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Taiwan Semiconductor Corporation SMCJ43C
- Part No.:
- SMCJ43C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ43C.pdf
- Description:
- 1500W, 53.1V, 10%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:8,146
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Product details
Overview
SMCJ43C from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 43V working stand-off voltage (VWM), 47.8–58.4V breakdown voltage (VBR), and 76.7V maximum clamping voltage (VC) at 20A peak pulse current - designed for automotive load-dump and inductive switching protection in power supply rails.
For engineers reviewing the SMCJ43C datasheet, SMCJ43C pinout, SMCJ43C application, or SMCJ43C equivalent, this device delivers verified ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, <1μA reverse leakage above 10V, and robust 150°C junction temperature rating - critical for ESD-hardened industrial control and automotive body electronics.
Technical Context
The SMCJ43C operates as a unidirectional avalanche diode, clamping transients by entering breakdown when reverse voltage exceeds VBR (47.8–58.4V @ 1mA). Its glass-passivated junction ensures stable leakage (<1μA @ VWM) and fast response (<1ps), enabling protection of downstream DC-DC converters and microcontroller I/O against EFT and load dump.
Thermal performance is defined by RθJA = 55°C/W and RθJC = 10°C/W, supporting continuous operation up to TJ = 150°C. The DO-214AB package provides 200A non-repetitive forward surge capability and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin below system rail (e.g., 48V nominal bus) |
| VBR min/max | 47.8 / 58.4 V @ 1 mA - Confirmed breakdown range ensures reliable turn-on without premature conduction during normal operation |
| VC @ IPPM | 76.7 V @ 20 A - Clamping voltage under 10/1000μs surge defines worst-case stress on protected ICs (e.g., MCU power pins) |
| PPK | 1500 W - Peak pulse power handling per single 1ms transient; supports automotive load-dump immunity per ISO 7637-2 |
| IR @ VWM | <1 μA - Ultra-low leakage preserves battery life in always-on systems and avoids false triggering in high-impedance sensing circuits |
| TJ max | +150 °C - Enables deployment in under-hood automotive environments and industrial enclosures without derating |
| Package | DO-214AB (SMC) - Surface-mount outline with 2.54 mm lead pitch, compatible with automated placement and reflow profiles per J-STD-020 Level 1 |
Pinout & Package
DO-214AB (SMC) package: molded epoxy case with matte tin-plated leads; cathode indicated by band marking; polarity-critical for unidirectional operation; weight ≈ 0.210 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-voltage return path; establishes clamping reference for positive transients on cathode side |
| Cathode | High-side transient input | Connected to protected line (e.g., 48V rail); conducts surge current to anode during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnection), and Pulse 3a/3b (EFT) - eliminates need for external test validation |
| Glass passivated junction | Ensures stable VBR tolerance and <1μA IR across temperature and lifetime - critical for long-term reliability in automotive ECUs |
| Sub-1ps response time | Clamps transients before propagation into sensitive analog or digital circuitry - protects high-speed CAN/LIN transceivers and ADC inputs |
| Moisture sensitivity Level 1 | No bake requirement prior to reflow; supports standard SMT assembly without process modification or moisture-induced popcorning risk |
| RoHS + halogen-free | Complies with IEC 61249-2-21 and EU RoHS directives - enables global market access and green manufacturing certification |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting 48V supply rail in BCM against alternator load dump and relay coil flyback. IC Role / Device Role / Timing Role: Unidirectional TVS placed between rail and ground to clamp transients up to ±100V. Use Value: Limits voltage seen by PMIC and MCU to ≤76.7V, preventing latch-up or gate oxide damage during ISO 7637-2 Pulse 5a events. |
Use Scenario: Safeguarding 24V digital input channels in modular PLCs from field-wiring ESD and inductive kickback. IC Role / Device Role / Timing Role: Standoff protection element on each optocoupler input, absorbing >1kV contact discharge per IEC 61000-4-2. Use Value: Maintains signal integrity with <1μA leakage at 24V, avoiding false triggering while surviving repeated 1500W surges. |
| LED Driver Power Stage | Telecom PoE Midspan Surge Protection |
Use Scenario: Shielding buck converter MOSFETs and current-sense amplifiers in outdoor LED streetlight drivers. IC Role / Device Role / Timing Role: Parallel clamping device across DC bus to absorb lightning-induced surges coupled via long cable runs. Use Value: Withstands 200A 8.3ms half-sine surge (IFSM) and clamps to 76.7V, preserving MOSFET VDS rating and sense resistor accuracy. |
Use Scenario: Front-end protection on PoE midspan PSE ports subjected to induced surges from adjacent data lines. IC Role / Device Role / Timing Role: Primary TVS on 48V PSE output, coordinated with secondary GDT or MOV for multi-stage suppression. Use Value: Fast <1ps response captures initial surge edge before slower components activate, reducing let-through energy to IEEE 802.3bt-compliant levels. |
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 SMAJ43A | Same DO-214AC (SMA) package; lower PPK (400W); VBR 47.8–52.8V; VC = 69.4V @ 22A | Lower power rating limits use to sub-automotive or low-energy industrial transients | Select SMAJ43A only where surge energy is constrained to <400W and space allows SMA footprint |
| ON Semiconductor 1.5SMC43CA | Bidirectional variant (CA suffix); identical VWM/VBR/VC specs but symmetrical clamping in both polarities | Required for AC-coupled or dual-polarity signal lines; unsuitable for DC rail protection without polarity awareness | Choose 1.5SMC43CA only when protecting bidirectional buses (e.g., RS-485) - SMCJ43C remains optimal for unidirectional 48V rails |
Compared with SMAJ43A, SMCJ43C delivers 275% higher peak power (1500W vs. 400W) for robust load-dump immunity; versus 1.5SMC43CA, it offers superior unidirectional efficiency with lower leakage and optimized cathode-anode layout for DC rail placement.
