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STMicroelectronics SMC30J20CA
- Part No.:
- SMC30J20CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC30J20CA.pdf
- Description:
- TVS DIODE 20VWM 32.4VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,219
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Product details
Overview
SMC30J20CA 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 3000 W peak pulse power (10/1000 μs), clamps at 32.4 V (max) under 93 A surge current, and operates up to 175 °C junction temperature - enabling robust protection in industrial power supplies, automotive body electronics, and PoE-powered equipment.
For engineers reviewing the SMC30J20CA datasheet, SMC30J20CA pinout, SMC30J20CA application, or SMC30J20CA equivalent, key selection criteria include its 20 V standoff voltage (VRM), bidirectional polarity, low 0.2 µA leakage at 25 °C, JEDEC-registered SMC package, and IEC 61000-4-2 ±30 kV contact/air discharge compliance.
Technical Context
This planar-junction TVS diode uses silicon avalanche technology to provide fast response (<1 ns) to electrostatic discharge and repetitive surges. Its bidirectional configuration enables symmetric clamping on AC lines or differential buses without polarity constraints.
The device features a dynamic resistance (RD) of 24.4 mΩ at 25 °C, enabling precise clamping voltage control (VCL = VBR + RD × IPP), and exhibits stable thermal performance with Tj max = 175 °C and MSL Level 1 moisture sensitivity rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 20 V - maximum continuous reverse operating voltage before breakdown begins. |
| Breakdown Voltage (VBR) | 22.2–24.6 V at 1 mA - defines the onset of avalanche conduction during overvoltage events. |
| Clamping Voltage (VCL) | 32.4 V max at 93 A (10/1000 μs) - peak voltage seen by protected circuit during worst-case surge. |
| Peak Pulse Power (PPP) | 3000 W (10/1000 μs) - energy-handling capability for standard lightning/surge waveforms. |
| Leakage Current (IRM) | 0.2 µA max at VRM and 25 °C - ensures minimal standby power loss and signal integrity in high-impedance circuits. |
| Junction Temperature Range | −55 °C to +175 °C - supports operation in under-hood automotive, industrial motor drives, and outdoor telecom equipment. |
| ESD Rating | ±30 kV per IEC 61000-4-2 (contact & air) - exceeds Level 4 immunity requirements for end-equipment certification. |
Pinout & Package
SMC30J20CA is housed in a JEDEC-standard SMC (DO-214AB) surface-mount package with two terminals: Cathode (K) and Anode (A). The bidirectional structure means both terminals are functionally symmetrical - no polarity marking required for AC or differential line protection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Transient current entry point (bidirectional) | Accepts surge current in either polarity; connects to line being protected (e.g., RS-485 A/B, AC input, Ethernet pair). |
| Cathode (K) | Transient current return path (bidirectional) | Completes low-impedance path to ground or reference rail during clamping; electrically identical to Anode in bidirectional operation. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential interfaces (e.g., CAN FD, RS-485, USB D+/D−) without polarity concerns. |
| Low dynamic resistance (24.4 mΩ) | Minimizes clamping voltage rise under high-current transients, preserving margin for downstream ICs with tight VDD tolerances. |
| High junction temperature rating (175 °C) | Supports placement near heat-generating components (e.g., MOSFETs, inductors) in compact power converters without derating. |
| Matte tin lead finish | Ensures reliable solderability and compatibility with Pb-free reflow profiles per J-STD-020 MSL Level 1. |
| IEC 61000-4-4 Level 4 compliance (4 kV) | Validates robustness against fast-rise electrical fast transients (EFT) in industrial control cabinets and PLC I/O modules. |
Applications
| Industrial Power Supply Inputs | Automotive Body Control Modules |
|---|---|
|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power supply exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary surge clamp on main DC bus, placed upstream of DC-DC converter input filter. Use Value: Limits transient voltage to ≤32.4 V during 93 A surges, preventing damage to 36 V-rated input capacitors and controller ICs. |
Use Scenario: LIN bus line protection in door module where ESD from human contact couples onto wiring harness. IC Role / Device Role / Timing Role: Bidirectional ESD suppressor across LIN signal and ground, mounted at connector interface. Use Value: Absorbs ±30 kV contact discharge per IEC 61000-4-2 without degradation, maintaining <1 µA leakage to avoid LIN bias current errors. |
| POE-Powered Devices (IEEE 802.3af/at) | RS-485 Communication Interfaces |
|
Use Scenario: Secondary-side DC input protection in PoE-powered IP camera, subjected to surge coupling from Ethernet cable. IC Role / Device Role / Timing Role: Standoff-clamp TVS on 48–57 V PoE output rail, coordinated with primary-side isolation barrier. Use Value: Clamps induced surges to <32.4 V while sustaining 175 °C operation in sealed enclosure, ensuring long-term reliability. |
