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SMBJ70C-E3/5B Equivalent & Substitute Parts
Part Overview
The SMBJ70C-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 70V reverse standoff voltage and 125V maximum clamping voltage, delivering 4.8A peak pulse current in a DO-214AA (SMB) package. The product is currently obsolete, making equivalent substitutes necessary for ongoing design support and component procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | SMBJ70C-E3/5B |
| Manufacturer | Vishay General Semiconductor - Diodes Division |
| Category | Transient Voltage Suppressors (TVS) |
| Package / Case | DO-214AA, SMB |
| Voltage - Reverse Standoff (Typ) | 70V |
| Voltage - Breakdown (Min) | 77.8V |
| Voltage - Clamping (Max) @ Ipp | 125V |
| Current - Peak Pulse (10/1000µs) | 4.8A |
| Power - Peak Pulse | 600W |
| Operating Temperature | -55°C ~ 150°C (TJ) |
| Mounting Type | Surface Mount |
| Type | Zener |
| Bidirectional Channels | 1 |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the SMBJ70C-E3/5B is determined by strict alignment of the following electrical and mechanical parameters:
Critical Matching Parameters:
- Voltage - Reverse Standoff (Typ): 70V
- Voltage - Breakdown (Min): 77.8V
- Package / Case: DO-214AA, SMB
- Mounting Type: Surface Mount
- Type: Zener
- Bidirectional Channels: 1
- Power - Peak Pulse: 600W
- RoHS Status: ROHS3 Compliant
- Moisture Sensitivity Level (MSL): 1 (Unlimited)
Allowable Variation Parameters:
- Voltage - Clamping (Max) @ Ipp: 113V to 146V (within acceptable transient suppression range)
- Current - Peak Pulse (10/1000µs): 4.8A to 27A (higher current capability acceptable for protection margin)
- Operating Temperature: -55°C to -65°C minimum; 150°C to 175°C maximum (extended ranges acceptable)
- Manufacturer: Different manufacturers acceptable if electrical and mechanical specifications align
Substitute parts must maintain the same 70V standoff voltage, 77.8V minimum breakdown voltage, and DO-214AA SMB package to ensure direct PCB compatibility and circuit protection equivalence.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (Typ) | Voltage - Breakdown (Min) | Voltage - Clamping (Max) @ Ipp | Current - Peak Pulse (10/1000µs) | Operating Temperature | Product Status | Package |
|---|---|---|---|---|---|---|---|---|
| SMBJ70C-E3/5B | Vishay General Semiconductor - Diodes Division | 70V | 77.8V | 125V | 4.8A | -55°C ~ 150°C | Obsolete | DO-214AA, SMB |
| SMBJ70CA-E3/5B | Vishay General Semiconductor - Diodes Division | 70V | 77.8V | 113V | 5.3A | -55°C ~ 150°C | Active | DO-214AA, SMB |
| SMBJ70CE3/TR13 | Microchip Technology | 70V | 77.8V | 125V | 4.8A | -65°C ~ 150°C | Active | DO-214AA, SMB |
| SM6T82CAY | STMicroelectronics | 70V | 77.8V | 146V | 27A (8/20µs) | -55°C ~ 150°C | Active | DO-214AA, SMB |
| SMBJ70CA | Semtech Corporation | 70V | 77.8V | 113V | 5.3A | -55°C ~ 175°C | Active | DO-214AA, SMB |
| SMBJ70CA-13-F | Diodes Incorporated | 70V | 77.8V | 113V | 5.3A | -55°C ~ 150°C | Active | DO-214AA, SMB |
| SMBJ70CA-TP | Micro Commercial Co | 70V | 77.8V | 113V | 5.3A | -55°C ~ 175°C | Active | DO-214AA, SMB |
| SMBJ70CA-TR | STMicroelectronics | 70V | 77.8V | 113V | 5.5A | -55°C ~ 150°C | Active | DO-214AA, SMB |
| SMBJ70CAE3/TR13 | Microchip Technology | 70V | 77.8V | 113V | 5.3A | -65°C ~ 150°C | Active | DO-214AA, SMB |
Engineering Selection Recommendations
Primary Substitutes (Highest Compatibility):
SMBJ70CA-E3/5B and SMBJ70CE3/TR13 are direct functional equivalents. Both maintain identical standoff and breakdown voltages with active product status. SMBJ70CA-E3/5B is manufactured by the original supplier (Vishay), ensuring design continuity. SMBJ70CE3/TR13 (Microchip) offers extended lower temperature rating (-65°C minimum) and is actively produced.
