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Vishay General Semiconductor - Diodes Division SMCJ20A-E3/57T
- Part No.:
- SMCJ20A-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ20A-E3/57T.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,990
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Product details
Overview
SMCJ20A-E3/57T from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed to protect sensitive electronics against ESD and surge transients. It features a 20 V stand-off voltage (VWM), 32.4 V maximum clamping voltage at 46.3 A peak pulse current (10/1000 μs), and 1500 W peak pulse power dissipation - used for safeguarding MOSFETs, ICs, and sensor signal lines in automotive and industrial power supplies.
For engineers reviewing the SMCJ20A-E3/57T datasheet, SMCJ20A-E3/57T pinout, SMCJ20A-E3/57T application, or SMCJ20A-E3/57T equivalent, key selection criteria include unidirectional polarity, 22.2–24.5 V breakdown voltage range at 1 mA test current, junction temperature rating up to +150 °C, and RoHS-compliant matte tin-plated leads meeting J-STD-002 solderability standards.
Technical Context
The SMCJ20A-E3/57T operates as a silicon avalanche diode with glass-passivated junction, delivering fast response time (<1 ns) and low incremental surge resistance to clamp transient overvoltages before they damage downstream circuitry. Its unidirectional configuration uses cathode-band marking and exhibits forward voltage of 3.5 V at 100 A surge current.
Thermally, it has a typical junction-to-ambient thermal resistance of 75 °C/W on standard 8.0 mm × 8.0 mm copper pads and meets MSL Level 1 per J-STD-020 with peak reflow temperature of 260 °C. It is rated for operating junction temperatures from –55 °C to +150 °C and supports non-repetitive surge pulses per IEC 61000-4-5 and ANSI/IEEE C62.35 standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - maximum continuous reverse working voltage before clamping begins |
| VBR min/max | 22.2 V / 24.5 V at IT = 1 mA - ensures reliable avalanche initiation within defined tolerance |
| VC @ IPPM | 32.4 V at 46.3 A (10/1000 μs) - limits voltage seen by protected IC during worst-case surge |
| PPPM | 1500 W - peak transient energy absorption capability under standardized surge waveform |
| ID @ VWM | 1.0 μA - ultra-low leakage preserves signal integrity in high-impedance circuits |
| TJ max | +150 °C - enables use in under-hood automotive and industrial environments |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint |
Pinout & Package
SMCJ20A-E3/57T uses the SMC (DO-214AB) package: molded epoxy case with matte tin-plated leads, 0.320" (8.13 mm) overall length, 0.246" (6.22 mm) width, and cathode band marking on one end. Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal per Vishay's recommended layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection in reverse-biased protection path | Connected to protected line (e.g., VBUS or signal); clamps when voltage exceeds VWM |
| Anode (non-banded end) | Reference/ground return path | Typically tied to system ground or low-impedance return plane to complete clamping loop |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMC package | Enables automated placement and fits tight board spaces without height interference |
| Glass-passivated junction | Ensures stable breakdown characteristics and long-term reliability under repeated surges |
| 1500 W peak pulse power | Handles high-energy transients from inductive load switching and lightning-induced surges |
| AEC-Q101 qualification option | HE3/HM3 variants available for automotive-grade designs requiring stress-tested reliability |
| MSL Level 1 rating | Allows single-reflow assembly without moisture sensitivity concerns or baking requirements |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 24 V supply rails in engine control units (ECUs) and body control modules from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC input to clamp transients before regulator stage. Use Value: Limits voltage to ≤32.4 V during 1500 W surges, preventing latch-up or destruction of downstream PMICs and microcontrollers. | Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loops) of pressure/temperature sensors in factory automation systems. IC Role / Device Role / Timing Role: TVS connected across signal and ground to absorb ESD events and cable discharge transients. Use Value: Sub-μA leakage at 20 V preserves accuracy of high-impedance sensor interfaces while clamping >8 kV HBM ESD. |
| Consumer USB Port Surge Suppression | Telecom DC Power Input Protection |
Use Scenario: Safeguarding USB Type-C VBUS lines in portable docking stations exposed to hot-plug and cable-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS installed between VBUS and GND to shunt overvoltage before USB controller or PD chip. Use Value: 32.4 V clamping ensures compliance with USB PD 3.0 voltage tolerance while surviving 10/1000 μs surges up to 46.3 A. | Use Scenario: Protecting -48 V DC telecom power inputs against lightning-induced surges on outdoor cabinet feeds. IC Role / Device Role / Timing Role: TVS deployed across input terminals of DC-DC converters powering base station radios. Use Value: 1500 W rating handles high-energy common-mode surges; 150 °C TJ rating sustains operation in sealed, high-temp enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20A-E3/52T | Lower PPPM (600 W), smaller SMB (DO-214AA) package, same VWM/VBR/VC specs | Reduced surge handling; suitable only for lower-energy threats or space-constrained layouts | Select when board area is critical and surge threat level is ≤600 W |
| SMCJ20CA-E3/57T | Bidirectional variant; identical VWM (20 V), symmetric clamping in both polarities | Required for AC-coupled or floating signal lines where polarity reversal may occur | Choose for differential data lines (e.g., RS-485) or ungrounded sensor outputs |
Compared with SMBJ20A-E3/52T and SMCJ20CA-E3/57T, the SMCJ20A-E3/57T delivers higher surge robustness in a standardized SMC footprint while maintaining unidirectional optimization for DC rail protection - making it optimal for automotive and industrial 20 V system interfaces where peak energy and thermal margin are prioritized.
