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STMicroelectronics SMC30J70A
- Part No.:
- SMC30J70A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC30J70A.pdf
- Description:
- DISCRETE
- Quantity:
- Payment:
- Shipping:
Inventory:4,660
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Product details
Overview
SMC30J70A from STMicroelectronics is a unidirectional transient voltage suppression (TVS) diode designed for high-energy surge protection in DC power lines and signal interfaces. It delivers 3000 W peak pulse power (10/1000 μs), clamps at 113 V (max) under 1015 A surge current, and operates up to 175 °C junction temperature - enabling robust protection in industrial power supplies, automotive ECUs, and telecom infrastructure where low leakage (0.2 µA at 25 °C) and high thermal stability are critical.
For engineers reviewing the SMC30J70A datasheet, SMC30J70A pinout, SMC30J70A application, or SMC30J70A equivalent, this device is selected for IEC 61000-4-2 (±30 kV ESD) and IEC 61000-4-4 (4 kV EFT) compliance, high-temperature reliability in constrained PCB layouts, and precise clamping behavior in 70 V nominal DC bus protection.
Technical Context
The SMC30J70A employs planar silicon avalanche technology to achieve fast response (<1 ns), low dynamic resistance (26.5 mΩ), and stable breakdown voltage (77.9–86.1 V) across temperature. Its unidirectional configuration supports anode-to-cathode surge conduction only, with reverse standoff voltage (VRM) of 70 V and guaranteed clamping performance up to 146 A (8/20 μs).
Thermal design is enabled by JEDEC-registered SMC package with 175 °C max junction temperature, 260 °C soldering tolerance, and validated thermal impedance (Zth(j-a)) curves supporting FR4 PCB layout optimization. The device meets J-STD-020 MSL Level 1 and IPC7531 footprint standards without moisture sensitivity concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 3000 W - sustains repeated 1000 μs surges up to 3 kW without degradation |
| Clamping Voltage (VCL) @ IPP = 1015 A | 113 V max - limits downstream voltage stress during 8/20 μs transients |
| Breakdown Voltage (VBR) | 77.9–86.1 V at 1 mA - ensures reliable triggering above 70 V nominal line |
| Leakage Current (IRM) | 0.2 µA at VRM = 70 V, 25 °C - minimizes standby power loss in always-on systems |
| Junction Temperature Range | −55 to +175 °C - supports operation in engine compartments, industrial enclosures, and PoE injectors |
| ESD Withstand (IEC 61000-4-2) | ±30 kV contact & air discharge - exceeds Level 4 for front-panel and connector protection |
| Dynamic Resistance (RD) | 26.5 mΩ - reduces clamping voltage rise under high di/dt surges |
Pinout & Package
SMC30J70A uses the industry-standard SMC (DO-214AB) surface-mount package: 7.75–8.15 mm length × 5.55–6.25 mm width × 2.45 mm height, matte tin-plated leads, JEDEC-compliant outline, and IPC7531 footprint. It has two terminals: Cathode (marked end) and Anode (unmarked end).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked band) | Surge current sink | Connected to protected line; conducts avalanche current to ground during overvoltage |
| Anode | Reference node | Tied to system ground or lower-potential rail; completes conduction path for unidirectional clamping |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature operation | 175 °C max junction temperature enables placement near heat sources (e.g., MOSFETs, inductors) |
| Low clamping ratio | VCL/VBR ≈ 1.45 - tight voltage control preserves margin for downstream 100 V-rated components |
| JEDEC-registered SMC package | Validated thermal and mechanical reliability per MIL-STD-750, method 2026 and JESD22-B102 E3 |
| Ultra-low leakage | 0.2 µA at 70 V, 25 °C - avoids false triggering and battery drain in low-power IoT sensors |
| ESD robustness | ±30 kV IEC 61000-4-2 - eliminates need for secondary ESD stages on USB, RS-485, or CAN interfaces |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) Power Rail |
|---|---|
|
Use Scenario: 24 V DC input stage of DIN-rail mounted PLC power supply exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary unidirectional TVS clamp placed between input fuse and DC-DC converter input capacitor. Use Value: Clamps 113 V peak during 1015 A surge, preventing damage to 100 V-rated input MOSFETs and maintaining >20 V minimum rail during transient. |
Use Scenario: 12 V battery-fed power rail in BCM controlling door locks, lighting, and HVAC actuators. IC Role / Device Role / Timing Role: Standoff protector on main VBAT feed, upstream of LDO regulators and microcontroller power domains. Use Value: Survives 175 °C ambient under hood conditions while limiting leakage to 0.2 µA, avoiding regulator dropout during cold-cranking. |
| Telecom Remote Radio Unit (RRU) DC Feeder | Smart Meter AC/DC Converter Input |
|
Use Scenario: −48 V DC feeder line entering outdoor RRU cabinet, subject to lightning-induced surges and EFT noise. IC Role / Device Role / Timing Role: First-line TVS on DC input before isolation transformer and rectifier stage. Use Value: 3000 W 10/1000 μs rating handles multi-kA induced surges; 26.5 mΩ RD ensures minimal clamping overshoot during fast-rising events. |
