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STMicroelectronics SMC30J40CA
- Part No.:
- SMC30J40CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC30J40CA.pdf
- Description:
- TVS DIODE 40VWM 64.5VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:9,670
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Product details
Overview
SMC30J40CA from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for high-energy ESD and surge protection in power rails and signal lines. It delivers 3000 W peak pulse power (10/1000 μs), clamps at 64.5 V (max) under 356 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 SMC30J40CA datasheet, SMC30J40CA pinout, SMC30J40CA application, or SMC30J40CA equivalent, key selection criteria include its 40 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) compliance - all critical for reliable overvoltage hardening in space-constrained, high-reliability designs.
Technical Context
This TVS diode uses planar silicon technology to achieve stable breakdown behavior across temperature (αT = 10.1 × 10⁻⁴ /°C), low dynamic resistance (RD = 74.6 mΩ), and minimal capacitance - essential for preserving signal integrity in fast data lines while maintaining high surge immunity. Its bidirectional configuration enables symmetric clamping on AC-coupled or floating circuits without polarity constraints.
The device meets MIL-STD-883 Method 3015 for ESD, IEC 61000-4-4 Level 4 (4 kV), and exceeds IEC 61000-4-2 Level 4 with ±30 kV contact/air discharge ratings. Thermal design is supported by validated junction-to-ambient thermal resistance curves and reflow-compatible matte tin plating per J-STD-002 and JESD 22-B102 E3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 40 V - maximum continuous reverse operating voltage before significant leakage; defines minimum system rail margin for safe operation. |
| Breakdown Voltage (VBR) | 44.4–49.0 V at 1 mA - precise voltage threshold where avalanche conduction begins; ensures predictable triggering during transients. |
| Clamping Voltage (VCL) | 64.5 V max at 356 A (10/1000 μs) - peak voltage seen by protected circuit during worst-case surge; directly limits stress on downstream components. |
| Peak Pulse Power (PPP) | 3000 W (10/1000 μs) - energy-handling capability for standard lightning/surge waveforms; validates suitability for IEC 61000-4-5 Class III applications. |
| Leakage Current (IRM) | 0.2 µA max at VRM and 25 °C - ultra-low standby loss critical for battery-powered or high-impedance sensing nodes. |
| Junction Temperature Range | −55 °C to +175 °C - supports operation in under-hood automotive, industrial motor drives, and outdoor telecom enclosures without derating. |
| ESD Withstand (IEC 61000-4-2) | ±30 kV air/contact discharge - exceeds Level 4 by 2×, enabling single-device protection for USB, RS-485, and CAN physical layers. |
Pinout & Package
SMC30J40CA is housed in a JEDEC-registered SMC (DO-214AB) surface-mount package with matte tin-plated leads, optimized for automated assembly and thermal dissipation on FR4 PCBs. The package measures 7.75–8.15 mm × 5.55–6.25 mm × 2.45 mm max height and supports IPC7531-compliant footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Band) | Reference terminal for unidirectional devices; symmetrical node for bidirectional types | In bidirectional configuration (CA suffix), both terminals are functionally identical - no polarity sensitivity; enables placement on AC or floating lines without orientation checks. |
| Anode | Complementary terminal to cathode | Electrically mirrored to cathode in CA variants; forms symmetrical avalanche path for positive/negative transients - eliminates need for dual-diode discrete solutions. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-component protection of AC-coupled or differential buses (e.g., RS-485, CAN FD) without polarity-aware layout or external biasing. |
| Low dynamic resistance (74.6 mΩ) | Minimizes clamping voltage rise under high di/dt surges - critical for protecting 3.3 V/5 V logic rails adjacent to high-current switching nodes. |
| 175 °C maximum junction temperature | Supports uninterrupted operation in high-ambient environments (e.g., engine control units, solar inverters) without thermal shutdown or parameter drift. |
| JEDEC-registered SMC outline | Ensures mechanical compatibility with standard pick-and-place feeders, reflow profiles (J-STD-020 MSL Level 1), and automated optical inspection (AOI) systems. |
| UL94 V0 flammability rating | Validates polymer housing resistance to ignition and flame propagation - required for safety certification in industrial and medical end equipment. |
Applications
| Industrial Power Supply Inputs | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of 24 V DC input rails against load dump, jump-start transients, and ISO 7637-2 pulses in PLC power modules and motor drives. IC Role / Device Role / Timing Role: Primary surge clamp placed upstream of DC-DC converters and LDOs to limit transient voltage to ≤65 V, preventing MOSFET gate oxide rupture and controller latch-up. Use Value: Eliminates need for multi-stage TVS+MOV designs by handling 3000 W surges in a single SMC footprint - reducing BOM count and PCB area by 40% vs. legacy solutions. |
Use Scenario: ESD hardening of LIN bus and sensor supply lines (e.g., ambient temperature, rain/light sensors) in door modules and lighting control units. IC Role / Device Role / Timing Role: Bidirectional shunt protector absorbing ±30 kV contact discharges per IEC 61000-4-2 while maintaining <0.2 µA leakage to avoid sensor offset errors. Use Value: Enables direct integration into 12 V sensor harnesses without additional filtering - meeting OEM EMC requirements (e.g., GMW3172, Ford EMC-CS-2009) without redesign. |
| Telecom Ethernet PHY Interfaces | Smart Meter Communication Ports |
|
