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STMicroelectronics SMC30J22A
- Part No.:
- SMC30J22A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC30J22A.pdf
- Description:
- TVS DIODE 22VWM 35.5VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:9,373
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Product details
Overview
SMC30J22A from STMicroelectronics is a unidirectional transient voltage suppression (TVS) diode designed for primary-level 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 100 A surge current, and features low leakage (0.2 µA at 25 °C) and high junction temperature rating (175 °C). It is used in industrial power supplies and telecom line cards to suppress IEC 61000-4-2 ESD (±30 kV contact/air) and IEC 61000-4-4 EFT (4 kV).
For engineers reviewing the SMC30J22A datasheet, SMC30J22A pinout, SMC30J22A application, or SMC30J22A equivalent, this page provides verified electrical specifications, JEDEC-compliant SMC package details, real-world clamping behavior, thermal derating curves, and validated alternatives for robust overvoltage protection design.
Technical Context
The SMC30J22A employs planar silicon avalanche technology optimized for fast response (<1 ns) and stable breakdown across temperature (αT = 9.6 × 10−4/°C). Its unidirectional configuration enables asymmetric protection on positive-rail DC systems without reverse conduction path.
It meets IEC 61000-4-2 Level 4 (±30 kV) and IEC 61000-4-4 Level 4 (4 kV), with dynamic resistance of 30.4 mΩ enabling precise clamping control under high-current transients. Junction-to-ambient thermal impedance is characterized for standard FR4 PCB footprints (Zth(j-a) = 100 °C/W for tp = 1 s).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 3000 W - sustains full-rated surge energy without degradation in typical 1-s duty cycle applications |
| Clamping Voltage (VCL) | 35.5 V max at 100 A - defines maximum voltage seen by protected circuit during worst-case 100 A transient |
| Breakdown Voltage (VBR) | 24.4–27.0 V at 1 mA - ensures reliable triggering above nominal 22 V standoff while avoiding false trips |
| Leakage Current (IR) | 0.2 µA max at 22 V, 25 °C - minimizes standby power loss and avoids interference in high-impedance sensing paths |
| Operating Junction Temp | −55 to +175 °C - supports operation in sealed industrial enclosures and automotive under-hood environments |
| ESD Withstand (IEC 61000-4-2) | ±30 kV air/contact discharge - exceeds Level 4 requirement, eliminating need for secondary ESD stages |
| Dynamic Resistance (RD) | 30.4 mΩ - determines voltage rise slope under surge: ΔV = RD × ΔI, critical for low-voltage rail protection |
Pinout & Package
The SMC30J22A is housed in a JEDEC-registered SMC (DO-214AB) surface-mount package with matte tin-plated leads, compatible with IPC-7531 footprint and J-STD-020 MSL level 1 reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Band) | Surge Current Sink | Connected to protected line; conducts avalanche current to ground during overvoltage events |
| Anode | Reference / Ground Return | Typically tied to system ground or low-side reference; completes conduction path during transient |
Key Features
| Feature | Design Value |
|---|---|
| Low Clamping Ratio (VCL/VBR) | 1.46 (35.5 V / 24.4 V min) - tighter voltage margin than generic TVS diodes, reducing stress on downstream ICs |
| High-Temp Leakage Stability | IR remains ≤1 µA up to 125 °C (per Figure 9) - maintains signal integrity in thermally aggressive power supply designs |
| JEDEC-Compliant Thermal Profile | Zth(j-a) = 100 °C/W (tp = 1 s) on standard FR4 - enables accurate thermal margining without custom heatsinking |
| Robust Whisker Resistance | JESD-201 Class 2 certified - eliminates tin whisker risk in long-life industrial deployments (>10 years) |
| UL94 V0 Flame Rating | Self-extinguishing epoxy body - satisfies safety requirements for enclosed AC/DC adapters and PoE injectors |
Applications
| Industrial PLC I/O Modules | Telecom Line Cards (xDSL/PoE) |
|---|---|
|
Use Scenario: Protecting 24 V DC digital input channels against induced surges from relay switching and nearby lightning strikes. IC Role / Device Role / Timing Role: Primary-level TVS clamp placed directly at connector entry point before signal conditioning circuitry. Use Value: Limits transient voltage to ≤35.5 V, preventing latch-up or gate oxide damage in microcontroller GPIOs and optocouplers. |
Use Scenario: Safeguarding Ethernet PHY interface and PoE power detection circuitry against ESD and longitudinal surges on twisted-pair lines. IC Role / Device Role / Timing Role: Unidirectional TVS on each data pair and power line, coordinated with common-mode chokes. Use Value: Withstands ±30 kV ESD per IEC 61000-4-2 and clamps 4 kV EFT pulses within safe operating area of IEEE 802.3af/at compliant ICs. |
| AC/DC Adapter Secondary Side | Automotive Body Control Modules |
|
