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P6SMB6.8 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts
Part Overview
The P6SMB6.8 is a unidirectional Zener-type transient voltage suppressor manufactured by Littelfuse Inc. in DO-214AA (SMB) surface mount package. This component is designed for general-purpose transient voltage suppression applications with a reverse standoff voltage of 5.8V and peak pulse power rating of 600W. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Reverse Standoff Voltage (Typ) | 5.8V |
| Voltage - Breakdown (Min) | 6.12V |
| Voltage - Clamping (Max) @ Ipp | 11.03V |
| Current - Peak Pulse (10/1000µs) | 58.1A |
| Power - Peak Pulse | 600W |
| Package / Case | DO-214AA, SMB |
| Operating Temperature Range | -55°C ~ 150°C (TJ) |
| Type | Zener |
| Unidirectional Channels | 1 |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the P6SMB6.8 is determined by the following critical parameters:
- Reverse Standoff Voltage: 5.8V (must match)
- Package / Case: DO-214AA, SMB (must match for PCB compatibility)
- Unidirectional Channels: 1 (must match)
- Type: Zener (must match)
- Power - Peak Pulse: 600W (must match)
- RoHS Status: ROHS3 Compliant (must match)
Substitute parts are grouped into two categories based on clamping voltage performance:
Category A - Standard Clamping (10.5V): Parts with clamping voltage of 10.5V at Ipp, representing the primary substitution path. These include P6SMB6.8A (Taiwan Semiconductor Corporation), SZP6SMB6.8AT3G (Littelfuse Inc.), SM6T6V8A-E3/52 (Vishay), SM6T6V8A-E3/5B (Vishay), SMBJP6KE6.8A-TP (Micro Commercial Co), and TVP06B6V8A-G (Comchip Technology).
Category B - Enhanced Clamping (13.4V): Parts with higher clamping voltage of 13.4V at Ipp, suitable for applications requiring additional transient suppression margin. These include SM6T6V8A (STMicroelectronics) and SM6T6V8AY (STMicroelectronics).
All substitute parts maintain the same reverse standoff voltage (5.8V), package format (DO-214AA/SMB), and power rating (600W) as the original P6SMB6.8.
Parameter Comparison
| Part Number | Manufacturer | Reverse Standoff (V) | Breakdown Min (V) | Clamping Max @ Ipp (V) | Peak Pulse Current (A) | Operating Temp (°C) | Package | Product Status |
|---|---|---|---|---|---|---|---|---|
| P6SMB6.8 | Littelfuse Inc. | 5.8 | 6.12 | 11.03 | 58.1 | -55 ~ 150 | DO-214AA (SMBJ) | Obsolete |
| P6SMB6.8A | Taiwan Semiconductor Corporation | 5.8 | 6.46 | 10.5 | 60 | -55 ~ 150 | DO-214AA (SMB) | Active |
| SZP6SMB6.8AT3G | Littelfuse Inc. | 5.8 | 6.45 | 10.5 | 57 | -65 ~ 150 | DO-214AA (SMB) | Active |
| SM6T6V8A-E3/52 | Vishay General Semiconductor | 5.8 | 6.45 | 10.5 | 57 | -65 ~ 150 | DO-214AA (SMBJ) | Active |
| SM6T6V8A-E3/5B | Vishay General Semiconductor | 5.8 | 6.45 | 10.5 | 57 | -65 ~ 150 | DO-214AA (SMBJ) | Active |
| SMBJP6KE6.8A-TP | Micro Commercial Co | 5.8 | 6.45 | 10.5 | 58.1 | -55 ~ 175 | DO-214AA (SMBJ) | Active |
| TVP06B6V8A-G | Comchip Technology | 5.8 | 6.46 | 10.5 | 57.14 | -55 ~ 150 | DO-214AA (SMB) | Active |
| SM6T6V8A | STMicroelectronics | 5.8 | 6.45 | 13.4 | 298 (8/20µs) | -55 ~ 150 | DO-214AA (SMB) | Active |
| SM6T6V8AY | STMicroelectronics | 5.8 | 6.45 | 13.4 | 298 (8/20µs) | -55 ~ 150 | DO-214AA (SMB) | Active |
Engineering Selection Recommendations
Primary Substitutes (Category A - 10.5V Clamping):
P6SMB6.8A (Taiwan Semiconductor Corporation), SZP6SMB6.8AT3G (Littelfuse Inc.), SM6T6V8A-E3/52 (Vishay), SM6T6V8A-E3/5B (Vishay), SMBJP6KE6.8A-TP (Micro Commercial Co), and TVP06B6V8A-G (Comchip Technology) are direct functional equivalents. All maintain the 5.8V reverse standoff voltage, DO-214AA/SMB package compatibility, and 600W peak pulse power rating. These parts are in active production status and ROHS3 compliant. The clamping voltage of 10.5V is lower than the original P6SMB6.8 (11.03V), providing tighter transient suppression. Selection among these should be based on availability, lead time, and packaging preference (Cut Tape vs. Tape & Reel).
SZP6SMB6.8AT3G and SM6T6V8A-E3/52 offer extended operating temperature range (-65°C to 150°C) compared to the original part (-55°C to 150°C), providing additional thermal margin for demanding applications.
SMBJP6KE6.8A-TP extends the upper operating temperature to 175°C, suitable for high-temperature environments.
Secondary Substitutes (Category B - 13.4V Clamping):
SM6T6V8A (STMicroelectronics) and SM6T6V8AY (STMicroelectronics) provide higher clamping voltage (13.4V) with significantly increased peak pulse current capability (298A at 8/20µs pulse). These parts are suitable only when the application can tolerate higher clamping voltage and requires enhanced transient suppression performance. SM6T6V8AY includes AEC-Q101 automotive qualification.
Frequently Asked Questions (FAQ)
Q: Can I use a substitute part with 10.5V clamping instead of the original 11.03V clamping?
A: Yes. The 10.5V clamping voltage is within acceptable substitution parameters. The lower clamping voltage provides tighter transient suppression, which is generally beneficial. Verify that your circuit design does not depend on the specific 11.03V clamping characteristic.
Q: What is the difference between DO-214AA (SMBJ) and DO-214AA (SMB) package designations?
A: Both designations refer to the same physical DO-214AA package format used in surface mount applications. The SMBJ and SMB suffixes are manufacturer-specific nomenclature variants. All parts listed are mechanically and electrically compatible in the same PCB footprint.
Q: Are the Category B parts (13.4V clamping) compatible with my design?
A: Category B parts (SM6T6V8A and SM6T6V8AY) have the same reverse standoff voltage (5.8V) and package format but provide higher clamping voltage (13.4V) and significantly higher peak pulse current (298A). Use these only if your application requires enhanced transient suppression performance. Verify circuit compatibility before substitution.
Q: Which substitute offers the widest operating temperature range?
A: SZP6SMB6.8AT3G and SM6T6V8A-E3/52 both operate from -65°C to 150°C, providing the widest lower temperature range. SMBJP6KE6.8A-TP extends to 175°C on the upper end.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All substitute parts listed are ROHS3 compliant and have MSL rating of 1 (Unlimited), matching the original P6SMB6.8 specifications.
Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?
A: Cut Tape packaging is supplied in individual strips suitable for manual assembly or small-volume production. Tape & Reel packaging is supplied on continuous reels for automated pick-and-place assembly. Both formats contain identical components; selection depends on your assembly process requirements.
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