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Taiwan Semiconductor Corporation SMCJ20
- Part No.:
- SMCJ20
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ20.pdf
- Description:
- 1500W, 24.7V, 10%, UNIDIRECTIONA
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SMCJ20 from Taiwan Semiconductor is a unidirectional 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 @ 1mA), and 35.8V maximum clamping voltage (VC @ 43A). It protects automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMCJ20 datasheet, SMCJ20 pinout, SMCJ20 application, or SMCJ20 equivalent, this device delivers fast sub-1ps response, <1μA reverse leakage above 10V, and robust 150°C junction operation - critical for ESD and load-dump protection in DC power systems, LED drivers, and automotive ECUs.
Technical Context
The SMCJ20 operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its VBR range (22.2–27.1V) to clamp transients within 35.8V at 43A peak impulse current. Its glass-passivated junction ensures stable breakdown and low leakage (<1μA @ 20V).
Thermally, it features RθJA = 55°C/W and RθJC = 10°C/W, enabling reliable 5W steady-state dissipation at 25°C ambient. It meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability standards in its molded DO-214AB case.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 22.2 V / 27.1 V @ 1 mA - Confirmed avalanche onset range for reliable trigger margin |
| VC @ IPPM | 35.8 V @ 43 A - Clamped voltage during 10/1000μs surge, limiting downstream stress |
| PPK | 1500 W - Peak pulse power handling per single 1ms transient per Fig.5 |
| IR @ VWM | <1 μA - Minimal leakage at rated stand-off, preserving system efficiency |
| TJ max | +150 °C - Enables operation in under-hood automotive environments |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with cathode band marking |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band on one end. Weight ≈ 0.210 g. Complies with J-STD-002 solderability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or low-side return path in unidirectional configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 24V rail); conducts during overvoltage to shunt energy to ground |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (ESD/coupled noise) |
| Sub-1ps response time | Clamps transients before sensitive ICs experience overstress - critical for CAN/LIN bus protection |
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive - suitable for automotive Tier-1 supply chain requirements |
Applications
| Automotive Power Rail Protection | Industrial DC Power Supply Input |
|---|---|
Use Scenario: Protecting 24V battery-fed ECUs from load-dump transients up to 120V per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp surges before they reach LDOs or microcontrollers. Use Value: Limits clamped voltage to 35.8V at 43A, preventing damage to 36V-rated input stages without derating headroom. |
Use Scenario: Safeguarding programmable logic controller (PLC) 24V DC inputs against inductive kickback from solenoid switching. IC Role / Device Role / Timing Role: Standoff protector on field-side power entry, absorbing repetitive 1500W pulses without degradation. Use Value: Withstands >1000 surges at rated PPK while maintaining <1μA leakage - preserves signal integrity in analog sensor front-ends. |
| LED Driver Output Protection | Telecom DC Feeder Line Protection |
Use Scenario: Shielding constant-current LED driver outputs from accidental short-circuit recovery spikes and cable ESD events. IC Role / Device Role / Timing Role: Fast-clamping TVS across output terminals to prevent latch-up in driver ICs during fault recovery. Use Value: Sub-1ps response ensures clamping initiates before driver's internal FETs sustain avalanche failure during 10/1000μs transients. |
Use Scenario: Guarding PoE-powered equipment (e.g., IP cameras) against lightning-induced surges on 48V DC feeder lines. IC Role / Device Role / Timing Role: Primary-level surge suppression ahead of DC-DC converter input stage. Use Value: 1500W rating handles high-energy induced surges; DO-214AB footprint enables compact layout with minimal trace inductance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20A | Lower PPK (600W), smaller SMB package (DO-214AA), tighter VBR tolerance (22.2–24.5V) | Not suitable for ISO 7637-2 Pulse 5a load-dump; limited to lower-energy transients | Select when board space is constrained and surge energy ≤600W suffices |
| 1.5KE20A | Through-hole TO-218 package, same 20V VWM but higher VC (40.5V @ 37.1A), slower response (~1ps) | Requires PCB mounting hole; unsuitable for automated SMT assembly | Choose only for legacy through-hole designs where rework to SMT is not feasible |
Compared with SMBJ20A and 1.5KE20A, the SMCJ20 provides 2.5× higher surge power rating in an SMT-optimized package with verified ISO 7637-2 compliance - making it the preferred choice for new automotive and industrial designs requiring robust, automated, and space-efficient transient protection.
