power rating (1kW versus 600W) while maintaining identical voltage specifications. This part provides performance headroom for applications with higher transient stress.

For Enhanced Performance Applications:

The SM6T30A and SM6T30AY (STMicroelectronics) feature elevated clamping voltage (54.6V) and significantly higher peak pulse current (75A at 8/20µs pulse), suitable for applications requiring superior energy absorption. The SM6T30AY includes AEC-Q101 automotive qualification. These variants are appropriate only when circuit design permits the higher clamping voltage.

Compliance Considerations:

For RoHS3-regulated applications, exclude P6SMB30A (Eaton). For automotive applications requiring AEC-Q101 qualification, select TPSMB30A or SM6T30AY. For general industrial applications without specific compliance mandates, all active substitutes are viable based on electrical requirements.

Frequently Asked Questions (FAQ)

Q: Can the P6SMB30AT3G be directly replaced with any of the listed substitutes?

A: Direct replacement is possible with parts maintaining identical voltage specifications: 25.6V reverse standoff, 28.5V breakdown minimum, and 41.4V maximum clamping voltage. These include P6SMB30A (Eaton), TPSMB30A, SMBJP6KE30A-TP, and 1KSMB30A. All are packaged in DO-214AA (SMB) format with surface-mount compatibility. Verify compliance requirements before selection.

Q: What is the difference between Group 1 and Group 2 substitutes?

A: Group 1 substitutes (P6SMB30A, TPSMB30A, SMBJP6KE30A-TP, 1KSMB30A) maintain the original 41.4V clamping voltage specification. Group 2 substitutes (SM6T30A, SM6T30AY) feature 54.6V clamping voltage, providing higher transient suppression but requiring circuit validation to confirm compatibility with the elevated clamping level.

Q: Are all substitutes RoHS compliant?

A: Five of seven substitutes are ROHS3 compliant: 1KSMB30A, TPSMB30A, SMBJP6KE30A-TP, SM6T30A, and SM6T30AY. The P6SMB30A (Eaton) is RoHS non-compliant and must be excluded from applications subject to RoHS regulations.

Q: Which substitute offers the best inventory availability?

A: The P6SMB30A (Eaton) provides the highest inventory level at 24,987 pcs. However, due to RoHS non-compliance, the SMBJP6KE30A-TP (9,249 pcs) or TPSMB30A (1,445 pcs) are recommended for regulated applications.

Q: Can I use SM6T30A or SM6T30AY as a drop-in replacement?

A: These parts are electrically compatible in terms of standoff and breakdown voltages but feature higher clamping voltage (54.6V versus 41.4V). Use only if circuit design permits the elevated clamping level. Peak pulse current is significantly higher (75A versus 14.4A), providing enhanced protection capability.

Q: What is the significance of AEC-Q101 qualification?

A: AEC-Q101 qualification indicates automotive-grade reliability testing and is required for automotive applications. TPSMB30A and SM6T30AY carry this qualification; other substitutes do not.

Q: Are there temperature range differences between substitutes?

A: Yes. The original P6SMB30AT3G operates -65°C ~ 150°C. Substitutes vary: 1KSMB30A, SMBJP6KE30A-TP, and TPSMB30A extend to 175°C; SM6T30A and SM6T30AY operate -55°C ~ 150°C; P6SMB30A operates -55°C ~ 150°C. Verify application temperature requirements before selection.

Q: Is package compatibility guaranteed across all substitutes?

A: All substitutes use DO-214AA (SMB) surface-mount packaging, ensuring mechanical and footprint compatibility. Verify PCB layout and reflow profile compatibility with your manufacturing process.