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Taiwan Semiconductor Corporation SMCJ45CA
- Part No.:
- SMCJ45CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ45CA.pdf
- Description:
- TVS DIODE 45VWM 72.7VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:3,200
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Product details
Overview
SMCJ45CA from Taiwan Semiconductor is a bidirectional 1500W transient voltage suppressor diode in DO-214AB (SMC) package, with 45V working stand-off voltage (VWM), 50–61.1V breakdown voltage (VBR), and 72.7V maximum clamping voltage (VC) at 21A peak impulse current. It protects automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMCJ45CA datasheet, SMCJ45CA pinout, SMCJ45CA application, or SMCJ45CA equivalent, key selection criteria include bidirectional clamping capability, sub-1ps response time, <1µA reverse leakage above 10V, and compliance with JESD201 Class 2 whisker resistance and UL 94V-0 molding compound.
Technical Context
The SMCJ45CA uses a glass-passivated silicon junction optimized for fast transient suppression in high-energy surge environments. Its bidirectional configuration enables symmetrical clamping in AC-coupled or floating signal/power lines without polarity constraints.
It operates across –55°C to +150°C junction temperature range, with 10°C/W junction-to-case thermal resistance and 55°C/W junction-to-ambient rating. The device meets ISO 7637-2 immunity requirements for automotive electronics and supports repetitive surge handling when derated per ambient temperature curves.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 50 / 61.1 V - Breakdown occurs within this range at 1 mA test current, defining turn-on threshold consistency |
| VC @ IPPM | 72.7 V - Clamped voltage at 21 A peak pulse current (10/1000 µs waveform), limiting downstream stress |
| PPK | 1500 W - Peak pulse power dissipation capability under standardized 1 ms surge, enabling robust EFT/ISO protection |
| IR @ VWM | <1 µA - Ultra-low reverse leakage ensures minimal standby power loss and signal integrity in high-impedance circuits |
| TJ max | +150 °C - Maximum junction temperature rating supports operation in under-hood automotive and industrial power supply environments |
| RθJC | 10 °C/W - Low thermal resistance from junction to case allows effective heat transfer to PCB copper or heatsink |
Pinout & Package
DO-214AB (SMC) surface-mount package with matte tin-plated leads, polarity indicated by cathode band (bidirectional function eliminates functional polarity dependence). Weight: 0.210 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient conduction path | Either terminal serves as anode or cathode depending on transient polarity; no DC bias dependency |
| Case (cathode band marking) | Reference marking only | Band denotes physical orientation; electrically non-functional in bidirectional configuration |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| Sub-1 ps response time | Clamps transients before sensitive downstream ICs experience overvoltage stress, critical for CAN/LIN bus and sensor interfaces |
| ISO 7637-2 Pulse compliance | Validated for automotive load-dump and inductive-switching immunity (Pulse 1, 2a, 2b, 3a, 3b), reducing system-level validation effort |
| J-STD-020 Level 1 moisture sensitivity | Enables standard SMT reflow without baking, lowering manufacturing cost and process complexity |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS directives for environmentally regulated end equipment |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs from alternator load dump and relay coil flyback. IC Role / Device Role / Timing Role: Primary clamping element placed at power entry point to limit rail voltage excursion during ISO 7637-2 Pulse 5a events. Use Value: Limits peak rail voltage to ≤72.7 V during 1500 W surges, preventing damage to 36 V-rated DC-DC converters and microcontrollers. | Use Scenario: Shielding digital input modules from field-wiring induced transients in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional TVS shunting common-mode surges between signal lines and chassis ground in 24 V dry-contact inputs. Use Value: Clamps ±72.7 V transients within nanoseconds, preserving signal integrity and avoiding false triggering of optocouplers or Schmitt triggers. |
| LED Driver Surge Suppression | RS-485 Transceiver Protection |
Use Scenario: Safeguarding constant-current LED drivers in streetlight applications exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing line-to-line and line-to-ground energy on DC output rails. Use Value: Withstands repeated 1500 W pulses while maintaining <1 µA leakage, ensuring no impact on driver efficiency or dimming accuracy. | Use Scenario: Protecting half-duplex RS-485 transceivers in building management networks from ESD and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional clamping across differential pair (A/B) and common-mode (GND) to suppress ±15 kV contact ESD per IEC 61000-4-2. Use Value: Sub-1 ps response prevents latch-up in transceivers; 72.7 V clamping keeps differential voltage within receiver common-mode range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45CA (Bourns) | Same 45 V VWM and bidirectional configuration, but rated for 600 W PPK (vs. 1500 W); DO-214AA (SMB) package (smaller footprint, higher thermal resistance) | Limited to lower-energy transients (e.g., IEC 61000-4-5 Level 3); unsuitable for ISO 7637-2 Pulse 5a load dump | Select SMCJ45CA where full 1500 W surge capacity and DO-214AB mechanical robustness are required |
| P6SMB45CA (Littelfuse) | Identical 45 V VWM and bidirectional design, 600 W PPK rating, DO-214AA package; tighter VBR tolerance (50–56 V vs. 50–61.1 V) | Lower clamping voltage (71.4 V) but insufficient for automotive load dump; best suited for consumer electronics ESD protection | Choose SMCJ45CA for industrial or automotive designs demanding validated ISO 7637-2 compliance and higher surge margin |
Compared with SMBJ45CA and P6SMB45CA, the SMCJ45CA delivers triple the peak pulse power (1500 W), lower thermal resistance (10°C/W vs. ~15°C/W), and explicit ISO 7637-2 certification-making it the only option qualified for under-hood automotive power rail protection.
