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SMCJ70CA-13 Equivalent & Substitute Parts
Part Overview
The SMCJ70CA-13 is a bidirectional transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated in the SMC (DO-214AB) surface mount package. This component provides transient overvoltage protection with a 70V reverse standoff voltage, 113V maximum clamping voltage, and 1500W peak pulse power rating. The device operates across a temperature range of -55°C to 150°C and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).
Equivalent and substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging formats are required (Cut Tape versus Tape & Reel), or when sourcing from multiple manufacturers is required for supply chain resilience. Substitute parts must maintain electrical equivalence across critical parameters including voltage ratings, clamping characteristics, and peak pulse current specifications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 70 | V |
| Voltage - Breakdown (Min) | 77.8 | V |
| Voltage - Clamping (Max) @ Ipp | 113 | V |
| Current - Peak Pulse (10/1000µs) | 13.3 | A |
| Power - Peak Pulse | 1500 | W |
| Type | Zener | — |
| Bidirectional Channels | 1 | — |
| Mounting Type | Surface Mount | — |
| Package / Case | DO-214AB, SMC | — |
| Operating Temperature Range | -55 to 150 | °C |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitute parts for the SMCJ70CA-13 are classified into two categories based on electrical and mechanical compatibility:
Direct Substitutes (Identical Electrical Specifications)
Direct substitutes maintain all critical electrical parameters: 70V reverse standoff voltage, 77.8V minimum breakdown voltage, 113V maximum clamping voltage, 13.3A peak pulse current, and 1500W peak pulse power. These parts differ only in packaging format (Tape & Reel versus Cut Tape) or manufacturer designation. Direct substitutes include SMCJ70CA-13-F, SMCJ70CA-TP, and SMCJ70CA from Fairchild Semiconductor.
Similar Substitutes (Equivalent Voltage Ratings, Varied Power Handling)
Similar substitutes maintain the core voltage specifications (70V standoff, 113V clamping) but differ in peak pulse current and power dissipation capacity. These include 1.5SMC82CA (13.9A, 1500W), 5.0SMDJ70CA (44.3A, 5000W), 5.0SMDJ70CA-T7 (44.3A, 5000W), SMCJ70CA-TR (69A at 8/20µs, 1500W), and SMDJ70CA (26.6A, 3000W). Similar substitutes are selected when higher transient current handling or power dissipation is required within the same voltage protection window.
Key Parameters Determining Substitution:
- Voltage - Reverse Standoff (Typ): 70V
- Voltage - Clamping (Max) @ Ipp: 113V
- Bidirectional Channels: 1
- Package / Case: DO-214AB, SMC
- Mounting Type: Surface Mount
- RoHS Status: ROHS3 Compliant
Parameter Comparison
| Part Number | Manufacturer | Standoff Voltage (V) | Breakdown Voltage (V) | Clamping Voltage (V) | Peak Pulse Current (A) | Peak Pulse Power (W) | Temp Range (°C) | Packaging |
|---|---|---|---|---|---|---|---|---|
| SMCJ70CA-13 | Diodes Incorporated | 70 | 77.8 | 113 | 13.3 | 1500 | -55 to 150 | Cut Tape |
| SMCJ70CA-13-F | Diodes Incorporated | 70 | 77.8 | 113 | 13.3 | 1500 | -55 to 150 | Tape & Reel |
| SMCJ70CA-TP | Micro Commercial Co | 70 | 77.8 | 113 | 13.3 | 1500 | -55 to 175 | Tape & Reel |
| SMCJ70CA | Fairchild Semiconductor | 70 | 77.8 | 113 | 13.3 | 1500 | -55 to 150 | — |
| 1.5SMC82CA | Taiwan Semiconductor Corporation | 70.1 | 77.9 | 113 | 13.9 | 1500 | -55 to 150 | Tape & Reel |
| 5.0SMDJ70CA | MDE Semiconductor Inc | 70 | 77.8 | 113 | 44.3 | 5000 | -55 to 150 | Tape & Reel |
| 5.0SMDJ70CA-T7 | Littelfuse Inc. | 70 | 77.8 | 113 | 44.3 | 5000 | -65 to 150 | Tape & Reel |
| SMCJ70CA-TR | STMicroelectronics | 70 | 77.8 | 146 | 69 (8/20µs) | 1500 | -55 to 150 | Tape & Reel |
| SMDJ70CA | Alpha & Omega Semiconductor Inc. | 70 | 77.8 | 113 | 26.6 | 3000 | -55 to 150 | Tape & Reel |
Engineering Selection Recommendations
For Direct Replacement (Identical Electrical Performance)
SMCJ70CA-13-F (Diodes Incorporated, Tape & Reel) and SMCJ70CA-TP (Micro Commercial Co, Tape & Reel) are direct electrical equivalents. Selection between these and the original SMCJ70CA-13 depends on packaging requirements. SMCJ70CA-TP offers an extended upper operating temperature of 175°C compared to 150°C for the original part, providing additional thermal margin in high-temperature applications. All direct substitutes maintain RoHS3 compliance and MSL 1 rating.
