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STMicroelectronics SMC30J33CA
- Part No.:
- SMC30J33CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC30J33CA.pdf
- Description:
- TVS DIODE 33VWM 53.3VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:1,915
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Product details
Overview
SMC30J33CA 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 53.3 V (max) under 229 A surge current, and operates up to 175 °C junction temperature - enabling robust protection in industrial power supplies, telecom interfaces, and automotive body electronics.
For engineers reviewing the SMC30J33CA datasheet, SMC30J33CA pinout, SMC30J33CA application, or SMC30J33CA equivalent, key selection criteria include its 33 V standoff voltage, bidirectional polarity, low 0.2 µA leakage at 25 °C, JEDEC-registered 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 or floating signal paths.
The device features a dynamic resistance of 10 Ω (typical) at 25 °C and exhibits predictable voltage derating via αT = 10×10−4/°C, allowing accurate clamping voltage estimation across −55 °C to +175 °C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 33 V - maximum continuous reverse working voltage before significant leakage begins; defines safe operating margin for 24 V or 28 V DC systems. |
| Breakdown Voltage (VBR min) | 36.7 V at 1 mA - guaranteed avalanche initiation threshold; ensures reliable triggering before downstream component damage. |
| Clamping Voltage (VCL max) | 53.3 V at 229 A (10/1000 µs) - peak voltage seen by protected circuit during worst-case surge; critical for IC-level overvoltage margining. |
| Peak Pulse Power (PPP) | 3000 W (10/1000 µs) - energy-handling capability for standard lightning/surge waveforms; supports IEC 61000-4-5 Class 3 compliance. |
| Leakage Current (IRM) | 0.2 µA at VRM and 25 °C - ultra-low standby loss; preserves battery life and avoids false triggers in high-impedance sensing circuits. |
| Junction Temperature Range | −55 °C to +175 °C - extended thermal envelope enables deployment in under-hood automotive, industrial motor drives, and outdoor telecom equipment. |
| ESD Rating | ±30 kV contact & air discharge (IEC 61000-4-2) - exceeds Level 4 immunity; eliminates need for secondary ESD stages in USB, RS-485, or CAN bus interfaces. |
Pinout & Package
SMC30J33CA is housed in a JEDEC-standard SMC (DO-214AB) surface-mount package with matte tin-plated leads, optimized for automated assembly and high thermal dissipation on FR4 PCBs. The bidirectional structure has no anode/cathode distinction - both terminals are functionally identical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Surge current entry (negative polarity) | Accepts transient current during negative ESD events; forms symmetrical clamping path with Cathode. |
| Cathode (K) | Surge current entry (positive polarity) | Accepts transient current during positive ESD events; completes bidirectional conduction loop with Anode. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals or floating buses without polarity constraints - reduces BOM count vs. dual-unidirectional solutions. |
| Low dynamic resistance (RD) | 10 Ω typical - minimizes clamping voltage rise under high-current transients, improving protection margin for 3.3 V/5 V logic rails. |
| High junction temperature rating | 175 °C max - maintains reliability in thermally constrained enclosures (e.g., LED drivers, PoE injectors) without derating. |
| JEDEC-registered footprint | Compatible with IPC-7531 recommended land pattern - ensures manufacturability and thermal performance across contract manufacturers. |
| UL94 V-0 flammability rating | Meets safety standards for enclosure-integrated protection in Class I/II power supplies and industrial control panels. |
Applications
| Industrial Power Input Protection | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: 24 V DC input rail of programmable logic controllers exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary surge clamp placed upstream of DC-DC converters and microcontrollers to limit transient voltage to <55 V. Use Value: Withstands 3000 W surges while maintaining 0.2 µA leakage - prevents brownouts during normal operation and avoids thermal runaway at 125 °C ambient. |
Use Scenario: LIN bus transceiver interface subjected to ESD events during vehicle assembly and service. IC Role / Device Role / Timing Role: Bidirectional TVS placed across LIN differential pair to shunt ±30 kV ESD strikes without polarity biasing. Use Value: Clamps within 1 ns to ≤53.3 V, preserving signal integrity and preventing latch-up in LIN PHY ICs rated for 40 V absolute maximum. |
| Telecom Ethernet Surge Protection | Smart Meter Power Line Communication (PLC) |
|
Use Scenario: RJ45 port of PoE-powered network switch encountering induced surges from nearby lightning strikes. IC Role / Device Role / Timing Role: Secondary protection stage after gas discharge tube (GDT), absorbing residual 10/1000 µs energy before Ethernet PHY. Use Value: 3000 W rating handles GDT let-through energy; low capacitance (<100 pF at 1 V) avoids signal attenuation in 100BASE-TX applications. |
