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STMicroelectronics SMCJ40CA-TR
- Part No.:
- SMCJ40CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ40CA-TR.pdf
- Description:
- TVS DIODE 40VWM 84VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:6,164
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Product details
Overview
SMCJ40CA-TR from STMicroelectronics is a bidirectional 40 V standoff transient voltage suppression diode in SMC package, rated for 1500 W peak pulse power (10/1000 µs), 84 A peak pulse current, and clamping voltage of 64.5 V at 24 A, designed to protect DC power rails and signal lines against IEC 61000-4-2 ESD (±30 kV contact/air) and IEC 61000-4-4 EFT (4 kV) surges in industrial power supplies.
For engineers reviewing the SMCJ40CA-TR datasheet, SMCJ40CA-TR pinout, SMCJ40CA-TR application, or SMCJ40CA-TR equivalent, key selection criteria include bidirectional clamping behavior, low leakage (≤0.2 µA at 25 °C), high junction temperature capability (Tj max = 150 °C), and compatibility with FR4 PCBs using IPC7531-compliant SMC footprint.
Technical Context
This TVS diode uses planar silicon junction technology to achieve stable breakdown characteristics across -55 °C to +150 °C operating range, with temperature coefficient αT = 10.1 × 10−4/°C enabling predictable VBR and VCL drift over temperature. Its bidirectional structure provides symmetrical clamping for AC-coupled or floating signal paths without polarity dependency.
The device meets IEC 61000-4-2 Level 4 (±30 kV ESD) and IEC 61000-4-4 Level 4 (4 kV EFT) immunity requirements, and its dynamic resistance (RD = 0.644 Ω at 25 °C) ensures rapid voltage limiting during fast transients, minimizing stress on downstream ICs such as microcontrollers, RS-485 transceivers, and sensor front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 40 V - Maximum continuous reverse working voltage before conduction begins; defines safe operating margin for 36–42 V DC rails. |
| Breakdown Voltage (VBR) | 44.4–46.7 V at 1 mA - Confirmed minimum/typical avalanche onset; ensures reliable triggering above system nominal voltage. |
| Clamping Voltage (VCL) | 64.5 V at 24 A (10/1000 µs) - Peak voltage seen by protected circuit during surge; limits stress on 75 V-rated components. |
| Peak Pulse Power (PPP) | 1500 W (10/1000 µs) - Sustained energy absorption capacity; supports repeated surge events in industrial environments. |
| Leakage Current (IR) | ≤0.2 µA at 40 V, 25 °C - Negligible standby power loss; critical for battery-backed or low-power sensor nodes. |
| Junction Temperature Range | −55 °C to +150 °C - Enables operation in under-hood automotive, motor drive, and outdoor telecom enclosures. |
| ESD Withstand | ±30 kV contact & air discharge (IEC 61000-4-2) - Exceeds Level 4 requirement; eliminates need for additional ESD staging. |
Pinout & Package
The SMCJ40CA-TR is housed in an SMC (DO-214AB) surface-mount package with two terminals: Cathode (K) and Anode (A), configured symmetrically for bidirectional operation. The package features matte tin-plated leads, complies with IPC7531 footprint standards, and supports reflow per J-STD-020 MSL Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Transient current entry point (negative polarity surge) | Accepts negative-going transients; forms one half of symmetrical clamping path with cathode. |
| Cathode (K) | Transient current entry point (positive polarity surge) | Accepts positive-going transients; completes bidirectional protection loop with anode. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), and ungrounded power domains without polarity concerns. |
| Low dynamic resistance (0.644 Ω) | Minimizes clamping voltage overshoot during fast 8/20 µs surges, improving protection margin for 5 V–3.3 V logic interfaces. |
| High-temperature operation (150 °C) | Supports placement near heat sources (e.g., MOSFETs, inductors) in compact SMPS designs without derating. |
| UL94 V0 epoxy body | Meets flammability safety requirements for industrial and medical equipment enclosures. |
| JEDEC-compliant SMC outline | Ensures mechanical compatibility with automated pick-and-place systems and standard reflow profiles (240–245 °C peak). |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Modules |
|---|---|
Use Scenario: Protecting 24 V CAN and LIN bus transceivers from load dump and jump-start induced transients. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector interface to shunt surge energy before reaching PHY layer. Use Value: Clamps 40 V rail to ≤64.5 V during 24 A surge, preserving 75 V-rated CAN transceivers (e.g., TJA1042) without derating. | Use Scenario: Safeguarding 12 V sensor supply lines (e.g., pressure, temperature) against ISO 7637-2 pulse 1/2a/5a. IC Role / Device Role / Timing Role: Primary overvoltage suppressor on VSUPPLY rail upstream of LDO regulators feeding analog sensors. Use Value: Limits transient voltage to 64.5 V while maintaining <0.2 µA leakage, preventing regulator dropout and sensor offset drift. |
| Telecom Power Rectifier Outputs | Renewable Energy Inverter DC Links |
