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STMicroelectronics SMC30J20A
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- Part No.:
- SMC30J20A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC30J20A.pdf
- Description:
- TVS DIODE 20VWM 32.4VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,161
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Product details
Overview
SMC30J20A from STMicroelectronics is a unidirectional transient voltage suppression (TVS) diode designed for high-energy surge protection in DC power lines and signal interfaces. It delivers 3000 W peak pulse power (10/1000 µs), clamps at 32.4 V under 93 A surge current, and features 20 V standoff voltage (VRM), 0.2 µA leakage at 25 °C, and 175 °C maximum junction temperature - enabling robust protection in industrial power supplies and automotive ECUs.
For engineers reviewing the SMC30J20A datasheet, SMC30J20A pinout, SMC30J20A application, or SMC30J20A equivalent, key selection criteria include its 20 V working voltage, low dynamic resistance (24.4 mΩ), IEC 61000-4-2 ±30 kV ESD immunity, and SMC package compatibility with high-reliability PCB layouts requiring thermal stability and low leakage.
Technical Context
The SMC30J20A employs planar silicon avalanche technology to achieve precise breakdown at 22.2–24.6 V (VBR min–max), with clamping voltage tightly controlled at 32.4 V (typ.) under 93 A (10/1000 µs). Its low dynamic resistance (24.4 mΩ) ensures minimal voltage overshoot during fast transients.
It operates across –55 °C to +175 °C junction temperature range and complies with IEC 61000-4-4 Level 4 (4 kV), UL94 V0 flammability, and J-STD-020 MSL Level 1 - confirming suitability for reflow-soldered, high-temperature industrial and automotive environments without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 20 V - maximum continuous reverse operating voltage before conduction begins |
| Breakdown Voltage (VBR) | 22.2–24.6 V at 1 mA - precise avalanche threshold ensuring predictable turn-on during overvoltage events |
| Clamping Voltage (VCL) | 32.4 V at 93 A (10/1000 µs) - limits downstream voltage stress to safe levels during surge |
| Peak Pulse Power (PPP) | 3000 W (10/1000 µs) - sustains high-energy surges common in industrial power rails and automotive load-dump scenarios |
| Leakage Current (IRM) | 0.2 µA at 20 V, 25 °C - negligible standby loss critical for battery-backed and low-power sensor circuits |
| Dynamic Resistance (RD) | 24.4 mΩ - low impedance during clamping minimizes voltage overshoot and improves protection margin |
| Junction Temperature Range | –55 °C to +175 °C - supports operation in under-hood automotive, motor drives, and industrial enclosures |
Pinout & Package
SMC30J20A 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, with matte tin-plated leads and IPC-7531-compliant footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Band) | Surge current sink terminal | Connected to protected line; conducts avalanche current to ground during overvoltage |
| Anode | Reference/ground return path | Typically tied to system ground; completes conduction path for unidirectional clamping |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 ESD immunity | ±30 kV air/contact discharge - exceeds Level 4, eliminating need for external ESD staging in USB, CAN, and sensor interfaces |
| High-temperature reliability | 175 °C max Tj - enables placement near heat sources (e.g., MOSFETs, inductors) without derating or thermal shutdown |
| Low dynamic resistance | 24.4 mΩ - reduces clamping voltage rise under high di/dt, improving protection margin for 3.3 V/5 V logic rails |
| JEDEC-compliant SMC package | Standardized mechanical outline and thermal pad layout - ensures drop-in replacement and consistent reflow yield on FR4 PCBs |
| UL94 V0 flammability rating | Self-extinguishing epoxy body - meets safety requirements for industrial control panels and medical power supplies |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) Power Line |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power supply exposed to load dump and inductive switching noise. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between VIN and GND to clamp transients before DC-DC converter input. Use Value: 32.4 V clamping prevents damage to 36 V-rated input capacitors and ICs; 175 °C rating allows mounting near heatsinks. |
Use Scenario: 12 V battery feed to BCM microcontroller and CAN transceiver, subject to ISO 7637-2 pulses and ESD. IC Role / Device Role / Timing Role: Primary surge suppressor on main power rail, coordinated with secondary LC filtering. Use Value: 3000 W pulse handling absorbs ISO 7637-2 Pulse 1 (–150 V, 50 ms) energy; ±30 kV ESD protects CAN PHY pins. |
| Telecom PoE Injector Port Protection | Renewable Energy Inverter DC Link Monitoring |
Use Scenario: 48 V DC output of IEEE 802.3af/at PoE injector, exposed to cable-induced surges and hot-plug transients. IC Role / Device Role / Timing Role: Standoff-clamp TVS on PSE output, upstream of isolation transformer and DC-DC regulation. Use Value: 20 V VRM matches PoE Class 3–4 nominal voltage; low leakage avoids phantom load in idle mode. |