For Enhanced Transient Protection
When circuit design requires higher transient current handling within the same voltage protection window, SMDJ70CA (Alpha & Omega Semiconductor Inc., 26.6A, 3000W) provides double the peak pulse current and power dissipation. The 5.0SMDJ70CA series (MDE Semiconductor Inc. and Littelfuse Inc.) offers triple the power rating (5000W) with significantly higher peak pulse current (44.3A), suitable for high-energy transient environments. The Littelfuse 5.0SMDJ70CA-T7 variant extends the lower operating temperature to -65°C.
For Alternative Voltage Clamping Characteristics
SMCJ70CA-TR (STMicroelectronics) maintains the 70V standoff voltage but increases the maximum clamping voltage to 146V with substantially higher peak pulse current (69A at 8/20µs pulse width). This variant is selected when circuit topology requires higher clamping voltage tolerance or when protecting against higher-energy transients.
Compliance and Certification
All recommended substitutes maintain RoHS3 compliance and REACH unaffected status. Moisture sensitivity level remains at MSL 1 (unlimited) across all direct substitutes, ensuring equivalent handling and storage requirements.
Frequently Asked Questions (FAQ)
Q: Can SMCJ70CA-13-F be used as a direct replacement for SMCJ70CA-13?
A: Yes. SMCJ70CA-13-F is electrically identical to SMCJ70CA-13, differing only in packaging format (Tape & Reel versus Cut Tape). Both maintain 70V standoff voltage, 113V clamping voltage, 13.3A peak pulse current, and 1500W power rating. The substitution is valid for all circuit applications.
Q: What is the difference between SMCJ70CA-13 and SMDJ70CA?
A: SMDJ70CA maintains the same voltage specifications (70V standoff, 113V clamping) but provides double the peak pulse current (26.6A versus 13.3A) and double the power dissipation (3000W versus 1500W). SMDJ70CA is selected when the circuit experiences higher-energy transient events requiring greater current handling capacity.
Q: Can 5.0SMDJ70CA be substituted for SMCJ70CA-13 in all applications?
A: 5.0SMDJ70CA maintains voltage equivalence (70V standoff, 113V clamping) but provides significantly higher peak pulse current (44.3A) and power rating (5000W). Substitution is valid from an electrical protection standpoint; however, the higher power rating may introduce unnecessary cost and board space considerations in applications requiring only 1500W protection.
Q: What is the significance of the clamping voltage difference in SMCJ70CA-TR?
A: SMCJ70CA-TR increases the maximum clamping voltage from 113V to 146V while maintaining the 70V standoff voltage. This higher clamping voltage is selected when circuit components require greater overvoltage tolerance or when protecting against transients with higher energy content. The 146V clamping characteristic does not affect the 70V protection threshold.
Q: Are all substitute parts RoHS3 compliant?
A: All direct substitutes and similar substitutes listed maintain RoHS3 compliance. Moisture sensitivity level (MSL 1) is consistent across all parts, ensuring equivalent handling, storage, and assembly requirements.
Q: What is the difference between 10/1000µs and 8/20µs pulse width specifications?
A: These represent different transient pulse waveform standards. The 10/1000µs waveform (used by most parts) defines a 10µs rise time and 1000µs decay time. The 8/20µs waveform (used by SMCJ70CA-TR) defines an 8µs rise time and 20µs decay time. Both are valid transient protection standards; selection depends on the specific transient environment and circuit protection requirements.
Q: Can SMCJ70CA from Fairchild Semiconductor be used interchangeably with SMCJ70CA-13 from Diodes Incorporated?
A: Yes. Both parts maintain identical electrical specifications: 70V standoff voltage, 77.8V breakdown voltage, 113V clamping voltage, 13.3A peak pulse current, and 1500W power rating. Operating temperature range is -55°C to 150°C for both. The substitution is valid across all circuit applications.
Q: Why would 1.5SMC82CA be selected over SMCJ70CA-13?
A: 1.5SMC82CA is selected when sourcing from Taiwan Semiconductor Corporation is preferred or when the original part is unavailable. It maintains equivalent voltage specifications (70.1V standoff, 113V clamping) with marginally higher peak pulse current (13.9A versus 13.3A). The difference in current handling is negligible for most applications.
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