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STMicroelectronics SMCJ33CA-TR
- Part No.:
- SMCJ33CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ33CA-TR.pdf
- Description:
- TVS DIODE 33VWM 69.7VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:1,838
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Product details
Overview
SMCJ33CA-TR from STMicroelectronics is a bidirectional 1500 W transient voltage suppression (TVS) diode in SMC package, designed for high-energy ESD and surge protection in DC power rails and signal lines. It features a standoff voltage (VRM) of 33 V, clamping voltage (VCL) of 53.3 V at 29 A (10/1000 µs), max junction temperature of 150 °C, and leakage current ≤0.2 µA at 25 °C - deployed in industrial power supplies and telecom interface circuits.
For engineers reviewing the SMCJ33CA-TR datasheet, SMCJ33CA-TR pinout, SMCJ33CA-TR application, or SMCJ33CA-TR equivalent, key selection criteria include bidirectional clamping behavior, 53.3 V clamping at 29 A surge, low 0.2 µA leakage at 25 °C, 150 °C operating junction temperature, and SMC package thermal performance on FR4 PCBs with recommended copper area.
Technical Context
The SMCJ33CA-TR uses planar junction silicon technology to achieve low leakage and stable breakdown characteristics across -55 °C to +150 °C. Its bidirectional structure enables symmetrical clamping for AC-coupled or floating lines, with dynamic resistance (RD) of 0.440 Ω at 25 °C - critical for minimizing voltage overshoot during fast transients.
It complies with IEC 61000-4-2 (±30 kV air/contact discharge) and IEC 61000-4-4 Level 4 (4 kV), delivering 1500 W peak pulse power (10/1000 µs) and up to 10 kW (8/20 µs). Thermal impedance is optimized for SMC footprint: Rth(j-a) drops from ~120 °C/W (no copper) to ~40 °C/W with 3.5 cm² copper per lead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 33 V - maximum continuous reverse working voltage before conduction begins. |
| Breakdown Voltage (VBR) | 36.7–38.6 V at 1 mA - ensures reliable triggering above normal operating rail. |
| Clamping Voltage (VCL) | 53.3 V at 29 A (10/1000 µs) - limits downstream voltage stress during surge events. |
| Peak Pulse Power (PPP) | 1500 W (10/1000 µs) - sustains high-energy surges without failure under standard test conditions. |
| Leakage Current (IRM) | ≤0.2 µA at VRM = 33 V and 25 °C - minimizes standby power loss in battery-backed or low-power systems. |
| Junction Temperature Range | -55 °C to +150 °C - supports operation in harsh environments including industrial motor drives and outdoor telecom equipment. |
| ESD Robustness | ±30 kV contact & air discharge (IEC 61000-4-2 Level 4) - exceeds automotive and industrial immunity requirements. |
Pinout & Package
SMCJ33CA-TR is housed in an SMC (DO-214AB) surface-mount package: 7.75–8.15 mm length, 5.55–6.25 mm width, 2.45 mm max height, matte tin-plated leads, JEDEC-registered outline, IPC7531-compliant footprint. Thermal performance requires ≥3.14 cm² copper area per lead on FR4 PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Band) | Surge current sink (bidirectional reference) | Terminal where clamping occurs relative to anode; bidirectional symmetry means either terminal serves as cathode depending on polarity of transient. |
| Anode | Surge current source (bidirectional reference) | Complementary terminal to cathode; forms symmetrical clamping path - no fixed polarity required in layout. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping architecture | Enables protection of AC-coupled, floating, or differential signal lines without polarity constraints. |
| Low dynamic resistance (0.440 Ω) | Reduces clamping voltage rise under high di/dt surges, improving protection margin for sensitive ICs. |
| High-temperature reliability (Tj max = 150 °C) | Supports sustained operation in enclosed power converters and 5G base station front-ends. |
| UL94 V0 epoxy encapsulation | Meets flammability safety standards for industrial and medical end-equipment certifications. |
| JEDEC-standard SMC footprint | Ensures compatibility with automated assembly processes and thermal pad design rules for reflow soldering. |
Applications
| Industrial Power Supply Input Protection | Telecom Ethernet Port Surge Suppression |
|---|---|
|
Use Scenario: 48 V DC input stage of programmable logic controller (PLC) power module exposed to load dump and lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional TVS placed across input rails to clamp transients before upstream DC-DC converter. Use Value: 53.3 V clamping at 29 A prevents overvoltage damage to 60 V-rated MOSFETs and controllers; 1500 W rating handles repetitive 10/1000 µs surges per IEC 61000-4-4. |
Use Scenario: 10/100/1000BASE-T Ethernet PHY interface in network switch exposed to ESD and induced surges via RJ45 magnetics. IC Role / Device Role / Timing Role: Bidirectional TVS on differential pairs (e.g., TX+/TX−) to suppress common-mode transients without distorting signal integrity. Use Value: Low 0.2 µA leakage avoids bias current errors in transformer-coupled PHYs; ±30 kV ESD rating meets IEC 61000-4-2 compliance for Class A equipment. |
| Automotive Body Control Module (BCM) CAN Bus Protection | Renewable Energy Inverter DC Link Monitoring |
|
Use Scenario: CAN_H/CAN_L lines in BCM subjected to ISO 10605 ESD pulses and coupled transients from nearby solenoid switching. IC Role / Device Role / Timing Role: Bidirectional TVS pair across CAN differential pair to clamp both polarities while preserving common-mode rejection. Use Value: Symmetrical 53.3 V clamping ensures equal protection on both lines; 150 °C Tj rating supports under-hood placement near engine control units. |
