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P6SMB6.8C Equivalent & Substitute Parts
Part Overview
The P6SMB6.8C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 5.8V reverse standoff voltage, 11.03V maximum clamping voltage, and 58.1A peak pulse current capability in a DO-214AA (SMB) package. The part is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Reverse Standoff Voltage (Typ) | 5.8 | V |
| Breakdown Voltage (Min) | 6.12 | V |
| Clamping Voltage (Max) @ Ipp | 11.03 | V |
| Peak Pulse Current (10/1000µs) | 58.1 | A |
| Peak Pulse Power | 600 | W |
| Operating Temperature Range | -55 to 150 | °C (TJ) |
| Package / Case | DO-214AA, SMB | — |
| Mounting Type | Surface Mount | — |
| Diode Type | Zener | — |
| Bidirectional Channels | 1 | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitution of the P6SMB6.8C is determined by the following critical parameters:
- Reverse standoff voltage: 5.8V (nominal)
- Breakdown voltage range: 6.12V minimum
- Clamping voltage: 10.5V to 13.4V maximum
- Peak pulse current: 57A to 298A
- Peak pulse power: 600W
- Package: DO-214AA / SMB (surface mount)
- Operating temperature: -55°C to 150°C minimum
- Diode configuration: Single-channel zener, bidirectional
Substitute parts must maintain the same reverse standoff voltage (5.8V) and package form factor (DO-214AA/SMB) to ensure mechanical and electrical compatibility. Clamping voltage and peak pulse current may vary within acceptable ranges for the application, provided the part remains rated for 600W peak pulse power and operates within the specified temperature range.
Parameter Comparison
| Part Number | Manufacturer | Reverse Standoff (V) | Breakdown Min (V) | Clamping Max (V) | Peak Pulse Current (A) | Peak Pulse Power (W) | Temp Range (°C) | Package | Status |
|---|---|---|---|---|---|---|---|---|---|
| P6SMB6.8C | Littelfuse Inc. | 5.8 | 6.12 | 11.03 | 58.1 | 600 | -55 to 150 | DO-214AA (SMB) | Obsolete |
| P6SMB6.8CA | Taiwan Semiconductor Corporation | 5.8 | 6.46 | 10.5 | 60 | 600 | -55 to 150 | DO-214AA (SMB) | Active |
| SM6T6V8CA | STMicroelectronics | 5.8 | 6.45 | 13.4 | 298 (8/20µs) | 600 | -55 to 150 | DO-214AA (SMB) | Active |
| SM6T6V8CA-E3/52 | Vishay General Semiconductor - Diodes Division | 5.8 | 6.45 | 10.5 | 57 | 600 | -65 to 150 | DO-214AA (SMB) | Active |
| SM6T6V8CA-E3/5B | Vishay General Semiconductor - Diodes Division | 5.8 | 6.45 | 10.5 | 57 | 600 | -65 to 150 | DO-214AA (SMB) | Active |
| SM6T6V8CAY | STMicroelectronics | 5.8 | 6.45 | 13.4 | 298 (8/20µs) | 600 | -55 to 150 | DO-214AA (SMB) | Active |
| SMBJP6KE6.8CA-TP | Micro Commercial Co | 5.8 | 6.45 | 10.5 | 58.1 | 600 | -55 to 175 | DO-214AA (SMB) | Active |
| TVP06B6V8CA-G | Comchip Technology | 5.8 | 6.46 | 10.5 | 57.14 | 600 | -55 to 150 | DO-214AA (SMB) | Active |
Engineering Selection Recommendations
All listed substitute parts are active production components with ROHS3 compliance and RoHS/REACH compliance status, making them suitable for new designs. Selection should be based on the following criteria:
Primary Recommendation: P6SMB6.8CA (Taiwan Semiconductor Corporation) provides the closest electrical match to the P6SMB6.8C with identical reverse standoff voltage, clamping voltage of 10.5V, and peak pulse current of 60A. This part maintains full compatibility with the original design specifications and is in active production with high inventory availability.
Alternative Options: SM6T6V8CA-E3/5B and SM6T6V8CA-E3/52 (Vishay) offer extended operating temperature range (-65°C to 150°C) compared to the original specification, providing additional thermal margin. These parts feature identical clamping voltage (10.5V) and comparable peak pulse current (57A).
High-Current Alternative: SM6T6V8CA and SM6T6V8CAY (STMicroelectronics) provide significantly higher peak pulse current capability (298A at 8/20µs pulse) and clamping voltage (13.4V), suitable for applications requiring enhanced transient suppression performance. SM6T6V8CAY includes automotive-grade qualification (AEC-Q101).
Extended Temperature Option: SMBJP6KE6.8CA-TP (Micro Commercial Co) extends the upper operating temperature to 175°C while maintaining electrical parameters closely aligned with the original part.
Frequently Asked Questions (FAQ)
Q: Can I directly replace P6SMB6.8C with any of these substitute parts?
A: Yes, all listed parts share the same reverse standoff voltage (5.8V), package form factor (DO-214AA/SMB), and peak pulse power rating (600W). Direct mechanical and electrical substitution is possible. Verify that your application can tolerate the specific clamping voltage and peak pulse current of the selected substitute.
Q: What is the difference between clamping voltage variations (10.5V vs 13.4V)?
A: Clamping voltage determines the maximum voltage the TVS diode allows across the protected circuit during a transient event. Lower clamping voltage (10.5V) provides tighter voltage regulation, while higher clamping voltage (13.4V) allows greater voltage excursion. Select based on your circuit's maximum allowable voltage specification.
Q: Why do some parts list different peak pulse current specifications (57A vs 298A)?
A: Peak pulse current capacity depends on the diode's internal design and thermal characteristics. Higher current ratings (298A) indicate greater transient suppression capability. For applications with severe transient environments, higher-rated parts provide additional margin.
Q: Are there temperature range differences I should consider?
A: Yes. The original P6SMB6.8C operates from -55°C to 150°C. Vishay parts (SM6T6V8CA-E3/52, SM6T6V8CA-E3/5B) extend to -65°C, and SMBJP6KE6.8CA-TP extends to 175°C. Select based on your application's actual operating temperature requirements.
Q: Do all substitutes have the same RoHS and REACH compliance?
A: All listed active parts are ROHS3 compliant. REACH status is unaffected for all substitutes, ensuring regulatory compliance for EU and global markets.
Q: What packaging options are available?
A: All parts are supplied in DO-214AA (SMB) surface-mount package. Packaging formats vary (Cut Tape, Tape & Reel, Digi-Reel) depending on manufacturer and supplier, but the component footprint and pinout remain identical.
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