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SMCJ85CA-M3/9AT Equivalent & Substitute Parts
Part Overview
The SMCJ85CA-M3/9AT is a transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This bidirectional Zener diode operates at 85V reverse standoff with a 137V maximum clamping voltage and 10.9A peak pulse current. The device is housed in a DO-214AB (SMC) surface mount package and is designed for general-purpose transient voltage protection applications. With active product status and full RoHS3 compliance, this component remains in production with 1097 units currently in stock. Alternative part numbers and substitute devices are available to address supply chain requirements, design flexibility, or performance optimization needs.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 85 | V |
| Voltage - Breakdown (Min) | 94.4 | V |
| Voltage - Clamping (Max) @ Ipp | 137 | V |
| Current - Peak Pulse (10/1000µs) | 10.9 | A |
| Power - Peak Pulse | 1500 | W |
| Operating Temperature Range | -55 to 150 | °C |
| Package / Case | DO-214AB, SMC | - |
| Mounting Type | Surface Mount | - |
| Type | Zener | - |
| Bidirectional Channels | 1 | - |
| RoHS Status | ROHS3 Compliant | - |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | - |
Substitute Part Grouping Explanation
Substitution eligibility for the SMCJ85CA-M3/9AT is determined by the following critical parameters:
Primary Substitution Criteria:
- Voltage - Reverse Standoff (Typ): 85V
- Voltage - Breakdown (Min): 94.4V
- Voltage - Clamping (Max) @ Ipp: 137V
- Package / Case: DO-214AB, SMC
- Mounting Type: Surface Mount
- Type: Zener
- Bidirectional Channels: 1
Secondary Compatibility Factors:
- Current - Peak Pulse (10/1000µs): 10.9A minimum
- Power - Peak Pulse: 1500W minimum
- Operating Temperature Range: -55°C to 150°C
- RoHS3 Compliance
Substitute parts are grouped into three categories:
Direct Equivalents: Parts with identical voltage ratings, clamping characteristics, and package specifications. These include SMCJ85CA-E3/57T and SMCJ85CA-E3/9AT from Vishay, which maintain the same electrical performance envelope and are pin-compatible replacements.
Upgraded Alternatives: Parts with enhanced current handling or power dissipation capabilities while maintaining the same voltage specifications and package form factor. These include 5.0SMDJ85CA and 5.0SMDJ85CA-T7, which provide 36.5A peak pulse current and 5000W power rating, suitable for applications requiring higher transient energy absorption.
Cross-Manufacturer Equivalents: Parts from alternative manufacturers (Fairchild Semiconductor, Diodes Incorporated, STMicroelectronics, Alpha & Omega Semiconductor) that meet the same electrical and mechanical specifications, enabling supply chain diversification.
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) | Package | Operating Temp (°C) | RoHS3 |
|---|---|---|---|---|---|---|---|---|---|
| SMCJ85CA-M3/9AT | Vishay | 85 | 94.4 | 137 | 10.9 | 1500 | DO-214AB, SMC | -55 to 150 | Yes |
| SMCJ85CA-E3/57T | Vishay | 85 | 94.4 | 137 | 10.9 | 1500 | DO-214AB, SMC | -55 to 150 | Yes |
| SMCJ85CA-E3/9AT | Vishay | 85 | 94.4 | 137 | 10.9 | 1500 | DO-214AB, SMC | -55 to 150 | Yes |
| SMCJ85CA | Fairchild Semiconductor | 85 | 94.4 | 137 | 11 | 1500 | DO-214AB, SMC | -55 to 150 | - |
| 5.0SMDJ85CA | MDE Semiconductor Inc | 85 | 94.4 | 137 | 36.5 | 5000 | DO-214AB, SMC | -55 to 150 | Yes |
| 5.0SMDJ85CA-T7 | Littelfuse Inc. | 85 | 94.4 | 137 | 36.5 | 5000 | DO-214AB, SMC | -65 to 150 | Yes |
| SM15T100CA | STMicroelectronics | 85.5 | 95 | 178 | 56 | 1500 | DO-214AB, SMC | -55 to 150 | Yes |
| SMCJ85CA-13-F | Diodes Incorporated | 85 | 94.4 | 137 | 10.4 | 1500 | DO-214AB, SMC | -55 to 150 | Yes |
| SMCJ85CA-TR | STMicroelectronics | 85 | 94 | 178 | 56 | 1500 | DO-214AB, SMC | -55 to 150 | Yes |
| SMDJ85CA | Alpha & Omega Semiconductor Inc. | 85 | 94.4 | 137 | 21.9 | 3000 | DO-214AB, SMC | -55 to 150 | Yes |
Engineering Selection Recommendations
Direct Replacement (Pin-Compatible, Identical Performance): SMCJ85CA-E3/57T and SMCJ85CA-E3/9AT from Vishay are functionally identical to the SMCJ85CA-M3/9AT. Both maintain the same voltage ratings, current handling, and power dissipation. Selection between these variants depends on packaging format availability (tape & reel specifications). All three are active products with RoHS3 compliance and MSL 1 rating.
