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Taiwan Semiconductor Corporation SMCJ20C
- Part No.:
- SMCJ20C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ20C.pdf
- Description:
- 1500W, 24.7V, 10%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:9,747
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Product details
Overview
SMCJ20C from Taiwan Semiconductor is a bidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 20V working stand-off voltage (VWM), 22.2–27.1V breakdown voltage (VBR), and 35.8V maximum clamping voltage (VC) at 43A peak pulse current - designed for automotive load-dump and ESD protection in power supply rails and I/O interfaces.
For engineers reviewing the SMCJ20C datasheet, SMCJ20C pinout, SMCJ20C application, or SMCJ20C equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, unidirectional vs. bidirectional configuration (C suffix = bidirectional), thermal derating above 25°C, and compatibility with automated SMT placement on industrial control and automotive ECUs.
Technical Context
The SMCJ20C implements a glass-passivated silicon junction optimized for fast transient suppression, achieving sub-1.0ps response from 0 V to VBR(min). Its bidirectional architecture enables symmetrical clamping in AC-coupled or floating signal paths without polarity constraints.
Rated for 1500W peak pulse power (tp = 1 ms), it sustains 200A non-repetitive forward surge (IFSM) and operates across –55°C to +150°C junction temperature range, with thermal resistance RθJA = 55°C/W and RθJC = 10°C/W - enabling reliable operation in thermally constrained PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA; defines safe DC/AC bias margin for protected circuitry. |
| VBR (min/max) | 22.2 V / 27.1 V @ IT = 1 mA - Verified breakdown threshold ensures predictable turn-on during transients; tighter tolerance than unidirectional A-suffix variants. |
| VC @ IPPM | 35.8 V @ 43 A - Clamping voltage limits downstream component stress during 10/1000 µs surge; critical for 24 V automotive system compliance. |
| PPK | 1500 W - Peak pulse power rating per 1 ms waveform (Fig.5); supports high-energy transients like ISO 7637-2 Pulse 5a (load dump). |
| IR @ VWM | <1 µA - Ultra-low reverse leakage preserves battery life in always-on systems and avoids false triggering in high-impedance sensing nodes. |
| Package | DO-214AB (SMC) - Industry-standard surface-mount outline with 0.210 g mass, UL 94V-0 molding, and matte tin-plated leads compliant with J-STD-002 solderability. |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with two coplanar terminals; cathode band absent (bidirectional symmetry); polarity not applicable; terminals are lead-free, matte tin plated, and rated for reflow soldering per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Identical electrical behavior in both directions; no orientation required during placement - simplifies layout and reduces assembly errors. |
| Case (body) | Thermal and mechanical interface | Non-electrical; provides primary heat path to PCB copper; requires adequate thermal pad area per JEDEC MO-136 guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC lines, differential buses (e.g., RS-485), and floating grounds without external polarity management. |
| ISO 7637-2 compliance | Validated against Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (switching noise) - meets OEM automotive EMC requirements. |
| Sub-1 ps response time | Clamps transients before sensitive ICs experience overvoltage - essential for protecting high-speed microcontrollers and CAN transceivers. |
| J-STD-020 Level 1 moisture sensitivity | Zero bake requirement prior to reflow; supports standard SMT processes without special handling or dry-pack logistics. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU - suitable for green manufacturing and export to regulated markets. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protects 24 V supply rail and sensor inputs in BCM against load-dump surges (ISO 7637-2 Pulse 5a) and ESD events from user interfaces. IC Role / Device Role / Timing Role: Primary transient shunt device placed at board-level input filter stage, upstream of DC-DC converters and microcontroller power domains. Use Value: Limits clamped voltage to 35.8 V - well below 40 V absolute max rating of common 3.3 V/5 V LDOs and MCU I/O pins, preventing latch-up or permanent damage. |
Use Scenario: Shields 24 V digital input channels from inductive kickback when interfacing with solenoids, relays, and motor contactors in factory automation. IC Role / Device Role / Timing Role: Standalone TVS mounted directly at terminal block entry point, providing first-line defense before optocoupler or Schmitt-trigger input conditioning. Use Value: Withstands 200 A single-half-sine surge (IFSM) and clamps 43 A transients to ≤35.8 V - ensuring signal integrity and eliminating false triggers during heavy-inductive switching. |
| LED Streetlight Power Supply | RS-485 Communication Port |
Use Scenario: Safeguards AC-DC PFC stage and secondary-side 48 V bus against lightning-induced surges and grid switching transients in outdoor lighting. IC Role / Device Role / Timing Role: Bidirectional TVS placed across bulk capacitor terminals and across output rails to absorb differential-mode energy from long cable runs. Use Value: 1500 W peak power rating handles multi-kV surge events per IEC 61000-4-5; symmetric clamping prevents reverse-bias overstress on electrolytic capacitors. |