Availability
SMCJ20A-E3/57T is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, consumer USB power delivery systems, and telecom DC input stages requiring stable component supply and full traceability.
Supply support for SMCJ20A-E3/57T 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific performance.
The SMCJ series is part of Vishay's TRANSZORB® TVS portfolio, engineered specifically for high-power transient suppression in harsh environments including automotive, industrial, and telecom infrastructure.
FAQ
What is the breakdown voltage range of the SMCJ20A-E3/57T?
The SMCJ20A-E3/57T has a guaranteed breakdown voltage (VBR) range of 22.2 V to 24.5 V at a test current of 1 mA, measured per ANSI/IEEE C62.35. This range ensures consistent avalanche initiation across production lots and supports robust design margins for 20 V nominal systems. The SMCJ20A-E3/57T maintains this specification across its full operating temperature range.
Is the SMCJ20A-E3/57T RoHS-compliant and lead-free?
Yes, the SMCJ20A-E3/57T carries the "E3" suffix indicating full RoHS compliance and commercial-grade qualification. Its matte tin-plated leads meet J-STD-002 solderability requirements and JESD 201 Class 2 whisker resistance. The device contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE, and conforms to EU Directive 2011/65/EU.
Can the SMCJ20A-E3/57T be used in automotive applications?
The standard SMCJ20A-E3/57T is commercial-grade, but Vishay offers AEC-Q101 qualified versions under ordering codes like SMCJ20AHE3_A/H. These variants undergo stress testing for temperature cycling, humidity, and mechanical shock, making them suitable for under-hood and chassis-mounted automotive modules. The SMCJ20A-E3/57T itself is widely used in non-safety-critical automotive subsystems where qualification is not mandated.
What is the maximum clamping voltage of the SMCJ20A-E3/57T during a surge event?
The SMCJ20A-E3/57T has a maximum clamping voltage (VC) of 32.4 V at 46.3 A peak pulse current using the standardized 10/1000 μs waveform. This value represents the highest voltage imposed on protected circuitry during worst-case surge conditions and is verified per JEDEC test methods. The SMCJ20A-E3/57T achieves this with low incremental resistance, minimizing overshoot beyond VC.
How does the SMCJ20A-E3/57T compare to bidirectional TVS diodes like SMCJ20CA-E3/57T?
The SMCJ20A-E3/57T is unidirectional and optimized for DC rail protection where polarity is fixed; the SMCJ20CA-E3/57T is bidirectional with symmetrical clamping in both directions, required for AC signals or floating lines. Both share identical VWM (20 V), PPPM (1500 W), and package, but the SMCJ20A-E3/57T offers lower leakage and avoids unnecessary conduction during normal negative excursions - a key advantage in DC power paths.
SMCJ20A-E3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- 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:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 46.3A
- 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 (SMCJ)
SMCJ20A-E3/57T FAQ
1.How can I place an order for SMCJ20A-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ20A-E3/57T 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 SMCJ20A-E3/57T reliable?
The price and inventory of SMCJ20A-E3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ20A-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ20A-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ20A-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ20A-E3/57T?
SMCJ20A-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ20A-E3/57T 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 SMCJ20A-E3/57T?
For technical support, including SMCJ20A-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ20A-E3/57T requirements.
6.How does Aetrix verify that SMCJ20A-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ20A-E3/57T 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 SMCJ20A-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ20A-E3/57T?
All SMCJ20A-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ20A-E3/57T, 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 SMCJ20A-E3/57T part is unused and in its original packaging.
Return procedure for SMCJ20A-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ20A-E3/57T Tags
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