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Taiwan Semiconductor Corporation SMCJ43CA
- Part No.:
- SMCJ43CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ43CA.pdf
- Description:
- TVS DIODE 43VWM 69.4VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:4,603
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Product details
Overview
SMCJ43CA from Taiwan Semiconductor is a bidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 43V working stand-off voltage (VWM), 47.8–52.8V breakdown voltage (VBR), and 69.4V maximum clamping voltage (VC) at 22A peak pulse current-designed for automotive load-dump and ESD protection in power supply rails and CAN/LIN interfaces.
For engineers reviewing the SMCJ43CA datasheet, SMCJ43CA pinout, SMCJ43CA application, or SMCJ43CA equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, <1µA reverse leakage above 10V, and DO-214AB thermal performance (RθJA = 55°C/W).
Technical Context
The SMCJ43CA employs a glass-passivated silicon junction optimized for fast transient suppression without degradation under repetitive surges. Its bidirectional configuration enables symmetrical clamping in AC-coupled or floating signal paths, eliminating polarity concerns in differential bus protection.
It meets ISO 7637-2 test requirements for automotive electrical systems-including Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnection), and Pulse 3a/3b (capacitive coupling)-with a 10/1000µs waveform-defined peak pulse power rating of 1500W and junction temperature range of –55°C to +150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC rail margin. |
| VBR min/max | 47.8 V / 52.8 V - Breakdown occurs within this band at 1 mA test current; ensures predictable turn-on threshold. |
| VC @ IPPM | 69.4 V at 22 A - Clamped voltage during 10/1000µs surge; determines protected circuit's maximum overvoltage exposure. |
| PPK | 1500 W - Peak pulse power handling per single 1ms transient; supports high-energy automotive transients. |
| IR @ VWM | <1 µA - Reverse leakage at rated stand-off voltage; minimizes standby power loss and signal distortion. |
| RθJA | 55 °C/W - Junction-to-ambient thermal resistance; informs PCB copper area and airflow requirements for thermal management. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, bidirectional, cathode band not applicable (symmetrical terminals).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (bidirectional) | Transient current path | Either terminal conducts during overvoltage in either polarity; no polarity marking required. |
| Case (cathode band absent) | Thermal and mechanical interface | DO-214AB body provides primary heat dissipation path to PCB copper; no internal ground reference. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines, differential buses (e.g., CAN), or floating supplies without polarity constraints. |
| ISO 7637-2 compliance | Validated for automotive Pulse 1, 2a, 2b, 3a, and 3b waveforms-reducing need for system-level retesting. |
| Sub-1 ps response time | Clamps transients before sensitive ICs experience damaging voltage overshoot-critical for high-speed microcontrollers and transceivers. |
| Moisture sensitivity level 1 | Zero bake requirement before reflow; compatible with standard SMT assembly processes without special handling. |
Applications
| Automotive Power Rail Protection | CAN Bus Transient Suppression |
|---|---|
Use Scenario: Protecting 12V/24V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Primary clamping device placed at power entry point to limit rail voltage to ≤69.4V during ISO 7637-2 Pulse 5a events. Use Value: Prevents latch-up or permanent damage to downstream regulators, MCUs, and analog front-ends during high-energy surges. | Use Scenario: Safeguarding CAN FD transceivers against ESD and coupled noise on vehicle wiring harnesses. IC Role / Device Role / Timing Role: Bidirectional TVS placed across CANH–CANL differential pair to clamp common-mode transients up to ±22A. Use Value: Maintains signal integrity and bit error rate (BER) compliance by limiting differential voltage excursion to <69.4V. |
| Industrial Sensor Interface Protection | Smart Lighting Driver Input Stage |
Use Scenario: Shielding 4–20mA or RS-485 sensor nodes from lightning-induced surges in factory environments. IC Role / Device Role / Timing Role: Front-end TVS on twisted-pair input lines to absorb fast transients before signal conditioning circuitry. Use Value: Eliminates need for secondary protection stages, reducing BOM count while meeting IEC 61000-4-5 Level 3 (2kV/1kA) requirements. | Use Scenario: Securing constant-current LED drivers against mains switching transients and capacitor discharge spikes. IC Role / Device Role / Timing Role: Parallel-connected TVS at AC/DC converter output to clamp overvoltage during MOSFET turn-off or transformer ringing. Use Value: Extends LED module lifetime by preventing dielectric breakdown in driver ICs and electrolytic capacitors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43CA (Bourns) | 600W peak power rating; same VWM/VBR/VC specs but lower PPK; SMB package (smaller footprint, higher RθJA = 80°C/W). | Limited to lower-energy transients (e.g., IEC 61000-4-2 ESD only); unsuitable for ISO 7637-2 Pulse 5a load dump. | Select when space-constrained and surge energy is ≤600W; verify thermal derating for ambient >70°C. |