Use Scenario: Protects half-duplex RS-485 transceivers (e.g., SN65HVD230) connected to field wiring exposed to EFT and ESD in building automation networks. IC Role / Device Role / Timing Role: Common-mode TVS across A/B lines and differential TVS between A/B and GND - leverages bidirectional symmetry for balanced line protection. Use Value: Sub-1 ps response captures fast ESD pulses before transceiver internal clamps activate; low IR avoids loading 120 Ω termination impedance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20C (Bourns) | Same DO-214AA (SMB) package; lower PPK = 600 W; VBR = 22.2–25.6 V; VC = 32.4 V @ 18.5 A. | Lower surge capacity suits cost-sensitive consumer electronics but insufficient for ISO 7637-2 Pulse 5a automotive use. | Select SMCJ20C when 1500 W peak power and 24 V system compliance are mandatory; SMBJ20C only where space or cost constraints override energy-handling needs. |
| P6SMB20C (Littelfuse) | DO-214AA (SMB) package; PPK = 600 W; VBR = 22.2–25.6 V; VC = 32.4 V @ 18.5 A; meets AEC-Q101. | AEC-Q101 qualified but lower energy rating; lacks explicit ISO 7637-2 validation in datasheet. | Choose P6SMB20C only if automotive qualification is prioritized over surge energy; SMCJ20C offers higher robustness for harsh environments without certification overhead. |
Compared with SMBJ20C and P6SMB20C, the SMCJ20C delivers 2.5× higher peak pulse power in the larger DO-214AB package - enabling longer transient absorption time and lower thermal stress in 24 V industrial and automotive systems where sustained surge energy is critical.
Availability
SMCJ20C is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, LED driver power supplies, and RS-485 communication interfaces requiring stable component supply and full ISO 7637-2 compliance.
Supply support for SMCJ20C 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-power surface-mount TVS platform, engineered specifically for automotive, industrial, and telecom infrastructure applications demanding robust transient immunity and AEC-Q200-aligned reliability.
FAQ
What does the 'C' suffix indicate in SMCJ20C?
The 'C' suffix in SMCJ20C denotes a bidirectional configuration - meaning the device provides symmetrical clamping in both polarities, with identical VBR, VC, and IPPM characteristics in either direction. This eliminates polarity marking during PCB layout and enables protection of AC-coupled or floating signal paths without external diode pairing. The SMCJ20C is functionally distinct from unidirectional SMCJ20A.
Does SMCJ20C meet ISO 7637-2 for automotive applications?
Yes, the SMCJ20C is explicitly validated to meet ISO 7637-2 test pulses 1, 2a, 2b, 3a, and 3b per its datasheet. It is rated for 1500 W peak pulse power and clamps 43 A transients to 35.8 V, making it suitable for 12 V/24 V automotive subsystems including body control modules and infotainment power rails - though it is not AEC-Q200 qualified by default.
What is the maximum clamping voltage of SMCJ20C and why does it matter?
The SMCJ20C has a maximum clamping voltage (VC) of 35.8 V at 43 A peak pulse current (10/1000 µs waveform). This value defines the highest voltage imposed on protected circuitry during a surge event. For 24 V systems, keeping VC below 40 V ensures compatibility with common 3.3 V/5 V logic interfaces and prevents overvoltage damage to downstream regulators and microcontrollers.
Can SMCJ20C be used in place of SMCJ20A?
No - SMCJ20C and SMCJ20A are not interchangeable. SMCJ20C is bidirectional with symmetrical characteristics; SMCJ20A is unidirectional and requires correct cathode orientation. Substituting one for the other risks open-circuit failure under reverse transients or unintended conduction in AC paths. Always match the suffix: 'C' for bidirectional, 'A' for unidirectional.
What is the thermal resistance and how does it affect PCB layout for SMCJ20C?
The SMCJ20C has a junction-to-ambient thermal resistance (RθJA) of 55°C/W and junction-to-case (RθJC) of 10°C/W. To maintain TJ ≤ 150°C under 1500 W surge, the PCB must provide sufficient copper area (≥ 100 mm² per pad recommended) and thermal vias to inner ground planes. Poor thermal design causes premature thermal runaway during repetitive surges.
SMCJ20C 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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 35.8V
- Current - Peak Pulse (10/1000µs):
- 43A
- 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)
SMCJ20C FAQ
1.How can I place an order for SMCJ20C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ20C 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 SMCJ20C reliable?
The price and inventory of SMCJ20C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ20C is usually 5 days.
3.What payment methods are accepted for SMCJ20C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ20C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ20C?
SMCJ20C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ20C 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 SMCJ20C?
For technical support, including SMCJ20C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ20C requirements.
6.How does Aetrix verify that SMCJ20C is sourced from the original manufacturer or authorized distributors?
All SMCJ20C 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 SMCJ20C meets industry standards.
7.What is the process for return or replacement of SMCJ20C?
All SMCJ20C units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ20C, 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 SMCJ20C part is unused and in its original packaging.
Return procedure for SMCJ20C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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