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Taiwan Semiconductor Corporation SMCJ45C
- Part No.:
- SMCJ45C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ45C.pdf
- Description:
- 1500W, 55.6V, 10%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:8,645
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Product details
Overview
SMCJ45C from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 45V working stand-off voltage (VWM), 50–61.1V breakdown voltage (VBR), and 80.3V maximum clamping voltage (VC) at 19A peak pulse current - designed for automotive ECU power rail protection against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMCJ45C datasheet, SMCJ45C pinout, SMCJ45C application, or SMCJ45C equivalent, this device delivers fast sub-1ps response, <1µA leakage above 10V, and robust 150°C junction operation - critical when selecting TVS components for 12V/24V automotive electronics, industrial PLC I/O protection, and DC-DC converter input surge immunity.
Technical Context
The SMCJ45C operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (50–61.1V @ 1mA), clamping transient energy within 80.3V at 19A (10/1000µs waveform). Its glass-passivated junction ensures stable breakdown and low leakage (<1µA @ 45V).
Thermally rated for 150°C max junction temperature, it features RθJA = 55°C/W and RθJC = 10°C/W, enabling reliable power dissipation in high-density PCB layouts without forced airflow - validated per JESD201 Class 2 whisker resistance and UL 94V-0 molding compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins; matches 12V/24V system rails with margin for ripple and tolerance. |
| VBR min/max | 50 / 61.1 V @ 1 mA - Confirmed avalanche onset range; ensures consistent triggering across production lots and temperature. |
| VC @ IPPM | 80.3 V @ 19 A (10/1000 µs) - Peak clamped voltage seen by protected circuit during worst-case transient; defines safe voltage ceiling for downstream ICs. |
| PPK | 1500 W - Peak pulse power handling capability; supports high-energy transients like load dump (ISO 7637-2 Pulse 5a) when combined with series impedance. |
| IR @ VWM | <1 µA - Ultra-low reverse leakage at rated stand-off; prevents measurable power loss or bias shift in always-on monitoring circuits. |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and enclosed industrial enclosures without derating. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, cathode-banded unidirectional configuration. Matte tin-plated leads, RoHS and halogen-free compliant, moisture sensitivity level 1 (per J-STD-020).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-impedance return path; forms clamping loop with cathode to shunt transient current safely to GND. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., battery feed); avalanche conduction occurs from cathode to anode when VREV > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps - Enables clamping before sensitive logic or analog circuitry experiences overvoltage stress during ESD or EFT events. |
| Glass passivated junction | Stable VBR and low IR drift over temperature and lifetime - critical for long-term reliability in automotive and industrial deployments. |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) - meets OEM-level EMC requirements. |
| DO-214AB mechanical robustness | 0.210 g weight, UL 94V-0 flammability rating, and JESD201 Class 2 whisker resistance - ensures mechanical integrity in automated SMT assembly and harsh thermal cycling. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting microcontroller GPIO and CAN transceiver power rails from load dump and alternator ripple in 12V vehicle systems. IC Role / Device Role / Timing Role: Unidirectional TVS clamp on battery-supplied VCC lines, absorbing ISO 7637-2 Pulse 5a (load dump) energy before it reaches LDOs or MCU pins. Use Value: Limits voltage excursion to ≤80.3V during 19A transients, preventing latch-up or permanent damage to 5V/3.3V logic domains downstream of filtering. | Use Scenario: Safeguarding 24V DC digital input channels against field-wiring induced surges and relay coil flyback in factory automation cabinets. IC Role / Device Role / Timing Role: Primary front-end transient suppressor placed before optocoupler input or Schmitt-trigger buffer, defining system-level surge immunity. Use Value: Clamps 1kV/40Ω ring wave transients to <80.3V within nanoseconds, preserving signal integrity and eliminating false triggering in safety-critical I/O. |
| LED Driver Power Stage | Telecom DC Power Feeds |
Use Scenario: Shielding buck controller ICs and MOSFET gates from inductive kickback during PWM dimming in high-power LED lighting systems. IC Role / Device Role / Timing Role: Parallel-connected TVS across input bulk capacitor terminals, diverting flyback energy away from switching node traces. Use Value: Withstands 1500W peak pulses while maintaining <1µA leakage at 45V - avoids standby current drain and thermal runaway in sealed luminaires. | Use Scenario: Protecting PoE-powered equipment (e.g., IP cameras, wireless APs) from lightning-induced surges on 48V DC distribution lines. IC Role / Device Role / Timing Role: First-stage suppression on DC input before DC-DC converters and hot-swap controllers, meeting IEC 61000-4-5 Level 3 requirements. Use Value: Delivers 80.3V clamping at 19A with 55°C/W thermal resistance - enables compact layout without heatsinking in space-constrained telecom modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45A | Lower PPK (600W), same VWM/VBR/VC specs, SMB package (smaller footprint, higher RθJA = 85°C/W) | Suitable only for lower-energy transients (e.g., ESD, EFT); not rated for ISO 7637-2 Pulse 1/2/3 or load dump | Select SMBJ45A only if board space is constrained and surge threat level is limited to IEC 61000-4-2/4-4 - not for automotive or industrial mains-connected inputs. |
