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Taiwan Semiconductor Corporation SMBJ43C
- Part No.:
- SMBJ43C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ43C.pdf
- Description:
- 600W, 53.1V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:6,181
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Product details
Overview
SMBJ43C from Taiwan Semiconductor is a unidirectional 43 V working stand-off voltage, 600 W peak pulse power Transient Voltage Suppressor (TVS) diode in DO-214AA (SMB) package, designed for automotive and industrial ESD/EMI protection of DC power rails and signal lines. It clamps transients to 76.7 V at 8.2 A (10/1000 µs waveform), exhibits <1 µA leakage above 10 V, and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b immunity requirements.
For engineers reviewing the SMBJ43C datasheet, SMBJ43C pinout, SMBJ43C application, or SMBJ43C equivalent, key selection criteria include its 43 V VWM, 76.7 V VC@8.2 A clamping performance, DO-214AA thermal resistance (RθJA = 55 °C/W), bidirectional capability (C suffix), and compliance with J-STD-020 Level 1 moisture sensitivity.
Technical Context
The SMBJ43C is a glass-passivated, single-die TVS diode optimized for fast transient suppression (<1.0 ps response) in automotive power systems and industrial control interfaces. Its unidirectional configuration with cathode band marking enables polarity-aware placement on 12 V/24 V supply rails and CAN/LIN bus protection circuits.
It operates across –55 °C to +150 °C junction temperature range and delivers 600 W non-repetitive peak impulse power under standardized 10/1000 µs surge conditions. Thermal design is supported by RθJC = 10 °C/W and RθJA = 55 °C/W ratings, enabling reliable operation in compact PCB layouts without forced airflow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin for 48 V nominal systems. |
| VBR @ IT = 1 mA | 47.8–58.4 V - Breakdown voltage tolerance ensures consistent turn-on behavior across production lots and temperature. |
| VC @ IPP = 8.2 A | 76.7 V - Clamping voltage limits downstream IC stress during ISO 7637-2 Pulse 1 (inductive load dump) events. |
| IPP (10/1000 µs) | 8.2 A - Peak surge current capacity determines survivability against defined automotive transients. |
| PPK | 600 W - Peak pulse power rating validates robustness against short-duration high-energy surges. |
| RθJA | 55 °C/W - Junction-to-ambient thermal resistance informs board-level thermal design for sustained ambient temperatures up to 125 °C. |
| Moisture Sensitivity | Level 1 per J-STD-020 - Enables standard SMT reflow without baking or special handling. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, matte tin-plated leads, RoHS and halogen-free compliant, weight ≈ 0.090 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-potential node in unidirectional configuration; forms current path during reverse-biased clamping. |
| Cathode (marked band) | High-side transient sink | Connected to protected line (e.g., 48 V rail); conducts surge current to ground when VLINE exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps - Enables suppression of nanosecond-scale ESD events before sensitive logic or analog circuitry is damaged. |
| Glass passivated junction | Enhanced reliability and stable leakage performance over temperature and lifetime vs. epoxy-passivated alternatives. |
| ISO 7637-2 compliance | Validated for Pulse 1 (load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) - critical for automotive ECUs. |
| J-STD-020 Level 1 rating | Eliminates pre-reflow baking and supports standard automated SMT assembly without moisture-related defects. |
| UL 94V-0 molding compound | Ensures flame retardancy in enclosed industrial enclosures and automotive junction boxes. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 48 V battery-supplied ADAS camera modules from load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp surges before DC-DC converter input stage. Use Value: Limits voltage to ≤76.7 V during 8.2 A ISO 7637-2 Pulse 1 events, preventing damage to 65 V-rated input capacitors and controller ICs. |
Use Scenario: Safeguarding RS-485 transceivers in factory automation PLC I/O modules from EFT and lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional clamping device (C suffix) across differential bus lines and ground to suppress common-mode transients. Use Value: Maintains signal integrity by limiting bus voltage excursions to ±76.7 V while supporting >1 Mbps data rates due to low junction capacitance. |
| LED Lighting Driver Protection | Telecom DC Power Input Protection |
Use Scenario: Shielding constant-current LED drivers in streetlight systems from inductive switching spikes generated by magnetic relays. IC Role / Device Role / Timing Role: Unidirectional TVS connected across driver input terminals to absorb 600 W energy pulses without degradation. Use Value: Withstands ≥100,000 surge events per MIL-STD-883H Method 3015.7, ensuring >10-year field life in outdoor deployments. |
Use Scenario: Securing -48 V telecom rectifier outputs against accidental AC line faults and induced surges in central office equipment. IC Role / Device Role / Timing Role: High-power TVS mounted at power entry point to divert fault currents away from upstream PFC and downstream DC-DC stages. Use Value: Delivers 600 W peak power dissipation with RθJA = 55 °C/W, enabling operation at full rating up to 70 °C ambient without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ43CA | Same DO-214AC (SMA) package; higher RθJA = 65 °C/W; VC = 77.4 V @ 8.1 A. | Lower power density due to larger thermal resistance; less suitable for high-density 48 V DC-DC modules. | Select SMBJ43C for tighter thermal constraints and superior clamping consistency in space-constrained automotive modules. |
| ON Semiconductor 1.5SMC43CA | DO-214AB (SMC) package; 1.5 kW rating; VC = 70.1 V @ 21.4 A; 3× footprint area. | Higher surge capacity but incompatible with SMB footprints; requires PCB redesign and layout revalidation. | Choose SMBJ43C when maintaining existing DO-214AA land pattern and minimizing board real estate is mandatory. |
Compared with SMAJ43CA and 1.5SMC43CA, SMBJ43C offers optimal balance of 600 W surge capability, DO-214AA footprint compatibility, and industry-leading thermal performance (RθJA = 55 °C/W), making it preferred for next-generation 48 V automotive electronics where size, thermal headroom, and qualification continuity matter.
