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SMBJ78CA-13 Equivalent & Substitute Parts
Part Overview
The SMBJ78CA-13 is a transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 78V reverse standoff voltage with 126V maximum clamping voltage and 4.7A peak pulse current capability in a DO-214AA (SMB) package. The part is currently discontinued at DiGi Electronics, making equivalent substitutes 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 | 126V |
| Current - Peak Pulse (10/1000µs) | 4.7A |
| Power - Peak Pulse | 600W |
| Package / Case | DO-214AA, SMB |
| Operating Temperature Range | -55°C ~ 150°C (TJ) |
| Type | Zener |
| Bidirectional Channels | 1 |
| Mounting Type | Surface Mount |
Substitute Part Grouping Explanation
Substitution eligibility for the SMBJ78CA-13 is determined by strict equivalence across the following critical parameters:
- Voltage - Reverse Standoff: 78V (±tolerance as specified by manufacturer)
- Voltage - Clamping (Max) @ Ipp: 126V
- Current - Peak Pulse (10/1000µs): 4.7A minimum
- Power - Peak Pulse: 600W
- Package / Case: DO-214AA (SMB)
- Type: Zener, Bidirectional, 1 Channel
- Mounting Type: Surface Mount
All identified substitutes maintain these electrical specifications within acceptable engineering tolerances. Packaging format (Tape & Reel vs. bulk) and manufacturer compliance certifications (RoHS, REACH) are secondary considerations that do not affect electrical interchangeability.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (Typ) | Voltage - Breakdown (Min) | Voltage - Clamping (Max) @ Ipp | Current - Peak Pulse (10/1000µs) | Power - Peak Pulse | Operating Temperature | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| SMBJ78CA-13 | Diodes Incorporated | 78V | 86.7V | 126V | 4.7A | 600W | -55°C ~ 150°C | Discontinued | RoHS non-compliant |
| SMBJ78CA-13-F | Diodes Incorporated | 78V | 86.7V | 126V | 4.7A | 600W | -55°C ~ 150°C | Active | ROHS3 Compliant |
| SMBJ78CA | Meritek | 78V | 86.7V | 126V | 4.76A | 600W | -55°C ~ 150°C | Active | ROHS3 Compliant |
| SMBJ78CA-TP | Micro Commercial Co | 78V | 86.7V | 126V | 4.7A | 600W | -55°C ~ 175°C | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Substitute: SMBJ78CA-13-F (Diodes Incorporated)
This part is the direct equivalent from the original manufacturer with identical electrical specifications and active product status. It is ROHS3 compliant and available in Tape & Reel packaging. Selection of this substitute maintains design continuity with the original component specification.
Secondary Substitutes: SMBJ78CA (Meritek) and SMBJ78CA-TP (Micro Commercial Co)
Both alternatives meet the core electrical requirements with active product status and ROHS3 compliance. The Meritek variant provides 4.76A peak pulse current, exceeding the 4.7A specification. The Micro Commercial Co variant extends the operating temperature range to -55°C ~ 175°C, providing additional thermal margin. Both are suitable for direct replacement in the DO-214AA (SMB) package footprint.
Frequently Asked Questions (FAQ)
Q: Can SMBJ78CA-13-F be used as a direct replacement for SMBJ78CA-13?
A: Yes. SMBJ78CA-13-F is electrically identical to SMBJ78CA-13 with matching voltage, current, and power specifications. The primary difference is product status (active vs. discontinued) and RoHS compliance certification.
Q: What is the difference between Tape & Reel and bulk packaging?
A: Tape & Reel packaging is suitable for automated assembly processes, while bulk packaging is used for manual or alternative assembly methods. Both formats contain identical components with no electrical differences.
Q: Does the Meritek SMBJ78CA variant meet the 4.7A requirement?
A: Yes. The Meritek part specifies 4.76A peak pulse current, which exceeds the 4.7A minimum requirement and is within acceptable engineering tolerance for this component class.
Q: Is the extended temperature range of SMBJ78CA-TP (-55°C ~ 175°C) a concern?
A: No. An extended operating temperature range is a superset of the original specification (-55°C ~ 150°C) and does not create compatibility issues. This provides additional thermal margin for applications requiring higher junction temperatures.
Q: Are all substitutes compatible with the same PCB footprint?
A: Yes. All substitute parts use the DO-214AA (SMB) package, ensuring mechanical and electrical compatibility with the original SMBJ78CA-13 footprint.
Q: What compliance certifications should I verify for my application?
A: All active substitutes are ROHS3 compliant and REACH unaffected. Verify these certifications match your design requirements before final component selection.
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