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Vishay General Semiconductor - Diodes Division SMCJ120A-M3/9AT
- Part No.:
- SMCJ120A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ120A-M3/9AT.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,919
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Product details
Overview
SMCJ120A-M3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 120 V standoff voltage, 133–147 V breakdown range at 1 mA, and 193 V clamping voltage at 7.8 A peak pulse current. It delivers 1500 W peak pulse power handling under 10/1000 µs waveform and operates across –55 °C to +150 °C junction temperature range, commonly used to protect MOSFETs, ICs, and sensor signal lines in industrial power supplies.
For engineers reviewing the SMCJ120A-M3/9AT datasheet, SMCJ120A-M3/9AT pinout, SMCJ120A-M3/9AT application, or SMCJ120A-M3/9AT equivalent, key selection criteria include unidirectional polarity, 193 V clamping performance at rated surge current, halogen-free RoHS-compliant construction (M3 suffix), and compatibility with automated SMT placement on standard PCB pad layouts per JEDEC DO-214AB footprint.
Technical Context
The SMCJ120A-M3/9AT employs a glass-passivated silicon junction optimized for fast transient response (<1 ns) and low incremental surge resistance, enabling effective suppression of inductive switching spikes and lightning-induced surges. Its unidirectional configuration provides cathode-banded polarity with reverse-biased operation during overvoltage events.
Thermal design relies on its 75 °C/W junction-to-ambient thermal resistance and 15 °C/W junction-to-lead rating, requiring minimum 8.0 mm × 8.0 mm copper pads per terminal for full 1500 W PPPM derating per Fig. 2. It meets MSL Level 1 per J-STD-020 with 260 °C reflow peak and passes JESD201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VWM) | 120 V - Maximum continuous reverse operating voltage before clamping begins |
| Breakdown Voltage (VBR) | 133–147 V at 1 mA - Confirmed voltage range where device transitions from high-impedance to low-impedance conduction |
| Clamping Voltage (VC) | 193 V at 7.8 A IPPM - Peak voltage seen by protected circuit during 10/1000 µs surge event |
| Peak Pulse Power (PPPM) | 1500 W - Surge energy absorption capability under standardized 10/1000 µs waveform |
| Junction Temperature Range | –55 °C to +150 °C - Validated operating and storage range for industrial and automotive environments |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm body and 2.62 mm lead spacing |
| RoHS Compliance | Halogen-free, RoHS-compliant (M3 suffix) - Meets environmental requirements without brominated flame retardants |
Pinout & Package
SMCJ120A-M3/9AT uses the SMC (DO-214AB) package: molded epoxy case with matte tin-plated leads, 2-terminal unidirectional configuration. Polarity is marked by a cathode band on the body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to circuit ground or lowest potential node; forms forward path when TVS conducts in reverse bias |
| Cathode | High-side surge input terminal | Connected to line being protected; clamps voltage to VC when transient exceeds VWM |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMC package | Enables high-density PCB layout and compatibility with automated pick-and-place equipment |
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge stress |
| 1500 W peak pulse rating | Supports robust protection against IEC 61000-4-5 Level 4 (4 kV/2 Ω) surges in industrial interfaces |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking preconditioning |
| Halogen-free construction (M3) | Meets stringent environmental compliance for automotive and green electronics programs |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate drivers and IGBTs against inductive kickback from relay coils and solenoid loads. IC Role / Device Role / Timing Role: Unidirectional TVS placed across DC bus or gate-source terminals to clamp voltage spikes below MOSFET/IGBT breakdown limits. Use Value: Prevents cumulative degradation and catastrophic failure of power semiconductors during frequent load switching cycles. | Use Scenario: Shielding LIN bus transceivers and microcontroller I/O pins from battery dump and load-dump transients. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between signal line and chassis ground to absorb >100 V transients within nanoseconds. Use Value: Maintains communication integrity and prevents MCU reset or latch-up during vehicle electrical system disturbances. |
| Telecom Power Supplies | Industrial Sensor Signal Conditioning |
Use Scenario: Input-stage surge protection on 48 V telecom rectifier outputs exposed to lightning-induced surges on distribution lines. IC Role / Device Role / Timing Role: Primary-line TVS placed after EMI filter but before DC-DC converter to limit transient energy entering downstream circuitry. Use Value: Enables compliance with ITU-T K.20 and Telcordia GR-1089-CORE immunity requirements without oversized filtering. | Use Scenario: Protecting analog front-end inputs of pressure, temperature, and current sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Low-leakage (1 µA max at VWM) TVS shunting sensor lines to ground to suppress ESD and cable discharge events. Use Value: Preserves measurement accuracy by preventing input stage saturation or damage during field maintenance or cable hot-plug events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ120A-E3/61T | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W) | Suitable only for lower-energy transients; not recommended for IEC 61000-4-5 Level 3+ systems | Select when board space is constrained and surge threat level is limited to ESD or low-energy switching noise |
| SMCJ120CA-M3/9AT | Bidirectional variant; same VWM/VBR/VC ratings but symmetrical conduction in both polarities | Required for AC-coupled or floating signal lines where polarity reversal may occur (e.g., RS-485, CAN) | Choose for differential or bidirectional interfaces; requires no polarity awareness during placement |
Compared with SMAJ120A-E3/61T and SMCJ120CA-M3/9AT, the SMCJ120A-M3/9AT offers superior surge energy handling in a thermally robust SMC package while maintaining unidirectional polarity-ideal for DC bus and single-ended signal line protection where directional clamping is sufficient and preferred.