Availability
SMBJ43C is available at Aetrix Electronics and suitable for automotive ECU designs, industrial sensor interface protection, and 48 V LED lighting systems requiring stable component supply and full ISO 7637-2 compliance.
Supply support for SMBJ43C 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers, with global distribution and AEC-Q101 qualified product lines.
The SMBJ series was developed specifically for automotive and industrial transient protection, emphasizing robustness under ISO 7637-2, tight parametric tolerances, and high-volume SMT manufacturability in DO-214AA packaging.
FAQ
What is the maximum clamping voltage of SMBJ43C under standard test conditions?
The SMBJ43C has a maximum clamping voltage (VC) of 76.7 V when subjected to an 8.2 A peak impulse current with a 10/1000 µs waveform at TA = 25 °C. This value is guaranteed per the manufacturer's electrical specifications table and defines the upper voltage limit imposed on protected circuitry during surge events.
Is SMBJ43C suitable for bidirectional transient protection?
Yes, SMBJ43C is a bidirectional TVS diode, indicated by the "C" suffix. Its electrical characteristics-including breakdown voltage (47.8–58.4 V), clamping voltage (76.7 V), and leakage current (<1 µA)-apply identically in both forward and reverse directions, making it appropriate for protecting AC-coupled or differential signal lines like RS-485 or CAN FD.
What does the "C" suffix in SMBJ43C signify?
The "C" suffix in SMBJ43C denotes bidirectional functionality. Unlike unidirectional variants (e.g., SMBJ43A), SMBJ43C contains two opposing avalanche diodes in series, enabling symmetrical clamping behavior for both polarities-critical for protecting communication buses and AC-powered circuits without polarity concerns.
Does SMBJ43C meet automotive qualification standards?
Yes, SMBJ43C is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity requirements. Its glass-passivated junction, J-STD-020 Level 1 moisture rating, and –55 °C to +150 °C operating range align with automotive electronic control unit (ECU) environmental demands.
What is the thermal resistance from junction to ambient for SMBJ43C?
The SMBJ43C has a junction-to-ambient thermal resistance (RθJA) of 55 °C/W under standard JEDEC test conditions (single device on 1-inch² copper pad). This value enables accurate thermal modeling for PCB layout verification and confirms suitability for use in sealed enclosures up to 70 °C ambient without active cooling.
SMBJ43C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 76.7V
- Current - Peak Pulse (10/1000µs):
- 8.2A
- Power - Peak Pulse:
- 600W
- 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:
- DO-214AA (SMB)
SMBJ43C FAQ
1.How can I place an order for SMBJ43C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ43C 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 SMBJ43C reliable?
The price and inventory of SMBJ43C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ43C is usually 5 days.
3.What payment methods are accepted for SMBJ43C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ43C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ43C?
SMBJ43C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ43C 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 SMBJ43C?
For technical support, including SMBJ43C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ43C requirements.
6.How does Aetrix verify that SMBJ43C is sourced from the original manufacturer or authorized distributors?
All SMBJ43C 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 SMBJ43C meets industry standards.
7.What is the process for return or replacement of SMBJ43C?
All SMBJ43C units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ43C, 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 SMBJ43C part is unused and in its original packaging.
Return procedure for SMBJ43C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ43C Tags
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