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SMCJ43CA-M3/9AT Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts
Part Overview
The SMCJ43CA-M3/9AT is a bidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface-mount component operates in the 43V reverse standoff category and provides transient protection for general-purpose applications. The device is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Equivalent and substitute parts are identified based on matching electrical performance parameters and mechanical compatibility within the DO-214AB (SMC) package family.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 43 | V |
| Voltage - Breakdown (Min) | 47.8 | V |
| Voltage - Clamping (Max) @ Ipp | 69.4 | V |
| Current - Peak Pulse (10/1000µs) | 21.6 | A |
| Power - Peak Pulse | 1500 | W |
| Operating Temperature Range | -55 to 150 | °C |
| Mounting Type | Surface Mount | - |
| Package / Case | DO-214AB, SMC | - |
| Type | Zener | - |
| Bidirectional Channels | 1 | - |
Substitute Part Grouping Explanation
Substitute parts for the SMCJ43CA-M3/9AT are classified into three categories based on electrical and mechanical compatibility:
Direct Equivalents maintain identical electrical specifications: 43V reverse standoff, 47.8V minimum breakdown voltage, 69.4V maximum clamping voltage, and 21.6A peak pulse current. These parts are interchangeable without circuit redesign and include SMCJ43CA-E3/57T (Vishay) and SMCJ43CA-13-F (Diodes Incorporated).
Upgrade Alternatives provide the same voltage ratings and clamping characteristics but with slightly higher peak pulse current (21.61A). The SMCJ43CA from Meritek falls into this category, offering equivalent performance with marginal current specification variation.
Higher-Performance Alternatives maintain the core voltage parameters (43V standoff, 69.4V clamping) but deliver increased peak pulse current and power dissipation. These include SMDJ43CA (43.3A, 3000W), SMDJ43CA-T7 (43.2A, 3000W), SMLJ43CA (43.2A, 3000W), SMCJ43CA-TP (21.7A, 1500W), and 5.0SMDJ43CA (72.1A, 5000W). These are suitable for applications requiring higher transient energy absorption.
Substitution eligibility is determined by: (1) matching voltage ratings within specified tolerances, (2) peak pulse current equal to or exceeding the original specification, (3) compatible surface-mount package format, and (4) active product status with current manufacturing availability.
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 | RoHS3 |
|---|---|---|---|---|---|---|---|---|---|
| SMCJ43CA-M3/9AT | Vishay | 43 | 47.8 | 69.4 | 21.6 | 1500 | -55 to 150 | DO-214AB (SMC) | Yes |
| SMCJ43CA-E3/57T | Vishay | 43 | 47.8 | 69.4 | 21.6 | 1500 | -55 to 150 | DO-214AB (SMCJ) | Yes |
| SMCJ43CA-13-F | Diodes Incorporated | 43 | 47.8 | 69.4 | 21.6 | 1500 | -55 to 150 | DO-214AB (SMC) | Yes |
| SMCJ43CA | Meritek | 43 | 47.8 | 69.4 | 21.61 | 1500 | -55 to 150 | DO-214AB (SMC) | Yes |
| SMCJ43CA-TP | Micro Commercial Co | 43 | 47.8 | 69.4 | 21.7 | 1500 | -55 to 175 | DO-214AB (SMC) | Yes |
| SMDJ43CA | Alpha & Omega Semiconductor | 43 | 47.8 | 69.4 | 43.3 | 3000 | -55 to 150 | DO-214AB (SMC) | Yes |
| SMDJ43CA-T7 | Littelfuse | 43 | 47.8 | 69.4 | 43.2 | 3000 | -65 to 150 | DO-214AB (SMCJ) | Yes |
| SMLJ43CA | Bourns | 43 | 47.8 | 69.4 | 43.2 | 3000 | -55 to 150 | DO-214AB (SMC) | Yes |
| 5.0SMDJ43CA | MDE Semiconductor | 43 | 47.8 | 69.4 | 72.1 | 5000 | -55 to 150 | DO-214AB (SMCJ) | Yes |
Engineering Selection Recommendations
Direct Replacement (No Circuit Modification Required): SMCJ43CA-E3/57T and SMCJ43CA-13-F are pin-compatible direct equivalents with identical electrical specifications. Both maintain Active product status and full RoHS3 compliance. Selection between these and the original part depends on supplier availability and lead time requirements.
Equivalent with Extended Temperature Range: SMCJ43CA-TP from Micro Commercial Co extends the upper operating temperature to 175°C (versus 150°C on the original). This part maintains identical voltage and current ratings and is suitable for applications requiring enhanced thermal performance within the same power envelope.
Higher-Performance Substitutes: SMDJ43CA, SMDJ43CA-T7, and SMLJ43CA double the peak pulse current (43.2–43.3A) and power dissipation (3000W), providing enhanced transient protection margin. These are appropriate for circuits experiencing higher energy transients while maintaining the same voltage clamping characteristics. SMDJ43CA-T7 offers extended lower temperature operation (-65°C minimum).
Maximum Protection Alternative: 5.0SMDJ43CA from MDE Semiconductor provides the highest peak pulse current (72.1A) and power rating (5000W) while maintaining identical voltage specifications. This part is selected for applications with severe transient environments or where maximum protection margin is required.
All substitute parts carry Active product status, RoHS3 compliance, and MSL 1 rating, ensuring manufacturing continuity and environmental regulatory compliance.
Frequently Asked Questions (FAQ)
Q: Can SMCJ43CA-E3/57T be used as a direct replacement for SMCJ43CA-M3/9AT? A: Yes. Both parts share identical electrical specifications (43V standoff, 69.4V clamping, 21.6A peak pulse) and DO-214AB package format. The difference is packaging configuration (tape & reel variant) and manufacturer source (both Vishay). No circuit redesign is required.
Q: What is the difference between SMCJ and SMDJ series parts? A: The SMDJ series delivers higher peak pulse current and power dissipation (43.2–43.3A, 3000W) compared to SMCJ series (21.6A, 1500W), while maintaining identical voltage ratings. SMDJ parts are suitable for applications requiring greater transient energy absorption.
Q: Is SMCJ43CA-TP compatible with the original circuit? A: Yes. SMCJ43CA-TP maintains identical voltage and current specifications with an extended upper operating temperature of 175°C. It is a direct functional equivalent suitable for thermal-demanding applications.
Q: Can 5.0SMDJ43CA be used in place of SMCJ43CA-M3/9AT? A: Yes, with design margin improvement. The 5.0SMDJ43CA maintains identical voltage clamping (69.4V) but provides significantly higher peak pulse current (72.1A) and power dissipation (5000W). This is a performance upgrade suitable for high-energy transient environments.
Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts carry RoHS3 compliance certification and MSL 1 moisture sensitivity rating, meeting current environmental and manufacturing standards.
Q: What determines whether a part can substitute for SMCJ43CA-M3/9AT? A: Substitution eligibility requires: (1) matching 43V reverse standoff voltage, (2) matching 69.4V maximum clamping voltage, (3) peak pulse current equal to or exceeding 21.6A, (4) surface-mount DO-214AB package compatibility, and (5) Active product status with current availability.
Q: Can parts with higher peak pulse current ratings be used in existing designs? A: Yes. Higher-rated parts (SMDJ series, 5.0SMDJ series) are backward-compatible substitutes that provide additional protection margin. They maintain the same voltage clamping characteristics and package footprint, requiring no circuit modification.
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