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Vishay General Semiconductor - Diodes Division SMCJ18A-M3/57T
- Part No.:
- SMCJ18A-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ18A-M3/57T.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,668
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Product details
Overview
SMCJ18A-M3/57T from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, with 18 V standoff voltage (VWM), 29.2 V maximum clamping voltage (VC) at 51.4 A peak pulse current, and 1500 W peak pulse power rating (10/1000 µs waveform). It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients and ESD in automotive and industrial power supplies.
For engineers reviewing the SMCJ18A-M3/57T datasheet, SMCJ18A-M3/57T pinout, SMCJ18A-M3/57T application, or SMCJ18A-M3/57T equivalent, key selection criteria include clamping performance under 10/1000 µs surge, thermal resistance (RθJA = 75 °C/W), halogen-free RoHS compliance (M3 suffix), and unidirectional polarity marking for cathode identification on PCB layout.
Technical Context
The SMCJ18A-M3/57T uses a glass-passivated silicon junction to achieve fast response time (<1 ps) and low incremental surge resistance, enabling effective suppression of sub-microsecond transients. Its breakdown voltage range (20.0–22.1 V at 1 mA test current) ensures reliable triggering above normal operating voltage while maintaining low leakage (<1.0 µA at 18 V).
Designed for surface-mount automated placement, it meets J-STD-020 MSL Level 1 and JESD 201 Class 2 whisker resistance requirements. The SMC (DO-214AB) package supports 0.31" × 0.31" copper pad layout per Vishay's recommended mounting footprint for optimal thermal dissipation and 1500 W surge handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Standoff) | 18 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (Min/Max) | 20.0 V / 22.1 V at 1 mA - Ensures consistent turn-on margin above VWM across production lot |
| VC @ IPPM | 29.2 V at 51.4 A - Clamping voltage limits downstream device stress during 10/1000 µs surge |
| PPPM | 1500 W - Peak pulse power handling capability defines transient energy absorption capacity |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance determines derating above 25 °C ambient |
| TJ max | +150 °C - Maximum junction temperature enables operation in under-hood automotive environments |
| Leakage @ VWM | <1.0 µA - Low reverse leakage preserves signal integrity and minimizes standby power loss |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant (M3 suffix), matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity marked with cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional protection configuration |
| Cathode | Reverse-biased clamping terminal | Marked with band; connected to protected line (e.g., 12 V rail or sensor input) to clamp positive transients |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMC package | Enables high-density PCB layouts and compatibility with standard SMT pick-and-place equipment |
| Glass-passivated junction | Improves long-term reliability and stability of breakdown voltage under thermal cycling and humidity |
| 1500 W peak pulse power | Supports robust protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surge events |
| Halogen-free (M3) | Meets environmental compliance requirements for automotive and industrial end equipment without compromising flame retardancy (UL 94 V-0) |
| AEC-Q101 qualification option | Available in HM3 variant for automotive-grade applications requiring validated reliability testing |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp positive surges above 20 V. Use Value: Limits voltage seen by downstream DC/DC converters and microcontrollers to ≤29.2 V during 1500 W surges, preventing latch-up or overvoltage damage. | Use Scenario: Shielding analog outputs of pressure/temperature sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: TVS mounted directly at connector entry point to shunt fast transients before reaching precision amplifier inputs. Use Value: Sub-nanosecond response and <1 µA leakage preserve signal accuracy while absorbing >15 kV HBM ESD pulses per IEC 61000-4-2. |
| Consumer Power Adapter Input Stage | Telecom Line Card Surge Protection |
Use Scenario: Safeguarding AC-DC adapter primary-side rectifier and controller ICs from lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed across bulk capacitor input to clamp differential-mode transients. Use Value: 29.2 V clamping prevents overvoltage stress on 30 V-rated MOSFETs and controllers during 10/1000 µs line surges. | Use Scenario: Protecting Ethernet PHY interface circuits from induced surges on RJ45 ports in PoE-powered switches. IC Role / Device Role / Timing Role: TVS array configured with SMCJ18A-M3/57T on each data pair to clamp common-mode transients. Use Value: 1500 W rating and low Rsurge ensure compliance with GR-1089-CORE Level 3 (4 kV/2 Ω) telecom surge immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A-M3 | Lower PPPM (600 W), same VWM/VC, SMB (DO-214AA) package | Reduced surge margin; suitable only for lower-energy transients (e.g., IEC 61000-4-2 ESD) | Select when space constraints require smaller footprint and surge threat level is below 1500 W. |
| SMCJ18CA-M3 | Bidirectional version; identical VWM, VC, and PPPM; no polarity marking | Required for AC-coupled or dual-polarity signal lines (e.g., RS-485, CAN bus) | Choose for symmetric transient protection where both positive and negative excursions must be clamped. |
Compared with SMBJ18A-M3, the SMCJ18A-M3/57T delivers 2.5× higher surge power handling in the same mounting height but requires larger PCB area; versus SMCJ18CA-M3, it provides optimized unidirectional clamping with cathode identification for DC rail protection, avoiding unnecessary bidirectional capacitance in single-polarity systems.
