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STMicroelectronics SMC30J33A
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- Part No.:
- SMC30J33A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC30J33A.pdf
- Description:
- TVS DIODE 33VWM 53.3VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:4,697
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Product details
Overview
SMC30J33A from STMicroelectronics is a unidirectional 33 V standoff voltage TVS diode in SMC package, rated for 3000 W peak pulse power (10/1000 µs), 53.3 V clamping voltage at 229 A surge current, and 0.2 µA max leakage at 25 °C. It protects DC power rails and I/O lines in industrial power supplies, telecom interfaces, and automotive ECUs against IEC 61000-4-2 ESD (±30 kV contact/air) and IEC 61000-4-4 EFT (4 kV).
For engineers reviewing the SMC30J33A datasheet, SMC30J33A pinout, SMC30J33A application, or SMC30J33A equivalent, this device is selected for high-reliability transient suppression where low leakage, 175 °C junction operation, JEDEC-compliant SMC footprint, and robust 8/20 µs surge capability (up to 69.7 A) are critical design requirements.
Technical Context
The SMC30J33A uses planar silicon avalanche technology to deliver precise breakdown at 36.7–40.5 V (min–max VBR), with dynamic resistance of 55.5 mΩ enabling tight clamping under fast transients. Its thermal design supports continuous operation up to Tj = 175 °C, validated per JESD22-B102 E3 and MIL-STD-750 Method 2026.
It complies with IEC 61000-4-2 Level 4 (±30 kV), IEC 61000-4-4 Level 4 (4 kV), UL94 V0 flammability, and J-STD-020 MSL Level 1-enabling reflow soldering without moisture sensitivity concerns. The unidirectional configuration provides forward conduction path for DC-biased lines while blocking reverse leakage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 33 V - Maximum continuous reverse operating voltage before clamping begins. |
| Breakdown Voltage (VBR) | 36.7–40.5 V @ 1 mA - Ensures reliable turn-on margin above 33 V rail without false triggering. |
| Clamping Voltage (VCL) | 53.3 V @ 229 A (10/1000 µs) - Limits downstream voltage stress to safe levels during surge events. |
| Peak Pulse Power | 3000 W (10/1000 µs) - Sustains high-energy transients common in industrial power input stages. |
| Leakage Current | 0.2 µA @ 33 V, 25 °C - Minimizes standby power loss in battery-backed or low-power sensor circuits. |
| Junction Temperature Range | −55 to +175 °C - Enables deployment in under-hood automotive, industrial motor drives, and outdoor telecom equipment. |
| Dynamic Resistance (RD) | 55.5 mΩ - Low impedance ensures rapid voltage stabilization during fast-rising surges (e.g., EFT bursts). |
Pinout & Package
SMC30J33A is housed in a JEDEC-standard 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, IPC7531-compliant footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Forward conduction terminal | Connected to ground or low-side reference; conducts during positive transients on cathode side. |
| Cathode (K) | Reverse-biased clamping terminal | Connected to protected line (e.g., 33 V rail); avalanches when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| High surge robustness | 3000 W (10/1000 µs) and up to 40 kW (8/20 µs) - Handles repetitive lightning-induced surges in AC/DC front-ends. |
| Low clamping ratio | VCL/VBR ≈ 1.45 - Tight voltage control preserves margin for downstream 3.3 V or 5 V logic protection. |
| High-temperature reliability | Tjmax = 175 °C - Maintains stable VBR and leakage in thermally constrained enclosures. |
| ESD immunity | ±30 kV contact/air per IEC 61000-4-2 - Eliminates need for secondary ESD protection on board-level interfaces. |
| JEDEC-compliant packaging | SMC outline per Table 3, IPC7531 footprint - Ensures compatibility with automated SMT assembly and thermal pad layout rules. |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) I/O Lines |
|---|---|
|
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 placed between 24 V rail and chassis ground to clamp transients before they reach DC-DC converter ICs. Use Value: Clamps 3000 W surges to ≤53.3 V, preventing overvoltage failure of 36 V-rated input capacitors and MOSFET gate drivers. |
Use Scenario: LIN bus signal line in BCM subjected to ESD events during connector mating and cable harness routing near high-current solenoids. IC Role / Device Role / Timing Role: Standoff-limited TVS connected between LIN data line and ground, providing sub-nanosecond response to ±30 kV ESD pulses. Use Value: 0.2 µA leakage avoids bias current errors in LIN transceiver's internal pull-up, preserving bus timing integrity. |
| Telecom PoE+ Data Line Surge Suppression | Renewable Energy Inverter DC Link Monitoring |
|
Use Scenario: Ethernet data pair (pins 3/6) in IEEE 802.3at PoE+ injector, subject to induced surges from nearby AC mains and lightning coupling. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS (paired with complementary device) across differential pair to suppress common-mode transients. Use Value: 55.5 mΩ RD ensures <10 ns clamping delay, limiting voltage overshoot below PHY IC absolute maximum ratings (±16 V). |
