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STMicroelectronics SMC50J30CA
- Part No.:
- SMC50J30CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC50J30CA.pdf
- Description:
- 5000 W, 30 V TVS IN SMC
- Quantity:
- Payment:
- Shipping:
Inventory:835
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Product details
Overview
SMC50J30CA from STMicroelectronics is a bidirectional 30 V standoff voltage transient voltage suppression (TVS) diode in SMC package, rated for 5000 W peak pulse power (10/1000 µs), 112.6 A peak pulse current, and clamping voltage of 48.4 V at 10/1000 µs - designed to protect Ethernet PHY interfaces, industrial I/O ports, and DC power rails against IEC 61000-4-2 ESD (±30 kV contact/air) and IEC 61000-4-4 EFT (4 kV).
For engineers reviewing the SMC50J30CA datasheet, SMC50J30CA pinout, SMC50J30CA application, or SMC50J30CA equivalent, this device delivers low leakage (0.2 µA at 25 °C), high junction temperature operation (up to +175 °C), JEDEC-registered SMC package compatibility, and verified compliance with UL94 V0, J-STD-020 MSL Level 1, and IEC 61000-4-2 Level 4.
Technical Context
This bidirectional TVS diode uses planar silicon junction technology to achieve symmetrical clamping behavior in both polarities, enabling robust protection of AC-coupled or floating signal lines without polarity dependency. Its dynamic resistance of 43.0 mΩ at 25 °C ensures minimal voltage overshoot during fast transients.
The device operates across -55 °C to +175 °C junction temperature range and maintains stable VBR and VCL performance via temperature coefficient αT = 10 × 10−4/°C, allowing accurate clamping prediction over thermal extremes in automotive and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 30 V - maximum continuous reverse working voltage before breakdown; defines safe operating margin for 24 V DC systems. |
| Breakdown Voltage (VBR) | 33.2–36.8 V at 1 mA - tight tolerance ensures predictable turn-on during surge events without false triggering. |
| Clamping Voltage (VCL) | 48.4 V at 10/1000 µs, 103 A - limits downstream voltage stress to <50 V during 5 kA-class surges. |
| Peak Pulse Power (PPP) | 5000 W (10/1000 µs) - sustains high-energy transients typical of industrial power line coupling and lightning-induced surges. |
| Leakage Current (IR) | 0.2 µA at 25 °C and VRWM - negligible loading on high-impedance sensor or communication lines. |
| Junction Temperature (Tj) | −55 °C to +175 °C - supports under-hood automotive, motor drive control, and high-ambient industrial deployments. |
| ESD Rating | ±30 kV contact & air discharge per IEC 61000-4-2 - exceeds Level 4, eliminating need for external ESD staging in USB, RS-485, and CAN FD interfaces. |
Pinout & Package
SMC50J30CA is housed in a JEDEC-registered SMC (DO-214AB) surface-mount package with matte tin-plated leads, compatible with IPC-7531 footprint and reflow soldering per J-STD-020 MSL Level 1 profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Cathode Bar Absent) | AC terminal (bidirectional) | No cathode marking; symmetric terminals enable polarity-agnostic placement on differential or floating lines. |
| Cathode (Cathode Bar Absent) | AC terminal (bidirectional) | Identical to Anode; device conducts equally in both directions above VBR, simplifying PCB layout. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled signals (e.g., RS-485, CAN FD, audio lines) without polarity constraints. |
| Low dynamic resistance (43.0 mΩ) | Minimizes clamping voltage rise under high di/dt, improving protection margin for fast-rising EFT pulses. |
| High-temperature reliability (Tj max = 175 °C) | Supports long-term operation in enclosed enclosures, motor drives, and automotive engine-control modules. |
| UL94 V0 flammability rating | Ensures flame-retardant housing integrity during sustained overvoltage fault conditions. |
| JEDEC SMC package with MSL Level 1 | Eliminates bake requirements prior to assembly, reducing manufacturing cost and handling complexity. |
Applications
| Industrial Ethernet Port Protection | Automotive Body Control Module (BCM) I/O |
|---|---|
|
Use Scenario: Protecting RJ45 magnetics interface on EtherCAT or PROFINET slave nodes against cable discharge events and induced surges. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential pair (A/B) and shield, clamping common-mode and differential transients simultaneously. Use Value: Maintains signal integrity below 50 V clamping threshold while surviving >30 kV ESD strikes - avoids PHY IC latch-up or damage. |
Use Scenario: Safeguarding LIN bus pins and analog sensor inputs (e.g., ambient temperature, humidity) in BCM units exposed to load dump and jump-start transients. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between signal line and chassis ground, absorbing energy within 1 ns response time. Use Value: 0.2 µA leakage preserves accuracy of 12-bit ADC readings; 175 °C rating ensures reliability near HVAC actuators. |
| DC Power Rail Surge Suppression | Smart Meter Communication Interface |
|
Use Scenario: Secondary-side surge protection on 24 V DC input rail feeding PLC I/O modules subjected to inductive switching noise and lightning-induced surges. IC Role / Device Role / Timing Role: Parallel-connected TVS shunting transient energy to ground before reaching downstream DC-DC converters and microcontrollers. Use Value: 5000 W 10/1000 µs rating handles repetitive 2 kA surges per IEC 61000-4-5; low RD prevents thermal runaway. |
