P6SMB33AT3 Equivalent & Substitute Parts

Part Overview

The P6SMB33AT3 is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for surface mount applications in the DO-214AA (SMB) package. This unidirectional Zener diode provides 28.2V reverse standoff voltage with 45.7V maximum clamping voltage and 13.2A peak pulse current capability. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	P6SMB33AT3
Manufacturer	onsemi
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Package / Case	DO-214AA, SMB
Voltage - Reverse Standoff (Typ)	28.2V
Voltage - Breakdown (Min)	31.4V
Voltage - Clamping (Max) @ Ipp	45.7V
Current - Peak Pulse (10/1000µs)	13.2A
Power - Peak Pulse	600W
Operating Temperature	-65°C ~ 150°C (TJ)
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Qualification	AEC-Q101

Substitute Part Grouping Explanation

Substitution of the P6SMB33AT3 is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Voltage - Reverse Standoff (Typ): 28.2V
Voltage - Breakdown (Min): 31.4V
Voltage - Clamping (Max) @ Ipp: 45.7V
Current - Peak Pulse (10/1000µs): minimum 13.2A
Power - Peak Pulse: minimum 600W

Mechanical Compatibility Criteria:

Package / Case: DO-214AA or SMB equivalent
Mounting Type: Surface Mount
Unidirectional Channels: 1

Substitute parts are grouped into two categories based on these parameters:

Category A - Direct Electrical & Mechanical Equivalents (45.7V Clamping): Parts meeting all electrical specifications with 45.7V clamping voltage and compatible SMB/DO-214AA packaging. These include 1KSMB33A, P6SMB33A (Eaton), P6SMB33A-M3/52, P6SMB33A-M3/5B, and SM6T33A-M3/52, SM6T33A-M3/5B.

Category B - Electrical Equivalents with Higher Clamping Voltage (59V Clamping): Parts meeting standoff and breakdown voltage specifications but with higher clamping voltage (59V). These include SM6T33A and SM6T33AY from STMicroelectronics, suitable where higher transient suppression is acceptable.

Category C - Package Variant (SOD-128): PTVS28VP1UP,115 from Nexperia meets electrical specifications but uses SOD-128 package instead of SMB, requiring PCB layout modification.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Operating Temperature	RoHS Status
P6SMB33AT3	onsemi	Obsolete	28.2V	31.4V	45.7V	13.2A	600W	DO-214AA, SMB	-65°C ~ 150°C	RoHS non-compliant
1KSMB33A	Taiwan Semiconductor Corporation	Active	28.2V	31.4V	45.7V	21.9A	1000W	DO-214AA, SMB	-55°C ~ 175°C	ROHS3 Compliant
P6SMB33A	Eaton - Electronics Division	Active	28.2V	31.4V	45.7V	13.3A	600W	DO-214AA, SMB	-55°C ~ 150°C	RoHS Compliant
P6SMB33A-M3/52	Vishay General Semiconductor - Diodes Division	Active	28.2V	31.4V	45.7V	13.1A	600W	DO-214AA, SMB	-65°C ~ 150°C	ROHS3 Compliant
P6SMB33A-M3/5B	Vishay General Semiconductor - Diodes Division	Active	28.2V	31.4V	45.7V	13.1A	600W	DO-214AA, SMB	-65°C ~ 150°C	ROHS3 Compliant
PTVS28VP1UP,115	Nexperia USA Inc.	Active	28V	31.1V	45.4V	13.2A	600W	SOD-128	-55°C ~ 150°C	ROHS3 Compliant
SM6T33A	STMicroelectronics	Active	28.2V	31.4V	59V	68A (8/20µs)	600W	DO-214AA, SMB	-55°C ~ 150°C	ROHS3 Compliant
SM6T33A-M3/52	Vishay General Semiconductor - Diodes Division	Active	28.2V	31.4V	45.7V	13.1A	600W	DO-214AA, SMB	-65°C ~ 150°C	ROHS3 Compliant
SM6T33A-M3/5B	Vishay General Semiconductor - Diodes Division	Active	28.2V	31.4V	45.7V	13.1A	600W	DO-214AA, SMB	-65°C ~ 150°C	ROHS3 Compliant
SM6T33AY	STMicroelectronics	Active	28.2V	31.4V	59V	68A (8/20µs)	600W	DO-214AA, SMB	-55°C ~ 150°C	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

P6SMB33A-M3/52 and P6SMB33A-M3/5B from Vishay General Semiconductor are the preferred direct replacements. Both maintain the original 45.7V clamping voltage, 13.1A peak pulse current, and 600W power rating. These parts are active products with ROHS3 compliance and AEC-Q101 qualification equivalent performance. Operating temperature range extends to -65°C, matching the original specification.

