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SMC3K40CA-M3/9A Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts
Part Overview
The SMC3K40CA-M3/9A is a bidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates at 40V reverse standoff voltage with a 64.5V maximum clamping voltage and 46.5A peak pulse current capability. The device is rated for 3000W peak pulse power dissipation and is designed for general-purpose transient protection applications. The part is Active status and ROHS3 compliant with unlimited moisture sensitivity level (MSL 1).
Equivalent and substitute parts are necessary when the original manufacturer part becomes unavailable, when alternative sourcing is required for supply chain optimization, or when design specifications allow for compatible alternatives that meet the same electrical and mechanical requirements.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 40 | V |
| Voltage - Breakdown (Min) | 44.4 | V |
| Voltage - Clamping (Max) @ Ipp | 64.5 | V |
| Current - Peak Pulse (10/1000µs) | 46.5 | A |
| Power - Peak Pulse | 3000 | W |
| Operating Temperature Range | -55 to 150 | °C (TJ) |
| Package / Case | DO-214AB, SMC | - |
| Mounting Type | Surface Mount | - |
| Bidirectional Channels | 1 | - |
| RoHS Status | ROHS3 Compliant | - |
Substitute Part Grouping Explanation
Substitution of TVS diodes is determined by strict equivalence of electrical parameters within defined tolerance bands. The critical parameters that govern substitutability are:
- Voltage - Reverse Standoff (Typ): 40V
- Voltage - Breakdown (Min): 44.4V minimum
- Voltage - Clamping (Max) @ Ipp: 64.5V maximum
- Current - Peak Pulse (10/1000µs): minimum 46.5A for full equivalence
- Power - Peak Pulse: minimum 3000W for full equivalence
- Package / Case: DO-214AB, SMC (surface mount)
- Mounting Type: Surface Mount
- Bidirectional operation: 1 channel
Substitute parts are grouped into two categories based on electrical performance:
Direct Equivalents (Full Electrical Match): Parts meeting or exceeding all electrical parameters of the SMC3K40CA-M3/9A, including 46.5A minimum peak pulse current and 3000W minimum power rating.
Functional Alternatives (Reduced Performance): Parts meeting voltage specifications but with reduced peak pulse current (23.2A to 43.5A) and correspondingly lower power ratings (1500W to 3000W). These are suitable only for applications where the lower current handling capability is acceptable.
Enhanced Performance Alternatives (Upgraded Specifications): Parts exceeding the electrical specifications with higher peak pulse current (77.6A) and power rating (5000W), suitable for applications requiring additional margin.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (V) | Voltage - Breakdown Min (V) | Voltage - Clamping Max (V) | Current - Peak Pulse (A) | Power - Peak Pulse (W) | Operating Temp (°C) | Package | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| SMC3K40CA-M3/9A | Vishay General Semiconductor | 40 | 44.4 | 64.5 | 46.5 | 3000 | -55 to 150 | DO-214AB, SMC | ROHS3 |
| SMDJ40CA | Alpha & Omega Semiconductor Inc. | 40 | 44.4 | 64.5 | 46.6 | 3000 | -55 to 150 | DO-214AB, SMC | ROHS3 |
| SMDJ40CA-T7 | Littelfuse Inc. | 40 | 44.4 | 64.5 | 46.5 | 3000 | -65 to 150 | DO-214AB, SMC | ROHS3 |
| 1SMC40CA TR13 PBFREE | Central Semiconductor Corp | 40 | 44.4 | 64.5 | 23.2 | 1500 | -65 to 150 | DO-214AB, SMC | ROHS3 |
| 3SMC40CA TR13 PBFREE | Central Semiconductor Corp | 40 | 44.4 | 64.5 | 46.4 | 3000 | -65 to 150 | DO-214AB, SMC | ROHS3 |
| 5.0SMDJ40CA | MDE Semiconductor Inc | 40 | 44.4 | 64.5 | 77.6 | 5000 | -55 to 150 | DO-214AB, SMC | ROHS3 |
| 5.0SMDJ40CA-T7 | Littelfuse Inc. | 40 | 44.4 | 64.5 | 77.6 | 5000 | -65 to 150 | DO-214AB, SMC | ROHS3 |
| SM30T47AY | STMicroelectronics | 40 | 44.4 | 64.5 | 43.5 | 3000 | -55 to 175 | DO-214AB, SMC | ROHS3 |
| SM30T47CAY | STMicroelectronics | 40 | 44.4 | 64.5 | 43.5 | 3000 | -55 to 175 | DO-214AB, SMC | ROHS3 |
| SMCJ40CA | MDD | 40 | 44.4 | 64.5 | 23.3 | 1500 | -50 to 150 | DO-214AB, SMC | ROHS3 |
Engineering Selection Recommendations
Direct Equivalents for Pin-Compatible Replacement:
SMDJ40CA (Alpha & Omega Semiconductor Inc.) and SMDJ40CA-T7 (Littelfuse Inc.) are direct electrical equivalents to the SMC3K40CA-M3/9A. Both maintain identical voltage specifications (40V standoff, 44.4V breakdown, 64.5V clamping) and equivalent peak pulse current (46.5A to 46.6A) with 3000W power rating. All three parts are ROHS3 compliant and Active status. SMDJ40CA-T7 offers extended lower operating temperature limit (-65°C vs -55°C), providing additional thermal margin for cold environment applications.