| 1.5KE43CA (ON Semiconductor) | Through-hole DO-201 package; identical 1500W rating and electrical specs; slower mounting, higher inductance, no RoHS/halogen-free assurance. | Not suitable for automated SMT lines; introduces parasitic inductance that degrades clamping speed in high-frequency transients. | Choose only for legacy through-hole designs or prototyping where reflow compatibility is not required. |
Compared with SMBJ43CA and 1.5KE43CA, the SMCJ43CA delivers full 1500W automotive-grade surge immunity in an SMT-optimized DO-214AB package with verified ISO 7637-2 compliance, lower thermal resistance, and halogen-free construction-making it the preferred choice for production automotive and industrial modules requiring AEC-Q200 alignment and volume manufacturability.
Availability
SMCJ43CA is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and smart lighting system integration requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ43CA 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 Taiwanese semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and consumer markets.
The SMCJ series was developed specifically for high-reliability transient suppression in harsh automotive environments-emphasizing ISO 7637-2 compliance, robust thermal performance, and automated assembly compatibility.
FAQ
What is the clamping voltage of the SMCJ43CA under a 10/1000µs surge?
The SMCJ43CA has a maximum clamping voltage (VC) of 69.4 V at 22 A peak pulse current (IPPM), measured using the standardized 10/1000µs double-exponential waveform per IEC 61000-4-5. This value ensures protected circuits remain below critical overvoltage thresholds during high-energy transients such as automotive load dump.
Is the SMCJ43CA suitable for bidirectional signal line protection?
Yes, the SMCJ43CA is explicitly designed for bidirectional operation, with identical electrical characteristics in both polarities. Its CA suffix denotes bidirectional configuration, making it ideal for protecting differential buses like CAN, LIN, RS-485, or AC-coupled analog signals where polarity reversal may occur.
Does the SMCJ43CA meet automotive qualification standards?
The SMCJ43CA meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for transient immunity in 12V and 24V automotive systems. While not AEC-Q200 certified out-of-box, its construction-glass-passivated junction, DO-214AB package, and –55°C to +150°C operating range-aligns with AEC-Q200 stress test profiles used by Tier 1 suppliers.
What is the reverse leakage current specification for the SMCJ43CA?
At its 43 V working stand-off voltage (VWM), the SMCJ43CA exhibits a maximum reverse leakage current (IR) of 1 µA at 25°C. This low leakage preserves signal integrity in high-impedance circuits and minimizes quiescent power loss in always-on automotive modules.
Can the SMCJ43CA be used in place of unidirectional SMCJ43A in existing designs?
No-the SMCJ43CA is bidirectional and lacks polarity marking, whereas the SMCJ43A is unidirectional with a cathode band. Substituting SMCJ43CA for SMCJ43A in DC-biased circuits may cause unintended conduction. Use only where bidirectional clamping is functionally required and layout accommodates symmetrical terminal placement.
SMCJ43CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 2
- Voltage - Reverse Standoff (Typ):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 21.6A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ43CA FAQ
1.How can I place an order for SMCJ43CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ43CA 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 SMCJ43CA reliable?
The price and inventory of SMCJ43CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ43CA is usually 5 days.
3.What payment methods are accepted for SMCJ43CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ43CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ43CA?
SMCJ43CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ43CA 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 SMCJ43CA?
For technical support, including SMCJ43CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ43CA requirements.
6.How does Aetrix verify that SMCJ43CA is sourced from the original manufacturer or authorized distributors?
All SMCJ43CA 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 SMCJ43CA meets industry standards.
7.What is the process for return or replacement of SMCJ43CA?
All SMCJ43CA units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ43CA, 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 SMCJ43CA part is unused and in its original packaging.
Return procedure for SMCJ43CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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