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STMicroelectronics SMC50J22CA
- Part No.:
- SMC50J22CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC50J22CA.pdf
- Description:
- Linear IC's
- Quantity:
- Payment:
- Shipping:
Inventory:3,663
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Product details
Overview
SMC50J22CA from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for high-energy surge protection in DC power lines and signal interfaces. It delivers 5000 W peak pulse power (10/1000 μs), clamps at 35.5 V (max) under 141 A IPP, and operates up to 175 °C junction temperature - enabling robust protection in industrial motor drives, telecom power supplies, and automotive body control modules.
For engineers reviewing the SMC50J22CA datasheet, SMC50J22CA pinout, SMC50J22CA application, or SMC50J22CA equivalent, key selection criteria include its bidirectional configuration, 22 V standoff voltage (VRM), low 0.2 µA leakage at 25 °C, IEC 61000-4-2 ±30 kV ESD immunity, and JEDEC-standard SMC package compatibility with automated assembly.
Technical Context
This planar-junction TVS diode uses silicon avalanche technology to provide fast response (<1 ns) to transients while maintaining low dynamic resistance (9.6 mΩ typical) and stable clamping performance across temperature. Its bidirectional symmetry ensures identical protection for positive and negative surges without polarity dependency.
The device complies with IEC 61000-4-4 Level 4 (4 kV), exceeds IEC 61000-4-2 Level 4 (±30 kV contact/air), and supports high-reliability operation via 175 °C max junction temperature rating and matte tin lead finish meeting JESD 22-B102 E3 and IPC 7531 footprint standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 22 V - maximum continuous reverse operating voltage before clamping begins |
| Breakdown Voltage (VBR min) | 24.4 V at 1 mA - guaranteed avalanche initiation threshold for reliable triggering |
| Clamping Voltage (VCL max) | 35.5 V at 141 A (10/1000 μs) - limits downstream voltage stress during surge events |
| Peak Pulse Power (PPP) | 5000 W (10/1000 μs) - sustains high-energy transients common in industrial power rails |
| Leakage Current (IRM) | 0.2 µA at 22 V and 25 °C - minimizes standby power loss in battery-backed or low-power systems |
| Junction Temperature Range | –55 °C to +175 °C - enables deployment in under-hood automotive or high-ambient industrial environments |
| ESD Rating | ±30 kV per IEC 61000-4-2 (contact & air) - exceeds Level 4 for system-level ESD robustness |
Pinout & Package
SMC50J22CA is housed in a JEDEC-standard SMC (DO-214AB) surface-mount package with two terminals: Cathode (marked with cathode bar) and Anode. The package features matte tin-plated leads, 264 mg unit weight, and is optimized for reflow soldering per J-STD-020 MSL Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (K) | Surge current sink terminal | Marked with cathode bar; connects to protected line in bidirectional configuration - serves as common reference for both polarities |
| Anode (A) | Surge current source terminal | Unmarked terminal; completes bidirectional conduction path - enables symmetrical clamping for ± transients |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional surge protection | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| Low dynamic resistance (RD) | 9.6 mΩ typical - reduces clamping voltage rise under high-current surges for tighter voltage limiting |
| High-temperature operation | Rated to 175 °C junction temperature - supports reliability in thermally constrained enclosures or near heat sources |
| JEDEC-compliant SMC footprint | Ensures drop-in compatibility with existing PCB layouts and automated placement equipment |
| UL94 V0 flammability rating | Confirms polymer housing meets stringent fire-safety requirements for end-equipment certifications |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
|
Use Scenario: Protection of 24 V DC bus against inductive switching spikes and lightning-induced surges in variable-frequency drives. IC Role / Device Role / Timing Role: Bidirectional TVS diode placed across input terminals to clamp transients within safe MOSFET gate-source and bulk capacitor ratings. Use Value: Prevents repeated overvoltage failures in IGBT gate drivers by limiting clamping voltage to 35.5 V at 141 A, preserving system uptime. |
Use Scenario: Input-stage surge protection for 48 V telecom rectifiers exposed to long-line induced surges and ESD during hot-swap operations. IC Role / Device Role / Timing Role: Primary transient suppressor on DC input rail, coordinated with upstream MOVs and downstream LC filters. Use Value: Withstands 5000 W (10/1000 μs) pulses and ±30 kV ESD, reducing field return rates in outdoor base station power units. |
| Automotive Body Control Modules | Industrial PLC I/O Terminals |
|
Use Scenario: Protection of LIN/CAN transceiver power pins and sensor supply lines in BCMs subjected to load-dump and jump-start conditions. IC Role / Device Role / Timing Role: Secondary clamping device after primary TVS or polyfuse, absorbing residual energy not diverted upstream. Use Value: Operates reliably at 175 °C ambient, ensuring protection integrity in engine-compartment-adjacent mounting locations. |
