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P6SMB33CA-M3/52 Equivalent & Substitute Parts
Part Overview
The P6SMB33CA-M3/52 is a transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This bidirectional Zener diode operates in the DO-214AA (SMB) surface mount package and is designed for general-purpose transient voltage suppression applications. The part is active in production status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). Equivalent and substitute parts are identified based on matching electrical performance parameters and package compatibility to support design flexibility and supply chain continuity.
Substiute Parts
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) | 13.1A |
| Power - Peak Pulse | 600W |
| Operating Temperature Range | -65°C ~ 150°C (TJ) |
| Package / Case | DO-214AA, SMB |
| Mounting Type | Surface Mount |
| Type | Zener |
| Bidirectional Channels | 1 |
Substitute Part Grouping Explanation
Substitution eligibility for the P6SMB33CA-M3/52 is determined by the following critical parameters:
- Voltage - Reverse Standoff (Typ): 28.2V
- Voltage - Breakdown (Min): 31.4V
- Voltage - Clamping (Max) @ Ipp: 45.7V
- Current - Peak Pulse (10/1000µs): 13.1A minimum
- Power - Peak Pulse: 600W
- Package / Case: DO-214AA, SMB (surface mount)
- Bidirectional Channels: 1
- Type: Zener
Parts are grouped into three categories based on substitution relationship:
Direct Equivalent: P6SMB33CA-E3/52 (Vishay) differs only in packaging format (Tape & Reel vs. Tape & Box) with identical electrical specifications.
Upgrade/Cross-Manufacturer Substitutes: SMBJP6KE33CA-TP (Micro Commercial Co), P6SMB33CAH (Taiwan Semiconductor Corporation), and SZP6SMB33CAT3G (Littelfuse) maintain the core voltage and power specifications with peak pulse current variations within acceptable tolerance (13.2A to 13.8A).
Alternative Performance Substitutes: SM6T33CA and SM6T33CAY (STMicroelectronics) maintain voltage specifications but feature higher peak pulse current capability (68A at 8/20µs) and elevated clamping voltage (59V), suitable for applications requiring enhanced transient suppression performance.
Extended Temperature Range Substitute: TPSMB33CA (Littelfuse) provides identical electrical performance with extended upper operating temperature limit (-65°C ~ 175°C vs. -65°C ~ 150°C).
Parameter Comparison
| Part Number | Manufacturer | Vwm (Typ) | Vbr (Min) | Vc (Max) @ Ipp | Ipp (10/1000µs) | Pkg Format | Temp Range | Grade |
|---|---|---|---|---|---|---|---|---|
| P6SMB33CA-M3/52 | Vishay | 28.2V | 31.4V | 45.7V | 13.1A | TB | -65°C ~ 150°C | Commercial |
| P6SMB33CA-E3/52 | Vishay | 28.2V | 31.4V | 45.7V | 13.1A | TR | -65°C ~ 150°C | Commercial |
| SMBJP6KE33CA-TP | Micro Commercial Co | 28.2V | 31.4V | 45.7V | 13.3A | TR | -55°C ~ 175°C | Commercial |
| P6SMB33CA | Eaton | 28.2V | 31.4V | 45.7V | 13.3A | CT | -55°C ~ 150°C | Commercial |
| P6SMB33CAH | Taiwan Semiconductor | 28.2V | 31.4V | 45.7V | 13.8A | TR | -55°C ~ 150°C | Automotive (AEC-Q101) |
| SM6T33CA | STMicroelectronics | 28.2V | 31.4V | 59V | 68A (8/20µs) | CT | -55°C ~ 150°C | Commercial |
| SM6T33CAY | STMicroelectronics | 28.2V | 31.4V | 59V | 68A (8/20µs) | CT | -55°C ~ 150°C | Automotive (AEC-Q101) |
| SZP6SMB33CAT3G | Littelfuse | 28.2V | 31.4V | 45.7V | 13.2A | TR | -65°C ~ 150°C | Automotive (AEC-Q101) |
| TPSMB33CA | Littelfuse | 28.2V | 31.4V | 45.7V | 13.3A | CT | -65°C ~ 175°C | Automotive (AEC-Q101) |
Engineering Selection Recommendations
Direct Replacement (Identical Electrical Performance)
P6SMB33CA-E3/52 is a direct equivalent differing only in packaging format (Tape & Reel). Selection between M3/52 and E3/52 depends on procurement and assembly requirements.