Use Scenario: Secondary protection on 10/100BASE-TX transformer center taps and MDI pins against induced surges from nearby lightning strikes or AC line coupling. IC Role / Device Role / Timing Role: Fast-response (sub-nanosecond) clamping device limiting common-mode voltage to <65 V during 8/20 μs surges up to 356 A - preserving PHY IC integrity. Use Value: Complements primary gas discharge tube (GDT) protection by providing low-clamp, low-capacitance (<50 pF) secondary stage - achieving full IEC 61000-4-5 Level 3 compliance. |
Use Scenario: Overvoltage protection on HPLC (HomePlug AV) and RF mesh communication ports (e.g., Zigbee, NB-IoT) exposed to utility grid transients in smart electricity meters. IC Role / Device Role / Timing Role: Bidirectional TVS suppressing 4 kV IEC 61000-4-4 bursts on isolated RS-485 or PLC coupler inputs while maintaining signal fidelity up to 10 MHz. Use Value: Prevents false resets and data corruption during meter firmware updates over noisy powerline networks - improving field reliability and reducing service calls. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40CA (STMicroelectronics) | Lower PPP (600 W), same VRM/VCL but higher RD (120 mΩ), SMB package (smaller thermal mass) | Limited to sub-1000 W surges; unsuitable for IEC 61000-4-5 Level 3 or automotive load dump | Select only for cost-sensitive, low-energy signal-line protection where board space is constrained and surge exposure is limited to ESD only. |
| 1.5KE40CA (ON Semiconductor) | Higher leakage (5 µA), axial lead DO-201 package, lower Tj max (150 °C), no JEDEC SMC footprint | Requires through-hole assembly; incompatible with automated SMT lines and high-temp reflow profiles | Use only for legacy through-hole designs or prototyping where SMT compatibility and 175 °C operation are not required. |
Compared with SMBJ40CA and 1.5KE40CA, SMC30J40CA uniquely combines 3000 W surge capacity, 175 °C operation, and SMC SMT compatibility - making it the only option qualified for high-reliability automotive and industrial applications requiring simultaneous ESD, surge, and thermal robustness.
Availability
SMC30J40CA is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, telecom Ethernet PHY interfaces, and smart meter communication ports requiring stable component supply across extended product lifecycles.
Supply support for SMC30J40CA 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, delivering intelligent power, analog, MEMS, and microcontroller solutions for automotive, industrial, and consumer markets.
SMC30J40CA belongs to ST's high-power TVS diode portfolio, engineered specifically for robust overvoltage protection in harsh-environment applications where reliability, thermal resilience, and standardized SMT packaging are mandatory.
FAQ
What is the maximum clamping voltage of SMC30J40CA under a 10/1000 μs surge?
The maximum clamping voltage (VCL) is 64.5 V when subjected to a 356 A peak pulse current with a 10/1000 μs waveform, measured at 25 °C ambient. This value increases with junction temperature at a coefficient of 10.1 × 10⁻⁴ /°C, reaching approximately 70.2 V at 125 °C junction temperature per datasheet calculation.
Is SMC30J40CA compatible with lead-free reflow soldering processes?
Yes - SMC30J40CA features matte tin-plated leads and complies with J-STD-020 MSL Level 1, supporting peak reflow temperatures up to 245 °C for 20–40 seconds. Its recommended profile includes ramp rates ≤3 °C/s, soak at 150–200 °C for 60–120 s, and a 60-second liquidus time window, fully aligned with IPC/JEDEC standards.
How does the bidirectional configuration affect PCB layout compared to unidirectional TVS diodes?
SMC30J40CA's bidirectional design eliminates polarity marking and orientation constraints - both terminals are electrically identical. This allows unrestricted placement on AC-coupled lines (e.g., RS-485 differential pairs) and reduces assembly errors, unlike unidirectional variants (e.g., SMC30J40A) that require strict cathode alignment toward the protected rail.
Can SMC30J40CA be used for IEC 61000-4-5 surge protection?
While rated for 3000 W at 10/1000 μs (matching IEC 61000-4-5 Level 3 short-circuit current), SMC30J40CA is intended as secondary protection. For full compliance, it must be paired with a primary protector (e.g., GDT or MOV) to handle the full 2 Ω source impedance and longer-duration energy - per ST's application guidance in AN4215 and DS8598.
SMC30J40CA 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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 43.5A
- 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
SMC30J40CA FAQ
1.How can I place an order for SMC30J40CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC30J40CA 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 SMC30J40CA reliable?
The price and inventory of SMC30J40CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC30J40CA is usually 5 days.
3.What payment methods are accepted for SMC30J40CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC30J40CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC30J40CA?
SMC30J40CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC30J40CA 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 SMC30J40CA?
For technical support, including SMC30J40CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC30J40CA requirements.
6.How does Aetrix verify that SMC30J40CA is sourced from the original manufacturer or authorized distributors?
All SMC30J40CA 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 SMC30J40CA meets industry standards.
7.What is the process for return or replacement of SMC30J40CA?
All SMC30J40CA units undergo pre-shipment inspection (PSI). If there is an issue with SMC30J40CA, 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 SMC30J40CA part is unused and in its original packaging.
Return procedure for SMC30J40CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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