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Taiwan Semiconductor Corporation SMCJ20CH
- Part No.:
- SMCJ20CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ20CH.pdf
- Description:
- 1500W, 24.7V, 10%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:8,766
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Product details
Overview
SMCJ20CH from Taiwan Semiconductor is a bidirectional 1500W surface-mount transient voltage suppressor (TVS) in DO-214AB (SMC) package, with 22.2V min / 27.1V max breakdown voltage (VBR), 20V working stand-off voltage (VWM), and 35.8V maximum clamping voltage (VC) at 43A peak pulse current. It delivers AEC-Q101 qualification and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump and ESD protection in power line interfaces.
For engineers reviewing the SMCJ20CH datasheet, SMCJ20CH pinout, SMCJ20CH application, or SMCJ20CH equivalent, key selection considerations include its bidirectional configuration (CH suffix), 1500W peak pulse power rating, sub-1ps response time, <1µA leakage above 10V, and compliance with automotive transients per ISO 7637-2 - critical for CAN bus front-end, infotainment power rails, and ADAS sensor supply lines.
Technical Context
The SMCJ20CH uses a glass-passivated silicon junction optimized for fast transient suppression, with clamping action triggered when reverse voltage exceeds VBR = 22.2–27.1V at IT = 1mA. Its bidirectional design enables symmetrical protection on AC-coupled or floating signal/power lines without polarity dependency.
Thermal performance is defined by RθJA = 55°C/W and RθJC = 10°C/W, supporting reliable operation up to TJ = +150°C. It sustains 200A non-repetitive forward surge (IFSM) and exhibits <3.5V forward voltage only in unidirectional variants - not applicable to SMCJ20CH due to its CH-suffix bipolar construction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC/AC RMS operating margin. |
| VBR @ IT=1mA | 22.2V min / 27.1V max - Breakdown threshold range; ensures consistent turn-on across production lots under standardized test conditions. |
| VC @ IPPM=43A | 35.8V - Clamped voltage during 10/1000μs surge; determines maximum stress imposed on downstream ICs during transient events. |
| PPK | 1500W - Peak pulse power handling per single 1ms waveform; supports high-energy surges such as ISO 7637-2 Pulse 5a (load dump). |
| IR @ VWM | <1µA - Reverse leakage at rated stand-off voltage; minimizes standby power loss and avoids false triggering in low-current circuits. |
| Response Time | <1.0ps - Junction switching speed from 0V to VBR; ensures suppression activation prior to damage onset in ESD and lightning-induced transients. |
| Package | DO-214AB (SMC) - Industry-standard surface-mount outline with 7.11mm x 6.22mm footprint and 2.3mm height; compatible with automated pick-and-place and reflow. |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (not functional in bidirectional SMCJ20CH). Weight ≈ 0.210g. Meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional transient conduction path | No functional polarity - terminals interchangeable; clamps voltage excursions in either direction above ±VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood and cabin applications per stress-test requirements including temperature cycling, HTRB, and ESD. |
| ISO 7637-2 compliant | Withstands Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) without degradation. |
| Glass passivated junction | Enhances long-term reliability and moisture resistance vs. epoxy-passivated alternatives; supports >10-year field life in humid environments. |
| Fast response & low leakage | <1ps turn-on and <1µA IR ensure minimal interference with signal integrity and negligible quiescent current draw in always-on systems. |
| 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 Power Line Protection | CAN Bus Transient Suppression |
|---|---|
|
Use Scenario: Protecting 12V battery-fed ECUs (e.g., body control modules, lighting drivers) against load dump and jump-start surges per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of DC-DC converters and LDO regulators. Use Value: Limits input rail to ≤35.8V during 1500W transients, preventing damage to 40V-rated power management ICs and enabling robust system-level EMC compliance. |
Use Scenario: Safeguarding high-speed CAN FD transceivers (e.g., TCAN1042, SN65HVD256) against ESD and coupled noise on differential bus lines. IC Role / Device Role / Timing Role: Bidirectional TVS placed across CAN_H/CAN_L pair, referenced to ground via low-inductance layout. Use Value: Clamps common-mode transients to <36V while preserving signal integrity - critical for maintaining >5Mbps CAN FD timing margins and error-free arbitration. |
| Industrial Sensor Interface Protection | Consumer Power Adapter Input Stage |
|
Use Scenario: Shielding analog front-ends of pressure/temperature sensors in factory automation equipment exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Secondary protection device after primary MOV or gas discharge tube, located adjacent to sensor IC input pins. Use Value: Sub-1ps response captures fast-rising edge transients (<10ns) that bypass slower protectors, reducing ADC offset drift and calibration drift in precision measurement systems. |