Secondary Substitutes (Acceptable with Electrical Equivalence):
SMBJ70CA (Semtech), SMBJ70CA-13-F (Diodes Incorporated), SMBJ70CA-TP (Micro Commercial Co), and SMBJ70CA-TR (STMicroelectronics) all meet the critical 70V standoff and 77.8V breakdown specifications. These parts feature 113V clamping voltage (12V lower than original) and 5.3A to 5.5A peak pulse current (higher than original 4.8A). The reduced clamping voltage provides tighter transient suppression; the increased current capability offers additional protection margin. SMBJ70CA-TP and SMBJ70CA (Semtech) support extended operating temperature to 175°C. All are ROHS3 compliant with MSL 1 rating.
SMBJ70CAE3/TR13 (Microchip) combines the secondary electrical profile (113V clamping, 5.3A) with extended lower temperature rating (-65°C minimum).
Alternative with Enhanced Performance:
SM6T82CAY (STMicroelectronics) maintains the 70V standoff and 77.8V breakdown specifications but delivers significantly higher peak pulse current (27A at 8/20µs pulse) and 146V clamping voltage. This part is AEC-Q101 qualified for automotive applications. Use this substitute only when higher transient energy absorption is required or when automotive-grade qualification is mandated.
All substitute parts are ROHS3 compliant and carry MSL 1 (unlimited moisture sensitivity), matching the original specification.
Frequently Asked Questions (FAQ)
Q: Can SMBJ70CA-E3/5B replace SMBJ70C-E3/5B directly on the PCB?
A: Yes. Both parts share identical 70V reverse standoff voltage, 77.8V minimum breakdown voltage, and DO-214AA SMB package. SMBJ70CA-E3/5B is manufactured by Vishay and maintains the same thermal and electrical operating range (-55°C to 150°C). The 12V reduction in clamping voltage (125V to 113V) provides tighter transient suppression without affecting circuit compatibility.
Q: What is the difference between 125V and 113V clamping voltage?
A: Clamping voltage is the maximum voltage the TVS diode allows across its terminals during a transient event. The original SMBJ70C-E3/5B clamps at 125V maximum; substitute parts with 113V clamping provide 12V lower peak voltage suppression. This tighter clamping offers enhanced protection for sensitive downstream components. Both values are within acceptable transient suppression ranges for 70V standoff applications.
Q: Why do some substitutes have higher peak pulse current (5.3A or 5.5A vs. 4.8A)?
A: Higher peak pulse current indicates greater transient energy absorption capability. Substitutes with 5.3A or 5.5A ratings provide additional protection margin without affecting circuit operation. The higher current rating is a performance enhancement, not a compatibility issue. All parts maintain the same 600W peak pulse power rating.
Q: Is SM6T82CAY a suitable substitute?
A: SM6T82CAY is electrically compatible (70V standoff, 77.8V breakdown, DO-214AA SMB package) but delivers significantly higher performance: 27A peak pulse current and 146V clamping voltage. Use this part only when enhanced transient suppression is required or when AEC-Q101 automotive qualification is mandated. For standard applications matching the original 4.8A specification, SMBJ70CA-E3/5B or SMBJ70CE3/TR13 are preferred.
Q: What does the packaging designation (E3/5B, TR, TP, CT) mean?
A: Packaging designations indicate tape format and reel configuration for automated assembly. E3/5B, TR (Tape & Reel), TP (Cut Tape & Digi-Reel), and CT (Cut Tape) are different distribution formats of the same electrical component. Selection depends on your assembly process and procurement volume. All formats deliver identical electrical performance.
Q: Can I use SMBJ70CA-TP or SMBJ70CA-TR interchangeably?
A: Yes, from an electrical and functional standpoint. Both are SMBJ70CA variants with identical 70V standoff, 77.8V breakdown, 113V clamping, and 5.3A to 5.5A peak pulse specifications. The difference is packaging format: TP is cut tape with Digi-Reel, TR is standard tape and reel. Choose based on your assembly equipment and procurement requirements.
Q: Does operating temperature range affect substitution?
A: Operating temperature range affects application suitability but not electrical substitution. The original SMBJ70C-E3/5B operates -55°C to 150°C. Substitutes with extended ranges (-65°C minimum or 175°C maximum) are acceptable and provide additional thermal margin. If your circuit operates within -55°C to 150°C, any substitute with this range or broader is compatible.
Q: Are all substitutes ROHS3 compliant?
A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (unlimited moisture sensitivity), matching the original specification. This ensures environmental and regulatory compatibility across all alternatives.
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