| 1.5KE45CA | Through-hole TO-218 package, same 1500W rating, bidirectional variant (CA suffix), higher VF and larger thermal mass | Requires through-hole assembly; bidirectional conduction may interfere with DC biasing in unidirectional rails | Choose 1.5KE45CA only for legacy through-hole designs or where bidirectional clamping is explicitly required - SMCJ45C offers superior SMT manufacturability and thermal performance. |
Compared with SMBJ45A and 1.5KE45CA, the SMCJ45C uniquely balances 1500W surge capacity, SMT compatibility, and unidirectional precision clamping in a thermally optimized DO-214AB package - making it the preferred choice for new automotive and industrial designs requiring ISO 7637-2 compliance and automated assembly.
Availability
SMCJ45C is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O protection, and LED driver power stages requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for SMCJ45C 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, MOSFETs, and power management devices since 1979.
The SMCJ series belongs to TSC's high-reliability transient suppression product line, engineered specifically for automotive-grade surge immunity (ISO 7637-2), industrial EMC robustness, and AEC-Q200-ready packaging - targeting 12V/24V/48V DC systems exposed to harsh electrical environments.
FAQ
What is the polarity configuration of the SMCJ45C?
The SMCJ45C is a unidirectional TVS diode, featuring a cathode band marking on the DO-214AB package. It conducts only in reverse bias - from cathode to anode - when voltage exceeds its breakdown range (50–61.1V). This configuration protects positive DC rails without interfering with forward-biased operation, unlike bidirectional variants (e.g., SMCJ45CA) which conduct symmetrically.
Does the SMCJ45C meet automotive EMC standards?
Yes, the SMCJ45C is explicitly validated to meet ISO 7637-2 test pulses including Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling). Its 1500W peak power rating, sub-1ps response, and 80.3V clamping voltage enable compliance in automotive ECUs, body control modules, and infotainment power supplies - confirmed in Taiwan Semiconductor's S2104 datasheet.
What is the maximum clamping voltage of the SMCJ45C under surge conditions?
The SMCJ45C has a maximum clamping voltage (VC) of 80.3V at 19A peak pulse current (10/1000µs waveform), as specified in the Electrical Specifications table. This value represents the highest voltage imposed on the protected circuit during worst-case transient events - a critical parameter for ensuring downstream ICs (e.g., 5V MCUs or CAN transceivers) remain within absolute maximum ratings.
Can the SMCJ45C be used in bidirectional signal lines?
No - the SMCJ45C is unidirectional and unsuitable for AC or bidirectional signal lines. For such applications, use the bidirectional variant SMCJ45CA, which clamps symmetrically in both polarities. Using SMCJ45C on a bidirectional line would result in forward conduction during negative half-cycles, potentially damaging the diode or distorting signals.
What is the thermal resistance profile of the SMCJ45C?
The SMCJ45C 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 allow it to dissipate 1500W peak pulses without exceeding 150°C junction temperature when mounted on adequate copper area - essential for sustained reliability in automotive under-hood and industrial control cabinet environments.
SMCJ45C 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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 80.3V
- Current - Peak Pulse (10/1000µs):
- 19A
- 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)
SMCJ45C FAQ
1.How can I place an order for SMCJ45C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ45C 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 SMCJ45C reliable?
The price and inventory of SMCJ45C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ45C is usually 5 days.
3.What payment methods are accepted for SMCJ45C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ45C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ45C?
SMCJ45C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ45C 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 SMCJ45C?
For technical support, including SMCJ45C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ45C requirements.
6.How does Aetrix verify that SMCJ45C is sourced from the original manufacturer or authorized distributors?
All SMCJ45C 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 SMCJ45C meets industry standards.
7.What is the process for return or replacement of SMCJ45C?
All SMCJ45C units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ45C, 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 SMCJ45C part is unused and in its original packaging.
Return procedure for SMCJ45C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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