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STMicroelectronics SMC50J14CA
- Part No.:
- SMC50J14CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC50J14CA.pdf
- Description:
- Linear IC's
- Quantity:
- Payment:
- Shipping:
Inventory:9,942
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Product details
Overview
SMC50J14CA from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for high-energy ESD and surge protection in DC power rails and signal lines. It features a 14 V standoff voltage (VRM), 23.1 V clamping voltage at 216 A (8/20 µs), 5000 W peak pulse power (10/1000 µs), and operates up to 175 °C junction temperature-ideal for automotive infotainment power inputs and industrial PLC I/O protection.
For engineers reviewing the SMC50J14CA datasheet, SMC50J14CA pinout, SMC50J14CA application, or SMC50J14CA equivalent, key selection criteria include bidirectional clamping behavior, low leakage (0.2 µA at 25 °C), JEDEC-registered SMC package compatibility, and IEC 61000-4-2 (±30 kV contact/air) and IEC 61000-4-4 (4 kV level 4) compliance.
Technical Context
This TVS diode uses planar silicon avalanche technology to deliver precise, repeatable clamping with minimal capacitance drift across temperature. Its bidirectional architecture enables symmetric surge suppression on AC-coupled or floating lines without polarity dependency.
Thermal design is enabled by a 175 °C max operating junction temperature and low thermal resistance (Rth(j-a) ≈ 100 °C/W on standard FR4 footprint), supporting reliable operation in thermally constrained enclosures. Dynamic resistance (RD = 10.2 mΩ) ensures stable voltage clamping under fast-rising transients up to 29 A peak current (10/1000 µs).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 14 V - Maximum continuous reverse working voltage before conduction begins; defines safe operating margin for 12 V nominal systems. |
| Clamping Voltage (VCL) | 23.1 V at 216 A (8/20 µs) - Peak voltage seen by protected circuit during worst-case surge; ensures downstream ICs remain below absolute maximum ratings. |
| Peak Pulse Power | 5000 W (10/1000 µs) - Sustains high-energy surges typical of load dump or inductive switching in automotive/industrial environments. |
| Leakage Current | 0.2 µA at 25 °C - Negligible standby power loss and minimal impact on high-impedance sensor or reference circuits. |
| Junction Temperature Range | −55 °C to +175 °C - Enables deployment in under-hood automotive, motor drive control, and industrial ambient conditions without derating. |
| ESD Rating | ±30 kV (IEC 61000-4-2, contact & air) - Exceeds level 4 requirements, eliminating need for external ESD staging in USB, CAN, or Ethernet interfaces. |
| Package | SMC (DO-214AB) - JEDEC-registered surface-mount outline with 7.75–8.15 mm width, compatible with automated assembly and IPC-7531 footprints. |
Pinout & Package
SMC50J14CA is housed in a 2-terminal SMC (DO-214AB) package with cathode-bar marking indicating polarity orientation. The device has no internal circuitry beyond the bidirectional avalanche junction; both terminals are electrically symmetrical for AC surge suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (marked with bar) | Bidirectional avalanche junction terminal | Marked end denotes cathode for unidirectional variants; for CA (bidirectional), bar indicates orientation only-both terminals function identically under reverse or forward surge. |
| Unmarked Terminal | Complementary avalanche junction terminal | Electrically identical to marked terminal; bidirectional symmetry allows placement without orientation constraints on AC or floating lines. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), or floating power domains without polarity concerns. |
| Low dynamic resistance (10.2 mΩ) | Minimizes clamping voltage rise under high di/dt transients, improving protection margin for fast-edge surges like EFT bursts. |
| High-temperature operation (175 °C) | Eliminates thermal derating in engine-control units, motor drives, and enclosed industrial controllers where ambient exceeds 125 °C. |
| Matte tin lead finish | Ensures solderability and whisker resistance per JESD201 Class 2, supporting long-term reliability in high-vibration or high-humidity deployments. |
| JEDEC-registered SMC outline | Guarantees mechanical compatibility with existing pick-and-place tooling, stencil apertures, and reflow profiles across global EMS providers. |
Applications
| Automotive Infotainment Power Input | Industrial PLC Digital I/O Protection |
|---|---|
|
Use Scenario: 12 V supply line feeding head unit MCU and display driver ICs exposed to load dump and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional TVS clamps positive and negative surges to <23.1 V, preventing latch-up or gate oxide damage in downstream PMICs and LDOs. Use Value: Withstands 5000 W (10/1000 µs) pulses and operates reliably at 175 °C, enabling direct placement near connector entry points without heatsinking. |
Use Scenario: 24 V digital input channel receiving signals from field sensors subject to inductive kickback and lightning-induced surges. IC Role / Device Role / Timing Role: Clamps transients within 1 ns response time, limiting voltage to 23.1 V while diverting >200 A (8/20 µs) away from optocoupler input stage. Use Value: Low 0.2 µA leakage preserves input threshold accuracy; SMC package supports high-density I/O module layouts with IPC-7531-compliant footprint. |
| RS-485 Transceiver Bus Lines | USB Type-C VBUS Line Protection |
|
Use Scenario: Differential data pair (A/B) and common-mode shield in factory automation networks subjected to ESD and EFT. IC Role / Device Role / Timing Role: Bidirectional clamping protects transceiver ESD structures without affecting signal integrity; low capacitance (<100 pF at 0 V) avoids data rate degradation. Use Value: ±30 kV IEC 61000-4-2 rating eliminates need for secondary ESD arrays; symmetrical VBR (15.7–17.3 V) ensures balanced common-mode suppression. |
