P6SMB36AT3G Equivalent & Substitute Parts

Part Overview

The P6SMB36AT3G is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection applications. This part operates with a reverse standoff voltage of 30.8V and a clamping voltage of 49.9V at peak pulse current. The P6SMB36AT3G is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	P6SMB36AT3G
Manufacturer	Littelfuse
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	30.8V
Voltage - Breakdown (Min)	34.2V
Voltage - Clamping (Max) @ Ipp	49.9V
Current - Peak Pulse (10/1000µs)	12A
Power - Peak Pulse	600W
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature	-65°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the P6SMB36AT3G is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Voltage - Reverse Standoff (Typ): 30.8V
Voltage - Breakdown (Min): 34.2V
Voltage - Clamping (Max) @ Ipp: 49.9V
Current - Peak Pulse (10/1000µs): 12A or greater
Power - Peak Pulse: 600W or greater
Unidirectional configuration (1 channel)

Mechanical Compatibility Criteria:

Package / Case: DO-214AA or SMB equivalent
Mounting Type: Surface Mount
Operating Temperature Range: Must encompass or exceed -65°C to 150°C

Substitute parts are grouped into two categories:

Category A - Direct Electrical & Mechanical Equivalents: Parts with identical voltage ratings (30.8V standoff, 34.2V breakdown, 49.9V clamping) and equal or superior current handling (≥12A peak pulse). These parts are pin-compatible and functionally interchangeable.

Category B - Voltage-Variant Substitutes: Parts with different voltage ratings that do not meet the strict electrical criteria for direct substitution. These are listed for reference only and require circuit re-evaluation.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Operating Temperature	Product Status	RoHS Status
P6SMB36AT3G	Littelfuse	30.8V	34.2V	49.9V	12A	600W	DO-214AA, SMB	-65°C ~ 150°C	Obsolete	ROHS3 Compliant
1KSMB36A	Taiwan Semiconductor Corporation	30.8V	34.2V	49.9V	20A	1000W	DO-214AA, SMB	-55°C ~ 175°C	Active	ROHS3 Compliant
P6SMB36A	Eaton - Electronics Division	30.8V	34.2V	49.9V	12.2A	600W	DO-214AA, SMB	-55°C ~ 150°C	Active	RoHS Compliant
TPSMB36A	Littelfuse	30.8V	34.2V	49.9V	12.2A	600W	DO-214AA, SMB	-65°C ~ 175°C	Active	ROHS3 Compliant
SM6T36A-M3/52	Vishay General Semiconductor - Diodes Division	30.8V	34.2V	49.9V	12A	600W	DO-214AA, SMB	-65°C ~ 150°C	Active	ROHS3 Compliant
SM6T36A-M3/5B	Vishay General Semiconductor - Diodes Division	30.8V	34.2V	49.9V	12A	600W	DO-214AA, SMB	-65°C ~ 150°C	Active	ROHS3 Compliant
SM6T36A	STMicroelectronics	30.8V	34.2V	64.3V	62A (8/20µs)	600W	DO-214AA, SMB	-55°C ~ 150°C	Active	ROHS3 Compliant
SM6T36AY	STMicroelectronics	30.8V	34.2V	64.3V	62A (8/20µs)	600W	DO-214AA, SMB	-55°C ~ 150°C	Active	ROHS3 Compliant
SMBJ28A	MDD	28V	31.1V	45.4V	13.3A	600W	DO-214AA, SMB	-50°C ~ 150°C	Active	ROHS3 Compliant
P6SMB350CA	Eaton - Electronics Division	300V	332V	482V	1.3A	600W	DO-214AA, SMB	-55°C ~ 150°C	Active	RoHS non-compliant

Engineering Selection Recommendations

Primary Substitutes (Direct Electrical Equivalents):

The following parts maintain identical voltage specifications (30.8V standoff, 34.2V breakdown, 49.9V clamping) and are suitable for direct replacement in the P6SMB36AT3G application:

1KSMB36A, P6SMB36A, TPSMB36A, SM6T36A-M3/52, and SM6T36A-M3/5B are all active products with ROHS3 compliance. These parts are electrically and mechanically compatible with the obsolete P6SMB36AT3G.

Secondary Substitutes (Enhanced Performance):

SM6T36A and SM6T36AY offer superior current handling (62A peak pulse versus 12A) and higher clamping voltage (64.3V versus 49.9V). These parts are suitable for applications requiring enhanced transient suppression capability while maintaining the same reverse standoff voltage. SM6T36AY includes automotive-grade qualification (AEC-Q101).

Non-Equivalent Parts:

SMBJ28A and P6SMB350CA do not meet the electrical criteria for substitution. SMBJ28A operates at 28V standoff with 45.4V clamping, representing a lower voltage class. P6SMB350CA is a high-voltage part (300V standoff, 482V clamping) designed for telecom applications and is not electrically compatible. P6SMB350CA is also RoHS non-compliant.

Frequently Asked Questions (FAQ)

Q: Can I use 1KSMB36A as a direct replacement for P6SMB36AT3G?

A: Yes. The 1KSMB36A maintains identical voltage ratings (30.8V standoff, 34.2V breakdown, 49.9V clamping) and exceeds the current specification (20A versus 12A). It is pin-compatible in the DO-214AA SMB package and ROHS3 compliant. The extended operating temperature range (-55°C to 175°C) provides additional margin.

Q: What is the difference between P6SMB36A and TPSMB36A?

A: Both parts share identical voltage specifications and current ratings (12.2A). P6SMB36A is manufactured by Eaton with an operating range of -55°C to 150°C. TPSMB36A is manufactured by Littelfuse with an extended operating range of -65°C to 175°C and includes automotive-grade qualification (AEC-Q101). Selection depends on temperature requirements and supply chain preference.

Q: Why do SM6T36A and SM6T36AY have higher clamping voltages (64.3V) than the original part (49.9V)?

A: SM6T36A and SM6T36AY are manufactured by STMicroelectronics using different internal design specifications. While they maintain the same 30.8V reverse standoff voltage, the higher clamping voltage reflects different transient suppression characteristics. These parts are suitable only for applications where the higher clamping voltage is acceptable. SM6T36AY includes automotive qualification.

Q: Is SMBJ28A a suitable substitute?

A: No. SMBJ28A operates at 28V reverse standoff with 45.4V clamping voltage, representing a different voltage class. It is not electrically equivalent to the P6SMB36AT3G and requires circuit re-evaluation.

Q: What does RoHS compliance mean for TVS diode selection?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances regulations, restricting lead and other hazardous materials. All recommended primary substitutes are ROHS3 compliant. P6SMB350CA is RoHS non-compliant and should not be used in applications requiring RoHS certification.

Q: Can I use these substitutes in automotive applications?

A: TPSMB36A and SM6T36AY carry automotive-grade qualification (AEC-Q101), making them suitable for automotive applications. Other substitutes are general-purpose parts without automotive qualification. Verify application requirements before selection.

Q: Are all substitute parts available in the same SMB package?

A: Yes. All listed substitute parts use the DO-214AA (SMB) surface-mount package, ensuring mechanical compatibility and identical PCB footprints.

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