P6SMB33A from Eaton - Electronics Division provides equivalent electrical performance with 13.3A peak pulse current and is actively manufactured. This part is suitable for applications where the slightly higher current rating is acceptable.

For Enhanced Performance:

1KSMB33A from Taiwan Semiconductor Corporation offers superior specifications with 21.9A peak pulse current and 1000W power rating while maintaining 45.7V clamping voltage. This part is ROHS3 compliant and operates across -55°C to 175°C, providing extended temperature range. Use this part where higher transient energy absorption is required.

For Higher Transient Suppression:

SM6T33A and SM6T33AY from STMicroelectronics provide 59V clamping voltage with 68A peak pulse current (8/20µs pulse). These parts are suitable for applications requiring greater transient voltage suppression margin. SM6T33AY includes AEC-Q101 automotive qualification. Both are ROHS3 compliant.

For Package Variant Applications:

PTVS28VP1UP,115 from Nexperia meets electrical specifications in SOD-128 package. This part is suitable only where PCB layout accommodates SOD-128 footprint. It is ROHS3 compliant and AEC-Q101 qualified.

Compliance Considerations:

All recommended active substitutes are ROHS3 compliant, addressing the RoHS non-compliance status of the obsolete P6SMB33AT3. Parts from Vishay (P6SMB33A-M3/52, P6SMB33A-M3/5B, SM6T33A-M3/52, SM6T33A-M3/5B) and STMicroelectronics (SM6T33AY) carry AEC-Q101 automotive qualification, matching the original part's automotive grade designation.

Frequently Asked Questions (FAQ)

Q: Can I use SM6T33A or SM6T33AY as a direct replacement for P6SMB33AT3?

A: SM6T33A and SM6T33AY are electrically compatible in terms of reverse standoff voltage (28.2V) and breakdown voltage (31.4V). However, they feature 59V clamping voltage compared to the original 45.7V. This higher clamping voltage provides greater transient suppression margin and is suitable for applications where additional protection is beneficial. Verify circuit requirements before substitution.

Q: What is the difference between P6SMB33A-M3/52 and P6SMB33A-M3/5B?

A: Both parts are manufactured by Vishay General Semiconductor with identical electrical specifications: 28.2V reverse standoff, 31.4V breakdown, 45.7V clamping, and 13.1A peak pulse current. The difference lies in packaging designation (M3/52 versus M3/5B), which reflects different tape and reel configurations. Electrical performance and PCB compatibility are equivalent.

Q: Is 1KSMB33A a suitable replacement if my circuit requires higher current handling?

A: Yes. The 1KSMB33A from Taiwan Semiconductor Corporation maintains the same 45.7V clamping voltage and 28.2V reverse standoff voltage as the original P6SMB33AT3 but provides 21.9A peak pulse current and 1000W power rating compared to 13.2A and 600W. This part is suitable for applications requiring enhanced transient energy absorption while maintaining the same voltage protection level.

Q: Why is PTVS28VP1UP,115 listed as a substitute if it uses a different package?

A: PTVS28VP1UP,115 meets the electrical specifications (28V reverse standoff, 31.1V breakdown, 45.4V clamping, 13.2A peak pulse) and is ROHS3 compliant with AEC-Q101 qualification. However, it uses SOD-128 package instead of DO-214AA (SMB). This part is listed as a substitute only for applications where PCB layout can accommodate SOD-128 footprint. Package change requires PCB redesign.

Q: Are all substitute parts RoHS compliant?

A: All active substitute parts listed are ROHS3 compliant. The original P6SMB33AT3 is RoHS non-compliant. Substitution with any active part addresses RoHS compliance requirements for new designs and procurement.

Q: What is the temperature range difference between P6SMB33AT3 and its substitutes?

A: The original P6SMB33AT3 operates from -65°C to 150°C. Most active substitutes operate from -55°C to 150°C, with the exception of 1KSMB33A which extends to -55°C to 175°C. For applications requiring -65°C operation, select P6SMB33A-M3/52, P6SMB33A-M3/5B, or SM6T33A-M3/52, SM6T33A-M3/5B from Vishay.

Q: Can I substitute based on package compatibility alone?

A: No. Package compatibility (DO-214AA/SMB) is necessary but not sufficient for substitution. Electrical parameters must also match: reverse standoff voltage (28.2V), breakdown voltage (31.4V), and clamping voltage (45.7V for direct replacement, or higher for enhanced protection). Peak pulse current must meet or exceed 13.2A. Verify all parameters before component selection.

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