Use Scenario: Field-side surge protection on 24 V digital input modules connected to solenoids, limit switches, and proximity sensors. IC Role / Device Role / Timing Role: Fast-acting bidirectional clamp placed directly at connector entry point to shunt transient energy before reaching optocouplers. Use Value: Low 0.2 µA leakage prevents false triggering of high-impedance inputs, maintaining signal integrity in noisy factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22CA (STMicroelectronics) | Lower PPP (600 W), same VRM (22 V), SMB package (smaller footprint, lower thermal mass) | Suitable for space-constrained consumer electronics; insufficient for 5000 W industrial surges | Select only when surge energy is ≤600 W and board area is critical |
| SAC22CA (Littelfuse) | Same VRM (22 V), 5000 W rating, but higher VCL (38.9 V @ 141 A) and 10.2 mΩ RD | Acceptable where 3.4 V higher clamping voltage is tolerable in downstream circuitry | Prefer when sourcing diversity is required and 35.5 V clamping margin is non-negotiable |
Compared with SMBJ22CA and SAC22CA, SMC50J22CA uniquely balances 5000 W surge handling, 35.5 V clamping, and SMC thermal robustness - making it optimal for industrial-grade 24 V systems where both energy absorption and voltage limiting are simultaneously critical.
Availability
SMC50J22CA is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, automotive body control modules, and PLC I/O terminals requiring stable component supply across multi-year production cycles.
Supply support for SMC50J22CA 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, microcontroller, power, and sensing solutions for industrial, automotive, and consumer markets.
The SMC50J series belongs to ST's high-power TVS diode product line, engineered specifically for IEC 61000-4-2/4-4-compliant surge protection in harsh-environment power and signal interfaces.
FAQ
What is the difference between SMC50J22A and SMC50J22CA?
SMC50J22A is unidirectional - it protects only against surges of one polarity and requires correct orientation relative to ground. SMC50J22CA is bidirectional, providing symmetrical clamping for both positive and negative transients without polarity constraints, making it ideal for AC-coupled or floating lines like CAN/LIN buses or transformer-isolated supplies.
Does SMC50J22CA require a heatsink for 5000 W surge handling?
No external heatsink is required for single-pulse 5000 W (10/1000 μs) events because energy dissipation occurs in microseconds and junction temperature rise remains within safe limits. However, PCB copper area under each lead (≥3 cm² recommended) is critical to maintain thermal impedance below 120 °C/W and ensure repeatable surge endurance.
Can SMC50J22CA be used in parallel to increase surge current capacity?
Parallel use is not recommended due to mismatch in dynamic resistance and avalanche turn-on characteristics, which causes uneven current sharing and potential thermal runaway. For higher current handling, select a higher-rated part such as SMC50J33CA (33 V VRM, 53.3 V VCL @ 94 A) or implement staged protection with upstream current-limiting elements.
Is SMC50J22CA compliant with AEC-Q200 for automotive applications?
SMC50J22CA is not AEC-Q200 qualified. While it operates up to 175 °C and meets IEC 61000-4-2/4-4, it lacks the extended temperature cycling, vibration, and failure-rate validation required for automotive qualification. For AEC-Q200-compliant alternatives, consider ST's SMAJ22CA-Q or SP1003-220K.
SMC50J22CA 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):
- 22V (Max)
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 141A
- 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
SMC50J22CA FAQ
1.How can I place an order for SMC50J22CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC50J22CA 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 SMC50J22CA reliable?
The price and inventory of SMC50J22CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC50J22CA is usually 5 days.
3.What payment methods are accepted for SMC50J22CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC50J22CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC50J22CA?
SMC50J22CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC50J22CA 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 SMC50J22CA?
For technical support, including SMC50J22CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC50J22CA requirements.
6.How does Aetrix verify that SMC50J22CA is sourced from the original manufacturer or authorized distributors?
All SMC50J22CA 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 SMC50J22CA meets industry standards.
7.What is the process for return or replacement of SMC50J22CA?
All SMC50J22CA units undergo pre-shipment inspection (PSI). If there is an issue with SMC50J22CA, 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 SMC50J22CA part is unused and in its original packaging.
Return procedure for SMC50J22CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC50J22CA Tags
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