Enhanced Performance Alternatives:
5.0SMDJ40CA (MDE Semiconductor Inc.) and 5.0SMDJ40CA-T7 (Littelfuse Inc.) provide upgraded specifications with 77.6A peak pulse current and 5000W power rating while maintaining identical voltage parameters. These parts are suitable for applications requiring higher transient energy absorption capability. 5.0SMDJ40CA-T7 extends the lower operating temperature to -65°C.
Automotive-Grade Alternative:
SM30T47CAY (STMicroelectronics) meets all voltage specifications with 43.5A peak pulse current and 3000W power rating. This part carries AEC-Q101 automotive qualification and operates across -55°C to 175°C, providing the widest temperature range among available substitutes. The automotive grade designation indicates compliance with automotive reliability standards.
Reduced Performance Alternatives:
1SMC40CA TR13 PBFREE and SMCJ40CA are functional alternatives with reduced peak pulse current (23.2A to 23.3A) and 1500W power rating. These parts maintain voltage equivalence but are suitable only for lower-energy transient protection applications. Both are ROHS3 compliant and Active status.
3SMC40CA TR13 PBFREE (Central Semiconductor Corp) bridges the performance gap with 46.4A peak pulse current and 3000W power rating, matching the original part's power handling while extending the operating temperature range to -65°C.
Frequently Asked Questions (FAQ)
Q: Can SMDJ40CA be used as a direct replacement for SMC3K40CA-M3/9A?
A: Yes. SMDJ40CA meets all electrical specifications with 40V reverse standoff, 44.4V breakdown, 64.5V clamping voltage, and 46.6A peak pulse current at 3000W power rating. Both parts use DO-214AB surface mount packaging and are ROHS3 compliant. The parts are electrically interchangeable.
Q: What is the difference between the 3000W and 5000W rated parts?
A: The 5.0SMDJ40CA and 5.0SMDJ40CA-T7 are rated for 5000W peak pulse power with 77.6A peak pulse current, compared to 3000W and 46.5A for the original SMC3K40CA-M3/9A. The higher power rating provides additional margin for transient energy absorption in high-stress applications. Voltage specifications remain identical across both power classes.
Q: Are the reduced current alternatives (1SMC40CA, SMCJ40CA) suitable for all applications?
A: No. The 1SMC40CA TR13 PBFREE and SMCJ40CA are rated for only 23.2A to 23.3A peak pulse current and 1500W power, compared to 46.5A and 3000W for the original part. These alternatives are suitable only for applications where the lower current handling capability meets the design requirements. Verify transient energy levels before substitution.
Q: What is the advantage of SM30T47CAY over other substitutes?
A: SM30T47CAY carries AEC-Q101 automotive qualification and operates across -55°C to 175°C, the widest temperature range available. This part is suitable for automotive and high-temperature applications. It maintains 40V standoff voltage, 64.5V clamping voltage, and 3000W power rating with 43.5A peak pulse current.
Q: Does operating temperature range affect substitutability?
A: Operating temperature range does not affect electrical substitutability but impacts suitability for specific applications. The original SMC3K40CA-M3/9A operates -55°C to 150°C. Alternatives with extended ranges (such as SMDJ40CA-T7 at -65°C to 150°C or SM30T47CAY at -55°C to 175°C) provide additional margin for temperature-extreme environments but are not required for standard applications within the original temperature range.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All substitute parts listed are ROHS3 compliant and carry Unlimited moisture sensitivity level (MSL 1), matching the original SMC3K40CA-M3/9A specifications.
Q: Can 3SMC40CA TR13 PBFREE replace SMC3K40CA-M3/9A?
A: Yes. 3SMC40CA TR13 PBFREE meets all electrical specifications with 40V standoff, 44.4V breakdown, 64.5V clamping, 46.4A peak pulse current, and 3000W power rating. It extends the lower operating temperature to -65°C and is ROHS3 compliant. The part is electrically equivalent.
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