SZP6SMB33CAT3G Equivalent & Substitute Parts

Part Overview

The SZP6SMB33CAT3G is a transient voltage suppressor (TVS) diode manufactured by Littelfuse, designed for surface mount applications in the DO-214AA (SMB) package. This bidirectional Zener diode provides transient voltage protection with a reverse standoff voltage of 28.2V and clamping voltage of 45.7V at peak pulse current. The part is actively produced and carries AEC-Q101 automotive qualification with ROHS3 compliance.

Equivalent and substitute parts are identified when they maintain identical or functionally compatible electrical parameters within the specified operating range, matching the core voltage and current ratings while accommodating package and manufacturer variations.

Key Parameters

Parameter	Value
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
Package / Case	DO-214AA, SMB
Operating Temperature Range	-65°C ~ 150°C (TJ)
Type	Zener
Bidirectional Channels	1
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SZP6SMB33CAT3G is determined by the following critical parameters:

Voltage - Reverse Standoff: 28.2V (exact match required)
Voltage - Breakdown (Min): 31.4V (exact match required)
Voltage - Clamping (Max) @ Ipp: 45.7V (exact match required)
Current - Peak Pulse: 13.2A minimum (equal or higher acceptable)
Power - Peak Pulse: 600W minimum (equal or higher acceptable)
Package / Case: DO-214AA or SMB (physically compatible)
Type: Zener, Bidirectional, single channel (exact match required)
Mounting Type: Surface Mount (exact match required)

Parts meeting these criteria are classified as direct equivalents. Parts with higher peak pulse current or power ratings are acceptable upgrades. All substitute parts listed maintain ROHS3 compliance and MSL 1 rating.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package	Product Status
SZP6SMB33CAT3G	Littelfuse	28.2V	31.4V	45.7V	13.2A	600W	-65°C ~ 150°C	DO-214AA, SMB	Active
1KSMB33CA	Taiwan Semiconductor Corporation	28.2V	31.4V	45.7V	21.9A	1000W	-55°C ~ 175°C	DO-214AA, SMB	Active
P6SMB33CA	Eaton - Electronics Division	28.2V	31.4V	45.7V	13.3A	600W	-55°C ~ 150°C	DO-214AA, SMB	Active
TPSMB33CA	Littelfuse Inc.	28.2V	31.4V	45.7V	13.3A	600W	-65°C ~ 175°C	DO-214AA, SMB	Active
SMBJP6KE33CA-TP	Micro Commercial Co	28.2V	31.4V	45.7V	13.3A	600W	-55°C ~ 175°C	DO-214AA, SMB	Active
P6SMB33CA-AU_R1_000A1	Panjit International Inc.	28.2V	31.4V	45.7V	13.2A	600W	-55°C ~ 150°C	DO-214AA, SMB	Active
P6SMB33CA-E3/52	Vishay General Semiconductor - Diodes Division	28.2V	31.4V	45.7V	13.1A	600W	-65°C ~ 150°C	DO-214AA, SMB	Active
P6SMB33CA-E3/5B	Vishay General Semiconductor - Diodes Division	28.2V	31.4V	45.7V	13.1A	600W	-65°C ~ 150°C	DO-214AA, SMB	Active
P6SMB33CAHE3_A/H	Vishay General Semiconductor - Diodes Division	28.2V	31.4V	45.7V	13.1A	600W	-65°C ~ 150°C	DO-214AA, SMB	Obsolete
SM6T33CA	STMicroelectronics	28.2V	31.4V	59V	68A (8/20µs)	600W	-55°C ~ 150°C	DO-214AA, SMB	Active

Engineering Selection Recommendations

All listed substitute parts maintain the core voltage specifications (28.2V reverse standoff, 31.4V breakdown minimum, 45.7V clamping) required for functional equivalence with the SZP6SMB33CAT3G.

Direct Equivalents (Active Status): P6SMB33CA, TPSMB33CA, SMBJP6KE33CA-TP, P6SMB33CA-AU_R1_000A1, P6SMB33CA-E3/52, and P6SMB33CA-E3/5B are functionally equivalent with peak pulse currents between 13.1A and 13.3A and identical 600W power ratings. These parts are suitable for direct substitution in applications requiring the specified voltage protection characteristics.

Upgrade Option: 1KSMB33CA provides enhanced performance with 21.9A peak pulse current and 1000W power rating while maintaining identical voltage specifications. This part is suitable for applications requiring higher transient energy absorption capacity.

Extended Temperature Range: TPSMB33CA and SMBJP6KE33CA-TP offer operating temperature ranges extending to 175°C, compared to the SZP6SMB33CAT3G maximum of 150°C. These parts are suitable for high-temperature applications.

Automotive Qualification: SZP6SMB33CAT3G and TPSMB33CA carry AEC-Q101 automotive qualification. P6SMB33CA-AU_R1_000A1 and P6SMB33CAHE3_A/H also carry AEC-Q101 qualification for automotive applications.

Obsolete Status: P6SMB33CAHE3_A/H is marked obsolete and should not be selected for new designs despite functional equivalence.

Higher Clamping Voltage: SM6T33CA exhibits a clamping voltage of 59V with significantly higher peak pulse current (68A at 8/20µs waveform). This part is not a direct equivalent due to the elevated clamping voltage and is suitable only for applications where higher voltage suppression is acceptable.

Frequently Asked Questions (FAQ)

Q: Can I substitute the SZP6SMB33CAT3G with any of the listed parts?

A: Direct substitution is possible with P6SMB33CA, TPSMB33CA, SMBJP6KE33CA-TP, P6SMB33CA-AU_R1_000A1, P6SMB33CA-E3/52, and P6SMB33CA-E3/5B. All maintain identical voltage specifications and 600W power rating. Avoid P6SMB33CAHE3_A/H (obsolete status) and SM6T33CA (higher clamping voltage).

Q: What is the difference between the SZP6SMB33CAT3G and 1KSMB33CA?

A: Both parts maintain identical voltage specifications (28.2V standoff, 31.4V breakdown, 45.7V clamping). The 1KSMB33CA provides higher peak pulse current (21.9A versus 13.2A) and power rating (1000W versus 600W), making it suitable for applications requiring greater transient energy absorption.

Q: Are all substitute parts RoHS compliant?

A: All listed substitute parts carry ROHS3 compliance status, matching the SZP6SMB33CAT3G compliance level.

Q: Can I use SM6T33CA as a substitute?

A: SM6T33CA is not a direct equivalent. While it maintains the 28.2V reverse standoff and 31.4V breakdown specifications, its clamping voltage is 59V compared to 45.7V for the SZP6SMB33CAT3G. Use only if your application tolerates higher clamping voltage.

Q: Which substitute part is best for automotive applications?

A: For automotive applications requiring AEC-Q101 qualification, select TPSMB33CA, P6SMB33CA-AU_R1_000A1, or the original SZP6SMB33CAT3G. TPSMB33CA offers the extended temperature range (-65°C ~ 175°C) while maintaining automotive qualification.

Q: What is the packaging difference between these parts?

A: All substitute parts use the DO-214AA (SMB) surface mount package, ensuring mechanical and electrical compatibility with the SZP6SMB33CAT3G. Packaging variations (Tape & Reel versus Cut Tape) affect supply chain logistics but not circuit performance.

Q: Can I use parts with higher peak pulse current ratings?

A: Yes. Parts with equal or higher peak pulse current ratings (such as 1KSMB33CA at 21.9A) are acceptable upgrades and provide enhanced transient protection capability without compromising circuit compatibility.

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