Use Scenario: Securing AC-DC adapter primary-side rectifier output against lightning-induced surges entering via mains input per IEC 61000-4-5 Level 3. IC Role / Device Role / Timing Role: Standoff-rated TVS shunting bulk capacitor charging node during surge events. Use Value: Withstands 1500W pulses without thermal runaway, eliminating need for derating or parallel devices - simplifies BOM and improves adapter MTBF. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20CA (Bourns) | Same DO-214AA (SMB) package, 20V VWM, but lower PPK = 600W and higher VC = 32.4V @ 18.5A. | Not suitable for ISO 7637-2 Pulse 5a; limited to lower-energy transients like ESD or telecom surges. | Select SMBJ20CA only if space constraints require smaller SMB footprint and surge energy is confirmed ≤600W. |
| 1.5KE20CA (ON Semiconductor) | Through-hole DO-201AE package, same VWM/VBR specs, but PPK = 1500W and VC = 36.0V @ 41.7A; no AEC-Q101 qualification. | Lacks automotive qualification and surface-mount compatibility; requires wave solder or hand assembly. | Choose 1.5KE20CA for cost-sensitive industrial designs where AEC-Q101 is not mandated and PCB real estate allows through-hole placement. |
Compared with SMBJ20CA and 1.5KE20CA, the SMCJ20CH uniquely combines AEC-Q101 qualification, 1500W DO-214AB packaging, and ISO 7637-2 compliance - making it the only drop-in solution for automotive-grade SMT power rail protection requiring full load-dump immunity.
Availability
SMCJ20CH is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and consumer power adapter designs requiring stable component supply with guaranteed long-term manufacturability.
Supply support for SMCJ20CH 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 validation capability.
The SMCJ series was engineered specifically for high-reliability automotive and industrial transient suppression, emphasizing robust clamping consistency, low leakage, and full ISO 7637-2 compliance across voltage grades.
FAQ
What does the "CH" suffix indicate in SMCJ20CH?
The "CH" suffix denotes a bidirectional configuration - meaning the SMCJ20CH provides symmetrical transient suppression in both polarities, with identical VBR, VC, and IPPM characteristics regardless of voltage polarity. This eliminates the need for polarity-aware layout and makes it ideal for AC-coupled lines like CAN bus or differential sensor outputs.
Is SMCJ20CH qualified for automotive use?
Yes, the SMCJ20CH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity standards. Its glass-passivated junction, halogen-free construction, and 150°C maximum junction temperature support deployment in engine control units, ADAS modules, and infotainment systems.
What is the maximum clamping voltage of SMCJ20CH under surge conditions?
The SMCJ20CH has a maximum clamping voltage (VC) of 35.8V at 43A peak pulse current (IPPM) using the standard 10/1000μs waveform. This value is guaranteed across temperature and lifetime, ensuring downstream components see no more than 35.8V during worst-case transients.
Can SMCJ20CH replace unidirectional SMCJ20H in an existing design?
No - the SMCJ20CH is bidirectional while SMCJ20H is unidirectional. Replacing SMCJ20H with SMCJ20CH may cause unintended conduction in DC-biased circuits. Use SMCJ20CH only where true bidirectional protection is required; for DC rails, retain SMCJ20H or select SMCJ20AH for tighter VBR tolerance.
What is the thermal resistance of SMCJ20CH, and how does it affect PCB layout?
The SMCJ20CH has RθJA = 55°C/W and RθJC = 10°C/W. To maintain TJ ≤150°C under 1500W pulses, PCB copper area must provide adequate heat spreading - recommend ≥100mm² of 2oz copper connected to both terminals, with thermal vias to inner layers if multilayer.
SMCJ20CH 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ20CH FAQ
1.How can I place an order for SMCJ20CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ20CH 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 SMCJ20CH reliable?
The price and inventory of SMCJ20CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ20CH is usually 5 days.
3.What payment methods are accepted for SMCJ20CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ20CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ20CH?
SMCJ20CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ20CH 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 SMCJ20CH?
For technical support, including SMCJ20CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ20CH requirements.
6.How does Aetrix verify that SMCJ20CH is sourced from the original manufacturer or authorized distributors?
All SMCJ20CH 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 SMCJ20CH meets industry standards.
7.What is the process for return or replacement of SMCJ20CH?
All SMCJ20CH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ20CH, 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 SMCJ20CH part is unused and in its original packaging.
Return procedure for SMCJ20CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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