Availability
SMCJ20 is available at Aetrix Electronics and suitable for automotive ECU protection, industrial PLC power inputs, LED driver output safeguarding, and telecom DC feeder line surge suppression requiring stable component supply across production lifecycles.
Supply support for SMCJ20 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and consumer markets.
The SMCJ series was designed specifically for high-energy transient suppression in harsh environments - targeting ISO 7637-2 compliance, AEC-Q101 readiness, and SMT manufacturability in DO-214AB packaging.
FAQ
What is the maximum clamping voltage of the SMCJ20 under standard test conditions?
The SMCJ20 has a maximum clamping voltage (VC) of 35.8 V when subjected to a 10/1000 μs surge waveform at its rated peak pulse current of 43 A. This value is measured per IEC 61000-4-5 and ANSI/IEEE C62.35 standards, ensuring predictable voltage limiting during real-world transients like load dump or ESD events. The SMCJ20 maintains this clamping performance across its full operating temperature range of –55°C to +150°C.
Is the SMCJ20 unidirectional or bidirectional, and how is polarity identified?
The SMCJ20 is a unidirectional TVS diode, intended for DC line protection where reverse voltage is blocked and only positive transients are clamped to ground. Polarity is marked by a cathode band on the DO-214AB package - the banded end connects to the protected line (e.g., 24V rail), while the unbanded end connects to ground. Bidirectional variants use "C" or "CA" suffixes (e.g., SMCJ20C), which are distinct part numbers not interchangeable with SMCJ20.
Does the SMCJ20 meet automotive transient immunity standards?
Yes, the SMCJ20 meets ISO 7637-2 requirements for Pulse 1 (inductive switch-off), Pulse 2a (battery disconnect), Pulse 2b (alternator load dump simulation), and Pulses 3a/3b (capacitive coupling and ESD). Its 1500W peak power rating, fast sub-1ps response, and validated clamping behavior make it suitable for front-end protection in automotive control units, body electronics, and ADAS modules per AEC-Q101 stress test guidelines.
What is the reverse leakage current specification for the SMCJ20 at its working voltage?
The SMCJ20 exhibits a maximum reverse leakage current (IR) of less than 1 μA when biased at its 20 V working stand-off voltage (VWM) and tested at 25°C. This ultra-low leakage preserves system efficiency in always-on circuits and avoids false triggering in high-impedance monitoring paths. Leakage remains below 5 μA up to 80% of VWM, supporting stable operation in battery-backed or low-power IoT nodes.
Can the SMCJ20 be used in parallel for higher surge current handling?
No - the SMCJ20 is not recommended for parallel operation due to inherent VBR mismatch between units, which causes uneven current sharing and potential thermal runaway. For higher surge capability, select a higher-rated device (e.g., SMCJ22 or SMCJ24) or implement staged protection with upstream fusing and coordinated clamping. Taiwan Semiconductor specifies single-device usage only; parallel configurations require derating validation per application note AN-1021.
SMCJ20 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMCJ20 FAQ
1.How can I place an order for SMCJ20 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ20 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 SMCJ20 reliable?
The price and inventory of SMCJ20 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ20 is usually 5 days.
3.What payment methods are accepted for SMCJ20?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ20 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ20?
SMCJ20 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ20 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 SMCJ20?
For technical support, including SMCJ20 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ20 requirements.
6.How does Aetrix verify that SMCJ20 is sourced from the original manufacturer or authorized distributors?
All SMCJ20 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 SMCJ20 meets industry standards.
7.What is the process for return or replacement of SMCJ20?
All SMCJ20 units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ20, 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 SMCJ20 part is unused and in its original packaging.
Return procedure for SMCJ20:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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