P6SMB15AT3G Equivalent & Substitute Parts

Part Overview

The P6SMB15AT3G is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface mount applications. This part operates with a 12.8V reverse standoff voltage and 21.2V maximum clamping voltage, delivering 28A peak pulse current in a compact SMB (DO-214AA) package. The P6SMB15AT3G is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	12.8V
Voltage - Breakdown (Min)	14.3V
Voltage - Clamping (Max) @ Ipp	21.2V
Current - Peak Pulse (10/1000µs)	28A
Power - Peak Pulse	600W
Package / Case	DO-214AA, SMB
Operating Temperature	-65°C ~ 150°C (TJ)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the P6SMB15AT3G is determined by the following critical electrical and mechanical parameters:

Voltage - Reverse Standoff: 12.8V (exact match required)
Voltage - Clamping (Max) @ Ipp: 21.2V (exact match required)
Current - Peak Pulse (10/1000µs): 28A minimum
Package / Case: DO-214AA or SMB (mechanical compatibility)
Mounting Type: Surface Mount
Operating Temperature Range: Must encompass application requirements

Substitute parts are grouped into two categories based on peak pulse current capability:

Category A (28A nominal): Parts with 28A to 28.8A peak pulse current, maintaining electrical equivalence with the original specification.

Category B (Enhanced capability): Parts with higher peak pulse current (47.2A or 147A), providing superior transient protection while maintaining voltage parameters and package compatibility.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package	Operating Temperature	Product Status
P6SMB15AT3G	Littelfuse Inc.	12.8V	21.2V	28A	600W	DO-214AA, SMB	-65°C ~ 150°C	Obsolete
1KSMB15A	Taiwan Semiconductor Corporation	12.8V	21.2V	47.2A	1000W	DO-214AA, SMB	-55°C ~ 175°C	Active
P6SMB15A	Eaton - Electronics Division	12.8V	21.2V	28.8A	600W	DO-214AA, SMB	-55°C ~ 150°C	Active
TPSMB15A	Littelfuse Inc.	12.8V	21.2V	28.8A	600W	DO-214AA, SMB	-65°C ~ 175°C	Active
SM6T15A-E3/52	Vishay General Semiconductor - Diodes Division	12.8V	21.2V	28A	600W	DO-214AA, SMB	-65°C ~ 150°C	Active
SM6T15A-M3/52	Vishay General Semiconductor - Diodes Division	12.8V	21.2V	28A	600W	DO-214AA, SMB	-65°C ~ 150°C	Active
SM6T15A-M3/5B	Vishay General Semiconductor - Diodes Division	12.8V	21.2V	28A	600W	DO-214AA, SMB	-65°C ~ 150°C	Active
SM6T15AY	STMicroelectronics	12.8V	27.2V	147A (8/20µs)	600W	DO-214AA, SMB	-55°C ~ 150°C	Active
SMBJP6KE15A-TP	Micro Commercial Co	12.8V	21.2V	28.8A	600W	DO-214AA, SMB	-55°C ~ 175°C	Active
SM6T15A	STMicroelectronics	12.8V	27.2V	147A (8/20µs)	600W	DO-214AA, SMB	-55°C ~ 150°C	Active

Engineering Selection Recommendations

Direct Equivalents (Recommended for Drop-In Replacement):

SM6T15A-E3/52, SM6T15A-M3/52, and SM6T15A-M3/5B from Vishay General Semiconductor maintain identical electrical specifications (12.8V standoff, 21.2V clamping, 28A peak pulse) and package configuration. These parts are ROHS3 compliant and active in production, providing immediate substitution capability.

Manufacturer-Recommended Alternatives:

P6SMB15A (Eaton - Electronics Division) and SMBJP6KE15A-TP (Micro Commercial Co) deliver 28.8A peak pulse current with 21.2V clamping voltage, exceeding the original 28A specification while maintaining electrical compatibility. Both are active products with extended operating temperature ranges (-55°C to 175°C for SMBJP6KE15A-TP).

Enhanced Protection Option:

TPSMB15A from Littelfuse Inc. provides the same manufacturer lineage as the original part, with identical 28.8A peak pulse current and extended temperature range (-65°C to 175°C). This part carries AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade reliability.

Higher Current Capability:

1KSMB15A (Taiwan Semiconductor Corporation) and SM6T15A/SM6T15AY (STMicroelectronics) offer significantly higher peak pulse current (47.2A and 147A respectively) while maintaining 12.8V standoff voltage. These parts provide enhanced transient suppression for demanding applications. SM6T15AY includes AEC-Q101 automotive qualification.

All substitute parts are ROHS3 compliant and REACH unaffected, meeting environmental regulatory requirements equivalent to the original P6SMB15AT3G.

Frequently Asked Questions (FAQ)

Q: Can I use SM6T15AY or SM6T15A as direct replacements for P6SMB15AT3G?

A: These parts maintain the 12.8V reverse standoff voltage and DO-214AA package compatibility. However, they specify 27.2V maximum clamping voltage compared to the original 21.2V specification. This higher clamping voltage may affect circuit protection thresholds. Electrical circuit validation is necessary before deployment.

Q: What is the difference between 28A and 28.8A peak pulse current ratings?

A: The 28.8A variants (P6SMB15A, TPSMB15A, SMBJP6KE15A-TP) provide marginally higher transient current handling capability. This difference is within typical manufacturing tolerance and does not require circuit redesign for applications originally specified at 28A.

Q: Are the Vishay SM6T15A variants (E3/52, M3/52, M3/5B) interchangeable?

A: Yes. These parts share identical electrical specifications (12.8V standoff, 21.2V clamping, 28A peak pulse) and DO-214AA package configuration. Differences in part number suffixes reflect packaging tape specifications and manufacturing date codes, not functional performance.

Q: Why does 1KSMB15A have 1000W peak pulse power instead of 600W?

A: The 1KSMB15A delivers 47.2A peak pulse current at 21.2V clamping voltage, resulting in higher power dissipation (1000W) compared to the original 28A specification (600W). This enhanced capability provides superior transient protection without affecting voltage regulation parameters.

Q: Can I use parts with extended temperature ranges (-55°C to 175°C) in place of the original (-65°C to 150°C)?

A: Extended upper temperature limits (175°C vs. 150°C) provide additional thermal margin. However, the reduced lower temperature limit (-55°C vs. -65°C) may be restrictive for applications requiring operation below -55°C. Verify application temperature requirements before substitution.

Q: What does AEC-Q101 qualification mean for automotive applications?

A: AEC-Q101 certification indicates the part meets automotive industry reliability and quality standards. TPSMB15A and SM6T15AY carry this qualification, making them suitable for automotive and mission-critical applications requiring enhanced reliability documentation.

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