TPSMB33CA Equivalent & Substitute Parts

Part Overview

The TPSMB33CA is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., 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 peak pulse current handling of 13.3A at 10/1000µs pulse width. The component is actively produced and carries automotive-grade qualification (AEC-Q101), making it suitable for demanding industrial and automotive applications. Equivalent and substitute parts are identified based on matching electrical characteristics, package compatibility, and operational specifications.

Key Parameters

Parameter	Value
Manufacturer Part Number	TPSMB33CA
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Voltage - Reverse Standoff (Typ)	28.2V
Voltage - Breakdown (Min)	31.4V
Voltage - Clamping (Max) @ Ipp	45.7V
Current - Peak Pulse (10/1000µs)	13.3A
Power - Peak Pulse	600W
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature	-65°C ~ 175°C (TJ)
Grade	Automotive
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the TPSMB33CA are classified based on electrical parameter compatibility within the following criteria:

Primary Substitution Criteria:

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

Grouping Logic:

Group 1: Direct Electrical Equivalents (45.7V Clamping) Parts with identical clamping voltage (45.7V @ Ipp) and peak pulse current of 13.1A to 13.3A at 10/1000µs pulse width. These parts are fully interchangeable from an electrical standpoint.

Group 2: Higher Clamping Voltage Variants (59V Clamping) Parts with elevated clamping voltage (59V @ Ipp) and significantly higher peak pulse current (68A at 8/20µs). These parts provide enhanced transient suppression but operate at different electrical parameters and are suitable only when higher clamping voltage is acceptable.

Group 3: Obsolete Status Parts Parts with matching electrical specifications but marked as obsolete product status. These are not recommended for new designs.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse	Power - Peak Pulse	Package	Operating Temperature	Product Status	Grade	Qualification
TPSMB33CA	Littelfuse Inc.	28.2V	31.4V	45.7V	13.3A (10/1000µs)	600W	DO-214AA, SMB	-65°C ~ 175°C	Active	Automotive	AEC-Q101
P6SMB33CA	Eaton - Electronics Division	28.2V	31.4V	45.7V	13.3A (10/1000µs)	600W	DO-214AA, SMB	-55°C ~ 150°C	Active	—	—
SZP6SMB33CAT3G	Littelfuse	28.2V	31.4V	45.7V	13.2A (10/1000µs)	600W	DO-214AA, SMB	-65°C ~ 150°C	Active	Automotive	AEC-Q101
SMBJP6KE33CA-TP	Micro Commercial Co	28.2V	31.4V	45.7V	13.3A (10/1000µs)	600W	DO-214AA, SMB	-55°C ~ 175°C	Active	—	—
P6SMB33CA-E3/52	Vishay General Semiconductor - Diodes Division	28.2V	31.4V	45.7V	13.1A (10/1000µs)	600W	DO-214AA, SMB	-65°C ~ 150°C	Active	—	—
P6SMB33CA-E3/5B	Vishay General Semiconductor - Diodes Division	28.2V	31.4V	45.7V	13.1A (10/1000µs)	600W	DO-214AA, SMB	-65°C ~ 150°C	Active	—	—
P6SMB33CAHE3_A/H	Vishay General Semiconductor - Diodes Division	28.2V	31.4V	45.7V	13.1A (10/1000µs)	600W	DO-214AA, SMB	-65°C ~ 150°C	Obsolete	Automotive	AEC-Q101
SM6T33CA	STMicroelectronics	28.2V	31.4V	59V	68A (8/20µs)	600W	DO-214AA, SMB	-55°C ~ 150°C	Active	—	—
SM6T33CAY	STMicroelectronics	28.2V	31.4V	59V	68A (8/20µs)	600W	DO-214AA, SMB	-55°C ~ 150°C	Active	Automotive	AEC-Q101
SM6T33CA-E3/52	Vishay General Semiconductor - Diodes Division	28.2V	31.4V	45.7V	13.1A (10/1000µs)	600W	DO-214AA, SMB	-65°C ~ 150°C	Active	—	—

Engineering Selection Recommendations

For Automotive Applications with AEC-Q101 Requirement:

Use SZP6SMB33CAT3G (Littelfuse) as the primary substitute. This part maintains automotive-grade qualification and AEC-Q101 certification identical to the TPSMB33CA, with peak pulse current of 13.2A and operating temperature range of -65°C to 150°C. The upper temperature limit is reduced by 25°C compared to the original part.