Cross-Manufacturer Equivalents (Same Electrical Specifications): SMCJ85CA-13-F (Diodes Incorporated) and SMCJ85CA (Fairchild Semiconductor) provide equivalent electrical performance with 85V standoff voltage, 137V clamping, and 1500W power rating. These enable supply chain flexibility and are suitable for applications where manufacturer diversification is required. Both maintain active product status and RoHS3 compliance.
Enhanced Performance Alternatives (Higher Current/Power Rating): 5.0SMDJ85CA (MDE Semiconductor) and 5.0SMDJ85CA-T7 (Littelfuse) offer 36.5A peak pulse current and 5000W power dissipation while maintaining identical voltage specifications. These are appropriate for applications experiencing higher transient energy levels or requiring additional design margin. Both are RoHS3 compliant with active product status. The 5.0SMDJ85CA-T7 extends the lower operating temperature limit to -65°C.
Higher Clamping Voltage Alternatives: SM15T100CA (STMicroelectronics) and SMCJ85CA-TR (STMicroelectronics) feature 178V maximum clamping voltage with 56A peak pulse current. These are suitable only if circuit design permits higher clamping voltages and the application benefits from enhanced transient suppression capability. Both maintain RoHS3 compliance and active product status.
Intermediate Power Rating Alternative: SMDJ85CA (Alpha & Omega Semiconductor) provides 21.9A peak pulse current and 3000W power rating, positioning it between standard and enhanced performance options. This device is appropriate for moderate transient energy applications and maintains RoHS3 compliance.
Frequently Asked Questions (FAQ)
Q: Can SMCJ85CA-E3/57T replace SMCJ85CA-M3/9AT directly? A: Yes. Both devices share identical voltage ratings (85V standoff, 137V clamping), current specifications (10.9A peak pulse), and power rating (1500W). The difference is in tape & reel packaging format. Electrical performance and pin compatibility are equivalent.
Q: What is the difference between SMCJ85CA variants from Vishay? A: SMCJ85CA-M3/9AT, SMCJ85CA-E3/57T, and SMCJ85CA-E3/9AT are electrically identical. Designations reflect different packaging tape specifications and reel configurations. Selection depends on assembly equipment compatibility and supplier availability.
Q: When should I use 5.0SMDJ85CA instead of SMCJ85CA-M3/9AT? A: Use 5.0SMDJ85CA when your application experiences transient pulses exceeding 10.9A or requires power dissipation beyond 1500W. The 5.0SMDJ series provides 36.5A peak pulse current and 5000W power rating while maintaining the same 85V/137V voltage specifications. This is suitable for higher-energy transient environments such as industrial or telecom applications.
Q: Are all substitute parts RoHS3 compliant? A: Most substitutes listed are RoHS3 compliant. The SMCJ85CA from Fairchild Semiconductor does not specify RoHS3 status in the provided data. Verify compliance documentation with your supplier if regulatory certification is required for your application.
Q: Can I use SM15T100CA as a substitute? A: SM15T100CA is electrically compatible only if your circuit design permits a higher clamping voltage (178V versus 137V). The device maintains the same 85V standoff voltage but clamps at a higher level. Use this substitute only if circuit protection requirements allow higher clamping voltages and you require the enhanced 56A peak pulse current capability.
Q: What is the difference between 5.0SMDJ85CA and 5.0SMDJ85CA-T7? A: Both devices provide identical electrical performance (85V standoff, 137V clamping, 36.5A peak pulse, 5000W power). The 5.0SMDJ85CA-T7 extends the lower operating temperature limit to -65°C compared to -55°C for the standard version. Select the -T7 variant if your application requires operation below -55°C.
Q: Is SMCJ85CA-13-F from Diodes Incorporated a direct replacement? A: Yes. SMCJ85CA-13-F maintains identical voltage ratings, clamping characteristics, and current specifications (10.4A, which is within the 10.9A specification). The device is housed in the same DO-214AB SMC package and is RoHS3 compliant. This part enables cross-manufacturer sourcing.
Q: What packaging formats are available for these TVS diodes? A: All listed parts use the DO-214AB (SMC) surface mount package. Tape & reel packaging specifications vary by manufacturer and part number variant. Confirm tape width, reel size, and quantity per reel with your supplier to ensure compatibility with your assembly equipment.
Q: Can I mix different manufacturers in the same design? A: Yes. All listed substitutes maintain the same electrical specifications and package form factor. However, verify component datasheets for any subtle differences in thermal characteristics, frequency response, or leakage current that may affect circuit performance in your specific application.
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