Availability
SMCJ45CA is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC I/O protection, LED driver surge suppression, and RS-485 transceiver protection requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ45CA 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and power MOSFETs for industrial and automotive markets.
The SMCJ series was designed specifically for high-energy transient suppression in harsh environments, targeting ISO 7637-2 compliance and extended temperature operation in automotive ECUs and industrial control systems.
FAQ
What does the 'CA' suffix indicate in SMCJ45CA?
The 'CA' suffix in SMCJ45CA denotes a bidirectional configuration, meaning the device provides symmetrical clamping for both positive and negative transients. Unlike unidirectional variants (e.g., SMCJ45A), the SMCJ45CA has no functional anode/cathode distinction and is used where polarity of incoming surges cannot be guaranteed-such as across AC lines, differential data buses, or floating power domains. This is confirmed in TSC's datasheet Section "Devices for bipolar applications".
Does SMCJ45CA meet automotive-grade reliability standards?
Yes, the SMCJ45CA meets key automotive reliability requirements: it is rated for –55°C to +150°C operating junction temperature, passes JESD201 Class 2 whisker testing, carries J-STD-020 Level 1 moisture sensitivity, and is explicitly validated for ISO 7637-2 Pulse 1/2a/2b/3a/3b immunity. While not AEC-Q200 certified as a standalone component, its electrical and mechanical specs align with Tier 1 automotive subsystem requirements when applied per TSC's recommended layout and derating guidelines.
What is the clamping voltage of SMCJ45CA at its rated peak current?
The SMCJ45CA has a maximum clamping voltage (VC) of 72.7 V at 21 A peak impulse current (IPPM), measured using the standardized 10/1000 µs double-exponential surge waveform. This value is specified in the Electrical Specifications table on page 3 of the TSC S2104 datasheet and represents the upper limit of voltage seen by protected circuitry during worst-case transient events.
Can SMCJ45CA replace SMCJ45A in a design?
No-SMCJ45CA and SMCJ45A are not interchangeable without circuit review. SMCJ45A is unidirectional (anode/cathode polarity matters) with VF = 5.0 V at 100 A forward current, while SMCJ45CA is bidirectional with no forward voltage specification. Substituting SMCJ45CA for SMCJ45A in DC-biased applications may cause unintended conduction or failure to clamp correctly. Always verify polarity requirements and clamping symmetry before replacement.
What is the thermal resistance of SMCJ45CA, and how does it affect PCB layout?
The SMCJ45CA has a junction-to-case thermal resistance (RθJC) of 10°C/W and junction-to-ambient (RθJA) of 55°C/W. To maintain TJ ≤ 150°C under 1500 W surges, PCB layout must maximize copper area connected to both terminals-minimum 100 mm² per pad with 2 oz copper and thermal vias to inner ground planes. Insufficient copper will cause localized overheating and premature failure during repetitive surges, as confirmed by TSC's Fig.2 derating curve.
SMCJ45CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 20.6A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ45CA FAQ
1.How can I place an order for SMCJ45CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ45CA 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 SMCJ45CA reliable?
The price and inventory of SMCJ45CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ45CA is usually 5 days.
3.What payment methods are accepted for SMCJ45CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ45CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ45CA?
SMCJ45CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ45CA 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 SMCJ45CA?
For technical support, including SMCJ45CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ45CA requirements.
6.How does Aetrix verify that SMCJ45CA is sourced from the original manufacturer or authorized distributors?
All SMCJ45CA 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 SMCJ45CA meets industry standards.
7.What is the process for return or replacement of SMCJ45CA?
All SMCJ45CA units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ45CA, 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 SMCJ45CA part is unused and in its original packaging.
Return procedure for SMCJ45CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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