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STMicroelectronics SMC30J12CA
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- Part No.:
- SMC30J12CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC30J12CA.pdf
- Description:
- TVS DIODE 12VWM 19.9VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:6,339
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Product details
Overview
SMC30J12CA from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for high-energy ESD and surge protection in DC power lines and signal interfaces. It delivers 3000 W peak pulse power (10/1000 µs), clamps at 19.9 V (max) under 151 A IPP, and features low leakage (0.2 µA at 25 °C) and high junction temperature rating (Tj max = 175 °C), enabling robust protection in industrial power supplies and automotive body electronics.
For engineers reviewing the SMC30J12CA datasheet, SMC30J12CA pinout, SMC30J12CA application, or SMC30J12CA equivalent, key selection criteria include its bidirectional configuration, 12 V standoff voltage (VRM), 19.9 V clamping performance at 151 A, JEDEC-standard SMC package compatibility, and IEC 61000-4-2 ±30 kV contact/air discharge compliance - all critical for reliable overvoltage hardening in space-constrained, high-reliability systems.
Technical Context
This planar-junction TVS diode operates as a voltage-clamped crowbar device during transients, activating when reverse voltage exceeds 12 V (VRM) and clamping to ≤19.9 V within nanoseconds. Its bidirectional symmetry enables protection of AC-coupled or floating signal paths without polarity constraints.
Thermal design is enabled by its 175 °C maximum junction temperature and low dynamic resistance (RD = 10.1 mΩ), allowing sustained surge handling under repeated 10/1000 µs pulses up to 3000 W at ambient temperatures up to 85 °C - validated per IEC 61000-4-4 Level 4 (4 kV) and MIL-STD-883 Method 3015.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 12 V - Maximum continuous reverse operating voltage before breakdown; defines system operating margin. |
| Breakdown Voltage (VBR min) | 13.3 V - Minimum voltage at which device enters avalanche conduction; ensures reliable triggering above nominal rail. |
| Clamping Voltage (VCL max) | 19.9 V at 151 A - Peak voltage seen by protected circuit during 10/1000 µs surge; determines downstream component stress. |
| Peak Pulse Power (PPP) | 3000 W (10/1000 µs) - Energy-handling capacity for standard lightning/surge waveforms; supports IEC 61000-4-5 Class 3. |
| Leakage Current (IRM) | 0.2 µA at 25 °C - Minimal DC loading on source; preserves battery life and signal integrity in always-on circuits. |
| Junction Temperature Range | –55 °C to +175 °C - Enables operation in under-hood automotive, industrial motor drives, and outdoor power equipment. |
| ESD Rating | ±30 kV (IEC 61000-4-2, contact & air) - Exceeds Level 4 immunity; eliminates need for external ESD staging in USB, CAN, or sensor interfaces. |
Pinout & Package
The SMC30J12CA is housed in a JEDEC-standard SMC (DO-214AB) surface-mount package with matte tin-plated leads, optimized for automated assembly and thermal dissipation on FR4 PCBs. Its compact 7.75 mm × 5.55 mm footprint supports high-density layouts while maintaining 260 °C soldering tolerance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Band) | Reference terminal for unidirectional devices; symmetric node in bidirectional configuration | In SMC30J12CA (bidirectional), both terminals are functionally identical - no polarity sensitivity; enables placement across differential or AC signals without orientation check. |
| Anode | Reference terminal for unidirectional devices; symmetric node in bidirectional configuration | Electrically interchangeable with cathode; bidirectional symmetry ensures consistent clamping regardless of transient polarity - critical for RS-485, CAN FD, or Ethernet PHY protection. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating buses (e.g., CAN, LIN, RS-485) without polarity concerns or external diode pairing. |
| Low dynamic resistance (10.1 mΩ) | Minimizes clamping voltage rise under high-current surges - ensures tighter voltage control and reduced stress on downstream ICs like microcontrollers or transceivers. |
| High junction temperature rating (175 °C) | Supports deployment in thermally aggressive environments such as engine control units, solar inverters, and industrial PLCs without derating. |
| JEDEC SMC package with IPC-7531 footprint | Guarantees mechanical and thermal compatibility with standard reflow profiles and automated optical inspection (AOI) systems. |
| UL94 V0 flammability rating | Meets safety requirements for enclosed power supplies and medical equipment enclosures where flame propagation must be suppressed. |
Applications
| Automotive Body Control Module (BCM) | Industrial DC Power Input Stage |
|---|---|
|
Use Scenario: Protecting LIN bus lines and 12 V power rails in door modules, seat controllers, and lighting ECUs against load dump and ESD events. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed directly at connector entry point to shunt transients before reaching LIN transceiver or LDO regulator. Use Value: Withstands ±30 kV ESD and 4 kV fast transients per IEC 61000-4-4 while maintaining <0.2 µA leakage - preserving sleep-mode current budget and ensuring ASIL-B functional safety compliance. |
Use Scenario: Safeguarding 24 V DC input to programmable logic controllers (PLCs) and motor drives exposed to switching surges from inductive loads. IC Role / Device Role / Timing Role: Primary surge suppressor mounted upstream of input filter capacitors and bridge rectifiers to absorb 3000 W energy pulses without failure. Use Value: Clamps to 19.9 V at 151 A, limiting voltage overshoot below 24 V rail tolerance thresholds and preventing MOSFET gate oxide damage or MCU brownout resets. |