Availability
SMCJ120A-M3/9AT is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power supplies requiring stable component supply with halogen-free compliance and AEC-Q101-qualified alternatives available upon request.
Supply support for SMCJ120A-M3/9AT 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 optimization.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered for high-power transient suppression in harsh environments including automotive, industrial, and telecom infrastructure where consistent clamping performance and long-term stability are critical.
FAQ
What is the clamping voltage of the SMCJ120A-M3/9AT under maximum rated surge current?
The SMCJ120A-M3/9AT has a maximum clamping voltage (VC) of 193 V when subjected to its rated peak pulse current (IPPM) of 7.8 A under the standard 10/1000 µs waveform. This value is measured at the device terminals with specified PCB pad layout (8.0 mm × 8.0 mm copper per terminal) and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ120A-M3/9AT maintains this clamping performance across its operational temperature range.
Is the SMCJ120A-M3/9AT suitable for automotive applications?
The SMCJ120A-M3/9AT itself is commercial-grade (M3 suffix), but Vishay offers AEC-Q101-qualified variants under HM3 suffix (e.g., SMCJ120A-HM3/9AT). While the SMCJ120A-M3/9AT shares identical electrical characteristics and thermal behavior, it lacks formal automotive qualification documentation. For production automotive use, the SMCJ120A-M3/9AT should be validated per OEM requirements or replaced with the HM3 version. The SMCJ120A-M3/9AT remains appropriate for industrial and telecom applications demanding equivalent performance.
How does the M3 suffix affect the SMCJ120A-M3/9AT's material composition and compliance?
The M3 suffix on the SMCJ120A-M3/9AT indicates halogen-free, RoHS-compliant construction-specifically, absence of brominated and chlorinated flame retardants in the molding compound. It meets JEDEC J-STD-020 MSL Level 1 and JESD201 Class 2 whisker resistance requirements. This makes the SMCJ120A-M3/9AT suitable for environmentally regulated markets and green electronics initiatives without compromising surge performance or thermal reliability compared to E3-suffix variants.
What is the recommended PCB layout for optimal thermal and surge performance of the SMCJ120A-M3/9AT?
Vishay specifies a minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pad area for each terminal of the SMCJ120A-M3/9AT to achieve full 1500 W peak pulse power rating. Thermal vias under pads and internal copper planes improve heat dissipation. Trace width should exceed 1.5 mm to minimize inductance during surge events. The SMCJ120A-M3/9AT must be placed as close as possible to the protected node, with short, direct paths to ground. Avoid routing sensitive traces near the SMCJ120A-M3/9AT body to prevent coupling.
Does the SMCJ120A-M3/9AT have polarity marking, and how is it identified?
Yes, the SMCJ120A-M3/9AT is unidirectional and features a visible cathode band on the body end of the SMC (DO-214AB) package. This band identifies the cathode terminal, which must be connected toward the side of the circuit experiencing overvoltage (e.g., positive rail or signal line), while the anode connects to ground or return path. Bidirectional variants (e.g., SMCJ120CA-M3/9AT) omit this marking. Correct orientation is essential-reverse installation renders the SMCJ120A-M3/9AT ineffective for reverse-polarity transients.
SMCJ120A-M3/9AT 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):
- 120V
- Voltage - Breakdown (Min):
- 133V
- Voltage - Clamping (Max) @ Ipp:
- 193V
- Current - Peak Pulse (10/1000µs):
- 7.8A
- 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)
SMCJ120A-M3/9AT FAQ
1.How can I place an order for SMCJ120A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ120A-M3/9AT 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 SMCJ120A-M3/9AT reliable?
The price and inventory of SMCJ120A-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ120A-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ120A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ120A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ120A-M3/9AT?
SMCJ120A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ120A-M3/9AT 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 SMCJ120A-M3/9AT?
For technical support, including SMCJ120A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ120A-M3/9AT requirements.
6.How does Aetrix verify that SMCJ120A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ120A-M3/9AT 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 SMCJ120A-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ120A-M3/9AT?
All SMCJ120A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ120A-M3/9AT, 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 SMCJ120A-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ120A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ120A-M3/9AT Tags
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