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P6SMB75C Equivalent & Substitute Parts
Part Overview
The P6SMB75C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This part operates with a reverse standoff voltage of 64.1V and provides clamping at 108.15V with a peak pulse current of 5.9A. The P6SMB75C is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Suitable alternatives maintain the same electrical performance envelope while offering active product status and improved availability.
Substiute Parts
Key Parameters
| Parameter | P6SMB75C |
|---|---|
| Voltage - Reverse Standoff (Typ) | 64.1V |
| Voltage - Breakdown (Min) | 67.55V |
| Voltage - Clamping (Max) @ Ipp | 108.15V |
| Current - Peak Pulse (10/1000µs) | 5.9A |
| Power - Peak Pulse | 600W |
| Operating Temperature | -55°C ~ 150°C (TJ) |
| Package / Case | DO-214AA, SMB |
| Type | Zener |
| Bidirectional Channels | 1 |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the P6SMB75C is determined by the following critical electrical and mechanical parameters:
- Voltage - Reverse Standoff (Typ): Must be 64.1V or 64V (±0.1V tolerance acceptable)
- Voltage - Clamping (Max) @ Ipp: Must be within 103V to 108.15V range
- Current - Peak Pulse (10/1000µs): Must be 5.8A or greater
- Power - Peak Pulse: Must be 600W
- Package / Case: Must be DO-214AA or SMB equivalent
- Mounting Type: Must be Surface Mount
- Type: Must be Zener diode
- Bidirectional Channels: Must be 1
Substitute parts are grouped into two categories based on clamping voltage performance:
Group A (103V Clamping): Parts with clamping voltage at 103V, representing the lower end of acceptable performance. These include P6SMB75CA, SMBJ64CA, P6SMB75CA-E3/5B, SMBJ64CAE3/TR13, and SMBJP6KE75CA-TP.
Group B (134V Clamping): SM6T75CAY with higher clamping voltage, suitable for applications requiring additional voltage margin.
Group C (Lower Standoff Voltage): SMBJ58CE3/TR13 with 58V standoff voltage, applicable only where lower voltage protection is acceptable.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (Typ) | Voltage - Clamping (Max) @ Ipp | Current - Peak Pulse (10/1000µs) | Power - Peak Pulse | Operating Temperature | Package / Case | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| P6SMB75C | Littelfuse Inc. | 64.1V | 108.15V | 5.9A | 600W | -55°C ~ 150°C | DO-214AA, SMB | Obsolete | ROHS3 Compliant |
| P6SMB75CA | Eaton - Electronics Division | 64.1V | 103V | 5.9A | 600W | -55°C ~ 150°C | DO-214AA, SMB | Active | RoHS Compliant |
| P6SMB75CA-E3/5B | Vishay General Semiconductor - Diodes Division | 64.1V | 103V | 5.8A | 600W | -65°C ~ 150°C | DO-214AA, SMB | Active | ROHS3 Compliant |
| SMBJ64CA | Meritek | 64V | 103V | 5.83A | 600W | -55°C ~ 150°C | DO-214AA (SMB) | Active | ROHS3 Compliant |
| SMBJ64CAE3/TR13 | Microchip Technology | 64V | 103V | 5.8A | 600W | -65°C ~ 150°C | DO-214AA, SMB | Active | ROHS3 Compliant |
| SMBJP6KE75CA-TP | Micro Commercial Co | 64.1V | 103V | 5.9A | 600W | -55°C ~ 175°C | DO-214AA, SMB | Active | ROHS3 Compliant |
| SM6T75CAY | STMicroelectronics | 64.1V | 134V | 30A (8/20µs) | 600W | -55°C ~ 150°C | DO-214AA, SMB | Active | ROHS3 Compliant |
| SMBJ58CE3/TR13 | Microchip Technology | 58V | 103V | 5.8A | 600W | -65°C ~ 150°C | DO-214AA, SMB | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Substitutes (Recommended for Direct Replacement)
P6SMB75CA (Eaton), P6SMB75CA-E3/5B (Vishay), SMBJ64CA (Meritek), and SMBJ64CAE3/TR13 (Microchip) are the preferred substitutes. All maintain the 64V/64.1V standoff voltage specification and deliver 103V clamping voltage with 5.8A to 5.9A peak pulse current. These parts are active products with ROHS3 compliance and identical DO-214AA/SMB packaging. P6SMB75CA-E3/5B and SMBJ64CAE3/TR13 extend the operating temperature range to -65°C, providing enhanced low-temperature performance.
Extended Temperature Option
SMBJP6KE75CA-TP (Micro Commercial Co) offers the widest operating temperature range (-55°C to 175°C) while maintaining electrical equivalence, suitable for applications requiring elevated temperature operation.
Higher Clamping Voltage Alternative
SM6T75CAY (STMicroelectronics) provides 134V clamping voltage with significantly higher peak pulse current (30A at 8/20µs). This part is appropriate only for applications where increased voltage margin and higher transient current handling are required. AEC-Q101 automotive qualification is available.
Lower Standoff Voltage Option
SMBJ58CE3/TR13 (Microchip) operates at 58V standoff voltage and is suitable only for circuits where lower protection threshold is acceptable. This part is not recommended as a direct replacement for the P6SMB75C in applications requiring 64V protection.
Frequently Asked Questions (FAQ)
Q: Can P6SMB75CA directly replace P6SMB75C?
A: Yes. P6SMB75CA maintains the same 64.1V standoff voltage, 5.9A peak pulse current, and 600W power rating. The clamping voltage is 103V versus 108.15V on the original, representing a 5V reduction within acceptable design margins for most applications. Both use DO-214AA/SMB packaging and are ROHS compliant.
Q: What is the difference between 103V and 108.15V clamping voltage?
A: The P6SMB75C clamps at 108.15V maximum, while most substitutes clamp at 103V. This 5.15V difference affects the peak voltage seen by protected circuitry. Applications with tight voltage margins should evaluate whether 103V clamping is acceptable. SM6T75CAY provides 134V clamping for applications requiring higher voltage tolerance.
Q: Are all substitute parts in the same package?
A: Yes. All substitute parts use DO-214AA or SMB equivalent packaging, suitable for surface-mount assembly on standard PCBs. Mechanical compatibility is maintained across all listed alternatives.
Q: Which substitute offers the best temperature performance?
A: SMBJP6KE75CA-TP operates from -55°C to 175°C, the widest range among substitutes. P6SMB75CA-E3/5B and SMBJ64CAE3/TR13 extend the lower temperature limit to -65°C, beneficial for cold-environment applications.
Q: Is SMBJ58CE3/TR13 a suitable replacement?
A: SMBJ58CE3/TR13 is not recommended as a direct replacement. Its 58V standoff voltage is 6V lower than the P6SMB75C specification. Use this part only in applications where lower protection threshold is intentional and acceptable.
Q: What is the difference between Microchip and Meritek versions?
A: SMBJ64CAE3/TR13 (Microchip) and SMBJ64CA (Meritek) both deliver 103V clamping at 64V standoff. Microchip extends operating temperature to -65°C. Both are active products with full ROHS3 compliance. Selection depends on temperature requirements and supplier availability.
Q: Can SM6T75CAY be used as a drop-in replacement?
A: SM6T75CAY is electrically compatible but not a direct drop-in replacement. Its 134V clamping voltage and 30A peak pulse current (8/20µs) represent higher performance specifications. Use this part only when increased voltage margin and higher transient current handling are required by the application.
Q: Are all substitutes RoHS compliant?
A: Yes. All listed substitute parts carry ROHS3 compliance certification, meeting environmental and regulatory requirements equivalent to the original P6SMB75C.
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