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STMicroelectronics SMC50J30A
- Part No.:
- SMC50J30A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC50J30A.pdf
- Description:
- 5000 W, 30 V TVS IN SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,336
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Product details
Overview
SMC50J30A from STMicroelectronics is a unidirectional 30 V standoff voltage transient voltage suppressor (TVS) diode in SMC package, rated for 5000 W peak pulse power (10/1000 µs), 112.6 A peak pulse current, and 48.4 V clamping voltage at 100 A - designed to protect DC power rails and signal lines in industrial motor drives, telecom power supplies, and automotive body control modules against IEC 61000-4-2 ESD (±30 kV contact/air) and IEC 61000-4-4 EFT (4 kV).
For engineers reviewing the SMC50J30A datasheet, SMC50J30A pinout, SMC50J30A application, or SMC50J30A equivalent, this device delivers verified low leakage (0.2 µA at 25 °C), high junction temperature operation (up to +175 °C), JEDEC-registered SMC package compatibility, and robust 8/20 µs surge capability (64.3 A at 43.0 V) - critical for high-reliability overvoltage protection in thermally constrained environments.
Technical Context
The SMC50J30A employs planar silicon avalanche technology to achieve precise breakdown at 33.2–36.8 V (min–max VBR at 1 mA), with dynamic resistance of 9.9 mΩ enabling fast clamping response under transient stress. Its unidirectional configuration provides cathode-anode polarity protection for positive-rail applications only.
Thermal performance is optimized for sustained operation: maximum junction temperature is +175 °C, and thermal impedance (junction-to-ambient on recommended FR4 footprint) drops to ~40 °C/W at 1 s pulse - supporting reliable surge handling in compact PCB layouts without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 30 V - maximum continuous reverse working voltage before significant leakage begins; sets operating margin for 24 V DC systems. |
| Breakdown Voltage (VBR) | 33.2–36.8 V at 1 mA - tight tolerance ensures predictable turn-on during transients; enables accurate system-level overvoltage threshold design. |
| Clamping Voltage (VCL) | 48.4 V at 100 A (10/1000 µs) - limits downstream voltage stress to safe levels for 3.3 V/5 V logic and MOSFET gate drivers. |
| Peak Pulse Power (PPP) | 5000 W (10/1000 µs) - sustains high-energy surges typical of inductive load switching in industrial controls. |
| Leakage Current (IR) | 0.2 µA at 25 °C - negligible standby power loss and minimal impact on high-impedance sensor bias networks. |
| Junction Temperature Range | −55 °C to +175 °C - supports operation in under-hood automotive, industrial inverters, and sealed power supply enclosures. |
| ESD Robustness | ±30 kV contact/air discharge per IEC 61000-4-2 - exceeds Level 4 requirements, eliminating need for secondary ESD stages in front-end interfaces. |
Pinout & Package
SMC50J30A uses the JEDEC-registered SMC (DO-214AB) surface-mount package: 7.75–8.15 mm length × 5.55–6.25 mm width × 2.45 mm height, matte tin-plated leads, MSL Level 1, compatible with standard reflow profiles (peak 240–245 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Low-side reference terminal | Connected to ground or return path; defines cathode-up orientation for unidirectional clamping. |
| Cathode (K) | High-side transient sink | Connected to protected line (e.g., 24 V rail); conducts surge current to ground when VAK exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Planar avalanche structure | Enables stable VBR with <10.7 ppm/°C tempco (αT), minimizing drift across automotive temperature ranges. |
| Low dynamic resistance (RD) | 9.9 mΩ - reduces clamping overshoot and improves energy absorption efficiency during fast 8/20 µs surges. |
| High-temperature reliability | Rated for continuous operation up to +175 °C junction - eliminates derating concerns in enclosed power converters. |
| JEDEC-compliant footprint | IPC-7531-recommended pad layout ensures manufacturability and thermal performance on standard FR4 boards. |
| UL94 V-0 flammability rating | Validates polymer housing safety in end-equipment requiring fire-resistant components (e.g., UL-certified power supplies). |
Applications
| Industrial Motor Drives | Telecom DC Power Distribution |
|---|---|
|
Use Scenario: Protection of 24 V control logic inputs against back-EMF spikes from solenoid valves and relay coils. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input pin and ground, clamping transients within 1 ns to prevent latch-up in microcontrollers. Use Value: 48.4 V clamping ensures MCU GPIOs (rated ≤5.5 V) remain below absolute maximum ratings even during 100 A surges. |
Use Scenario: Input rail protection for -48 V telecom rectifier modules exposed to lightning-induced surges on outdoor feeder lines. IC Role / Device Role / Timing Role: Primary overvoltage clamp on DC output stage, absorbing up to 5000 W pulses without degradation. Use Value: 175 °C max Tj allows uninterrupted operation during prolonged ambient heating in sealed cabinets. |
| Automotive Body Control Modules | Medical Power Supply Inputs |