For General Industrial Applications:

P6SMB33CA (Eaton) and P6SMB33CA-E3/52 (Vishay) are suitable alternatives with matching electrical specifications (45.7V clamping, 13.1–13.3A peak pulse current). Both are active products. Operating temperature range is -55°C to 150°C, which is narrower than the TPSMB33CA.

For Applications Requiring Extended Temperature Range:

SMBJP6KE33CA-TP (Micro Commercial Co) supports the full operating temperature range of -55°C to 175°C, matching the upper temperature limit of the original part.

Not Recommended for New Designs:

P6SMB33CAHE3_A/H (Vishay) is marked as obsolete and should not be used in new designs despite matching electrical specifications.

For Higher Transient Suppression Capability:

SM6T33CA (STMicroelectronics) and SM6T33CAY (STMicroelectronics) provide elevated clamping voltage (59V) and significantly higher peak pulse current (68A at 8/20µs pulse width). These parts are suitable only when the application circuit design accommodates the higher clamping voltage. SM6T33CAY carries automotive-grade qualification and AEC-Q101 certification.

Frequently Asked Questions (FAQ)

Q: Can I use P6SMB33CA as a direct replacement for TPSMB33CA?

A: P6SMB33CA is electrically compatible with matching reverse standoff voltage (28.2V), breakdown voltage (31.4V), clamping voltage (45.7V), and peak pulse current (13.3A). However, the operating temperature range is reduced from -65°C to 175°C to -55°C to 150°C. Verify that your application does not require the extended lower temperature capability of the original part.

Q: What is the difference between the 45.7V clamping variants and the 59V clamping variants?

A: Parts with 59V clamping voltage (SM6T33CA, SM6T33CAY) suppress transients to a higher voltage level compared to 45.7V variants. The 59V variants also handle significantly higher peak pulse current (68A at 8/20µs versus 13.3A at 10/1000µs). These parts are not interchangeable unless the circuit design is modified to accommodate the higher clamping voltage.

Q: Is SZP6SMB33CAT3G suitable for automotive applications?

A: Yes. SZP6SMB33CAT3G carries automotive-grade qualification and AEC-Q101 certification, matching the TPSMB33CA. Peak pulse current is 13.2A, which is within 1% of the original specification. Operating temperature range is -65°C to 150°C.

Q: Why is P6SMB33CAHE3_A/H listed if it is obsolete?

A: P6SMB33CAHE3_A/H is included for reference purposes only to document historical equivalents. This part is marked as obsolete and must not be used in new designs. Use active alternatives instead.

Q: Does package compatibility matter when selecting a substitute?

A: Yes. All listed substitutes use the DO-214AA (SMB) surface mount package, ensuring mechanical and electrical compatibility with the original TPSMB33CA. Verify PCB footprint and reflow profile compatibility with your manufacturing process.

Q: What is the significance of the pulse width specification (10/1000µs versus 8/20µs)?

A: Pulse width defines the transient event duration used in the peak pulse current specification. The TPSMB33CA and most 45.7V variants use 10/1000µs pulse width, while SM6T33CA and SM6T33CAY use 8/20µs. These represent different transient event profiles and are not directly comparable. Select parts based on your application's actual transient waveform characteristics.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance status, matching the TPSMB33CA. Moisture sensitivity level (MSL) is 1 (Unlimited) for all parts, indicating no special moisture handling requirements.

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