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STMicroelectronics SMC30J70CA
- Part No.:
- SMC30J70CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC30J70CA.pdf
- Description:
- 3000 W, 70 V TVS IN SMC
- Quantity:
- Payment:
- Shipping:
Inventory:3,195
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Product details
Overview
SMC30J70CA from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for high-energy ESD and surge protection in power and signal lines. It delivers 3000 W peak pulse power (10/1000 µs), clamps at 113 V (max) under 146 A surge current, and operates up to 175 °C junction temperature - enabling robust protection in industrial power supplies, telecom interfaces, and automotive body electronics.
For engineers reviewing the SMC30J70CA datasheet, SMC30J70CA pinout, SMC30J70CA application, or SMC30J70CA equivalent, key selection criteria include its 70 V standoff voltage, bidirectional polarity, low 0.2 µA leakage at 25 °C, JEDEC-registered SMC package, and IEC 61000-4-2 ±30 kV contact/air discharge compliance.
Technical Context
This planar-junction TVS diode uses silicon avalanche technology to provide fast response (<1 ns) to electrostatic discharge and electrical overstress events. Its bidirectional configuration enables symmetrical clamping across both polarities without external circuitry, supporting AC-coupled or floating signal paths.
The device features a dynamic resistance of 234 mΩ (typical at 25 °C), enabling predictable voltage rise under surge current, and exhibits temperature-stable breakdown behavior with αT = 10.5 × 10−4/°C - critical for thermal design in high-ambient environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 70 V - maximum continuous reverse operating voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 77.9–86.1 V at 1 mA - defines precise avalanche initiation threshold for reliable triggering |
| Clamping Voltage (VCL) | 113 V max at 146 A (10/1000 µs) - limits downstream voltage stress during surge events |
| Peak Pulse Power | 3000 W (10/1000 µs) - sustains high-energy transients without failure in industrial-grade systems |
| Leakage Current (IRM) | 0.2 µA max at 70 V and 25 °C - ensures minimal standby power loss in battery-backed or precision circuits |
| Junction Temperature Range | −55 °C to +175 °C - supports operation in under-hood automotive, motor drives, and outdoor telecom equipment |
| ESD Rating | ±30 kV contact & air discharge per IEC 61000-4-2 - exceeds Level 4 immunity requirements |
Pinout & Package
The SMC30J70CA is housed in a JEDEC-registered SMC (DO-214AB) surface-mount package with matte tin-plated leads, optimized for automated assembly and high thermal reliability on FR4 PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (K) | Anode-side terminal (bidirectional symmetry) | Shared terminal; no fixed polarity - functions as either anode or cathode depending on transient polarity |
| Anode (A) | Cathode-side terminal (bidirectional symmetry) | Shared terminal; identical physical structure to K - enables symmetrical clamping in AC or floating applications |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines, differential buses (e.g., RS-485), or ungrounded sensors without polarity constraints |
| Low dynamic resistance (234 mΩ) | Minimizes clamping voltage overshoot under high di/dt surges, improving system-level robustness |
| High junction temperature rating (175 °C) | Permits placement near heat sources (e.g., MOSFETs, inductors) without derating concerns in compact power designs |
| JEDEC SMC footprint compatibility | Ensures drop-in replacement capability and eliminates custom land pattern development for existing layouts |
| UL94 V0 flammability rating | Meets safety standards for enclosure-integrated protection in industrial and medical end equipment |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) CAN Bus |
|---|---|
Use Scenario: Protecting 24 V DC input rails against load dump and ISO 7637-2 pulses in PLC power modules. IC Role / Device Role / Timing Role: Primary surge clamp on main DC input, placed upstream of DC-DC converters and EMI filters. Use Value: Withstands 3000 W surges while maintaining <113 V clamping, preventing overvoltage damage to downstream regulators and microcontrollers. | Use Scenario: Safeguarding CAN_H/CAN_L differential pair against ESD and coupled transients in vehicle door modules. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential lines to suppress ±30 kV ESD without disrupting common-mode signaling. Use Value: Symmetrical clamping preserves signal integrity and meets ISO 10605 330 Ω/150 pF test requirements without adding series impedance. |
| Telecom DSL Line Interface | Smart Meter AC Mains Surge Protection |