Use Scenario: M-Bus or G3-PLC coupling circuit on 230 V AC smart meter front-end, requiring isolation from mains-borne surges. IC Role / Device Role / Timing Role: Bidirectional TVS across PLC transformer secondary to suppress common-mode transients coupled from primary side. Use Value: 33 V standoff matches PLC PHY operating range; 175 °C rating sustains performance inside sealed meter housing at 85 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA (STMicroelectronics) | Lower PPP (600 W), same VRM (33 V), SMB package (smaller footprint, lower thermal mass) | Suitable for space-constrained consumer electronics but insufficient for industrial 3000 W surge requirements | Select only when surge energy is limited to IEC 61000-4-5 Level 2 (1 kV) and board area is critical. |
| 1.5KE33CA (ON Semiconductor) | Same VRM (33 V) and bidirectional function, but through-hole DO-201 package and higher leakage (5 µA) | Requires manual soldering; higher leakage limits use in battery-backed or ultra-low-power sensor nodes | Prefer for legacy through-hole designs where rework tolerance outweighs automated assembly needs. |
Compared with SMBJ33CA and 1.5KE33CA, SMC30J33CA uniquely balances 3000 W surge handling, SMT manufacturability, 0.2 µA leakage, and 175 °C operation - making it the only option qualified for high-reliability industrial and automotive power-line protection where all four parameters are simultaneously required.
Availability
SMC30J33CA is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, telecom infrastructure, and smart metering systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMC30J33CA 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.
The SMC30J TVS series was developed to address high-energy surge protection needs in next-generation power conversion and communication systems, emphasizing reliability under extreme thermal and electrical stress.
FAQ
What is the maximum clamping voltage of SMC30J33CA under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 53.3 V at 229 A peak pulse current for a 10/1000 µs waveform, measured at Tj = 25 °C. This value increases predictably with junction temperature using the αT coefficient (10×10−4/°C), reaching ~58.6 V at 175 °C.
Is SMC30J33CA compatible with lead-free reflow soldering processes?
Yes - SMC30J33CA complies with J-STD-020 MSL Level 1 and supports ST's recommended lead-free reflow profile, peaking at 240–245 °C for 60 seconds (maximum 90 s). Its matte tin plating ensures wetting reliability and avoids whisker growth per JESD201 Class 2.
How does the bidirectional design affect PCB layout compared to unidirectional TVS diodes?
SMC30J33CA requires no polarity-aware placement - either terminal can connect to line or return, simplifying routing and eliminating orientation errors during assembly. Unlike unidirectional devices, it needs no series DC-blocking capacitor for AC-coupled lines, reducing component count and board area.
Can SMC30J33CA be used for protecting RS-485 transceivers?
Yes - its 33 V standoff voltage aligns with RS-485 common-mode range (±7 V to ±12 V), and its 53.3 V clamping voltage stays below typical RS-485 transceiver absolute maximum ratings (e.g., ±25 V). Combined with <100 pF capacitance at 1 V, it preserves signal edge rates up to 20 Mbps.
SMC30J33CA 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):
- 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
SMC30J33CA FAQ
1.How can I place an order for SMC30J33CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC30J33CA 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 SMC30J33CA reliable?
The price and inventory of SMC30J33CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC30J33CA is usually 5 days.
3.What payment methods are accepted for SMC30J33CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC30J33CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC30J33CA?
SMC30J33CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC30J33CA 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 SMC30J33CA?
For technical support, including SMC30J33CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC30J33CA requirements.
6.How does Aetrix verify that SMC30J33CA is sourced from the original manufacturer or authorized distributors?
All SMC30J33CA 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 SMC30J33CA meets industry standards.
7.What is the process for return or replacement of SMC30J33CA?
All SMC30J33CA units undergo pre-shipment inspection (PSI). If there is an issue with SMC30J33CA, 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 SMC30J33CA part is unused and in its original packaging.
Return procedure for SMC30J33CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC30J33CA Tags
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