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STMicroelectronics SMC30J22CA
- Part No.:
- SMC30J22CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC30J22CA.pdf
- Description:
- TVS DIODE 22VWM 35.5VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:6,397
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Product details
Overview
SMC30J22CA from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for high-energy ESD and surge protection in DC power lines and signal interfaces. It delivers 3000 W peak pulse power (10/1000 µs), clamps at 35.5 V (max) under 85 A surge current, and operates up to 175 °C junction temperature - enabling robust protection in industrial power supplies, automotive body electronics, and telecom infrastructure.
For engineers reviewing the SMC30J22CA datasheet, SMC30J22CA pinout, SMC30J22CA application, or SMC30J22CA equivalent, key selection criteria include its 22 V standoff voltage, bidirectional polarity, low 0.2 µA leakage at 25 °C, JEDEC-standard SMC package, and compliance with IEC 61000-4-2 (±30 kV contact/air) and IEC 61000-4-4 Level 4 (4 kV).
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 symmetrical clamping across both polarities without external circuitry, supporting AC-coupled interfaces and floating bus lines.
The device features a dynamic resistance of 30.4 mΩ (typical), enabling tight voltage control during high-current transients, and exhibits stable VBR drift with temperature (αT = 9.6 × 10−4/°C), ensuring predictable clamping performance across −55 °C to +175 °C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 22 V - maximum continuous reverse working voltage before significant leakage begins; sets operating margin for 24 V nominal systems. |
| Breakdown Voltage (VBR) | 24.4–27.0 V at 1 mA - guaranteed avalanche initiation range; ensures reliable triggering before downstream IC damage. |
| Clamping Voltage (VCL) | 35.5 V max at 85 A (10/1000 µs) - peak voltage seen by protected circuit during worst-case surge; critical for 3.3 V/5 V/12 V logic interface survival. |
| Peak Pulse Power (PPP) | 3000 W (10/1000 µs) - energy-handling capacity for standard lightning/surge waveforms; supports IEC 61000-4-5 Class 3 compliance with proper layout. |
| Leakage Current (IR) | 0.2 µA max at 22 V and 25 °C - negligible standby power loss and minimal signal distortion in high-impedance sensing paths. |
| Junction Temperature Range | −55 °C to +175 °C - enables deployment in under-hood automotive, industrial motor drives, and outdoor telecom enclosures without derating. |
| ESD Withstand (IEC 61000-4-2) | ±30 kV contact & air discharge - exceeds Level 4 immunity requirements; eliminates need for secondary ESD stages in front-end protection. |
Pinout & Package
SMC30J22CA is housed in a JEDEC-standard SMC (DO-214AB) surface-mount package with matte tin-plated leads, compatible with IPC-7531 footprint and reflow soldering per J-STD-020 MSL Level 1. The bidirectional structure has no anode/cathode distinction - both terminals are electrically symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (K) | Surge return path (bidirectional) | Electrically identical to Anode; forms symmetrical clamping node - connects to protected line (e.g., RS-485 A/B, CAN H/L, or DC rail). |
| Anode (A) | Surge return path (bidirectional) | Electrically identical to Cathode; completes bidirectional clamp loop - ties to same reference as K (e.g., GND or floating return). |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential buses (e.g., RS-485, CAN, USB D+/D−) without polarity concerns. |
| Low dynamic resistance (30.4 mΩ) | Minimizes clamping voltage rise under high di/dt surges, preserving margin for 24 V system ICs with 40 V absolute max ratings. |
| High junction temperature rating (175 °C) | Supports placement near heat sources (e.g., MOSFETs, inductors) in compact power converters without thermal derating. |
| JEDEC SMC package with MSL Level 1 | Allows unlimited floor life and standard reflow processing - eliminates baking requirements and simplifies SMT line integration. |
| UL94 V0 flammability rating | Meets safety standards for enclosed industrial equipment and automotive ECUs where flame propagation must be suppressed. |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protecting 24 V digital input channels in programmable logic controllers against induced surges from relay switching and nearby motor noise. IC Role / Device Role: Primary surge clamp placed between field wiring and optocoupler input, shunting >1 kV transients before they reach isolation barrier. Use Value: Prevents false triggering and optocoupler degradation by limiting transient voltage to ≤35.5 V - well below 40 V absolute max rating of common input buffers. |
Use Scenario: Safeguarding LIN bus transceivers and window lift motor drivers in door modules exposed to load dump and ESD events during assembly. IC Role / Device Role: Bidirectional TVS on LIN data line and 12 V supply rail, absorbing ±30 kV ESD strikes and 4 kV burst noise per IEC 61000-4-4. Use Value: Eliminates need for separate unidirectional devices on each rail polarity, reducing BOM count while maintaining full AC-coupled signal integrity. |
| Telecom Power Feeding Interface | Smart Meter DC Power Input |
|
