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STMicroelectronics SMC50J48CA
- Part No.:
- SMC50J48CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC50J48CA.pdf
- Description:
- Linear IC's
- Quantity:
- Payment:
- Shipping:
Inventory:9,860
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Product details
Overview
SMC50J48CA from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for high-energy ESD and surge protection in power and signal lines. It delivers 5000 W peak pulse power (10/1000 µs), clamps at 77.4 V (max) under 65 A surge current, and operates up to 175 °C junction temperature - deployed in industrial motor drives, telecom power supplies, and PoE injectors requiring robust IEC 61000-4-2/4-4 compliance.
For engineers reviewing the SMC50J48CA datasheet, SMC50J48CA pinout, SMC50J48CA application, or SMC50J48CA equivalent, key selection criteria include its 48 V standoff voltage, bidirectional polarity, low 0.2 µA leakage at 25 °C, JEDEC-standard SMC package, and verified 30 kV contact/air discharge immunity per IEC 61000-4-2 Level 4.
Technical Context
This planar-junction TVS diode uses silicon avalanche technology to provide symmetric clamping for both positive and negative transients. Its bidirectional structure eliminates polarity dependency in AC-coupled or floating interfaces, and its low dynamic resistance (92.8 mΩ) ensures rapid voltage limiting during 8/20 µs surges up to 100 A.
The device meets MIL-STD-883 Method 3015 for ESD and IEC 61000-4-4 Level 4 (4 kV), with thermal stability enabled by 175 °C max operating junction temperature and JEDEC MSL Level 1 moisture sensitivity rating - supporting reflow soldering without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 48 V - maximum continuous reverse working voltage before clamping initiates |
| Breakdown Voltage (VBR) | 53.2–58.8 V at 1 mA - precise avalanche onset threshold enabling predictable protection margin |
| Clamping Voltage (VCL) | 77.4 V max at 65 A (10/1000 µs) - limits downstream voltage stress during surge events |
| Peak Pulse Power | 5000 W (10/1000 µs); up to 444 W average - sustains repeated surges in industrial power rails |
| Leakage Current | 0.2 µA at 48 V and 25 °C - minimizes standby power loss in battery-backed or low-power systems |
| Junction Temperature Range | −55 °C to +175 °C - supports operation in under-hood automotive, industrial inverters, and outdoor telecom equipment |
| ESD Rating | ±30 kV contact & air discharge (IEC 61000-4-2 Level 4) - exceeds standard requirements for human-body-model robustness |
Pinout & Package
SMC50J48CA is housed in a JEDEC-registered SMC (DO-214AB) surface-mount package with matte tin-plated leads, optimized for high-current PCB layouts and automated assembly. The bidirectional configuration has no anode/cathode distinction; both terminals are electrically symmetrical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Cathode Bar Not Present) | Surge Input Terminal (Bidirectional) | Either terminal accepts transient energy in either polarity - no orientation required during placement |
| Cathode (Cathode Bar Not Present) | Surge Input Terminal (Bidirectional) | Electrically identical to Anode; symmetric clamping enables use on AC lines or floating nodes |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional Surge Protection | Enables single-device protection of AC-coupled interfaces (e.g., RS-485, Ethernet PHY, PoE) without polarity concerns |
| Low Dynamic Resistance | 92.8 mΩ - reduces clamping voltage rise under high di/dt surges, improving protection margin |
| High-Temperature Operation | 175 °C max Tj - maintains reliability in thermally constrained environments like enclosed power converters |
| JEDEC SMC Package | Standardized footprint (7.75 × 5.55 mm) compatible with IPC-7531 layout guidelines and high-volume SMT lines |
| UL94 V-0 & J-STD-020 MSL 1 | Enables lead-free reflow without baking; flame-retardant molding compound meets safety-critical end-equipment standards |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protection of DC bus inputs against load dump and inductive switching transients in servo amplifier modules. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed across input terminals to limit voltage excursions during 10/1000 µs surges up to 5000 W. Use Value: Prevents gate oxide damage to IGBT drivers and overvoltage lockout in PMICs by holding clamped voltage ≤77.4 V at 65 A. |
Use Scenario: Input-stage surge suppression in 48 V telecom rectifiers exposed to lightning-induced surges on primary distribution lines. IC Role / Device Role / Timing Role: Primary-level TVS device absorbing 8/20 µs surges up to 100 A while maintaining <100 ns response time. Use Value: Enables compliance with IEC 61000-4-4 Level 4 (4 kV) without additional series impedance or derating. |
| PoE Injectors | Automotive Body Control Modules |
Use Scenario: Data-line protection on IEEE 802.3af/at/bt PSE ports where differential-mode surges couple onto twisted-pair Ethernet cables. IC Role / Device Role / Timing Role: Bidirectional TVS placed across each data pair (e.g., MDI-X) to suppress ±30 kV ESD per IEC 61000-4-2. Use Value: Eliminates need for separate unidirectional devices per line, reducing BOM count and PCB area by 50%. |