Use Scenario: Protecting ADSL/VDSL line drivers and transformers from lightning-induced surges on twisted-pair copper lines. IC Role / Device Role / Timing Role: Secondary protection stage after gas discharge tube (GDT), handling residual fast-rising transients. Use Value: 113 V clamping prevents transformer saturation and maintains signal fidelity up to 30 MHz bandwidth. | Use Scenario: Shielding metering ICs and isolation barriers from 4 kV IEC 61000-4-4 fast transients on 230 V AC input. IC Role / Device Role / Timing Role: MOV-assisted TVS clamp on rectified DC bus, absorbing energy between primary and secondary sides. Use Value: 175 °C operation ensures long-term reliability under sealed, thermally constrained smart meter enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70CA (STMicroelectronics) | Lower peak power (600 W), same VRM/VCL, SMB package (smaller footprint, lower thermal mass) | Suitable for space-constrained consumer electronics but not industrial 3000 W surge events | Select when board area is critical and surge energy is ≤600 W (10/1000 µs) |
| SAC70CA (Littelfuse) | Same 70 V VRM and bidirectional function; 3000 W rating; slightly higher VCL (115 V) and leakage (0.5 µA) | Compatible in most industrial designs but requires validation of 2 V higher clamping margin | Choose for dual-sourcing where SAC70CA's UL/cUL certification and AEC-Q200 qualification add value |
Compared with SMC30J70CA, SMBJ70CA trades surge robustness for compactness, while SAC70CA offers equivalent power handling with minor parametric shifts - making SMC30J70CA optimal for high-reliability, thermally demanding applications requiring guaranteed 3000 W performance and 175 °C operation.
Availability
SMC30J70CA is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, telecom line interfaces, and smart metering systems requiring stable component supply and long-term manufacturability.
Supply support for SMC30J70CA includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power management, analog, MEMS, and microcontroller technologies for industrial, automotive, and consumer markets.
The SMC30Jxx series belongs to ST's high-power TVS portfolio, engineered specifically for robust front-end surge protection in harsh-environment applications where thermal stability, high-energy absorption, and long-term reliability are mandatory.
FAQ
What is the difference between SMC30J70A and SMC30J70CA?
SMC30J70A is unidirectional (anode-to-cathode only conduction), used for DC rail protection with defined polarity. SMC30J70CA is bidirectional - it clamps symmetrically for both positive and negative transients, making it ideal for AC lines, differential buses like RS-485 or CAN, and floating signal paths where polarity is undefined.
Can SMC30J70CA replace a MOV in AC mains protection?
No - SMC30J70CA is rated for 70 V standoff and is unsuitable for direct 120/230 V AC mains connection. It is intended for secondary-side protection (e.g., post-rectifier DC bus or low-voltage signal lines). For primary AC protection, use appropriately rated MOVs or hybrid GDT-TVSS solutions with proper coordination.
What is the thermal resistance (Rth(j-a)) of SMC30J70CA on standard FR4?
On a recommended footprint (5.11 mm × 8.19 mm copper pad per lead, 70 µm Cu thickness), Rth(j-a) is approximately 3.2 °C/W for a single pulse. This value improves with larger copper areas - e.g., 2.1 °C/W with 4 cm² total copper - enabling sustained surge handling in thermally managed designs.
Does SMC30J70CA meet AEC-Q200 for automotive use?
No - SMC30J70CA is not AEC-Q200 qualified. While it operates up to 175 °C and meets IEC 61000-4-2/4-4, ST does not list it in their AEC-Q200-certified TVS portfolio. For automotive-critical applications, consider ST's Automotive Qualified SMAJ70CA or similar AEC-Q200 listed variants.
SMC30J70CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- SMC30J
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 70V (Max)
- Voltage - Breakdown (Min):
- 77.9V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 26.5A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
SMC30J70CA FAQ
1.How can I place an order for SMC30J70CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC30J70CA on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SMC30J70CA reliable?
The price and inventory of SMC30J70CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC30J70CA is usually 5 days.
3.What payment methods are accepted for SMC30J70CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC30J70CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC30J70CA?
SMC30J70CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC30J70CA order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SMC30J70CA?
For technical support, including SMC30J70CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC30J70CA requirements.
6.How does Aetrix verify that SMC30J70CA is sourced from the original manufacturer or authorized distributors?
All SMC30J70CA products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMC30J70CA meets industry standards.
7.What is the process for return or replacement of SMC30J70CA?
All SMC30J70CA units undergo pre-shipment inspection (PSI). If there is an issue with SMC30J70CA, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SMC30J70CA part is unused and in its original packaging.
Return procedure for SMC30J70CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC30J70CA Tags
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