Use Scenario: Differential data line protection in factory automation RS-485 node exposed to ground potential differences and ESD. IC Role / Device Role / Timing Role: Bidirectional TVS across A/B lines and ground, placed adjacent to transceiver IC. Use Value: Maintains signal integrity with <100 pF junction capacitance at 1 V bias, enabling >10 Mbps data rates without distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20CA (STMicroelectronics) | Lower PPP (600 W vs. 3000 W); same VRM (20 V), VCL (32.4 V), and SMC-equivalent SMB package. | Targeted at lower-energy threats (e.g., board-level ESD only); unsuitable for lightning-surge-prone mains inputs. | Select when space-constrained layouts require smaller SMB footprint and surge threat level is limited to IEC 61000-4-2 only. |
| SAC20CA (Littelfuse) | Same VRM (20 V) and bidirectional configuration; higher VCL (34.4 V at 87.5 A), lower PPP (1500 W), and different thermal resistance. | Validated for UL 497B telecom applications; lacks ST's 175 °C Tj rating and JEDEC SMC registration. | Choose for cost-sensitive telecom designs where UL recognition is mandatory and 175 °C operation is not required. |
Compared with SMBJ20CA and SAC20CA, SMC30J20CA uniquely combines 3000 W surge capacity, 175 °C operation, and JEDEC-registered SMC packaging - making it the only option qualified for high-reliability industrial power input and automotive under-hood use cases requiring sustained thermal stability.
Availability
SMC30J20CA is available at Aetrix Electronics and suitable for industrial power supply inputs, automotive body control modules, PoE-powered devices, and RS-485 communication interfaces requiring stable component supply and full IEC/ISO compliance.
Supply support for SMC30J20CA 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 microcontroller technologies for industrial, automotive, and consumer markets.
SMC30J20CA belongs to ST's SMC30J series of high-power TVS diodes, engineered specifically for robust front-end surge protection in harsh environments where thermal resilience and standardized packaging are critical.
FAQ
What is the difference between SMC30J20A and SMC30J20CA?
SMC30J20A is unidirectional - it conducts surge current only from anode to cathode - and must be installed with correct polarity relative to ground. SMC30J20CA is bidirectional, providing symmetrical clamping for AC signals or differential buses without polarity constraints. Both share identical VRM (20 V), VBR, VCL, and thermal ratings.
Can SMC30J20CA be used in parallel for higher surge current handling?
No - TVS diodes like SMC30J20CA exhibit parametric variation in VBR and dynamic resistance, causing uneven current sharing. Parallel connection risks thermal runaway and premature failure. For higher current needs, select a higher-PPP part (e.g., SMC50J20CA) or implement staged protection with upstream current-limiting resistors.
Is SMC30J20CA compliant with RoHS and REACH?
Yes - SMC30J20CA 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 halogen content is below regulated thresholds per IEC 61249-2-21.
What PCB layout practices maximize thermal performance?
Use minimum 1 cm² copper area per pad (per Figure 12 in DS8598), connect both pads to internal ground planes via ≥4 thermal vias each, and avoid placing heat sources within 5 mm. This reduces Rth(j-a) to ~35 °C/W, enabling full 3000 W rating at Tj ≤175 °C with ambient ≤85 °C.
SMC30J20CA 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:
- -
- Bidirectional Channels:
- 1
- 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
SMC30J20CA FAQ
1.How can I place an order for SMC30J20CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC30J20CA 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 SMC30J20CA reliable?
The price and inventory of SMC30J20CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC30J20CA is usually 5 days.
3.What payment methods are accepted for SMC30J20CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC30J20CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC30J20CA?
SMC30J20CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC30J20CA 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 SMC30J20CA?
For technical support, including SMC30J20CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC30J20CA requirements.
6.How does Aetrix verify that SMC30J20CA is sourced from the original manufacturer or authorized distributors?
All SMC30J20CA 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 SMC30J20CA meets industry standards.
7.What is the process for return or replacement of SMC30J20CA?
All SMC30J20CA units undergo pre-shipment inspection (PSI). If there is an issue with SMC30J20CA, 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 SMC30J20CA part is unused and in its original packaging.
Return procedure for SMC30J20CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC30J20CA Tags
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