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STMicroelectronics SMC50J58CA
- Part No.:
- SMC50J58CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC50J58CA.pdf
- Description:
- 5000 W, 58 V TVS IN SMC
- Quantity:
- Payment:
- Shipping:
Inventory:683
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Product details
Overview
SMC50J58CA from STMicroelectronics is a bidirectional 58 V standoff voltage transient voltage suppressor (TVS) diode in SMC package, rated for 5000 W peak pulse power (10/1000 µs), 419 A peak pulse current, and 93.6 V clamping voltage at 25 °C - designed to protect industrial I/O lines, power supply rails, and Ethernet interfaces against IEC 61000-4-2 ESD (±30 kV contact/air) and IEC 61000-4-4 EFT (4 kV).
For engineers reviewing the SMC50J58CA datasheet, SMC50J58CA pinout, SMC50J58CA application, or SMC50J58CA equivalent, this device is selected for high-reliability surge protection where low leakage (≤0.2 µA at VRM), 175 °C junction operation, JEDEC-registered SMC footprint compatibility, and bidirectional clamping symmetry are critical design requirements.
Technical Context
This TVS employs planar silicon avalanche technology with controlled dynamic resistance (RD = 130 mΩ at 25 °C) to deliver precise clamping behavior under fast transients. Its bidirectional structure enables symmetric protection of AC-coupled or floating signal paths without polarity constraints.
It meets IEC 61000-4-2 Level 4 (±30 kV), IEC 61000-4-4 Level 4 (4 kV), and operates across -55 °C to +175 °C junction temperature range - enabling use in automotive under-hood, industrial motor drives, and outdoor telecom equipment where thermal stability and repeatable clamping are essential.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 58 V - maximum continuous reverse operating voltage before conduction begins; defines safe working margin for 48 V DC systems. |
| Breakdown Voltage (VBR min) | 64.6 V at 1 mA - guaranteed avalanche initiation threshold; ensures reliable triggering above system nominal voltage. |
| Clamping Voltage (VCL) | 93.6 V at 419 A (10/1000 µs) - peak voltage seen by protected circuit during worst-case surge; limits stress on downstream ICs. |
| Peak Pulse Power (PPP) | 5000 W (10/1000 µs) - energy-handling capacity for standard lightning/surge waveforms; supports EN 61000-4-5 compliance testing. |
| Leakage Current (IRM) | ≤0.2 µA at 58 V and 25 °C - negligible standby power loss; avoids signal integrity degradation in high-impedance sensor interfaces. |
| Junction Temperature (Tj max) | +175 °C - enables operation in high-ambient environments (e.g., industrial PLC enclosures, EV battery management modules). |
| Package | SMC (DO-214AB) - JEDEC-registered surface-mount outline with 7.75–8.15 mm body width; compatible with IPC-7531 footprint and automated assembly. |
Pinout & Package
SMC50J58CA uses the standard SMC (DO-214AB) package: two-terminal, bidirectional device with no polarity marking required beyond cathode bar orientation per JEDEC spec. The package features matte tin-plated leads, MSL Level 1 rating, and 260 °C soldering tolerance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (Bidirectional) | Surge current path | Both terminals conduct equally during positive/negative transients; no DC bias dependency - ideal for AC lines or differential pairs. |
| Cathode Bar Marking | Polarity indicator | Visible band identifies cathode end per unidirectional convention; for SMC50J58CA, it denotes terminal assignment but does not affect bidirectional function. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | Identical VBR and VCL for ± polarity surges - eliminates need for dual-device placement on balanced interfaces like RS-485 or CAN FD. |
| Low dynamic resistance (RD) | 130 mΩ at 25 °C - minimizes voltage overshoot during fast-rising transients (e.g., EFT bursts), improving protection margin. |
| High-temperature reliability | Rated for continuous operation up to Tj = +175 °C - maintains clamping performance in thermally constrained PCB layouts near power stages. |
| ESD robustness | Exceeds IEC 61000-4-2 Level 4 (±30 kV) - protects human-interface ports (HMI buttons, touchscreens) without external series impedance. |
| JEDEC-compliant SMC footprint | Matches IPC-7531 land pattern - ensures mechanical stability and thermal dissipation during reflow; supports automated optical inspection (AOI). |
Applications
| Industrial I/O Protection | DC Power Rail Clamping |
|---|---|
|
Use Scenario: Protecting 48 V PLC digital input modules from induced surges on field wiring exposed to motor switching noise. IC Role / Device Role / Timing Role: Bidirectional TVS placed across input terminals to clamp common-mode transients before signal conditioning circuitry. Use Value: 93.6 V clamping ensures downstream optocouplers and level shifters remain below absolute maximum ratings during 1 kV/µs ring waves. |
Use Scenario: Safeguarding 48 V DC-DC converter outputs against load dump and back-EMF from solenoid deactivation. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing energy from inductive kickback events lasting <100 µs. Use Value: 5000 W peak power rating handles 100 ms overvoltage spikes without thermal runaway, preserving regulator lifetime. |
| Telecom Line Interface | Automotive Body Control Module |
|