Use Scenario: Voltage sensing circuit monitoring 400–800 V DC link in solar string inverters, requiring isolation barrier protection against switching spikes. IC Role / Device Role / Timing Role: TVS placed across isolated amplifier inputs to prevent overvoltage damage during IGBT turn-off transients. Use Value: 33 V standoff allows safe operation with 24 V auxiliary supply rails; low leakage avoids measurement drift in precision shunt-based sensing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA-TR | Same VBR/VCL specs but lower PPP = 600 W (10/1000 µs); SMB package (smaller thermal mass). | Suitable only for lower-energy surges; not recommended for IEC 61000-4-4 Level 4 or repeated industrial transients. | Select when space-constrained and surge energy is limited to <600 W. |
| 1.5KE33CA | Through-hole DO-201 package; identical electrical specs but higher thermal resistance and no RoHS-compliant matte tin finish. | Lacks SMC's automated assembly compatibility and UL94 V0 epoxy; unsuitable for high-volume SMT production. | Choose only for legacy through-hole designs or prototyping where reflow compatibility is not required. |
Compared with SMBJ33CA-TR and 1.5KE33CA, SMCJ33CA-TR uniquely balances 1500 W surge capability, SMT manufacturability, and 150 °C junction rating - making it optimal for high-reliability industrial and telecom power interfaces where thermal management and long-term leakage stability are critical.
Availability
SMCJ33CA-TR is available at Aetrix Electronics and suitable for industrial power supply input protection, telecom Ethernet port surge suppression, automotive CAN bus protection, and renewable energy inverter DC link monitoring requiring stable component supply and full traceability.
Supply support for SMCJ33CA-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 analog, microcontroller, power, and sensor solutions 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 demanding >1000 W surge handling, low leakage, and extended temperature operation.
FAQ
What is the difference between SMCJ33CA-TR and SMCJ33A-TR?
SMCJ33CA-TR is bidirectional - it clamps transients of either polarity across its terminals - while SMCJ33A-TR is unidirectional and conducts only when the cathode is positive relative to the anode. The 'CA' suffix denotes bidirectional functionality, essential for AC-coupled or floating signal lines like Ethernet or CAN bus, whereas 'A' is used for DC rail protection where polarity is fixed.
Can SMCJ33CA-TR be used in parallel for higher surge current handling?
No - SMCJ33CA-TR lacks matched dynamic resistance and VBR tolerance for reliable current sharing. Parallel use risks thermal runaway due to parametric mismatch; ST recommends selecting a higher-power single device (e.g., 5.0SMDJ33CA) or using discrete current-sharing resistors if absolutely necessary, though this degrades clamping performance and is not validated in the datasheet.
What is the minimum recommended PCB copper area for thermal performance?
ST specifies ≥3.14 cm² (≈1.54 × 2.05 inches) of 70 µm-thick copper per lead on FR4 to achieve Rth(j-a) ≈ 40 °C/W. With less copper, thermal resistance rises sharply - e.g., 0.5 cm² yields ~120 °C/W - risking junction temperature exceedance during repeated surges or high ambient conditions.
Does SMCJ33CA-TR meet AEC-Q200 for automotive use?
No - SMCJ33CA-TR is not AEC-Q200 qualified. While it operates up to 150 °C and passes IEC 61000-4-2/4-4, ST does not list it in their AEC-Q200 stress-tested portfolio. For automotive applications requiring qualification, consider ST's Automotive-grade SMxJ series (e.g., SMAJ33CA-Q), which undergo additional temperature cycling, humidity, and vibration testing per AEC-Q200 Rev D.
SMCJ33CA-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):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 69.7V
- Current - Peak Pulse (10/1000µs):
- 143A (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
SMCJ33CA-TR FAQ
1.How can I place an order for SMCJ33CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ33CA-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 SMCJ33CA-TR reliable?
The price and inventory of SMCJ33CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ33CA-TR is usually 5 days.
3.What payment methods are accepted for SMCJ33CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ33CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ33CA-TR?
SMCJ33CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ33CA-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 SMCJ33CA-TR?
For technical support, including SMCJ33CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ33CA-TR requirements.
6.How does Aetrix verify that SMCJ33CA-TR is sourced from the original manufacturer or authorized distributors?
All SMCJ33CA-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 SMCJ33CA-TR meets industry standards.
7.What is the process for return or replacement of SMCJ33CA-TR?
All SMCJ33CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ33CA-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 SMCJ33CA-TR part is unused and in its original packaging.
Return procedure for SMCJ33CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ33CA-TR Tags
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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