Use Scenario: Protecting PoE-powered remote units (e.g., IP cameras) against lightning-induced surges on 48 V DC feed lines entering outdoor enclosures. IC Role / Device Role: First-stage clamp on DC input, coordinated with upstream MOVs to handle multi-kA events while limiting let-through voltage to downstream DC/DC converters. Use Value: 3000 W peak power rating sustains 10/1000 µs surges up to 85 A - sufficient for Category C (outdoor) surge environments per IEC 61643-21. |
Use Scenario: Securing 3-phase smart meter power supply inputs against neutral-ground surges and utility grid switching transients in residential installations. IC Role / Device Role: Bidirectional TVS on isolated DC-DC input stage, clamping both positive and negative excursions on 12 V auxiliary rail derived from mains rectification. Use Value: 0.2 µA leakage ensures <1 µW standby loss - critical for battery-backed meters meeting IEC 62053-21 Class 0.5S accuracy over 15-year lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22CA (STMicroelectronics) | Lower 600 W peak power (10/1000 µs); same 22 V VRWM, 35.5 V VCL, SMC → SMB package size reduction. | Targeted at space-constrained consumer electronics with lower surge exposure (e.g., USB-C PD adapters). | Select when board area is critical and surge threat level is ≤Level 3 (IEC 61000-4-5); not suitable for industrial 3000 W requirements. |
| SAC22CA (Littelfuse) | Same 22 V VRWM, 35.5 V VCL, but 400 W PPP; higher leakage (1 µA) and lower Tj max (150 °C). | Designed for cost-sensitive commercial applications with moderate ESD needs (e.g., point-of-sale terminals). | Choose only if budget constraints outweigh reliability needs; insufficient for 175 °C under-hood or high-reliability industrial use. |
Compared with SMBJ22CA and SAC22CA, SMC30J22CA uniquely combines 3000 W surge handling, 175 °C operation, and 0.2 µA leakage - making it the sole option among these three for high-power, high-temperature, low-leakage industrial and automotive deployments.
Availability
SMC30J22CA is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, telecom power feeding interfaces, and smart meter DC power inputs requiring stable component supply across long production lifecycles.
Supply support for SMC30J22CA 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The SMC30J series belongs to ST's high-power TVS portfolio, engineered specifically for robust front-end surge protection in harsh-environment applications where reliability, temperature resilience, and standardized packaging are mandatory.
FAQ
What is the maximum clamping voltage of SMC30J22CA at 85 A?
The maximum clamping voltage (VCL) is 35.5 V under a 10/1000 µs surge waveform at 85 A peak current, measured at Tj = 25 °C. This value increases linearly with junction temperature at 9.6 × 10−4/°C, reaching ~38.2 V at 175 °C - still within safe margins for 40 V-rated downstream components.
Can SMC30J22CA replace unidirectional TVS diodes like SMC30J22A?
No - SMC30J22CA is bidirectional and lacks polarity marking; it cannot substitute for unidirectional SMC30J22A in DC-only applications requiring asymmetric clamping (e.g., protecting a single-rail microcontroller I/O). Using it in such cases may cause unintended conduction during normal operation due to reverse-bias leakage paths.
Does SMC30J22CA require derating above 25 °C ambient?
Yes - peak pulse power must be derated above 25 °C ambient according to Figure 3 in DS8598: at 100 °C ambient, PPP drops to ~1900 W; at 150 °C, it falls to ~800 W. Derating is based on junction temperature limits (Tj ≤ 175 °C), so PCB copper area and thermal design directly impact usable surge capacity.
Is SMC30J22CA compliant with automotive AEC-Q200?
No - SMC30J22CA is not AEC-Q200 qualified. While it meets IEC 61000-4-2/4-4 and operates up to 175 °C, ST does not list it in their AEC-Q200 stress-tested product catalog. For automotive safety-critical modules, consider ST's AEC-Q200-qualified SMAJ22CA or similar qualified variants.
SMC30J22CA 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):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 85A
- 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
SMC30J22CA FAQ
1.How can I place an order for SMC30J22CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC30J22CA 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 SMC30J22CA reliable?
The price and inventory of SMC30J22CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC30J22CA is usually 5 days.
3.What payment methods are accepted for SMC30J22CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC30J22CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC30J22CA?
SMC30J22CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC30J22CA 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 SMC30J22CA?
For technical support, including SMC30J22CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC30J22CA requirements.
6.How does Aetrix verify that SMC30J22CA is sourced from the original manufacturer or authorized distributors?
All SMC30J22CA 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 SMC30J22CA meets industry standards.
7.What is the process for return or replacement of SMC30J22CA?
All SMC30J22CA units undergo pre-shipment inspection (PSI). If there is an issue with SMC30J22CA, 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 SMC30J22CA part is unused and in its original packaging.
Return procedure for SMC30J22CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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