Use Scenario: Input stage of switch-mode AC/DC converter in revenue-grade smart meter, operating continuously at 70 °C ambient. IC Role / Device Role / Timing Role: Overvoltage suppressor on bridge rectifier output, protecting bulk capacitor and controller IC. Use Value: Stable 77.9–86.1 V VBR across −40 to +125 °C ensures consistent triggering; 0.2 µA IRM prevents capacitor self-discharge affecting meter calibration drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70A (Bourns) | Lower peak power (600 W), higher clamping voltage (115 V @ 52 A), SMB package (smaller thermal mass) | Limited to sub-1 kA surge environments; unsuitable for IEC 61000-4-4 Level 4 or load dump | Select only when space-constrained and surge energy <100 mJ; verify thermal derating on FR4 |
| 1.5KE70A (ON Semiconductor) | Through-hole DO-201 package, 1500 W rating, 118 V clamping @ 12.7 A, higher leakage (5 µA) | Not suitable for automated SMT assembly; inadequate for 1015 A surge currents | Use only for legacy through-hole designs with lower surge requirements and no reflow constraints |
Compared with SMBJ70A and 1.5KE70A, SMC30J70A provides 5× higher surge current handling, 2× lower dynamic resistance, and guaranteed 175 °C operation - making it the sole choice for high-reliability SMT power rail protection demanding full IEC 61000-4-4/4-2 compliance.
Availability
SMC30J70A is available at Aetrix Electronics and suitable for industrial power supplies, automotive electronic control units, and telecom remote radio units requiring stable component supply, long-term lifecycle support, and traceable sourcing for safety-critical deployments.
Supply support for SMC30J70A 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, designing and manufacturing analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.
The SMC30J TVS series targets high-energy transient protection in compact SMT formats, emphasizing thermal resilience, low leakage, and IEC-compliant clamping for next-generation power conversion and connectivity systems.
FAQ
What is the maximum surge current SMC30J70A can handle without failure?
SMC30J70A is rated for 1015 A peak pulse current under the 8/20 μs waveform per IEC 61000-4-4, with verified clamping at 113 V. It withstands ≥1000 such surges at 25 °C ambient per JEDEC JESD22-A114 test conditions, provided PCB copper area meets recommended footprint (≥3.14 cm² per lead) and thermal relief is optimized.
Does SMC30J70A require derating at elevated ambient temperatures?
Yes - peak pulse power must be derated linearly above 25 °C ambient. At 100 °C board temperature, maximum PPP drops to ~1800 W (per Figure 3 in DS8598 Rev 8). Derating is governed by junction temperature limit (175 °C); use Zth(j-a) curves and copper area data (Figure 12) to calculate safe operating margins.
Can SMC30J70A be used in bidirectional signal line protection?
No - SMC30J70A is unidirectional only. For bidirectional protection (e.g., RS-485, CAN), use SMC30J70CA, which features symmetrical breakdown in both polarities and identical clamping performance (113 V @ 1015 A) but with dual-anode/cathode configuration. Pinout and footprint are identical, but electrical behavior differs fundamentally.
Is SMC30J70A compliant with RoHS and REACH regulations?
Yes - SMC30J70A carries ST's ECOPACK2 qualification, confirming full compliance with RoHS Directive 2011/65/EU (Pb-free, halogen-free) and REACH SVHC thresholds. Matte tin plating meets JESD22-B102 E3 whisker resistance requirements, and packaging adheres to IPC/JEDEC J-STD-020 MSL Level 1.
SMC30J70A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- SMC30J
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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
SMC30J70A FAQ
1.How can I place an order for SMC30J70A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC30J70A 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 SMC30J70A reliable?
The price and inventory of SMC30J70A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC30J70A is usually 5 days.
3.What payment methods are accepted for SMC30J70A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC30J70A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC30J70A?
SMC30J70A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC30J70A 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 SMC30J70A?
For technical support, including SMC30J70A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC30J70A requirements.
6.How does Aetrix verify that SMC30J70A is sourced from the original manufacturer or authorized distributors?
All SMC30J70A 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 SMC30J70A meets industry standards.
7.What is the process for return or replacement of SMC30J70A?
All SMC30J70A units undergo pre-shipment inspection (PSI). If there is an issue with SMC30J70A, 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 SMC30J70A part is unused and in its original packaging.
Return procedure for SMC30J70A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC30J70A Tags
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