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SMDJ40C Equivalent & Substitute Parts
Part Overview
The SMDJ40C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component operates with a 40V reverse standoff voltage and provides 3000W peak pulse power dissipation in a DO-214AB (SMC) package. The SMDJ40C is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Reverse Standoff Voltage (Typ) | 40V |
| Voltage - Breakdown (Min) | 42.08V |
| Voltage - Clamping (Max) @ Ipp | 67.73V |
| Current - Peak Pulse (10/1000µs) | 46.5A |
| Power - Peak Pulse | 3000W |
| Package / Case | DO-214AB, SMC |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -65°C ~ 150°C (TJ) |
| Type | Zener |
| Bidirectional Channels | 1 |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution of the SMDJ40C is determined by the following critical parameters:
- Reverse standoff voltage of 40V (±tolerance)
- Breakdown voltage minimum of 42.08V or higher
- Clamping voltage maximum of 67.73V or lower
- Peak pulse current capability of 46.5A or higher
- Peak pulse power of 3000W or higher
- DO-214AB (SMC) package compatibility
- Surface-mount configuration
- Operating temperature range encompassing -65°C to 150°C minimum
- Bidirectional, single-channel configuration
- ROHS3 compliance
Substitute parts meeting these electrical and mechanical parameters are functionally equivalent for the SMDJ40C application. Parts with lower peak pulse current or power ratings do not meet the full performance specification but may be acceptable for reduced-stress applications. Parts with higher temperature ratings or enhanced specifications provide additional design margin.
Parameter Comparison
| Part Number | Manufacturer | Reverse Standoff (V) | Breakdown Min (V) | Clamping Max @ Ipp (V) | Peak Pulse Current (A) | Peak Pulse Power (W) | Temp Range (°C) | Product Status |
|---|---|---|---|---|---|---|---|---|
| SMDJ40C | Littelfuse Inc. | 40 | 42.08 | 67.73 | 46.5 | 3000 | -65 ~ 150 | Obsolete |
| SMDJ40CA | Alpha & Omega Semiconductor Inc. | 40 | 44.4 | 64.5 | 46.6 | 3000 | -55 ~ 150 | Active |
| 5.0SMDJ40CA | MDE Semiconductor Inc | 40 | 44.4 | 64.5 | 77.6 | 5000 | -55 ~ 150 | Active |
| 5.0SMLJ40CA-TP | Micro Commercial Co | 40 | 44.4 | 64.5 | 77.6 | 5000 | -55 ~ 175 | Active |
| ATV30C400JB-HF | Comchip Technology | 40 | 44.4 | 64.5 | 46.51 | 3000 | -55 ~ 150 | Active |
| SMCJ40CA | MDD | 40 | 44.4 | 64.5 | 23.3 | 1500 | -50 ~ 150 | Active |
| SMCJ40CAE3/TR13 | Microchip Technology | 40 | 44.4 | 64.5 | 23.2 | 1500 | -65 ~ 150 | Active |
| SMLJ40CA | Bourns Inc. | 40 | 44.4 | 64.5 | 46.4 | 3000 | -55 ~ 150 | Active |
| SMLJ40CA-TP | Micro Commercial Co | 40 | 44.4 | 64.5 | 46.4 | 3000 | -55 ~ 175 | Active |
| SMLJ40CAE3/TR13 | Microchip Technology | 40 | 44.4 | 64.5 | 46.4 | 300 | -55 ~ 150 | Active |
Engineering Selection Recommendations
Full Specification Equivalents (Recommended Primary Substitutes)
SMDJ40CA, SMLJ40CA, SMLJ40CA-TP, and ATV30C400JB-HF provide electrical performance matching or exceeding the SMDJ40C specification with 3000W peak pulse power and 46+ ampere peak pulse current ratings. All are active products with ROHS3 compliance. SMLJ40CA-TP and 5.0SMLJ40CA-TP extend the upper operating temperature to 175°C. ATV30C400JB-HF carries AEC-Q101 automotive qualification for applications requiring automotive-grade components.
Enhanced Performance Alternatives
5.0SMDJ40CA and 5.0SMLJ40CA-TP deliver 5000W peak pulse power with 77.6A peak pulse current, providing increased transient energy absorption capability. These parts are suitable for applications requiring enhanced overvoltage protection margin.
Reduced Performance Alternatives
SMCJ40CA and SMCJ40CAE3/TR13 deliver 1500W peak pulse power with 23+ ampere peak pulse current ratings. These parts are suitable only for applications with reduced transient stress or lower energy requirements. SMCJ40CAE3/TR13 maintains the -65°C lower temperature limit of the original SMDJ40C.
Temperature Considerations
The SMDJ40C specifies -65°C minimum operating temperature. SMCJ40CAE3/TR13 and SMLJ40CAE3/TR13 maintain this lower limit. Most other active substitutes operate to -55°C minimum, which is acceptable for most commercial and industrial applications.
Frequently Asked Questions (FAQ)
Q: Can SMCJ40CA replace SMDJ40C directly?
A: SMCJ40CA is electrically compatible with the same 40V standoff voltage and DO-214AB package. However, it delivers only 1500W peak pulse power versus the 3000W specification of SMDJ40C. Use SMCJ40CA only if your application operates at reduced transient stress levels.
Q: What is the difference between SMLJ and SMCJ series parts?
A: Both series use the DO-214AB (SMC) package and share identical voltage ratings. SMLJ series parts typically deliver higher peak pulse current and power ratings (3000W, 46+ amperes) compared to SMCJ series (1500W, 23 amperes). Select based on your transient energy requirements.
Q: Are 5.0SMDJ40CA and 5.0SMLJ40CA-TP backward compatible with SMDJ40C?
A: Yes. These parts maintain the 40V standoff voltage and DO-214AB package. They provide enhanced performance with 5000W peak pulse power and 77.6A peak pulse current, making them suitable for applications requiring additional protection margin.
Q: Does operating temperature range affect substitution?
A: The SMDJ40C operates -65°C to 150°C. Most active substitutes operate -55°C to 150°C, which is acceptable for commercial and industrial use. If -65°C minimum temperature is required, select SMCJ40CAE3/TR13 or SMLJ40CAE3/TR13.
Q: Is ATV30C400JB-HF suitable for non-automotive applications?
A: Yes. ATV30C400JB-HF meets the same electrical specifications as SMDJ40C and carries AEC-Q101 automotive qualification. It is suitable for any application requiring a 40V TVS diode in DO-214AB package, with the added benefit of automotive-grade reliability.
Q: What does ROHS3 compliance mean for substitution?
A: All listed substitute parts carry ROHS3 compliance, matching the SMDJ40C specification. This ensures compatibility with environmental and regulatory requirements for lead-free, halogen-free component use.
Q: Can I use SMLJ40CA-TP with extended temperature rating (-55°C to 175°C) in place of SMDJ40C?
A: Yes. SMLJ40CA-TP maintains the 40V standoff voltage, 3000W peak pulse power, and DO-214AB package. The extended upper temperature rating to 175°C provides additional design margin for high-temperature applications.
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