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STMicroelectronics SMC50J24CA
- Part No.:
- SMC50J24CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC50J24CA.pdf
- Description:
- 5000 W, 24 V TVS IN SMC
- Quantity:
- Payment:
- Shipping:
Inventory:950
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Product details
Overview
SMC50J24CA 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 delivers 5000 W peak pulse power (10/1000 µs), clamps at 38.9 V (max) under 129 A surge current, and operates up to 175 °C junction temperature - enabling robust protection in industrial power supplies and automotive ECUs.
For engineers reviewing the SMC50J24CA datasheet, SMC50J24CA pinout, SMC50J24CA application, or SMC50J24CA equivalent, key selection criteria include its bidirectional configuration, low 0.2 µA leakage at 25 °C, JEDEC-registered SMC package compatibility, and IEC 61000-4-2 ±30 kV contact/air discharge compliance - all critical for high-reliability overvoltage hardening.
Technical Context
This TVS diode uses planar silicon junction technology to achieve stable clamping performance across temperature (–55 °C to +175 °C) and low dynamic resistance (27.0 mΩ at 25 °C). Its bidirectional architecture enables symmetrical clamping on AC-coupled or floating lines without polarity constraints.
The device meets IEC 61000-4-4 Level 4 (4 kV fast transient burst) and exceeds IEC 61000-4-2 Level 4 for ESD immunity. Its 24 V standoff voltage (VRM) and 26.7–29.5 V breakdown range (VBR) support 24 V nominal systems with margin for ripple and tolerance drift.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 5000 W - sustains single-event surges typical of lightning-induced transients in 24 V industrial bus lines |
| Clamping Voltage (VCL) at IPP = 129 A | 38.9 V max - limits downstream voltage stress to safe levels for 24 V-rated ICs and MOSFETs |
| Standoff Voltage (VRM) | 24 V - blocks normal 24 V rail operation while triggering only during overvoltage events |
| Leakage Current (IRM) at VRM | 0.2 µA at 25 °C - negligible power loss and minimal impact on high-impedance sensor or control circuits |
| Operating Junction Temperature | –55 °C to +175 °C - supports under-hood automotive, motor drive, and industrial environments without derating |
| ESD Rating (IEC 61000-4-2) | ±30 kV air/contact discharge - exceeds Level 4, eliminating need for external ESD staging in front-end interfaces |
| Package | JEDEC SMC (DO-214AB) - surface-mount footprint compatible with IPC-7531, supports automated assembly and thermal relief |
Pinout & Package
SMC50J24CA is housed in a JEDEC-standard SMC (DO-214AB) package: molded plastic body with two coplanar gull-wing leads, 7.75–8.15 mm width (E), 5.55–6.25 mm length (D), and 1.90–2.45 mm height (A1). Lead finish is matte tin plating per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Cathode-bar side) | Transient current sink (bidirectional) | Acts as cathode during positive transients; anode during negative transients - no polarity dependency in layout |
| Cathode (marked with bar) | Transient current sink (bidirectional) | Marking identifies terminal orientation but does not imply unidirectional function - both terminals conduct equally in either direction |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection on AC, differential, or floating lines without polarity-sensitive placement |
| Low dynamic resistance (27.0 mΩ) | Minimizes clamping voltage rise under high-current surges, improving protection margin for sensitive loads |
| High-temperature operation (Tj ≤ 175 °C) | Eliminates thermal derating in enclosed enclosures or near heat sources like power converters and motors |
| UL94 V0 flammability rating | Ensures flame-retardant housing integrity during sustained overvoltage fault conditions |
| JEDEC SMC package compliance | Guarantees mechanical and thermal interoperability with standard reflow profiles and PCB footprints |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protecting 24 V digital input channels against induced surges from relay coil flyback and nearby motor switching. IC Role / Device Role / Timing Role: Bidirectional TVS placed between field input and optocoupler input, clamping transients before signal conditioning circuitry. Use Value: Prevents false triggering and latch-up in microcontroller GPIOs by limiting voltage to ≤38.9 V during 129 A surges. |
Use Scenario: Safeguarding LIN bus transceivers and power window motor drivers exposed to load dump and jump-start transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V supply rail feeding multiple subsystems, operating alongside upstream fuses and filters. Use Value: Maintains system uptime by absorbing 5000 W surges without degradation, validated to 175 °C junction temperature. |
| Telecom Power Feeds | Renewable Energy Inverters |
|
Use Scenario: Shielding remote radio unit (RRU) DC power inputs from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: First-line transient suppressor on 24–48 V DC feed, coordinated with MOVs and gas discharge tubes in multi-stage protection. Use Value: Provides precise clamping at 38.9 V with <0.2 µA leakage - avoids standby power waste in always-on telecom equipment. |