Use Scenario: Shielding PoE-powered Ethernet PHY interfaces (IEEE 802.3af/at) from lightning-induced surges on twisted-pair cables. IC Role / Device Role / Timing Role: Bidirectional TVS on each differential pair (MDI) to suppress mode conversion and maintain signal integrity. Use Value: 130 mΩ RD limits clamping rise time to <1 ns, preventing data corruption during 8/20 µs surges up to 419 A. |
Use Scenario: Protecting LIN bus transceivers and sensor inputs in under-hood BCMs subject to ISO 7637-2 pulse 1/2a/5a. IC Role / Device Role / Timing Role: Primary surge suppression element placed at connector entry point before ESD filter network. Use Value: 175 °C Tj max allows direct mounting near engine bay heat sources while maintaining ≥90% VBR stability across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ58CA (STMicroelectronics) | Same VBR/VCL specs but 600 W PPP rating (10/1000 µs); SMB package (smaller footprint, lower thermal mass) | Limited to lower-energy surges (e.g., board-level ESD only); unsuitable for 4 kV IEC 61000-4-4 line protection | Select when space-constrained and surge threat is limited to user-accessible ports. |
| SAC50-58 (Littelfuse) | 58 V VRM, 93.6 V VCL, but 5000 W rating specified at 8/20 µs only; higher RD (150 mΩ) | Marginally higher clamping overshoot on fast edges; requires derating for repetitive 10/1000 µs events | Prefer for legacy designs already qualified with Littelfuse SAC series; verify thermal cycling endurance. |
Compared with SMBJ58CA and SAC50-58, SMC50J58CA delivers superior thermal robustness (175 °C Tj), JEDEC-registered SMC mechanical reliability, and verified 5000 W capability across both 10/1000 µs and 8/20 µs waveforms - making it optimal for mission-critical industrial and automotive front-end protection.
Availability
SMC50J58CA is available at Aetrix Electronics and suitable for industrial I/O protection, DC power rail clamping, telecom line interface, and automotive body control module applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMC50J58CA 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 microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer markets.
SMC50JxxA/CA belongs to ST's high-power TVS diode product line, engineered specifically for robust electromagnetic immunity in harsh environments - emphasizing low leakage, high-temperature operation, and standardized SMC packaging for manufacturability.
FAQ
What is the maximum clamping voltage of SMC50J58CA under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 93.6 V at 419 A for a 10/1000 µs waveform at 25 °C. This value increases with junction temperature at a coefficient of 10.4 × 10⁻⁴/°C, reaching approximately 102 V at 125 °C junction temperature per datasheet Equation 2.
Is SMC50J58CA suitable for protecting RS-485 bus lines?
Yes - its bidirectional architecture, 93.6 V clamping, and low dynamic resistance (130 mΩ) make it ideal for differential RS-485 lines. It can be placed across A/B terminals or used in a three-device configuration (A-GND, B-GND, A-B) to suppress both common- and differential-mode transients per IEC 61000-4-4.
How does SMC50J58CA compare to unidirectional SMC50J58A in layout and function?
Both share identical SMC package dimensions and thermal characteristics, but SMC50J58CA has symmetrical breakdown in both directions, while SMC50J58A conducts only in reverse bias. Layout differs only in cathode bar interpretation: for CA, the bar marks one terminal arbitrarily; for A, it must align with circuit ground reference to avoid forward conduction.
Does SMC50J58CA require derating at elevated ambient temperatures?
Yes - peak pulse power must be reduced per Figure 3 in DS13845. At 125 °C ambient (assuming typical PCB thermal resistance), PPP drops to ~3200 W for 10/1000 µs pulses. Derating is calculated using junction temperature rise: Tj = Tamb + (PPP × RθJA), where RθJA ≈ 45 °C/W on standard FR4 with 1 cm² copper per lead.
SMC50J58CA 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):
- 58V (Max)
- Voltage - Breakdown (Min):
- 64.6V
- Voltage - Clamping (Max) @ Ipp:
- 93.6V
- Current - Peak Pulse (10/1000µs):
- 53A
- 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
SMC50J58CA FAQ
1.How can I place an order for SMC50J58CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC50J58CA 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 SMC50J58CA reliable?
The price and inventory of SMC50J58CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC50J58CA is usually 5 days.
3.What payment methods are accepted for SMC50J58CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC50J58CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC50J58CA?
SMC50J58CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC50J58CA 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 SMC50J58CA?
For technical support, including SMC50J58CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC50J58CA requirements.
6.How does Aetrix verify that SMC50J58CA is sourced from the original manufacturer or authorized distributors?
All SMC50J58CA 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 SMC50J58CA meets industry standards.
7.What is the process for return or replacement of SMC50J58CA?
All SMC50J58CA units undergo pre-shipment inspection (PSI). If there is an issue with SMC50J58CA, 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 SMC50J58CA part is unused and in its original packaging.
Return procedure for SMC50J58CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC50J58CA Tags
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