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SMBJ78C-E3/5B Equivalent & Substitute Parts
Part Overview
The SMBJ78C-E3/5B is a transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for general-purpose overvoltage protection in surface-mount applications. This part operates with a 78V reverse standoff voltage and provides 139V maximum clamping voltage at peak pulse current. The SMBJ78C-E3/5B is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | SMBJ78C-E3/5B |
| Manufacturer | Vishay General Semiconductor - Diodes Division |
| Category | Transient Voltage Suppressors (TVS) |
| Product Status | Obsolete |
| Type | Zener |
| Voltage - Reverse Standoff (Typ) | 78V |
| Voltage - Breakdown (Min) | 86.7V |
| Voltage - Clamping (Max) @ Ipp | 139V |
| Current - Peak Pulse (10/1000µs) | 4.3A |
| Power - Peak Pulse | 600W |
| Mounting Type | Surface Mount |
| Package / Case | DO-214AA, SMB |
| Operating Temperature | -55°C ~ 150°C (TJ) |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the SMBJ78C-E3/5B is determined by the following critical parameters:
- Voltage - Reverse Standoff (Typ): 78V
- Voltage - Breakdown (Min): 86.7V
- Package / Case: DO-214AA (SMB)
- Mounting Type: Surface Mount
- Bidirectional Channels: 1
- Type: Zener
- RoHS Status: ROHS3 Compliant
Substitute parts must maintain identical reverse standoff voltage, breakdown voltage, and package configuration to ensure functional and mechanical compatibility. Variations in clamping voltage and peak pulse current are permissible within the same voltage class, as these parameters reflect manufacturing tolerance bands and do not affect circuit protection function when operating within the specified voltage window.
Parameter Comparison
| Parameter | SMBJ78C-E3/5B (Main) | SMBJ78CA-E3/5B | SMBJ78CE3/TR13 | SMBJ78CA-13-F |
|---|---|---|---|---|
| Manufacturer | Vishay | Vishay | Microchip | Diodes Inc. |
| Product Status | Obsolete | Active | Active | Active |
| Voltage - Reverse Standoff (Typ) | 78V | 78V | 78V | 78V |
| Voltage - Breakdown (Min) | 86.7V | 86.7V | 86.7V | 86.7V |
| Voltage - Clamping (Max) @ Ipp | 139V | 126V | 139V | 126V |
| Current - Peak Pulse (10/1000µs) | 4.3A | 4.8A | 4.3A | 4.7A |
| Power - Peak Pulse | 600W | 600W | 600W | 600W |
| Package / Case | DO-214AA, SMB | DO-214AA, SMB | DO-214AA, SMB | DO-214AA, SMB |
| Operating Temperature | -55°C ~ 150°C | -55°C ~ 150°C | -65°C ~ 150°C | -55°C ~ 150°C |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
All substitute parts listed maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with standard manufacturing and storage requirements. Selection among active alternatives should prioritize parts with confirmed active product status to ensure long-term availability and supply chain stability.
SMBJ78CA-E3/5B and SMBJ78CA-13-F offer lower clamping voltage (126V) compared to the original specification (139V), resulting in tighter voltage regulation during transient events. SMBJ78CE3/TR13 maintains the original 139V clamping specification and extends the operating temperature range to -65°C, providing enhanced performance in low-temperature environments.
For applications requiring exact electrical performance matching, SMBJ78CE3/TR13 is the direct functional equivalent. For applications where lower clamping voltage is acceptable, SMBJ78CA-E3/5B and SMBJ78CA-13-F provide equivalent protection with improved current handling capacity.
Frequently Asked Questions (FAQ)
Q: Can SMBJ78CA-E3/5B replace SMBJ78C-E3/5B directly?
A: Yes. Both parts share identical reverse standoff voltage (78V), breakdown voltage (86.7V), and DO-214AA package configuration. The clamping voltage difference (126V vs. 139V) falls within the acceptable tolerance band for the 78V voltage class and does not affect circuit protection function.
Q: What is the difference between SMBJ78CA-E3/5B and SMBJ78CE3/TR13?
A: SMBJ78CA-E3/5B is manufactured by Vishay with 126V clamping voltage, while SMBJ78CE3/TR13 is manufactured by Microchip with 139V clamping voltage matching the original part specification. Both are electrically compatible. SMBJ78CE3/TR13 extends the operating temperature range to -65°C.
Q: Are all substitute parts available in the same packaging?
A: Yes. All substitute parts use DO-214AA (SMB) surface-mount packaging, ensuring mechanical and footprint compatibility with the original design.
Q: Does the manufacturer change affect part selection?
A: No. All substitute parts meet identical electrical specifications, RoHS compliance, and moisture sensitivity requirements. Manufacturer selection should be based on supply chain availability and procurement lead times.
Q: Can SMBJ78CA be used as a substitute?
A: Yes. SMBJ78CA (Meritek) maintains the 78V reverse standoff voltage, 86.7V breakdown voltage, and DO-214AA package. The 126V clamping voltage and 4.76A peak pulse current are within the acceptable parameter range for this voltage class.
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