Use Scenario: Protecting gate drivers and auxiliary power supplies in solar string inverters subjected to grid-switching transients. IC Role / Device Role / Timing Role: Secondary surge clamp on isolated 24 V bias rails, complementing primary AC-side protection. Use Value: Survives repeated 8/20 µs surges up to 72.9 A (50 kW peak) without parameter shift, verified per IEC 61000-4-4. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24CA (STMicroelectronics) | Lower peak power (600 W vs. 5000 W), same SMC footprint but SMB package size | Suitable for lower-energy ESD-only scenarios; insufficient for lightning or inductive switching surges | Select when cost and board space constrain design, and surge energy is limited to <100 mJ |
| SAC24CA (Littelfuse) | Same 24 V VRM and bidirectional function; 4000 W (10/1000 µs) rating and 42.5 V VCL at 110 A | Marginally lower clamping voltage but reduced surge capacity - requires verification against system-level test profiles | Prefer where supply chain diversification is required and 4000 W rating satisfies IEC 61000-4-5 Class 3 requirements |
Compared with SMC50J24CA, SMBJ24CA trades surge robustness for compactness, while SAC24CA offers alternate sourcing with slightly relaxed power handling - both require revalidation of clamping margin and thermal performance in high-temperature deployments.
Availability
SMC50J24CA is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and renewable energy systems requiring stable component supply, long-term lifecycle assurance, and full traceability.
Supply support for SMC50J24CA 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 microcontrollers for industrial, automotive, and consumer markets.
The SMC50J series belongs to ST's high-power TVS portfolio, engineered specifically for demanding surge immunity in 24 V–100 V DC systems where reliability under thermal and electrical stress is non-negotiable.
FAQ
What is the difference between SMC50J24A and SMC50J24CA?
SMC50J24A is unidirectional and conducts only during positive overvoltage events relative to ground, requiring correct polarity placement. SMC50J24CA is bidirectional, providing symmetrical clamping for both positive and negative transients - ideal for AC-coupled, differential, or floating signal paths without polarity concerns.
Can SMC50J24CA be used in parallel for higher surge current handling?
No - paralleling TVS diodes is not recommended due to mismatched breakdown voltages causing uneven current sharing. For higher current capability, select a single higher-rated device such as SMC50J33CA (136 A IPP) or implement staged protection with upstream current-limiting elements.
Does SMC50J24CA meet AEC-Q200 for automotive use?
SMC50J24CA is not AEC-Q200 qualified. While it operates up to 175 °C and passes IEC 61000-4-2/4-4, ST does not list it in their AEC-Q200 stress-tested automotive grade portfolio. For qualified alternatives, consider ST's Automotive-grade SMAJ24CA or SMF24CA series.
What is the thermal resistance (Rth j-a) for SMC50J24CA on a standard FR4 PCB?
On a 70 µm copper FR4 board with recommended footprint (3.14 cm² copper area per lead), Rth j-a is 100 °C/W for short pulses. With 4.5 cm² total copper area, it improves to ~60 °C/W - enabling sustained operation at 175 °C junction temperature under pulsed conditions defined in IEC 61000-4-4.
SMC50J24CA 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):
- 24V (Max)
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 129A
- 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
SMC50J24CA FAQ
1.How can I place an order for SMC50J24CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC50J24CA 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 SMC50J24CA reliable?
The price and inventory of SMC50J24CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC50J24CA is usually 5 days.
3.What payment methods are accepted for SMC50J24CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC50J24CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC50J24CA?
SMC50J24CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC50J24CA 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 SMC50J24CA?
For technical support, including SMC50J24CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC50J24CA requirements.
6.How does Aetrix verify that SMC50J24CA is sourced from the original manufacturer or authorized distributors?
All SMC50J24CA 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 SMC50J24CA meets industry standards.
7.What is the process for return or replacement of SMC50J24CA?
All SMC50J24CA units undergo pre-shipment inspection (PSI). If there is an issue with SMC50J24CA, 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 SMC50J24CA part is unused and in its original packaging.
Return procedure for SMC50J24CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC50J24CA Tags
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