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P6SMB15CAT3 Equivalent & Substitute Parts
Part Overview
The P6SMB15CAT3 is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for surface mount applications in the DO-214AA (SMB) package. This component provides bidirectional overvoltage protection with a 12.8V reverse standoff voltage and 21.2V maximum clamping voltage at peak pulse current of 28A. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | P6SMB15CAT3 |
| Manufacturer | onsemi |
| Category | Transient Voltage Suppressors (TVS) |
| Package / Case | DO-214AA, SMB |
| Type | Zener |
| Bidirectional Channels | 1 |
| Voltage - Reverse Standoff (Typ) | 12.8V |
| Voltage - Breakdown (Min) | 14.3V |
| Voltage - Clamping (Max) @ Ipp | 21.2V |
| Current - Peak Pulse (10/1000µs) | 28A |
| Power - Peak Pulse | 600W |
| Operating Temperature | -65°C ~ 150°C (TJ) |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
| RoHS Status | RoHS non-compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the P6SMB15CAT3 is determined by strict alignment of the following electrical and mechanical parameters:
Critical Matching Parameters:
- Voltage - Reverse Standoff (Typ): 12.8V
- Voltage - Breakdown (Min): 14.3V
- Voltage - Clamping (Max) @ Ipp: 21.2V
- Current - Peak Pulse (10/1000µs): minimum 28A
- Power - Peak Pulse: 600W minimum
- Package / Case: DO-214AA, SMB (surface mount)
- Type: Zener, Bidirectional (1 channel)
- Mounting Type: Surface Mount
Substitute parts are grouped into two categories based on electrical performance alignment:
Group 1 - Direct Electrical Equivalents (Clamping Voltage 21.2V): Parts maintaining identical clamping voltage of 21.2V with peak pulse current at or above 28A. These include P6SMB15CA (Eaton), P6SMB15CA-M3/5B (Vishay), P6SMB15CA-M3/52 (Vishay), SM6T15CA-M3/52 (Vishay), SM6T15CA-M3/5B (Vishay), and 1KSMB15CA (Taiwan Semiconductor Corporation).
Group 2 - Higher Clamping Voltage Variants (27.2V): Parts with elevated clamping voltage of 27.2V, including SM6T15CA (STMicroelectronics) and SM6T15CAY (STMicroelectronics). These provide enhanced transient suppression margin but operate at higher clamping levels.
Group 3 - Marginal Voltage Deviation: SMBJ13CA (MDD) with 13V reverse standoff and 21.5V clamping voltage represents a near-equivalent with minor voltage parameter variance.
Parameter Comparison
| 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 | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|
| P6SMB15CAT3 | onsemi | 12.8V | 14.3V | 21.2V | 28A | 600W | -65°C ~ 150°C | DO-214AA, SMB | Obsolete | RoHS non-compliant |
| 1KSMB15CA | Taiwan Semiconductor Corporation | 12.8V | 14.3V | 21.2V | 47.2A | 1000W | -55°C ~ 175°C | DO-214AA, SMB | Active | ROHS3 Compliant |
| P6SMB15CA | Eaton - Electronics Division | 12.8V | 14.3V | 21.2V | 28.8A | 600W | -55°C ~ 150°C | DO-214AA, SMB | Active | RoHS Compliant |
| P6SMB15CA-M3/52 | Vishay General Semiconductor - Diodes Division | 12.8V | 14.3V | 21.2V | 28.3A | 600W | -65°C ~ 150°C | DO-214AA, SMB | Active | ROHS3 Compliant |
| P6SMB15CA-M3/5B | Vishay General Semiconductor - Diodes Division | 12.8V | 14.3V | 21.2V | 28.3A | 600W | -65°C ~ 150°C | DO-214AA, SMB | Active | ROHS3 Compliant |
| SM6T15CA | STMicroelectronics | 12.8V | 14.3V | 27.2V | 147A (8/20µs) | 600W | -55°C ~ 150°C | DO-214AA, SMB | Active | ROHS3 Compliant |
| SM6T15CA-M3/52 | Vishay General Semiconductor - Diodes Division | 12.8V | 14.3V | 21.2V | 28A | 600W | -65°C ~ 150°C | DO-214AA, SMB | Active | ROHS3 Compliant |
| SM6T15CA-M3/5B | Vishay General Semiconductor - Diodes Division | 12.8V | 14.3V | 21.2V | 28A | 600W | -65°C ~ 150°C | DO-214AA, SMB | Active | ROHS3 Compliant |
| SM6T15CAY | STMicroelectronics | 12.8V | 14.3V | 27.2V | 147A (8/20µs) | 600W | -55°C ~ 150°C | DO-214AA, SMB | Active | ROHS3 Compliant |
| SMBJ13CA | MDD | 13V | 14.4V | 21.5V | 28A | 600W | -50°C ~ 150°C | DO-214AA, SMB | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Substitutes (Direct Electrical Equivalents):
P6SMB15CA (Eaton), P6SMB15CA-M3/5B (Vishay), and P6SMB15CA-M3/52 (Vishay) are direct electrical equivalents with matching 12.8V reverse standoff and 21.2V clamping voltage. All three are active products with RoHS3 compliance, addressing the obsolescence and regulatory status of the original P6SMB15CAT3. Peak pulse current specifications (28.3A to 28.8A) meet or exceed the original 28A requirement. Operating temperature ranges of -65°C to -55°C minimum and 150°C maximum are compatible with the original specification.