Use Scenario: Guarding secondary-side 48 V DC-DC converter outputs against lightning-induced surges on Ethernet or PoE lines. IC Role / Device Role / Timing Role: Secondary-stage TVS parallel to output capacitor, triggered after primary MOV/GDT stages. Use Value: Absorbs residual 1500 W (10/1000 µs) energy missed by coarse protection, ensuring <100 ns response to fast edges. | Use Scenario: Protecting 400–800 V DC link monitoring circuits in solar inverters from switching transients and grid faults. IC Role / Device Role / Timing Role: Low-leakage clamping element on isolated voltage divider inputs feeding ADCs or comparators. Use Value: Maintains <0.2 µA leakage at 40 V bias, avoiding measurement error in high-impedance sensing networks. |
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-TR | Same VRWM (40 V), lower PPP (600 W), smaller SMB package (3.5 mm × 4.6 mm vs. SMC's 5.6 mm × 7.9 mm) | Lower surge energy handling; suitable only for sub-600 W threat environments (e.g., consumer USB ports) | Select when board space is constrained and surge severity is limited to IEC 61000-4-2 Level 2. |
| 1.5KE40CA | Same VRWM and PPP, but axial DO-201 package (lead pitch 5.3 mm, manual assembly) | Not compatible with automated SMT lines; higher thermal resistance limits high-frequency surge repetition rate | Choose only for legacy through-hole designs or prototyping where rework tolerance outweighs production efficiency. |
Compared with SMBJ40CA-TR and 1.5KE40CA, SMCJ40CA-TR delivers optimal balance of high-energy robustness (1500 W), SMT manufacturability, and thermal performance-making it preferred for industrial-grade 24/48 V power rail protection where reliability under repeated surges is critical.
Availability
SMCJ40CA-TR is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and renewable energy systems requiring stable component supply, long-term lifecycle support, and compliance with IEC 61000-4-2/4-4 immunity standards.
Supply support for SMCJ40CA-TR 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 microcontrollers, power devices, sensors, and protection components for industrial, automotive, and consumer markets.
The SMCJ series belongs to ST's high-power TVS diode product line, engineered specifically for robust transient suppression in harsh electromagnetic environments-targeting applications where failure due to ESD or EFT could compromise functional safety or regulatory certification.
FAQ
What is the maximum clamping voltage of SMCJ40CA-TR under a 10/1000 µs surge?
The maximum clamping voltage is 64.5 V at 24 A for a 10/1000 µs waveform, measured at 25 °C ambient. This value increases with junction temperature at a rate of 10.1 × 10⁻⁴/°C, reaching approximately 67.2 V at Tj = 125 °C per the VCL temperature coefficient formula in DS1284 Rev 11.
Can SMCJ40CA-TR be used in place of a unidirectional TVS like SMCJ40A-TR?
No-it is not a drop-in replacement. SMCJ40CA-TR is bidirectional and clamps both polarities symmetrically, whereas SMCJ40A-TR is unidirectional and conducts only during positive surges. Substituting requires verifying circuit topology: bidirectional use is mandatory for AC-coupled or floating lines; unidirectional suffices for grounded DC rails with defined polarity.
What is the recommended PCB footprint for SMCJ40CA-TR?
The official footprint follows IPC7531 and JEDEC DO-214AB standards: pad length 5.11 mm, pad width 3.14 mm, center-to-center spacing 8.19 mm, with 1.54 mm solder mask clearance. Thermal relief via copper area under each lead reduces Rth(j-a)-2 cm² per pad lowers thermal resistance from 120 °C/W to ~80 °C/W per Figure 12 in DS1284.
Does SMCJ40CA-TR meet automotive AEC-Q200 qualification?
No-SMCJ40CA-TR is not AEC-Q200 qualified. It is rated for industrial temperature range (−55 °C to +150 °C) and meets IEC/EN standards, but lacks the extended reliability testing (e.g., temperature cycling, humidity bias) required for automotive grade. For AEC-Q200-compliant alternatives, consider ST's Automotive TVS family (e.g., SMAJ40CA-Q).
SMCJ40CA-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ, TRANSIL™
- 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:
- 84V
- Current - Peak Pulse (10/1000µs):
- 119A (8/20µs)
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
SMCJ40CA-TR FAQ
1.How can I place an order for SMCJ40CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ40CA-TR 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 SMCJ40CA-TR reliable?
The price and inventory of SMCJ40CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ40CA-TR is usually 5 days.
3.What payment methods are accepted for SMCJ40CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ40CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ40CA-TR?
SMCJ40CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ40CA-TR 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 SMCJ40CA-TR?
For technical support, including SMCJ40CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ40CA-TR requirements.
6.How does Aetrix verify that SMCJ40CA-TR is sourced from the original manufacturer or authorized distributors?
All SMCJ40CA-TR 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 SMCJ40CA-TR meets industry standards.
7.What is the process for return or replacement of SMCJ40CA-TR?
All SMCJ40CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ40CA-TR, 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 SMCJ40CA-TR part is unused and in its original packaging.
Return procedure for SMCJ40CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ40CA-TR Tags
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