P6SMBJ33C Equivalent & Substitute Parts

Part Overview

The P6SMBJ33C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc. in the DO-214AA (SMB) surface mount package. This component is designed for general-purpose transient voltage suppression with a 28.2V reverse standoff voltage and 600W peak pulse power rating. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	P6SMBJ33C
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Package / Case	DO-214AA, SMB
Voltage - Reverse Standoff (Typ)	28.2V
Voltage - Breakdown (Min)	29.75V
Voltage - Clamping (Max) @ Ipp	47.99V
Current - Peak Pulse (10/1000µs)	13.3A
Power - Peak Pulse	600W
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the P6SMBJ33C is determined by the following critical electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): 28.2V
Voltage - Clamping (Max) @ Ipp: 45.7V to 47.99V range
Current - Peak Pulse (10/1000µs): 13.1A to 13.3A
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB (surface mount)
Bidirectional Channels: 1
Operating Temperature: -55°C minimum to 150°C maximum

Substitute parts are grouped into two categories based on clamping voltage characteristics:

Group 1 (Clamping Voltage 45.7V): P6SMB33CA, SZP6SMB33CAT3G, SMBJP6KE33CA-TP, P6SMB33CAHE3_A/H, SM6T33CA-E3/52

Group 2 (Clamping Voltage 59V): SM6T33CA, SM6T33CAY

All substitute parts maintain the 28.2V reverse standoff voltage, 600W power rating, and DO-214AA/SMB package compatibility required for direct functional replacement.

Parameter Comparison

Parameter	P6SMBJ33C	P6SMB33CA	SZP6SMB33CAT3G	SMBJP6KE33CA-TP	P6SMB33CAHE3_A/H	SM6T33CA-E3/52	SM6T33CA	SM6T33CAY
Manufacturer	Littelfuse	Eaton	Littelfuse	Micro Commercial Co	Vishay	Vishay	STMicroelectronics	STMicroelectronics
Product Status	Obsolete	Active	Active	Active	Obsolete	Active	Active	Active
Voltage - Reverse Standoff (Typ)	28.2V	28.2V	28.2V	28.2V	28.2V	28.2V	28.2V	28.2V
Voltage - Breakdown (Min)	29.75V	31.4V	31.4V	31.4V	31.4V	31.4V	31.4V	31.4V
Voltage - Clamping (Max) @ Ipp	47.99V	45.7V	45.7V	45.7V	45.7V	45.7V	59V	59V
Current - Peak Pulse (10/1000µs)	13.3A	13.3A	13.2A	13.3A	13.1A	13.1A	68A (8/20µs)	68A (8/20µs)
Power - Peak Pulse	600W	600W	600W	600W	600W	600W	600W	600W
Operating Temperature Range	-55°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 175°C	-65°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
RoHS Status	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
AEC-Q101 Automotive Qualification	Not specified	Not specified	Yes	Not specified	Yes	Not specified	Not specified	Yes

Engineering Selection Recommendations

Primary Substitutes (Group 1 - Clamping Voltage 45.7V):

P6SMB33CA (Eaton) and SZP6SMB33CAT3G (Littelfuse) are the preferred active substitutes. Both maintain electrical parameters within the original specification envelope with 45.7V clamping voltage. SZP6SMB33CAT3G offers extended temperature range (-65°C to 150°C) and AEC-Q101 automotive qualification, making it suitable for automotive and extended-temperature applications. P6SMB33CA is available in higher inventory quantities and supports telecom applications.

SMBJP6KE33CA-TP (Micro Commercial Co) provides an active alternative with extended operating temperature to 175°C and maintains full electrical compatibility.

Secondary Substitutes (Group 1 - Clamping Voltage 45.7V):

P6SMB33CAHE3_A/H (Vishay) and SM6T33CA-E3/52 (Vishay) are obsolete or limited-availability options. P6SMB33CAHE3_A/H carries AEC-Q101 qualification for automotive applications but is obsolete. SM6T33CA-E3/52 is active and suitable for general-purpose applications.

Alternative Substitutes (Group 2 - Clamping Voltage 59V):

SM6T33CA and SM6T33CAY (STMicroelectronics) feature higher clamping voltage (59V) and significantly higher peak pulse current (68A at 8/20µs). These parts are suitable only when higher clamping voltage and current handling are acceptable for the application. SM6T33CAY includes AEC-Q101 automotive qualification.

Compliance Considerations:

All substitute parts are RoHS compliant. Parts with AEC-Q101 qualification (SZP6SMB33CAT3G, P6SMB33CAHE3_A/H, SM6T33CAY) are suitable for automotive applications requiring formal qualification documentation.

Frequently Asked Questions (FAQ)

Q: Can I use SM6T33CA or SM6T33CAY as direct replacements for P6SMBJ33C?

A: These parts are electrically compatible in terms of reverse standoff voltage (28.2V) and power rating (600W), but they feature higher clamping voltage (59V vs. 47.99V) and significantly higher peak pulse current (68A vs. 13.3A). Use only if your circuit design accommodates the higher clamping voltage specification.

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

A: Group 1 substitutes (P6SMB33CA, SZP6SMB33CAT3G, SMBJP6KE33CA-TP, P6SMB33CAHE3_A/H, SM6T33CA-E3/52) maintain clamping voltage at 45.7V, closely matching the original 47.99V specification. Group 2 substitutes (SM6T33CA, SM6T33CAY) have 59V clamping voltage and are suitable only for applications where higher clamping voltage is acceptable.

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

A: Yes. All substitute parts use the DO-214AA (SMB) surface mount package, ensuring mechanical and footprint compatibility with the original P6SMBJ33C.

Q: Which substitute offers the best availability?

A: SZP6SMB33CAT3G (Littelfuse) offers the highest inventory (150,200 pcs) and is the recommended primary substitute for new designs. P6SMB33CA (Eaton) provides the second-highest availability (44,300 pcs).

Q: Do I need to consider temperature range differences?

A: The original P6SMBJ33C operates from -55°C to 150°C. Most substitutes maintain this range. SZP6SMB33CAT3G, P6SMB33CAHE3_A/H, and SM6T33CA-E3/52 extend the lower limit to -65°C, providing additional margin for cold-temperature applications. SMBJP6KE33CA-TP extends the upper limit to 175°C for high-temperature environments.

Q: Are automotive-qualified alternatives available?

A: Yes. SZP6SMB33CAT3G, P6SMB33CAHE3_A/H, and SM6T33CAY carry AEC-Q101 automotive qualification. These parts are suitable for automotive applications requiring formal qualification documentation.

Q: What is the significance of RoHS compliance?

A: All substitute parts are RoHS compliant, meeting environmental and regulatory requirements for lead-free manufacturing. The original P6SMBJ33C is ROHS3 compliant, and all substitutes maintain this or equivalent compliance level.

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