Use Scenario: Suppressing flyback spikes and load-dump transients on 12–24 V DC output rails of isolated SMPS units. IC Role / Device Role / Timing Role: Final-stage overvoltage protector downstream of output rectifier and bulk capacitor. Use Value: 175 °C Tj(max) and low leakage ensure reliability under continuous thermal stress in compact, sealed enclosures. |
Use Scenario: Guarding LIN bus transceivers and sensor inputs against battery dump and alternator load transients in vehicle cabin electronics. IC Role / Device Role / Timing Role: Unidirectional TVS on LIN signal line and 12 V supply rail, mounted near connector. Use Value: Fast <1 ns response and 3000 W rating meet ISO 7637-2 Pulse 1/2a/5a immunity requirements without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22A (STMicroelectronics) | Lower peak power (600 W), same VBR range, SMB package (smaller footprint) | Not suitable for 3000 W surge events; limited to low-energy ESD-only zones | Select only when space-constrained and surge threat is limited to IEC 61000-4-2 only |
| SAC22 (Littelfuse) | Same 3000 W rating, but higher VCL (38.9 V @ 100 A), higher leakage (1 µA) | Marginally less protective on 24 V systems due to 3.4 V higher clamping voltage | Acceptable where board layout allows higher clamping headroom and thermal budget permits higher leakage |
Compared with SMBJ22A, SMC30J22A provides 5× higher surge energy handling in identical circuit topology; compared with SAC22, it achieves 3.4 V lower clamping at rated current-critical for protecting 3.3 V or 5 V logic powered from 24 V rails via LDOs.
Availability
SMC30J22A is available at Aetrix Electronics and suitable for industrial PLC I/O modules, telecom line cards, and AC/DC adapter secondary-side protection requiring stable component supply across multi-year production cycles.
Supply support for SMC30J22A 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, and protection devices for industrial, automotive, and consumer markets.
The SMC30J series belongs to ST's high-power TVS portfolio, engineered specifically for robust front-end surge immunity in harsh electromagnetic environments where reliability and thermal stability are non-negotiable.
FAQ
What is the maximum surge current SMC30J22A can handle at 8/20 μs waveform?
Per DS8598 Rev 8 Table 2, SMC30J22A supports up to 48.3 A peak pulse current at 8/20 μs with clamping voltage of 35.5 V. This corresponds to ~40 kW peak power, validated under JEDEC-standard test conditions and confirmed in Figure 4's PPP vs. tp curve.
Does SMC30J22A require derating at elevated ambient temperatures?
Yes. As shown in Figure 3, peak pulse power drops linearly from 3000 W at 25 °C to ~1800 W at 125 °C ambient. Derating must follow the published Zth(j-a) curve (Figure 11) and thermal footprint guidelines (Figure 12) to maintain Tj ≤ 175 °C during surge events.
Can SMC30J22A be used in bidirectional signal protection?
No. SMC30J22A is unidirectional (A suffix); it conducts only during positive overvoltage on the cathode. For bidirectional protection (e.g., RS-485, USB), use SMC30J22CA (CA suffix), which has symmetrical breakdown in both polarities and identical clamping performance.
Is SMC30J22A RoHS and REACH compliant?
Yes. The device carries ECOPACK2 certification per ST's environmental compliance program, with lead-free matte tin plating and halogen-free epoxy molding compound, meeting RoHS Directive 2011/65/EU and REACH SVHC thresholds as documented in ST's material declarations.
SMC30J22A 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):
- 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
SMC30J22A FAQ
1.How can I place an order for SMC30J22A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC30J22A 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 SMC30J22A reliable?
The price and inventory of SMC30J22A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC30J22A is usually 5 days.
3.What payment methods are accepted for SMC30J22A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC30J22A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC30J22A?
SMC30J22A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC30J22A 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 SMC30J22A?
For technical support, including SMC30J22A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC30J22A requirements.
6.How does Aetrix verify that SMC30J22A is sourced from the original manufacturer or authorized distributors?
All SMC30J22A 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 SMC30J22A meets industry standards.
7.What is the process for return or replacement of SMC30J22A?
All SMC30J22A units undergo pre-shipment inspection (PSI). If there is an issue with SMC30J22A, 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 SMC30J22A part is unused and in its original packaging.
Return procedure for SMC30J22A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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