Use Scenario: Voltage sense line monitoring 400 V DC link in solar microinverter, requiring isolation from switching noise and grid fault transients. IC Role / Device Role / Timing Role: High-VRM TVS placed at op-amp input to protect precision resistor divider from 4 kV EFT bursts per IEC 61000-4-4. Use Value: 175 °C Tjmax allows placement near heatsinks without derating, maintaining accuracy of 0.1% voltage feedback loop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A (STMicroelectronics) | Lower peak power: 600 W (10/1000 µs); same VRM, VBR, and SMC-compatible SMB package. | Not suitable for 3000 W surge environments; limited to low-energy signal-line protection. | Select only if system-level testing confirms <600 W surge exposure and PCB space constraints favor SMB footprint. |
| 1.5KE33A (ON Semiconductor) | Higher leakage: 5 µA @ 33 V; axial DO-201 package; 1500 W rating (10/1000 µs); no 8/20 µs rating specified. | Requires through-hole assembly; unsuitable for high-density SMT layouts or automotive vibration environments. | Consider only for legacy through-hole designs where rework cost outweighs performance trade-offs. |
Compared with SMBJ33A and 1.5KE33A, SMC30J33A delivers 5× higher surge power handling in an SMT-optimized package with 25× lower leakage and full IEC 61000-4-2/4-4 certification-making it the sole choice for next-generation industrial and automotive power interface protection.
Availability
SMC30J33A is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, telecom PoE injectors, and renewable energy inverters requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMC30J33A 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, MCU, and sensor solutions for industrial, automotive, and consumer markets.
The SMC30J TVS series targets high-reliability transient suppression in harsh environments-specifically engineered for applications demanding >3000 W surge immunity, 175 °C operation, and zero-maintenance protection of sensitive power and data interfaces.
FAQ
What is the maximum clamping voltage of SMC30J33A under a 10/1000 µs surge?
The maximum clamping voltage is 53.3 V at 229 A peak pulse current (10/1000 µs waveform), measured at Tamb = 25 °C. This value increases with junction temperature per αT = 10 × 10−4/°C, reaching ~55.5 V at Tj = 125 °C using the formula VCL(Tj) = VCL(25 °C) × [1 + αT × (Tj − 25)].
Can SMC30J33A be used in bidirectional signal protection?
No-SMC30J33A is unidirectional and must be used with cathode tied to the protected line and anode to ground. For bidirectional protection (e.g., USB, RS-485), use the complementary SMC30J33CA variant, which features symmetrical breakdown in both polarities and identical clamping performance.
Does SMC30J33A meet automotive AEC-Q200 requirements?
SMC30J33A is not AEC-Q200 qualified. While it operates up to 175 °C and passes JESD22-B102 E3 and MIL-STD-750 Method 2026, STMicroelectronics does not list it in their AEC-Q200-certified TVS portfolio. For automotive-critical applications, consider the AEC-Q200-qualified SMAJ33A or SM8S33A series instead.
What is the recommended PCB footprint for SMC30J33A?
The recommended footprint matches IPC7531 Class B for SMC packages: 8.19 mm pad length × 3.14 mm pad width, with 1.54 mm spacing between pad centers. Copper area under each lead should exceed 2 cm² to maintain Rth(j-a) ≤ 100 °C/W and prevent thermal runaway during repeated surges.
SMC30J33A 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):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 56A
- 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
SMC30J33A FAQ
1.How can I place an order for SMC30J33A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC30J33A 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 SMC30J33A reliable?
The price and inventory of SMC30J33A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC30J33A is usually 5 days.
3.What payment methods are accepted for SMC30J33A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC30J33A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC30J33A?
SMC30J33A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC30J33A 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 SMC30J33A?
For technical support, including SMC30J33A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC30J33A requirements.
6.How does Aetrix verify that SMC30J33A is sourced from the original manufacturer or authorized distributors?
All SMC30J33A 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 SMC30J33A meets industry standards.
7.What is the process for return or replacement of SMC30J33A?
All SMC30J33A units undergo pre-shipment inspection (PSI). If there is an issue with SMC30J33A, 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 SMC30J33A part is unused and in its original packaging.
Return procedure for SMC30J33A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC30J33A Tags
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