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P6SMBJ56 Equivalent & Substitute Parts
Part Overview
The P6SMBJ56 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 47.8V reverse standoff voltage, 80.85V maximum clamping voltage, and 7.9A peak pulse current capability in a DO-214AA (SMB) package. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs or production continuity.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 47.8 | V |
| Voltage - Breakdown (Min) | 50.4 | V |
| Voltage - Clamping (Max) @ Ipp | 80.85 | V |
| Current - Peak Pulse (10/1000µs) | 7.9 | A |
| Power - Peak Pulse | 600 | W |
| Operating Temperature Range | -55 to 150 | °C (TJ) |
| Package / Case | DO-214AA, SMB | — |
| Mounting Type | Surface Mount | — |
| Type | Zener | — |
| Unidirectional Channels | 1 | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitution of the P6SMBJ56 is determined by the following critical electrical and mechanical parameters:
- Voltage - Reverse Standoff (Typ): 47.8V nominal operating point
- Voltage - Clamping (Max) @ Ipp: Maximum 80.85V at peak pulse current
- Current - Peak Pulse (10/1000µs): 7.9A minimum requirement
- Power - Peak Pulse: 600W dissipation capability
- Package / Case: DO-214AA (SMB) surface-mount form factor
- Unidirectional Channels: Single channel configuration
- Operating Temperature: -55°C to 150°C minimum range
- RoHS Compliance: ROHS3 Compliant
Substitute parts are grouped into two categories based on electrical performance:
Category A (Direct Electrical Equivalents): Parts maintaining 47.8V reverse standoff, 7.8–7.9A peak pulse current, 600W power rating, and 77–80.85V clamping voltage. These include SMBJP6KE56A-TP, P6SMB56A variants (Eaton, Vishay), and P6SMB56 (Taiwan Semiconductor).
Category B (Enhanced Performance Substitutes): Parts with identical voltage parameters but increased peak pulse current (13A) and power rating (1000W), enabling higher transient energy absorption. These include 1KSMB56A and 1KSMB56AH (Taiwan Semiconductor).
Parameter Comparison
| Part Number | Manufacturer | VWM (Typ) [V] | VBR (Min) [V] | VC (Max) @ Ipp [V] | Ipp [A] | PPP [W] | Temp Range [°C] | Package | Status |
|---|---|---|---|---|---|---|---|---|---|
| P6SMBJ56 | Littelfuse Inc. | 47.8 | 50.4 | 80.85 | 7.9 | 600 | -55 to 150 | DO-214AA (SMB) | Obsolete |
| SMBJP6KE56A-TP | Micro Commercial Co | 47.8 | 53.2 | 77 | 7.9 | 600 | -55 to 175 | DO-214AA (SMB) | Active |
| 1KSMB56A | Taiwan Semiconductor Corporation | 47.8 | 53.2 | 77 | 13 | 1000 | -55 to 175 | DO-214AA (SMB) | Active |
| 1KSMB56AH | Taiwan Semiconductor Corporation | 47.8 | 53.2 | 77 | 13 | 1000 | -55 to 175 | DO-214AA (SMB) | Active |
| P6SMB56 | Taiwan Semiconductor Corporation | 45.4 | 50.4 | 80.5 | 7.8 | 600 | -55 to 150 | DO-214AA (SMB) | Active |
| P6SMB56A | Eaton - Electronics Division | 47.8 | 53.2 | 77 | 7.9 | 600 | -55 to 150 | DO-214AA (SMB) | Active |
| P6SMB56A-E3/52 | Vishay General Semiconductor | 47.8 | 53.2 | 77 | 7.8 | 600 | -65 to 150 | DO-214AA (SMB) | Active |
| P6SMB56A-E3/5B | Vishay General Semiconductor | 47.8 | 53.2 | 77 | 7.8 | 600 | -65 to 150 | DO-214AA (SMB) | Active |
| P6SMB56A-M3/52 | Vishay General Semiconductor | 47.8 | 53.2 | 77 | 7.8 | 600 | -65 to 150 | DO-214AA (SMB) | Active |
| P6SMB56A-M3/5B | Vishay General Semiconductor | 47.8 | 53.2 | 77 | 7.8 | 600 | -65 to 150 | DO-214AA (SMB) | Active |
Engineering Selection Recommendations
Primary Substitutes (Direct Replacement)
SMBJP6KE56A-TP (Micro Commercial Co) and P6SMB56A variants from Eaton and Vishay are direct electrical equivalents with active product status. These maintain the 47.8V reverse standoff voltage, 7.8–7.9A peak pulse current, and 600W power dissipation. All are ROHS3 compliant and rated for -55°C to 150°C or -55°C to 175°C operating temperature ranges. The Vishay variants (P6SMB56A-E3/52, P6SMB56A-E3/5B, P6SMB56A-M3/52, P6SMB56A-M3/5B) extend the lower temperature limit to -65°C and are available in both tape & reel and tape & box packaging options.
