P6SMB33C Equivalent & Substitute Parts

Part Overview

The P6SMB33C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This bidirectional Zener diode operates with a reverse standoff voltage of 28.2V and provides clamping at 47.99V with a peak pulse current of 13.3A in a surface-mount DO-214AA (SMB) package.

The P6SMB33C is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Key Parameters

Parameter	Value
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)
Package / Case	DO-214AA, SMB
Type	Zener, Bidirectional
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the P6SMB33C is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 28.2V
Voltage - Clamping (Max) @ Ipp: 45.7V to 59V range
Current - Peak Pulse: 13.1A to 68A
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB
Operating Temperature: -55°C to -65°C minimum; 150°C to 175°C maximum
Type: Zener, Bidirectional, Surface Mount

Substitute parts maintain the same reverse standoff voltage (28.2V) and package form factor (DO-214AA/SMB). Clamping voltage and peak pulse current vary within acceptable ranges for TVS diode applications. All substitutes are RoHS compliant and have MSL rating of 1.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Operating Temperature	Product Status	Package
P6SMB33C	Littelfuse Inc.	28.2V	47.99V	13.3A	-55°C ~ 150°C	Obsolete	DO-214AA, SMB
P6SMB33CA	Eaton - Electronics Division	28.2V	45.7V	13.3A	-55°C ~ 150°C	Active	DO-214AA, SMB
SZP6SMB33CAT3G	Littelfuse	28.2V	45.7V	13.2A	-65°C ~ 150°C	Active	DO-214AA, SMB
P6SMB33CAHE3_A/H	Vishay General Semiconductor - Diodes Division	28.2V	45.7V	13.1A	-65°C ~ 150°C	Obsolete	DO-214AA, SMB
SM6T33CA	STMicroelectronics	28.2V	59V	68A (8/20µs)	-55°C ~ 150°C	Active	DO-214AA, SMB
SM6T33CA-E3/52	Vishay General Semiconductor - Diodes Division	28.2V	45.7V	13.1A	-65°C ~ 150°C	Active	DO-214AA, SMB
SM6T33CAY	STMicroelectronics	28.2V	59V	68A (8/20µs)	-55°C ~ 150°C	Active	DO-214AA, SMB
SMBJP6KE33CA-TP	Micro Commercial Co	28.2V	45.7V	13.3A	-55°C ~ 175°C	Active	DO-214AA, SMB

Engineering Selection Recommendations

For direct replacement of the obsolete P6SMB33C, the following active-status parts are recommended based on electrical parameter compatibility and product availability:

Primary Substitutes (Closest Electrical Match):

P6SMB33CA (Eaton) - Active status, identical reverse standoff voltage, matching peak pulse current (13.3A), clamping voltage 45.7V
SMBJP6KE33CA-TP (Micro Commercial Co) - Active status, identical reverse standoff voltage and peak pulse current, extended operating temperature range to 175°C, clamping voltage 45.7V
SZP6SMB33CAT3G (Littelfuse) - Active status, same manufacturer as original, extended lower temperature rating (-65°C), clamping voltage 45.7V

Alternative Substitutes (Higher Current Capability):

SM6T33CA (STMicroelectronics) - Active status, higher peak pulse current (68A at 8/20µs), higher clamping voltage (59V), same reverse standoff voltage
SM6T33CAY (STMicroelectronics) - Active status, automotive-qualified (AEC-Q101), higher peak pulse current and clamping voltage

Obsolete Alternatives (Not Recommended for New Designs):

P6SMB33CAHE3_A/H (Vishay) - Obsolete status, automotive-qualified, extended temperature range

All recommended substitutes maintain the DO-214AA (SMB) package form factor, RoHS3 compliance, and MSL rating of 1 (Unlimited).

Frequently Asked Questions (FAQ)

Q: Can P6SMB33CA directly replace P6SMB33C? A: Yes. Both parts share the same reverse standoff voltage (28.2V), peak pulse current (13.3A), power rating (600W), and package (DO-214AA/SMB). The clamping voltage is slightly lower (45.7V vs. 47.99V), which is within acceptable TVS diode tolerance ranges for the 28.2V standoff class.

Q: What is the difference between P6SMB33CA and SZP6SMB33CAT3G? A: Both are active-status substitutes with identical electrical parameters. SZP6SMB33CAT3G offers an extended lower operating temperature limit (-65°C vs. -55°C) and is supplied in Tape & Reel packaging. P6SMB33CA is available in Cut Tape & Digi-Reel packaging.

Q: Why do SM6T33CA and SM6T33CAY have higher peak pulse current ratings? A: These parts belong to the SM6T series, which is a higher-current TVS diode family. While they maintain the same 28.2V reverse standoff voltage and DO-214AA package, they provide 68A peak pulse current (8/20µs) versus 13.3A (10/1000µs) in the P6SMB series. Selection depends on application-specific surge current requirements.

Q: Are all substitutes RoHS compliant? A: Yes. All listed substitute parts are RoHS3 compliant with MSL rating of 1 (Unlimited), matching the original P6SMB33C specifications.

Q: Which substitute has the widest operating temperature range? A: SMBJP6KE33CA-TP (Micro Commercial Co) offers the highest maximum operating temperature at 175°C, compared to 150°C for most other substitutes. SZP6SMB33CAT3G and SM6T33CA-E3/52 extend the minimum temperature to -65°C.

Q: Can I use automotive-qualified parts as substitutes? A: Yes, if your application requires automotive qualification. SM6T33CAY and P6SMB33CAHE3_A/H carry AEC-Q101 qualification. However, P6SMB33CAHE3_A/H is obsolete; SM6T33CAY is the active automotive-qualified alternative.

Q: What packaging options are available for substitutes? A: Substitutes are supplied in Cut Tape (CT) & Digi-Reel or Tape & Reel (TR) formats. All maintain the DO-214AA (SMB) component package for PCB compatibility.

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