Use Scenario: Protecting optical isolation barrier and RS-485 transceiver in utility smart meters deployed in outdoor substations. IC Role / Device Role / Timing Role: Bidirectional TVS placed on isolated RS-485 bus lines (A/B), referenced to isolated ground plane. Use Value: Symmetrical clamping ensures equal protection during polarity-reversal faults; UL94 V0 compliance meets metering safety certifications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30CA (Bourns) | Same 30 V VRWM, but lower PPP = 600 W (10/1000 µs); higher VCL = 48.4 V at 12.3 A. | Limited to lower-energy surges; unsuitable for IEC 61000-4-4 Level 4 or industrial power-line coupling. | Select only for cost-sensitive consumer-grade designs where 5 kA surge immunity is not required. |
| SMAJ30CA (Littelfuse) | Same VRWM and bidirectional configuration, but SMC package replaced by smaller SMA (DO-214AC); PPP = 400 W. | Lower power handling and thermal mass restrict use to low-duty-cycle signal lines, not power rails. | Prefer when board space is constrained and surge threat level is limited to ESD-only (IEC 61000-4-2). |
Compared with SMC50J30CA, SMBJ30CA and SMAJ30CA offer identical voltage ratings but lack the 5000 W surge capacity, 175 °C junction rating, and low-leakage performance needed for industrial and automotive power interface protection - making SMC50J30CA the only choice for high-reliability, high-energy transient suppression.
Availability
SMC50J30CA is available at Aetrix Electronics and suitable for industrial automation controllers, automotive body electronics, smart grid metering systems, and telecom infrastructure requiring stable component supply with full traceability and long-lifecycle support.
Supply support for SMC50J30CA 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, delivering intelligent power, sensing, and control solutions for automotive, industrial, and consumer markets.
The SMC50J TVS series targets high-reliability transient suppression in harsh environments, emphasizing high-temperature operation, low leakage, and JEDEC-compliant packaging for automated manufacturing and long-term field stability.
FAQ
What is the maximum clamping voltage of SMC50J30CA under an 8/20 µs surge?
The clamping voltage is 64.3 V at 112.6 A for an 8/20 µs waveform, derived from VCL = VBRmax + RD × IPP using RD = 43.0 mΩ and VBRmax = 36.8 V. This value is confirmed in Table 2 of DS13845 Rev 1 and ensures safe operation for 48 V nominal systems during fast-rising surges.
Is SMC50J30CA suitable for protecting CAN FD bus lines?
Yes - its bidirectional architecture, ±30 kV ESD rating, 48.4 V clamping at 10/1000 µs, and low capacitance (<100 pF at 1 MHz) make it ideal for CAN FD physical layer protection. It maintains signal integrity up to 5 Mbps while suppressing EFT bursts and cable discharge events without distorting differential timing.
How does the 175 °C maximum junction temperature impact system design?
The 175 °C Tjmax allows placement near heat sources (e.g., power MOSFETs, transformers) without derating, reduces need for thermal vias or heatsinking, and extends lifetime in sealed enclosures. Thermal impedance data in Figure 11 confirms stable operation under pulsed loads even at elevated ambient temperatures.
Does SMC50J30CA require special PCB layout considerations?
Yes - use the IPC-7531-compliant footprint from Figure 14 (8.19 mm × 5.11 mm pad pitch), minimize trace inductance with short, wide traces to ground, and avoid thermal reliefs on TVS pads to ensure optimal heat dissipation during surge events. The JEDEC SMC outline mandates strict adherence to E2 = 4.4–4.7 mm spacing.
SMC50J30CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- SMC50J
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 30V (Max)
- Voltage - Breakdown (Min):
- 33.2V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 103A
- Power - Peak Pulse:
- 5000W (5kW)
- 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
SMC50J30CA FAQ
1.How can I place an order for SMC50J30CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC50J30CA 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 SMC50J30CA reliable?
The price and inventory of SMC50J30CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC50J30CA is usually 5 days.
3.What payment methods are accepted for SMC50J30CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC50J30CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC50J30CA?
SMC50J30CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC50J30CA 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 SMC50J30CA?
For technical support, including SMC50J30CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC50J30CA requirements.
6.How does Aetrix verify that SMC50J30CA is sourced from the original manufacturer or authorized distributors?
All SMC50J30CA 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 SMC50J30CA meets industry standards.
7.What is the process for return or replacement of SMC50J30CA?
All SMC50J30CA units undergo pre-shipment inspection (PSI). If there is an issue with SMC50J30CA, 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 SMC50J30CA part is unused and in its original packaging.
Return procedure for SMC50J30CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC50J30CA Tags
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