Enhanced Performance Substitutes
The 1KSMB56A and 1KSMB56AH from Taiwan Semiconductor Corporation provide increased peak pulse current (13A) and power dissipation (1000W) while maintaining identical voltage parameters. The 1KSMB56AH includes AEC-Q101 automotive qualification. These parts are suitable for applications requiring higher transient energy absorption within the same voltage class.
Alternative Consideration
P6SMB56 (Taiwan Semiconductor Corporation) operates at a slightly lower reverse standoff voltage (45.4V) and clamping voltage (80.5V) compared to the P6SMBJ56 specification. This part is suitable only when the lower voltage rating is acceptable for the application.
Frequently Asked Questions (FAQ)
Q: Can I use 1KSMB56A as a direct replacement for P6SMBJ56?
A: Yes. The 1KSMB56A maintains the same 47.8V reverse standoff voltage and 77V clamping voltage as the P6SMBJ56. The increased peak pulse current (13A vs. 7.9A) and power rating (1000W vs. 600W) provide enhanced transient protection capability. The DO-214AA (SMB) package is identical. Electrical compatibility is confirmed.
Q: What is the difference between P6SMB56A-E3/52 and P6SMB56A-M3/52?
A: Both parts are manufactured by Vishay and share identical electrical specifications (47.8V VWM, 77V clamping, 7.8A Ipp, 600W power). The primary difference is packaging: P6SMB56A-E3/52 is supplied in tape & reel (TR), while P6SMB56A-M3/52 is supplied in tape & box (TB). Electrical performance and temperature range (-65°C to 150°C) are equivalent.
Q: Is SMBJP6KE56A-TP compatible with the P6SMBJ56?
A: Yes. SMBJP6KE56A-TP from Micro Commercial Co is electrically compatible. It maintains the 47.8V reverse standoff voltage and 7.9A peak pulse current. The clamping voltage is 77V (compared to 80.85V for the P6SMBJ56), which is within acceptable substitution parameters. Operating temperature range extends to 175°C. The part is supplied in tape & reel packaging.
Q: Why does P6SMB56 have a lower reverse standoff voltage (45.4V)?
A: P6SMB56 is a different voltage rating within the P6SMB series. While it shares the same package and general application class, the 45.4V reverse standoff voltage makes it unsuitable as a direct replacement for the P6SMBJ56 (47.8V). Use this part only if your circuit design specifically requires the lower voltage rating.
Q: Are all substitute parts ROHS3 compliant?
A: All listed substitute parts are ROHS3 compliant or RoHS compliant, matching the environmental compliance of the P6SMBJ56. Moisture sensitivity level (MSL) is rated at 1 (Unlimited) for all parts, indicating no special moisture handling requirements.
Q: What is the significance of the 1KSMB56AH automotive qualification?
A: The 1KSMB56AH carries AEC-Q101 qualification, indicating it meets automotive-grade reliability standards. This qualification is relevant only if your application requires automotive-grade components. For general-purpose applications, the standard 1KSMB56A is functionally equivalent.
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