P6SMB33CAT3G Equivalent & Substitute Parts

Part Overview

The P6SMB33CAT3G 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 reverse standoff voltage of 28.2V and provides clamping at 45.7V with a peak pulse current of 13.2A. The device is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain functional compatibility within the same electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	28.2	V
Voltage - Breakdown (Min)	31.4	V
Voltage - Clamping (Max) @ Ipp	45.7	V
Current - Peak Pulse (10/1000µs)	13.2	A
Power - Peak Pulse	600	W
Package / Case	DO-214AA, SMB	—
Operating Temperature Range	-65°C to 150°C	TJ
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

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

Voltage - Reverse Standoff (Typ): 28.2V
Voltage - Breakdown (Min): 31.4V
Voltage - Clamping (Max) @ Ipp: 45.7V
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Bidirectional Channels: 1
Type: Zener

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents: Parts with identical voltage ratings (28.2V standoff, 31.4V breakdown, 45.7V clamping) and compatible peak pulse current specifications. These parts maintain full functional interchangeability.

Category B - Functional Alternatives: Parts with the same standoff voltage (28.2V) and package format but with variations in clamping voltage or peak pulse current that remain within acceptable operating margins for general-purpose applications.

Parameter Comparison

Part Number	Manufacturer	Standoff Voltage (V)	Breakdown Voltage (V)	Clamping Voltage (V)	Peak Pulse Current (A)	Power - Peak Pulse (W)	Package	Product Status	Operating Temp (°C)
P6SMB33CAT3G	Littelfuse Inc.	28.2	31.4	45.7	13.2	600	DO-214AA, SMB	Obsolete	-65 to 150
1KSMB33CA	Taiwan Semiconductor Corporation	28.2	31.4	45.7	21.9	1000	DO-214AA, SMB	Active	-55 to 175
P6SMB33CA	Eaton - Electronics Division	28.2	31.4	45.7	13.3	600	DO-214AA, SMB	Active	-55 to 150
SMBJ30CA	MDD	30.0	33.3	48.4	12.4	600	DO-214AA, SMB	Active	-50 to 150
TPSMB33CA	Littelfuse Inc.	28.2	31.4	45.7	13.3	600	DO-214AA, SMB	Active	-65 to 175
P6SMB33CAHE3_A/H	Vishay General Semiconductor - Diodes Division	28.2	31.4	45.7	13.1	600	DO-214AA, SMB	Obsolete	-65 to 150
SM6T33CA	STMicroelectronics	28.2	31.4	59.0	68.0 (8/20µs)	600	DO-214AA, SMB	Active	-55 to 150
SM6T33CA-M3/5B	Vishay General Semiconductor - Diodes Division	28.2	31.4	45.7	13.1	600	DO-214AA, SMB	Active	-65 to 150
SM6T33CAY	STMicroelectronics	28.2	31.4	59.0	68.0 (8/20µs)	600	DO-214AA, SMB	Active	-55 to 150

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

1KSMB33CA, P6SMB33CA, TPSMB33CA, and SM6T33CA-M3/5B are direct electrical equivalents with matching voltage ratings (28.2V standoff, 31.4V breakdown, 45.7V clamping) and compatible current handling. These parts are all active products with current manufacturing support. TPSMB33CA is manufactured by Littelfuse Inc. (original manufacturer) and includes automotive-grade qualification (AEC-Q101) with extended operating temperature range (-65°C to 175°C), making it the preferred direct replacement. P6SMB33CA from Eaton and 1KSMB33CA from Taiwan Semiconductor Corporation provide equivalent performance with active product status.

Secondary Substitutes (Functional Alternatives):

SM6T33CA and SM6T33CAY from STMicroelectronics maintain the same standoff voltage (28.2V) and package format but feature higher clamping voltage (59V) and significantly higher peak pulse current (68A at 8/20µs pulse). These parts are suitable for applications requiring enhanced transient suppression capability. SMBJ30CA from MDD operates at a slightly elevated standoff voltage (30V) with correspondingly higher clamping voltage (48.4V), appropriate for circuits with higher voltage tolerance margins.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). TPSMB33CA and SM6T33CAY carry AEC-Q101 automotive qualification, suitable for automotive and industrial applications requiring enhanced reliability standards.

Frequently Asked Questions (FAQ)

Q: Can P6SMB33CA from Eaton be used as a direct replacement for P6SMB33CAT3G?

A: Yes. Both parts share identical voltage ratings (28.2V standoff, 31.4V breakdown, 45.7V clamping), peak pulse current specifications (13.2A vs. 13.3A), and DO-214AA/SMB package format. P6SMB33CA is an active product with current manufacturing support.

Q: What is the difference between TPSMB33CA and the original P6SMB33CAT3G?

A: TPSMB33CA is manufactured by Littelfuse Inc. (the original manufacturer) and provides identical electrical specifications. The primary differences are product status (active vs. obsolete) and extended operating temperature range (-65°C to 175°C vs. -65°C to 150°C). TPSMB33CA includes AEC-Q101 automotive qualification.

Q: Why do SM6T33CA and SM6T33CAY have higher clamping voltages (59V) than the original part (45.7V)?

A: SM6T33CA and SM6T33CAY are designed for applications requiring higher transient suppression thresholds. While they maintain the same 28.2V standoff voltage, the elevated clamping voltage (59V) and significantly higher peak pulse current (68A) make them suitable for circuits with higher voltage tolerance or more severe transient conditions. These parts are not direct equivalents but functional alternatives for specific application requirements.

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

A: Yes. All substitute parts listed are available in DO-214AA/SMB surface mount package format, ensuring mechanical and thermal compatibility with the original P6SMB33CAT3G footprint.

Q: Which substitute part offers the best long-term availability?

A: 1KSMB33CA, P6SMB33CA, SM6T33CA, SM6T33CA-M3/5B, and SM6T33CAY are all active products with current manufacturing support. TPSMB33CA from Littelfuse Inc. is recommended for long-term supply assurance as it is manufactured by the original component supplier.

Q: Can SMBJ30CA be used as a substitute?

A: SMBJ30CA operates at a higher standoff voltage (30V vs. 28.2V) and clamping voltage (48.4V vs. 45.7V). It is a functional alternative suitable for circuits with higher voltage tolerance margins but not a direct electrical equivalent. Use only if circuit design permits the elevated voltage specifications.

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