Cross-Manufacturer Substitutes (Matched Specifications)
SMBJP6KE33CA-TP, P6SMB33CA (Eaton), and SZP6SMB33CAT3G maintain electrical equivalence with peak pulse current within 13.1A to 13.3A range. These parts are suitable for direct substitution in general-purpose applications. SZP6SMB33CAT3G and TPSMB33CA carry AEC-Q101 automotive qualification, enabling use in automotive-grade designs.
Enhanced Performance Substitutes (Higher Current Capability)
SM6T33CA and SM6T33CAY provide 68A peak pulse current (8/20µs measurement) versus 13.1A (10/1000µs measurement), with elevated clamping voltage of 59V. These parts are suitable for applications requiring superior transient suppression performance. SM6T33CAY carries AEC-Q101 qualification for automotive applications.
Extended Temperature Operation
TPSMB33CA extends the upper operating temperature limit to 175°C, supporting designs requiring operation beyond the standard 150°C maximum junction temperature. This part maintains electrical equivalence while providing thermal margin for high-temperature environments.
Compliance and Certification
All listed substitutes maintain ROHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating. Automotive-grade parts (P6SMB33CAH, SM6T33CAY, SZP6SMB33CAT3G, TPSMB33CA) carry AEC-Q101 qualification for automotive applications.
Frequently Asked Questions (FAQ)
Q: Can P6SMB33CA-E3/52 replace P6SMB33CA-M3/52 directly?
A: Yes. Both parts are identical in electrical specifications and package type (DO-214AA, SMB). The difference is packaging format: M3/52 uses Tape & Box while E3/52 uses Tape & Reel. Selection depends on assembly line requirements and tape reel compatibility.
Q: What is the difference between 10/1000µs and 8/20µs pulse measurements?
A: These represent different test pulse waveforms. The 10/1000µs waveform (used for P6SMB series) and 8/20µs waveform (used for SM6T series) measure peak pulse current under different transient conditions. SM6T33CA and SM6T33CAY show higher current capability (68A) due to the 8/20µs measurement standard, which represents a different transient profile than the 10/1000µs standard.
Q: Are automotive-grade parts (AEC-Q101) compatible with commercial applications?
A: Yes. Automotive-qualified parts exceed commercial-grade requirements and are fully compatible with commercial designs. Using AEC-Q101 qualified parts in commercial applications provides additional reliability margin without design modification.
Q: Can SM6T33CA or SM6T33CAY be used as direct replacements?
A: These parts maintain the same reverse standoff voltage (28.2V) and breakdown voltage (31.4V) but feature higher clamping voltage (59V vs. 45.7V) and significantly higher peak pulse current (68A vs. 13.1A). They are suitable substitutes for applications requiring enhanced transient suppression performance but should be evaluated for circuit compatibility due to the higher clamping voltage.
Q: What is the impact of operating temperature range differences?
A: P6SMB33CA-M3/52 operates from -65°C to 150°C. SMBJP6KE33CA-TP and Eaton P6SMB33CA operate from -55°C to 150°C (narrower low-temperature range). TPSMB33CA extends to 175°C. Selection depends on application temperature requirements. For designs requiring -65°C operation, use P6SMB33CA-M3/52, P6SMB33CA-E3/52, SZP6SMB33CAT3G, or TPSMB33CA.
Q: Is packaging format (Tape & Box vs. Tape & Reel) interchangeable?
A: Packaging format affects procurement and assembly logistics but not electrical performance or PCB mounting. Tape & Reel (TR) format is standard for automated assembly lines, while Tape & Box (TB) format is used for manual assembly or lower-volume applications. Verify compatibility with your assembly equipment before substitution.
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