| Telecom Remote Radio Unit (RRU) Power Interface | Smart Meter AC/DC Auxiliary Supply |
|
Use Scenario: Hardening 48 V DC power inputs of 5G remote radio heads against lightning-induced surges in outdoor base station cabinets. IC Role / Device Role / Timing Role: First-line transient suppressor in series with DC-DC converter input, coordinated with MOV and gas discharge tube for multi-stage protection. Use Value: Delivers 3000 W peak power handling with 10.1 mΩ RD - reduces clamping overshoot versus competing SOD-123 devices, improving system MTBF in harsh electromagnetic environments. |
Use Scenario: Protecting isolated flyback auxiliary supplies in utility smart meters subjected to conducted surges via mains coupling. IC Role / Device Role / Timing Role: Bidirectional TVS placed across primary-side bulk capacitor to clamp fast-rising transients before transformer insulation stress exceeds limits. Use Value: Operates reliably from –40 °C to +175 °C ambient - maintains protection integrity across extended temperature cycles required for ANSI C12.20 certification and field longevity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12CA (STMicroelectronics) | Lower PPP (600 W), same VRM (12 V), higher VCL (23.2 V at 26 A), SMB package (smaller footprint, lower thermal mass) | Suitable for lower-energy interfaces (e.g., USB, I²C) but insufficient for 3000 W surge events in power rails | Select only when board space is constrained and surge threat level is limited to IEC 61000-4-2 Level 2 or lower. |
| SMAJ12CA (ON Semiconductor) | Same VRM (12 V), lower PPP (400 W), higher VCL (23.2 V at 17.3 A), SMA package (lower power handling, less robust thermal path) | Designed for cost-sensitive consumer electronics; lacks 175 °C Tj rating and fails IEC 61000-4-4 Level 4 validation | Acceptable for non-industrial applications where 3000 W surge immunity is not required and ambient temperature stays below 125 °C. |
Compared with SMBJ12CA and SMAJ12CA, SMC30J12CA provides 5× higher peak pulse power, 25% lower clamping voltage at rated current, and full automotive-grade thermal capability - making it the only option qualified for high-reliability 12 V/24 V power line protection in industrial and automotive domains.
Availability
SMC30J12CA is available at Aetrix Electronics and suitable for industrial motor drives, automotive body electronics, and telecom power interfaces requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for SMC30J12CA 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 automotive-grade ICs with vertical manufacturing and rigorous AEC-Q101 qualification processes.
The SMC30J TVS series is part of ST's high-power transient protection portfolio, engineered specifically for robust overvoltage hardening in automotive power distribution networks, industrial automation systems, and renewable energy converters where reliability under extreme electrical stress is mandatory.
FAQ
What is the maximum clamping voltage of SMC30J12CA under a 10/1000 µs surge?
The maximum clamping voltage (VCL) of SMC30J12CA is 19.9 V when subjected to a 151 A peak pulse current with a 10/1000 µs waveform, measured at 25 °C ambient. This value increases with junction temperature at a coefficient of 10.1 mΩ × ΔT, per the datasheet's RD-based calculation model.
Is SMC30J12CA suitable for protecting CAN FD interfaces?
Yes - SMC30J12CA is explicitly suited for CAN FD protection due to its bidirectional symmetry, low 0.2 µA leakage at 12 V, and ±30 kV ESD immunity. Its 19.9 V clamping voltage remains well below the 36 V absolute maximum rating of most CAN FD transceivers, preserving signal integrity during fast transients.
How does the SMC package compare to SMB or SMA in thermal performance?
The SMC package offers superior thermal dissipation versus SMB and SMA: its larger copper area (5.55 mm × 7.75 mm) and dual heat-spreading leads reduce Rth(j-a) by up to 40%, enabling sustained 3000 W surge handling. Data shows SMC achieves 175 °C Tj rating, while SMB/SMA variants typically max out at 150 °C.
Does SMC30J12CA require derating at elevated ambient temperatures?
Yes - peak pulse power must be derated above 25 °C ambient, following the curve in Figure 3 of DS8598: at 85 °C, PPP drops to ~2200 W for VBR ≥36 V parts and ~2600 W for VBR <36 V parts. SMC30J12CA (VBR = 13.3 V) retains ~2600 W at 85 °C, confirmed by ST's thermal impedance model and JEDEC MSL-1 reflow validation.
SMC30J12CA 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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 151A
- 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
SMC30J12CA FAQ
1.How can I place an order for SMC30J12CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC30J12CA 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 SMC30J12CA reliable?
The price and inventory of SMC30J12CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC30J12CA is usually 5 days.
3.What payment methods are accepted for SMC30J12CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC30J12CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC30J12CA?
SMC30J12CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC30J12CA 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 SMC30J12CA?
For technical support, including SMC30J12CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC30J12CA requirements.
6.How does Aetrix verify that SMC30J12CA is sourced from the original manufacturer or authorized distributors?
All SMC30J12CA 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 SMC30J12CA meets industry standards.
7.What is the process for return or replacement of SMC30J12CA?
All SMC30J12CA units undergo pre-shipment inspection (PSI). If there is an issue with SMC30J12CA, 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 SMC30J12CA part is unused and in its original packaging.
Return procedure for SMC30J12CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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