Availability
SMCJ18A-M3/57T is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, and consumer power adapter input stage applications requiring stable component supply, halogen-free compliance, and AEC-Q101-qualified alternatives.
Supply support for SMCJ18A-M3/57T 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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on reliability, efficiency, and application-specific performance.
The SMCJ series targets high-energy transient suppression in harsh environments, specifically engineered for automotive, industrial, and telecom applications demanding 1500 W surge capability and robust thermal performance in compact SMC packages.
FAQ
What is the maximum clamping voltage of the SMCJ18A-M3/57T under a 10/1000 µs surge?
The SMCJ18A-M3/57T has a maximum clamping voltage (VC) of 29.2 V when subjected to its rated peak pulse current of 51.4 A using the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ18A-M3/57T maintains this clamping performance across its specified operating temperature range.
Is the SMCJ18A-M3/57T suitable for automotive applications?
Yes - the SMCJ18A-M3/57T is halogen-free and RoHS-compliant (M3 suffix), and an AEC-Q101-qualified variant (SMCJ18A-HM3/57T) is available for automotive use. While the base SMCJ18A-M3/57T itself is commercial-grade, its 1500 W surge rating, 150 °C max junction temperature, and MSL Level 1 moisture sensitivity make it suitable for non-safety-critical automotive subsystems such as body control modules and infotainment power rails.
How does the SMCJ18A-M3/57T differ from the SMCJ18CA-M3/57T?
The SMCJ18A-M3/57T is unidirectional with cathode-band polarity marking, while the SMCJ18CA-M3/57T is bidirectional with no polarity marking and symmetrical clamping in both directions. Both share identical VWM (18 V), VC (29.2 V), and PPPM (1500 W), but the unidirectional SMCJ18A-M3/57T offers lower junction capacitance in DC-biased applications and avoids unnecessary reverse conduction in single-polarity systems.
What is the thermal resistance of the SMCJ18A-M3/57T, and how does it affect layout design?
The SMCJ18A-M3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value requires adequate copper area and minimal trace length to maintain junction temperature below 150 °C during repeated surge events. Layouts must follow Vishay's pad dimensions and avoid thermal isolation to prevent premature thermal shutdown or degradation.
Does the SMCJ18A-M3/57T meet industry surge immunity standards?
Yes - the SMCJ18A-M3/57T's 1500 W peak pulse power rating (10/1000 µs) supports compliance with key surge immunity standards including IEC 61000-4-5 (Level 3, 2 kV/12 Ω), ISO 7637-2 (Pulse 1, 2a, 5a), and GR-1089-CORE (4 kV/2 Ω). Its fast response time and low clamping voltage ensure protected circuits remain within safe operating limits during standardized surge tests. The SMCJ18A-M3/57T is widely deployed in certified industrial and automotive end equipment.
SMCJ18A-M3/57T 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):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 51.4A
- 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)
SMCJ18A-M3/57T FAQ
1.How can I place an order for SMCJ18A-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ18A-M3/57T 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 SMCJ18A-M3/57T reliable?
The price and inventory of SMCJ18A-M3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ18A-M3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ18A-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ18A-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ18A-M3/57T?
SMCJ18A-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ18A-M3/57T 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 SMCJ18A-M3/57T?
For technical support, including SMCJ18A-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ18A-M3/57T requirements.
6.How does Aetrix verify that SMCJ18A-M3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ18A-M3/57T 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 SMCJ18A-M3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ18A-M3/57T?
All SMCJ18A-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ18A-M3/57T, 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 SMCJ18A-M3/57T part is unused and in its original packaging.
Return procedure for SMCJ18A-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ18A-M3/57T Tags
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