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SMBJ43C Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts
Part Overview
The SMBJ43C is a bidirectional transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The component operates with a 43V reverse standoff voltage and provides 600W peak pulse power dissipation in a DO-214AA (SMB) package. The original Littelfuse SMBJ43C is classified as obsolete, necessitating identification of functionally equivalent alternatives from active manufacturers to maintain design continuity and ensure supply chain availability.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 43 | V |
| Voltage - Breakdown (Min) | 45.27 | V |
| Voltage - Clamping (Max) @ Ipp | 72.87 | V |
| Current - Peak Pulse (10/1000µs) | 8.7 | A |
| Power - Peak Pulse | 600 | W |
| Bidirectional Channels | 1 | — |
| Package / Case | DO-214AA, SMB | — |
| Operating Temperature Range | -65 to 150 | °C (TJ) |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the SMBJ43C is determined by strict alignment of the following electrical and mechanical parameters:
- Reverse standoff voltage: 43V (nominal)
- Breakdown voltage minimum: 47.8V or higher
- Clamping voltage maximum: within the range of 69.4V to 76.7V at peak pulse current
- Peak pulse current: 8.2A to 9A (10/1000µs waveform)
- Peak pulse power: 600W minimum
- Package type: DO-214AA (SMB) surface mount
- Bidirectional channels: 1
- RoHS3 compliance required
Substitute parts meeting these criteria are sourced from active manufacturers including MDD, Taiwan Semiconductor Corporation, Micro Commercial Co, Diodes Incorporated, and Vishay General Semiconductor. All listed substitutes maintain functional equivalence within the specified electrical envelope and are available in production quantities.
Parameter Comparison
| Manufacturer | Part Number | Reverse Standoff (V) | Breakdown Min (V) | Clamping Max @ Ipp (V) | Peak Pulse Current (A) | Peak Pulse Power (W) | Operating Temp (°C) | Product Status |
|---|---|---|---|---|---|---|---|---|
| Littelfuse Inc. | SMBJ43C | 43 | 45.27 | 72.87 | 8.7 | 600 | -65 to 150 | Obsolete |
| MDD | SMBJ43CA | 43 | 47.8 | 69.4 | 8.7 | 600 | -50 to 150 | Active |
| Littelfuse Inc. | SZ1SMB43CAT3G | 43 | 47.8 | 69.4 | 8.6 | 600 | -65 to 150 | Active |
| Taiwan Semiconductor Corporation | SMBJ43C | 43 | 47.8 | 76.7 | 8.2 | 600 | -55 to 150 | Active |
| Micro Commercial Co | SMB10J43CA-TP | 43 | 47.8 | 69.4 | 14.41 | 1000 | -55 to 150 | Active |
| Taiwan Semiconductor Corporation | SMBJ43CA R5G | 43 | 47.8 | 69.4 | 9 | 600 | -55 to 150 | Discontinued |
| Diodes Incorporated | SMBJ43CA-13-F | 43 | 47.8 | 69.4 | 8.6 | 600 | -55 to 150 | Active |
| Vishay General Semiconductor | SMBJ43CA-E3/52 | 43 | 47.8 | 69.4 | 8.6 | 600 | -55 to 150 | Active |
| Vishay General Semiconductor | SMBJ43CA-E3/5B | 43 | 47.8 | 69.4 | 8.6 | 600 | -55 to 150 | Active |
Engineering Selection Recommendations
For direct replacement of the obsolete Littelfuse SMBJ43C, the following active alternatives are recommended based on product status and compliance certifications:
Primary Recommendation: MDD SMBJ43CA or Diodes Incorporated SMBJ43CA-13-F. Both parts maintain identical electrical specifications (43V standoff, 69.4V clamping, 8.6-8.7A peak pulse current, 600W power rating) and are in active production with high inventory availability. Both are RoHS3 compliant with MSL 1 rating.
Automotive-Grade Alternative: Littelfuse Inc. SZ1SMB43CAT3G is qualified to AEC-Q101 automotive standards and extends the operating temperature range to -65°C, matching the original part's lower temperature limit. This option is suitable for applications requiring automotive-grade reliability.
Higher Power Capability: Micro Commercial Co SMB10J43CA-TP provides increased peak pulse current (14.41A) and power rating (1000W) while maintaining the 43V standoff voltage and 69.4V clamping voltage. This option accommodates designs requiring enhanced transient energy absorption.
Discontinued Status: Taiwan Semiconductor Corporation SMBJ43CA R5G is marked as discontinued at DiGi Electronics and should not be selected for new designs despite current inventory availability.
Frequently Asked Questions (FAQ)
Q: Can I use SMB10J43CA-TP as a direct replacement for SMBJ43C?
A: Yes, SMB10J43CA-TP is electrically compatible. It maintains the same 43V standoff and 69.4V clamping voltage. The higher peak pulse current (14.41A) and power rating (1000W) provide enhanced protection margin and do not create compatibility issues in standard applications. The DO-214AA (SMB) package is identical.
Q: What is the difference between SMBJ43CA from MDD and SMBJ43CA-13-F from Diodes Incorporated?
A: Both parts share identical electrical specifications: 43V standoff, 47.8V breakdown minimum, 69.4V clamping maximum, and 600W peak pulse power. The primary differences are manufacturer and packaging format (MDD uses standard SMB/DO-214AA; Diodes Incorporated specifies SMB with Tape & Reel packaging). Selection depends on inventory availability and packaging requirements.
Q: Does the Littelfuse SZ1SMB43CAT3G automotive-grade part work in non-automotive applications?
A: Yes. The SZ1SMB43CAT3G meets all electrical requirements for the SMBJ43C and extends the lower operating temperature to -65°C, matching the original specification. AEC-Q101 qualification is a superset of standard reliability requirements and does not restrict use in general-purpose applications.
Q: Why does the Taiwan Semiconductor Corporation SMBJ43C show a higher clamping voltage (76.7V) than other substitutes?
A: The higher clamping voltage (76.7V versus 69.4V) remains within acceptable substitution parameters because it still provides adequate transient suppression at the 43V standoff level. The lower peak pulse current (8.2A) compensates for the higher clamping voltage, maintaining equivalent energy dissipation characteristics. This part is suitable for applications where slightly higher clamping voltage is acceptable.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All listed active substitute parts carry RoHS3 compliance certification. The original Littelfuse SMBJ43C also meets ROHS3 requirements.
Q: What is the significance of MSL 1 (Unlimited) moisture sensitivity level?
A: MSL 1 indicates unlimited shelf life without moisture bake-out requirements. All listed substitutes carry MSL 1 rating, eliminating moisture-related handling constraints and simplifying supply chain logistics.
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