Use Scenario: Protection of LIN bus transceivers and sensor inputs in under-dash ECUs subject to ISO 7637-2 pulse 1/2a/3a transients. IC Role / Device Role / Timing Role: Secondary-level TVS on 12 V supply rail and LIN signal lines, clamping fast transients within 1 ns. Use Value: Maintains functional safety integrity by preventing latch-up in microcontrollers during cold-crank and load-dump events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48CA (STMicroelectronics) | Lower peak power (600 W vs. 5000 W); SMB package (smaller footprint, higher thermal resistance) | Suitable for low-energy signal lines (e.g., CAN, USB), not main power rails | Select when space-constrained and surge energy <100 mJ; avoid for 10/1000 µs >100 W applications |
| SAC48CA (Littelfuse) | Same 48 V VRM and bidirectional function; 4000 W peak power (10/1000 µs); slightly higher VCL (79.4 V @ 65 A) | Approved for UL 497B telecom surge protection; tighter VBR tolerance (±5% vs. ±10%) | Prefer for UL-certified telecom infrastructure; verify layout thermal relief due to lower PPP margin |
Compared with SMBJ48CA and SAC48CA, SMC50J48CA provides 8.3× higher peak power handling and superior thermal robustness for high-energy industrial surges, while SAC48CA offers tighter parametric control for certified telecom deployments - SMBJ48CA serves cost-sensitive, low-power signal protection only.
Availability
SMC50J48CA is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, PoE injectors, and automotive body control modules requiring stable component supply across extended product lifecycles.
Supply support for SMC50J48CA 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, analog, MEMS, and microcontroller solutions for industrial, automotive, and consumer markets.
The SMC50J series belongs to ST's high-power TVS portfolio, engineered specifically for IEC 61000-4-2/4-4-compliant protection in harsh-environment power conversion and communication systems.
FAQ
What is the maximum clamping voltage of SMC50J48CA under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 77.4 V at 65 A for a 10/1000 µs waveform, measured at 25 °C ambient. This value increases with junction temperature at a coefficient of 10.3 × 10⁻⁴/°C, reaching ~82.5 V at 125 °C junction temperature per the datasheet's αT correction formula.
Can SMC50J48CA be used in place of a unidirectional TVS like SMC50J48A?
No - SMC50J48CA is bidirectional and lacks polarity marking; it clamps symmetrically for both polarities. Replacing SMC50J48A (unidirectional, cathode-bar marked) requires verifying circuit topology: bidirectional use is valid only where reverse-bias conduction is acceptable, such as AC lines or floating grounds.
Does SMC50J48CA require derating at elevated ambient temperatures?
Yes - peak pulse power must be derated above 25 °C ambient. At 100 °C ambient, the 10/1000 µs PPP drops to ~3200 W (per Figure 3), and at 150 °C, it falls to ~1800 W. Layout thermal relief (copper area under leads) directly impacts achievable derated power, as shown in Figure 12.
Is SMC50J48CA compliant with RoHS and REACH regulations?
Yes - it carries STMicroelectronics' ECOPACK2 environmental compliance certification, meeting RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Lead finish is matte tin, and the molding compound is halogen-free and UL94 V-0 rated.
SMC50J48CA 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):
- 48V (Max)
- Voltage - Breakdown (Min):
- 53.2V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 65A
- 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
SMC50J48CA FAQ
1.How can I place an order for SMC50J48CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC50J48CA 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 SMC50J48CA reliable?
The price and inventory of SMC50J48CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC50J48CA is usually 5 days.
3.What payment methods are accepted for SMC50J48CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC50J48CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC50J48CA?
SMC50J48CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC50J48CA 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 SMC50J48CA?
For technical support, including SMC50J48CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC50J48CA requirements.
6.How does Aetrix verify that SMC50J48CA is sourced from the original manufacturer or authorized distributors?
All SMC50J48CA 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 SMC50J48CA meets industry standards.
7.What is the process for return or replacement of SMC50J48CA?
All SMC50J48CA units undergo pre-shipment inspection (PSI). If there is an issue with SMC50J48CA, 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 SMC50J48CA part is unused and in its original packaging.
Return procedure for SMC50J48CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC50J48CA Tags
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