|
Use Scenario: CAN bus power line (VBAT) protection in BCMs subjected to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V/24 V supply rail, triggered only during >33.2 V events to avoid false triggering. Use Value: 0.2 µA leakage prevents battery drain in always-on modules meeting ISO 16750-2 quiescent current limits. |
Use Scenario: Secondary-side 5 V/3.3 V DC-DC converter input protection in Class II medical devices with double insulation. IC Role / Device Role / Timing Role: Final-stage transient suppressor after primary MOV/fuse, ensuring clean, low-capacitance (<100 pF) clamping. Use Value: UL94 V-0 rating satisfies IEC 60601-1 enclosure flammability requirements without additional potting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30A (STMicroelectronics) | Same VRWM/VBR, but lower PPP = 600 W (SMB package); 3× smaller footprint, 50% lower surge capacity. | Suitable for space-constrained consumer electronics where 10/1000 µs surges ≤600 W occur. | Select SMBJ30A only if board area is critical and worst-case surge energy is confirmed ≤600 W. |
| 1.5KE30A (ON Semiconductor) | Same 30 V VRWM, but axial DO-201 package; higher VCL = 49.9 V at 100 A; leaded, not RoHS-compliant matte tin. | Legacy industrial equipment with through-hole assembly and no reflow constraints. | Choose 1.5KE30A only for manual repair or legacy production lines lacking SMT capability. |
Compared with SMBJ30A, SMC50J30A delivers 8.3× higher surge power handling in an SMT-compatible package; versus 1.5KE30A, it offers superior thermal cycling reliability, RoHS compliance, and tighter VCL spec - making it optimal for modern high-density, high-reliability power systems.
Availability
SMC50J30A is available at Aetrix Electronics and suitable for industrial motor drives, telecom power distribution, and automotive body control modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMC50J30A 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, power, and microcontroller solutions for industrial, automotive, and consumer markets.
The SMC50J series belongs to ST's high-power TVS portfolio, engineered specifically for robust, high-temperature overvoltage protection in demanding power conversion and interface applications - not general-purpose ESD suppression.
FAQ
What is the maximum clamping voltage of SMC50J30A under a 100 A 10/1000 µs surge?
The maximum clamping voltage is 48.4 V at 100 A for a 10/1000 µs waveform, measured at Tj = 25 °C. This value increases linearly with junction temperature due to the αT coefficient (10.7 × 10−4/°C), reaching ~52.1 V at 125 °C - a critical factor for margining in high-ambient designs.
Can SMC50J30A be used in bidirectional signal line protection?
No - SMC50J30A is unidirectional and lacks symmetrical breakdown in both polarities. For bidirectional protection (e.g., RS-485, USB D+/D−), the SMC50J30CA variant must be used, which features identical VRWM and VBR specs but dual-anode/cathode construction.
Does SMC50J30A require derating at elevated ambient temperatures?
Yes - while rated for Tj up to +175 °C, its peak pulse power must be derated above +25 °C ambient. At 100 °C ambient on a standard FR4 board, PPP drops to ~3200 W (per Figure 3), requiring careful thermal layout or parallel device use for full 5000 W capability.
Is the SMC50J30A compliant with automotive AEC-Q200 stress testing?
No - SMC50J30A is not AEC-Q200 qualified. It meets industrial and telecom standards (IEC 61000-4-2/4-4, UL94 V-0), but automotive-grade equivalents like SMAJ30A-Q or TP50J30A-Q require separate qualification for temperature cycling, humidity, and mechanical shock.
SMC50J30A 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 30V (Max)
- Voltage - Breakdown (Min):
- 33.2V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 103A
- 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
SMC50J30A FAQ
1.How can I place an order for SMC50J30A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC50J30A 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 SMC50J30A reliable?
The price and inventory of SMC50J30A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC50J30A is usually 5 days.
3.What payment methods are accepted for SMC50J30A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC50J30A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC50J30A?
SMC50J30A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC50J30A 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 SMC50J30A?
For technical support, including SMC50J30A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC50J30A requirements.
6.How does Aetrix verify that SMC50J30A is sourced from the original manufacturer or authorized distributors?
All SMC50J30A 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 SMC50J30A meets industry standards.
7.What is the process for return or replacement of SMC50J30A?
All SMC50J30A units undergo pre-shipment inspection (PSI). If there is an issue with SMC50J30A, 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 SMC50J30A part is unused and in its original packaging.
Return procedure for SMC50J30A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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