Use Scenario: Voltage sensing node on 600 V DC link of solar inverter, where precision resistive dividers require transient immunity. IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ ≈ 100 pF at 20 V) shunting divider inputs to ground. Use Value: 32.4 V clamping protects 3.3 V ADC inputs; 24.4 mΩ RD ensures fast response without distorting measurement timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20A (STMicroelectronics) | Same VRM (20 V), lower PPP (600 W), higher VCL (34.4 V at 17.6 A), SMB package (smaller thermal mass) | Limited to lower-energy surges (e.g., board-level ESD only); unsuitable for load dump or IEC 61000-4-4 Level 4 | Select when space-constrained and surge energy ≤600 W; avoid for automotive or industrial mains-connected systems |
| SAC20 (Littelfuse) | Same VRM (20 V), identical PPP (3000 W), slightly higher VCL (33.2 V at 90 A), same SMC package | Compatible footprint and electrical performance; differs in leakage (0.5 µA vs. 0.2 µA) and ESD rating (±25 kV vs. ±30 kV) | Acceptable substitute where ±25 kV ESD suffices and 0.3 µA extra leakage is tolerable in ultra-low-power designs |
Compared with SMBJ20A and SAC20, SMC30J20A offers superior ESD immunity (±30 kV), lower leakage (0.2 µA), and tighter VCL (32.4 V), making it preferred for high-reliability automotive and industrial applications demanding full IEC 61000-4-2/4-4 compliance.
Availability
SMC30J20A is available at Aetrix Electronics and suitable for industrial power supply input protection, automotive body control module (BCM) power line hardening, telecom PoE injector port protection, and renewable energy inverter DC link monitoring requiring stable component supply and long-term lifecycle support.
Supply support for SMC30J20A 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, MCU, power, and discrete components for industrial, automotive, and consumer markets.
The SMC30J series belongs to ST's high-power TVS diode product line, engineered specifically for robust transient suppression in harsh environments - emphasizing low leakage, high-temperature operation, and full IEC/ISO compliance for mission-critical power and interface protection.
FAQ
What is the maximum clamping voltage of SMC30J20A under a 10/1000 µs surge?
The maximum clamping voltage (VCL) of SMC30J20A is 32.4 V when subjected to a 93 A peak pulse current with a 10/1000 µs waveform, measured at 25 °C ambient. This value increases with junction temperature per the αT coefficient (4.53 × 10⁻⁴/°C), reaching ~34.1 V at 125 °C junction temperature.
Is SMC30J20A suitable for bidirectional signal line protection?
No - SMC30J20A is a unidirectional TVS diode, intended for DC power line or single-polarity signal protection. For bidirectional protection (e.g., RS-485, USB D+/D−), the pin-compatible SMC30J20CA variant must be used, which provides symmetrical clamping in both polarities.
Does SMC30J20A meet automotive qualification standards?
While not AEC-Q200 qualified as a standalone part, SMC30J20A meets key automotive-relevant standards including IEC 61000-4-2 (±30 kV ESD), IEC 61000-4-4 Level 4 (4 kV EFT), and operates up to 175 °C junction temperature - enabling use in non-safety-critical automotive subsystems like body electronics when validated within the full system design.
How does the SMC package of SMC30J20A compare thermally to SMA or SMB packages?
The SMC package offers ~2.5× higher thermal mass than SMA and ~1.8× higher than SMB, resulting in lower thermal resistance (Rth(j-a) ≈ 3.5 °C/W on recommended 2 cm² copper) and improved power dissipation capability - critical for sustaining 3000 W pulses without thermal runaway, unlike smaller packages limited to ≤600 W.
SMC30J20A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- SMC30J
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 93A
- Power - Peak Pulse:
- 3000W (3kW)
- 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
SMC30J20A FAQ
1.How can I place an order for SMC30J20A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC30J20A 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 SMC30J20A reliable?
The price and inventory of SMC30J20A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC30J20A is usually 5 days.
3.What payment methods are accepted for SMC30J20A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC30J20A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC30J20A?
SMC30J20A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC30J20A 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 SMC30J20A?
For technical support, including SMC30J20A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC30J20A requirements.
6.How does Aetrix verify that SMC30J20A is sourced from the original manufacturer or authorized distributors?
All SMC30J20A 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 SMC30J20A meets industry standards.
7.What is the process for return or replacement of SMC30J20A?
All SMC30J20A units undergo pre-shipment inspection (PSI). If there is an issue with SMC30J20A, 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 SMC30J20A part is unused and in its original packaging.
Return procedure for SMC30J20A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC30J20A Tags
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