Use Scenario: VBUS line in portable docking station handling hot-plug events, cable discharge, and adapter surges up to 20 V. IC Role / Device Role / Timing Role: Clamps overvoltage to 23.1 V before USB PD controller or load switch reaches fault threshold, preventing brownout or shutdown. Use Value: 14 V VRM provides 2 V margin above 12 V PD contract, while 5000 W rating covers worst-case 10/1000 µs surges from faulty adapters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ14CA (STMicroelectronics) | Lower peak power (600 W vs. 5000 W), same VRM/VCL, SMB package (smaller footprint, higher thermal resistance). | Suitable for low-energy signal-line protection only; not rated for power rail surges or IEC 61000-4-4 level 4. | Select when space-constrained PCB layout prioritizes size over surge robustness, and threat level is limited to ESD-only. |
| 1.5KE14CA (ON Semiconductor) | Higher leakage (5 µA vs. 0.2 µA), axial DO-201 package, same 14 V VRM but 24.4 V VCL at 205 A (10/1000 µs). | Requires through-hole assembly; less suitable for high-density SMT designs or high-reliability automotive applications due to lead fatigue risk. | Choose for legacy through-hole systems or cost-sensitive industrial controls where SMT compatibility is not required. |
Compared with SMBJ14CA and 1.5KE14CA, SMC50J14CA delivers 8.3× higher surge power handling in an SMT package with 25× lower leakage and guaranteed 175 °C operation-making it the sole option for automotive-grade power rail protection requiring IEC 61000-4-4 level 4 compliance.
Availability
SMC50J14CA is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and USB-C docking stations requiring stable component supply, long-lifecycle support, and full compliance with IEC 61000-4-2/4-4 standards.
Supply support for SMC50J14CA 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 automotive, industrial, and power discrete solutions with vertical manufacturing and broad IP portfolio.
SMC50J TVS series belongs to ST's high-power transient protection product line, engineered specifically for automotive-grade robustness, extended temperature operation, and seamless integration into next-generation EV power electronics and industrial automation systems.
FAQ
What is the difference between SMC50J14A and SMC50J14CA?
SMC50J14A is unidirectional-designed for DC power rails where polarity is fixed-and conducts only in reverse bias above VBR. SMC50J14CA is bidirectional, with symmetrical avalanche breakdown in both directions, making it suitable for AC signals, differential buses, or floating grounds. Both share identical VRM (14 V), VCL, and power ratings, but differ in marking (EBA with/without cathode bar) and application scope.
Does SMC50J14CA require a heatsink in high-power surge scenarios?
No heatsink is required. The device is rated for 175 °C junction temperature and dissipates energy transiently-not continuously. Thermal performance relies on PCB copper area: 1 cm² per pad reduces Rth(j-a) to ~60 °C/W. Standard IPC-7531 SMC footprint (with 1.54 mm pad extensions) provides sufficient thermal mass for 5000 W (10/1000 µs) pulses without exceeding Tj(max).
Can SMC50J14CA be used in parallel to increase surge current handling?
Parallel use is not recommended. Minor VBR mismatches (±0.5 V) cause current imbalance, leading to premature failure of the lower-breakdown unit. For higher current capability, select a higher-rated part (e.g., SMC50J15CA or SMC50J16CA) or verify matched-bin devices with VBR spread <0.1 V-neither of which is offered for this series by ST.
Is SMC50J14CA compliant with AEC-Q200 for automotive use?
SMC50J14CA is not AEC-Q200 qualified. While it meets critical automotive stress requirements-including 175 °C operation, IEC 61000-4-2/4-4, and JEDEC MSL Level 1-it lacks the full qualification test suite (e.g., temperature cycling, board flex, humidity bias). ST offers AEC-Q200-qualified alternatives like SMAJ14CA for safety-critical ECUs, but SMC50J14CA targets non-safety infotainment and body electronics where system-level validation suffices.
SMC50J14CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- SMC50J
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 14V (Max)
- Voltage - Breakdown (Min):
- 15.7V
- Voltage - Clamping (Max) @ Ipp:
- 23.1V
- Current - Peak Pulse (10/1000µs):
- 216A
- 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
SMC50J14CA FAQ
1.How can I place an order for SMC50J14CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC50J14CA 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 SMC50J14CA reliable?
The price and inventory of SMC50J14CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC50J14CA is usually 5 days.
3.What payment methods are accepted for SMC50J14CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC50J14CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC50J14CA?
SMC50J14CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC50J14CA 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 SMC50J14CA?
For technical support, including SMC50J14CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC50J14CA requirements.
6.How does Aetrix verify that SMC50J14CA is sourced from the original manufacturer or authorized distributors?
All SMC50J14CA 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 SMC50J14CA meets industry standards.
7.What is the process for return or replacement of SMC50J14CA?
All SMC50J14CA units undergo pre-shipment inspection (PSI). If there is an issue with SMC50J14CA, 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 SMC50J14CA part is unused and in its original packaging.
Return procedure for SMC50J14CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC50J14CA Tags
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