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SMBJ78C-E3/52 Equivalent & Substitute Parts
Part Overview
The SMBJ78C-E3/52 is a 78V Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component in DO-214AA (SMB) package is designed for general-purpose transient voltage suppression applications. 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 |
|---|---|
| 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 |
| Operating Temperature Range | -55°C ~ 150°C (TJ) |
| Mounting Type | Surface Mount |
| Package / Case | DO-214AA, SMB |
| Type | Zener |
| Bidirectional Channels | 1 |
Substitute Part Grouping Explanation
Substitution for the SMBJ78C-E3/52 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
- Type: Zener, Bidirectional
- Power - Peak Pulse: 600W
Substitute parts must maintain the same reverse standoff voltage (78V), breakdown voltage (86.7V minimum), and surface mount DO-214AA package to ensure mechanical and electrical compatibility. Variations in clamping voltage and peak pulse current are acceptable within the defined electrical specifications for this product category, provided all other parameters remain within tolerance.
Parameter Comparison
| Parameter | SMBJ78C-E3/52 (Main) | SMBJ78CA-E3/52 | SMBJ78CE3/TR13 | SMBJ78CA-13-F |
|---|---|---|---|---|
| Manufacturer | Vishay | Vishay | Microchip Technology | Diodes Incorporated |
| 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 |
| Operating Temperature Range | -55°C ~ 150°C | -55°C ~ 150°C | -65°C ~ 150°C | -55°C ~ 150°C |
| Package / Case | DO-214AA, SMB | DO-214AA, SMB | DO-214AA, SMB | DO-214AA, SMB |
| Type | Zener | Zener | Zener | Zener |
| Bidirectional Channels | 1 | 1 | 1 | 1 |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Obsolete | Active | Active | Active |
Engineering Selection Recommendations
All listed substitute parts maintain compliance with ROHS3 and REACH requirements. The primary distinction among substitutes is product status:
SMBJ78CA-E3/52, SMBJ78CE3/TR13, and SMBJ78CA-13-F are all active products with current manufacturing support. SMBJ78CA-E3/52 and SMBJ78CE3/TR13 provide the closest electrical match to the original SMBJ78C-E3/52, maintaining the 139V clamping voltage specification. SMBJ78CA-13-F and SMBJ78CA offer alternative clamping characteristics at 126V with higher peak pulse current ratings, suitable for applications where the lower clamping voltage is acceptable.
Selection should prioritize active products to ensure long-term availability and supply chain continuity.
Frequently Asked Questions (FAQ)
Q: Can SMBJ78CA-E3/52 directly replace SMBJ78C-E3/52?
A: Yes. Both parts share identical reverse standoff voltage (78V), breakdown voltage (86.7V), and DO-214AA package. SMBJ78CA-E3/52 is an active product from the same manufacturer, making it a direct functional equivalent.
Q: What is the difference between the 139V and 126V clamping voltage options?
A: The clamping voltage determines the maximum voltage the diode will allow across its terminals during a transient event. SMBJ78C-E3/52 and SMBJ78CE3/TR13 clamp at 139V maximum, while SMBJ78CA-E3/52, SMBJ78CA, and SMBJ78CA-13-F clamp at 126V maximum. Selection depends on the specific transient suppression requirements of the application circuit.
Q: Are all substitute parts in the same DO-214AA package?
A: Yes. All listed substitutes use the DO-214AA (SMB) surface mount package, ensuring mechanical compatibility with existing PCB layouts and assembly processes.
Q: Why is the operating temperature range different for SMBJ78CE3/TR13?
A: SMBJ78CE3/TR13 from Microchip Technology specifies an extended lower temperature limit of -65°C compared to -55°C for other parts. This provides additional thermal margin for applications operating in extreme cold environments.
Q: Are all substitute parts RoHS compliant?
A: Yes. All listed substitutes carry ROHS3 compliance certification, meeting current environmental and regulatory requirements.
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