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SMCJ20CA-M3/9AT Equivalent & Substitute Parts
Part Overview
The SMCJ20CA-M3/9AT is a bidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the DO-214AB (SMC) package and provides transient overvoltage protection for general-purpose applications. The part is active and in production, with 659 units currently in stock. Equivalent and substitute parts are identified based on matching electrical characteristics and package compatibility to support procurement flexibility and supply chain continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Voltage - Reverse Standoff (Typ) | 20V |
| Voltage - Breakdown (Min) | 22.2V |
| Voltage - Clamping (Max) @ Ipp | 32.4V |
| Current - Peak Pulse (10/1000µs) | 46.3A |
| Power - Peak Pulse | 1500W |
| Operating Temperature Range | -55°C to 150°C (TJ) |
| Mounting Type | Surface Mount |
| Package / Case | DO-214AB, SMC |
| Type | Zener |
| Bidirectional Channels | 1 |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitute parts for the SMCJ20CA-M3/9AT are classified into two categories based on electrical and mechanical compatibility:
Category 1: Direct Electrical Equivalents (1500W Peak Pulse) These parts maintain identical electrical specifications including 20V reverse standoff voltage, 32.4V clamping voltage, and 46.3A peak pulse current. Substitution is based on matching these core parameters and DO-214AB package compatibility. Packaging format (Tape & Reel, Cut Tape, or Bulk) may vary without affecting electrical performance.
- SMCJ20CA-E3/57T (Vishay, Cut Tape)
- SMCJ20CA (Fairchild Semiconductor, Bulk)
- SMCJ20CA-TP (Micro Commercial Co, Cut Tape)
Category 2: Higher Power Rated Alternatives (3000W–5000W Peak Pulse) These parts share identical voltage specifications (20V standoff, 32.4V clamping) and package format but provide increased peak pulse current capacity and power dissipation. These are manufacturer-recommended alternatives for applications requiring enhanced transient protection margin.
- SMDJ20CA (Alpha & Omega Semiconductor Inc., 92.6A, 3000W)
- SMDJ20CA-T7 (Littelfuse Inc., 92.6A, 3000W)
- SMLJ20CA-TP (Micro Commercial Co, 92.6A, 3000W)
- 5.0SMDJ20CA (MDE Semiconductor Inc., 155A, 5000W)
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Voltage - Reverse Standoff (Typ) | Voltage - Clamping (Max) @ Ipp | Current - Peak Pulse (10/1000µs) | Power - Peak Pulse | Operating Temperature | Package / Case | Packaging Format | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| SMCJ20CA-M3/9AT | Vishay General Semiconductor | 20V | 32.4V | 46.3A | 1500W | -55°C to 150°C | DO-214AB, SMC | Tape & Reel | ROHS3 Compliant |
| SMCJ20CA-E3/57T | Vishay General Semiconductor | 20V | 32.4V | 46.3A | 1500W | -55°C to 150°C | DO-214AB, SMC | Cut Tape | ROHS3 Compliant |
| SMCJ20CA | Fairchild Semiconductor | 20V | 32.4V | 46.3A | 1500W | -55°C to 150°C | DO-214AB, SMC | Bulk | Not specified |
| SMCJ20CA-TP | Micro Commercial Co | 20V | 32.4V | 46.3A | 1500W | -55°C to 175°C | DO-214AB, SMC | Cut Tape | ROHS3 Compliant |
| SMCJ20CA-13-F | Diodes Incorporated | 20V | 32.4V | 46.3A | 1500W | -55°C to 150°C | DO-214AB, SMC | Tape & Reel | ROHS3 Compliant |
| SMDJ20CA | Alpha & Omega Semiconductor Inc. | 20V | 32.4V | 92.6A | 3000W | -55°C to 150°C | DO-214AB, SMC | Tape & Reel | ROHS3 Compliant |
| SMDJ20CA-T7 | Littelfuse Inc. | 20V | 32.4V | 92.6A | 3000W | -65°C to 150°C | DO-214AB, SMC | Tape & Reel | ROHS3 Compliant |
| SMLJ20CA-TP | Micro Commercial Co | 20V | 32.4V | 92.6A | 3000W | -55°C to 175°C | DO-214AB, SMC | Cut Tape | ROHS3 Compliant |
| 5.0SMDJ20CA | MDE Semiconductor Inc | 20V | 32.4V | 155A | 5000W | -55°C to 150°C | DO-214AB, SMC | Tape & Reel | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Equivalents (1500W Category) SMCJ20CA-E3/57T, SMCJ20CA, SMCJ20CA-TP, and SMCJ20CA-13-F are electrically and mechanically equivalent to the SMCJ20CA-M3/9AT. All are active products with ROHS3 compliance. Selection among these parts depends on packaging format availability and procurement requirements. SMCJ20CA-TP offers an extended operating temperature range to 175°C, providing additional thermal margin in high-temperature environments.
Higher Power Alternatives (3000W–5000W Category) SMDJ20CA, SMDJ20CA-T7, SMLJ20CA-TP, and 5.0SMDJ20CA are manufacturer-recommended alternatives that maintain voltage specifications while providing increased peak pulse current and power dissipation capacity. These parts are suitable for applications where the original 1500W specification requires additional transient protection margin. SMDJ20CA-T7 extends the lower operating temperature limit to -65°C. SMLJ20CA-TP and SMCJ20CA-TP both support operation to 175°C. The 5.0SMDJ20CA provides the highest power rating at 5000W with 155A peak pulse current.
All substitute parts listed are active products with ROHS3 compliance and MSL 1 rating, ensuring compatibility with standard manufacturing processes.
Frequently Asked Questions (FAQ)
Q: Can I substitute SMCJ20CA-M3/9AT with SMCJ20CA-E3/57T? A: Yes. Both parts share identical electrical specifications (20V standoff, 32.4V clamping, 46.3A peak pulse, 1500W power) and DO-214AB package. The difference is packaging format: SMCJ20CA-M3/9AT is supplied in Tape & Reel, while SMCJ20CA-E3/57T is supplied in Cut Tape. Electrical performance is equivalent.
Q: What is the difference between SMCJ20CA and SMDJ20CA? A: Both maintain identical voltage ratings (20V standoff, 32.4V clamping). The primary difference is peak pulse current and power dissipation: SMCJ20CA is rated for 46.3A and 1500W, while SMDJ20CA is rated for 92.6A and 3000W. SMDJ20CA provides enhanced transient protection capacity and is suitable for higher-stress applications.
Q: Is SMCJ20CA-TP compatible with the original SMCJ20CA-M3/9AT? A: Yes, electrically and mechanically. SMCJ20CA-TP is supplied in Cut Tape format and offers an extended operating temperature range to 175°C compared to the original part's 150°C maximum. Both use the DO-214AB package and share identical voltage and current specifications.
Q: Can I use 5.0SMDJ20CA as a direct replacement? A: Yes, with consideration for application requirements. The 5.0SMDJ20CA maintains the same voltage specifications but provides significantly higher peak pulse current (155A) and power dissipation (5000W). This part is suitable for applications requiring enhanced transient protection margin. The DO-214AB package and surface mount compatibility remain unchanged.
Q: What does MSL 1 (Unlimited) mean for these parts? A: MSL 1 indicates Moisture Sensitivity Level 1, which means the component has unlimited shelf life without special moisture control measures. All listed substitute parts carry this rating, ensuring standard storage and handling procedures are sufficient.
Q: Are all substitute parts ROHS3 compliant? A: Yes. All substitute parts listed carry ROHS3 compliance certification, ensuring compatibility with regulatory requirements and standard manufacturing processes.
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