SM6T15CA-M3/52 (Vishay) and SM6T15CA-M3/5B (Vishay) maintain identical electrical parameters with active product status and RoHS3 compliance. These components are suitable for direct substitution in applications requiring the original electrical performance envelope.
Enhanced Performance Alternatives:
1KSMB15CA (Taiwan Semiconductor Corporation) provides superior electrical performance with 47.2A peak pulse current and 1000W power rating, both significantly exceeding original specifications. This component is active and RoHS3 compliant, with extended operating temperature range (-55°C to 175°C). Selection is appropriate for applications requiring enhanced transient suppression margin.
Higher Clamping Voltage Options:
SM6T15CA (STMicroelectronics) and SM6T15CAY (STMicroelectronics) operate at 27.2V clamping voltage with substantially higher peak pulse current (147A at 8/20µs pulse). These components are active and RoHS3 compliant. Selection is appropriate only when circuit design accommodates the elevated clamping voltage and enhanced current handling capability.
Marginal Equivalents:
SMBJ13CA (MDD) presents minor voltage parameter variance (13V reverse standoff versus 12.8V, 21.5V clamping versus 21.2V). This component is active and RoHS3 compliant but should be selected only when circuit tolerance permits the voltage deviation.
Frequently Asked Questions (FAQ)
Q: Can P6SMB15CA (Eaton) directly replace P6SMB15CAT3 in existing designs?
A: Yes. P6SMB15CA maintains identical reverse standoff voltage (12.8V), breakdown voltage (14.3V), and clamping voltage (21.2V). Peak pulse current (28.8A) exceeds the original 28A specification. Both components use DO-214AA (SMB) surface mount packaging. The primary difference is product status (active versus obsolete) and RoHS compliance (compliant versus non-compliant).
Q: What is the difference between P6SMB15CA-M3/5B and P6SMB15CA-M3/52?
A: Both Vishay components maintain identical electrical specifications: 12.8V reverse standoff, 14.3V breakdown, 21.2V clamping, and 28.3A peak pulse current. The designations M3/5B and M3/52 indicate different packaging configurations (Tape & Box versus alternative tape specification). Electrical performance is equivalent; packaging selection depends on procurement and assembly requirements.
Q: When should SM6T15CA be selected instead of direct P6SMB15CA equivalents?
A: SM6T15CA operates at 27.2V clamping voltage with 147A peak pulse current (8/20µs), compared to 21.2V and 28A for direct equivalents. Selection is appropriate only when circuit design specifically requires the higher clamping voltage and enhanced current handling. The elevated clamping voltage may affect circuit behavior in sensitive applications.
Q: Is 1KSMB15CA suitable for all P6SMB15CAT3 applications?
A: 1KSMB15CA maintains the critical electrical parameters (12.8V reverse standoff, 21.2V clamping) but provides enhanced performance (47.2A peak pulse, 1000W power rating). It is suitable for applications where the original specifications represent minimum requirements. The extended operating temperature range (-55°C to 175°C) provides additional thermal margin.
Q: What is the significance of RoHS compliance in substitute selection?
A: The original P6SMB15CAT3 is RoHS non-compliant. All listed substitute components are RoHS3 compliant, meeting current regulatory requirements for new designs and production. This compliance status is mandatory for applications subject to RoHS directives and represents a key advantage of transitioning to active substitute components.
Q: Can SMBJ13CA be used as a substitute despite voltage parameter differences?
A: SMBJ13CA presents minor voltage deviations (13V reverse standoff versus 12.8V, 21.5V clamping versus 21.2V). Substitution is permissible only when circuit design tolerance accommodates these variations. The 0.2V reverse standoff increase and 0.3V clamping increase may affect circuit performance in sensitive applications requiring precise voltage regulation.
Q: Are all substitute parts available in the same packaging?
A: All listed substitute components use DO-214AA (SMB) surface mount packaging, maintaining mechanical compatibility with the original P6SMB15CAT3. Packaging variants (Cut Tape, Tape & Box, Tape & Reel) affect procurement and assembly logistics but do not alter electrical or mechanical fit characteristics.
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