Availability
SMCJ43C is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, LED driver power stages, and telecom PoE midspan designs requiring stable component supply and full ISO 7637-2 compliance.
Supply support for SMCJ43C 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 manufacturer specializing in discrete power semiconductors, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and consumer markets.
The SMCJ series targets high-energy transient suppression in harsh environments, with design focus on ISO 7637-2 compliance, thermal robustness, and automated assembly readiness for Tier-1 automotive suppliers.
FAQ
What is the polarity configuration of SMCJ43C?
The SMCJ43C is a unidirectional TVS diode, with cathode marked by a band on the DO-214AB package. It conducts only when reverse-biased beyond its breakdown voltage, making it suitable for DC rail protection where polarity is fixed. This differs from bidirectional variants like SMCJ43CA, which protect AC or dual-polarity signals.
Does SMCJ43C meet automotive transient immunity standards?
Yes, SMCJ43C is explicitly validated to meet ISO 7637-2 requirements for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnection), and Pulse 3a/3b (electrical fast transients). Its 1500W peak power rating and 76.7V clamping voltage enable direct compliance in 12V/48V automotive subsystems without additional external components.
What is the maximum clamping voltage of SMCJ43C under surge conditions?
The SMCJ43C has a maximum clamping voltage (VC) of 76.7V at 20A peak pulse current (IPPM), tested with the standard 10/1000μs waveform. This value represents the highest voltage imposed on the protected circuit during a worst-case transient, ensuring compatibility with 80V-rated downstream components such as MOSFETs and PMICs.
Can SMCJ43C be used in place of SMCJ43A?
No - SMCJ43C and SMCJ43A are distinct variants: SMCJ43C is unidirectional with tighter VBR tolerance (47.8–58.4V), while SMCJ43A has a lower VBR range (47.8–52.8V) and same unidirectional configuration. Substitution requires verification of system-level clamping margin and surge energy profile; SMCJ43C offers higher robustness for demanding load-dump scenarios.
What is the thermal resistance specification for SMCJ43C?
The SMCJ43C has a junction-to-ambient thermal resistance (RθJA) of 55°C/W and junction-to-case resistance (RθJC) of 10°C/W, measured under standard JEDEC conditions. These values support continuous operation up to 150°C junction temperature and inform PCB copper pour sizing for thermal management in high-power transient environments.
SMCJ43C 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:
- 1
- Voltage - Reverse Standoff (Typ):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 76.7V
- Current - Peak Pulse (10/1000µs):
- 20A
- 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:
- DO-214AB (SMC)
SMCJ43C FAQ
1.How can I place an order for SMCJ43C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ43C 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 SMCJ43C reliable?
The price and inventory of SMCJ43C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ43C is usually 5 days.
3.What payment methods are accepted for SMCJ43C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ43C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ43C?
SMCJ43C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ43C 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 SMCJ43C?
For technical support, including SMCJ43C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ43C requirements.
6.How does Aetrix verify that SMCJ43C is sourced from the original manufacturer or authorized distributors?
All SMCJ43C 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 SMCJ43C meets industry standards.
7.What is the process for return or replacement of SMCJ43C?
All SMCJ43C units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ43C, 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 SMCJ43C part is unused and in its original packaging.
Return procedure for SMCJ43C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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