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Vishay General Semiconductor - Diodes Division SMCJ120CA-M3/9AT
- Part No.:
- SMCJ120CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ120CA-M3/9AT.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
SMCJ120CA-M3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 1500 W peak pulse power rating, 193 V maximum clamping voltage at 7.8 A peak pulse current, and 120 V standoff voltage. It protects sensitive ICs, MOSFETs, and sensor signal lines in automotive and industrial power electronics against inductive switching transients and lightning-induced surges.
For engineers reviewing the SMCJ120CA-M3/9AT datasheet, SMCJ120CA-M3/9AT pinout, SMCJ120CA-M3/9AT application, or SMCJ120CA-M3/9AT equivalent, key selection criteria include bidirectional clamping capability, 120 V working voltage, 193 V clamping under 10/1000 µs surge, halogen-free RoHS compliance (M3 suffix), and AEC-Q101 qualification readiness via HM3 variant.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within picoseconds to transient overvoltages exceeding its reverse standoff voltage (VWM = 120 V). Its bidirectional symmetry ensures identical clamping behavior in both polarities, eliminating polarity-sensitive layout constraints.
Constructed with glass-passivated junctions and rated for TJ = –55 °C to +150 °C operation, it delivers stable performance under thermal stress while maintaining low incremental surge resistance and meeting J-STD-020 MSL Level 1 reflow compatibility up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 133 V / 147 V - Breakdown occurs within this range at 1 mA test current, defining turn-on threshold |
| VC @ IPPM | 193 V - Clamped voltage across device during 7.8 A 10/1000 µs surge, limiting downstream stress |
| PPPM | 1500 W - Peak pulse power handling per single transient event, enabling robust surge immunity |
| ID @ VWM | 1.0 µA - Reverse leakage at 120 V ensures minimal standby power loss and signal integrity |
| Package | SMC (DO-214AB) - Surface-mount outline with 8.0 mm × 8.0 mm copper pad thermal interface for 75 °C/W RθJA |
| Compliance | Halogen-free, RoHS-compliant (M3 suffix), UL 497B recognized, JESD201 Class 2 whisker resistant |
Pinout & Package
SMCJ120CA-M3/9AT uses the standard SMC (DO-214AB) surface-mount package: two-terminal, non-polarized bidirectional device with no cathode marking. The case is molded epoxy meeting UL 94 V-0 flammability rating; terminals are matte tin-plated for J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional surge path | No polarity marking required; either terminal serves as input/output for transient energy diversion |
| Case (body) | Thermal and mechanical interface | Non-conductive epoxy body; heat dissipation relies on PCB copper pads (0.31" × 0.31") per datasheet fig. 2 |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 1500 W peak pulse rating | Withstands IEC 61000-4-5 Level 4 (4 kV) surges when properly mounted on recommended copper area |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage exposure to protected circuitry compared to competing TVS devices |
| MSL Level 1 moisture sensitivity | Allows direct placement into reflow ovens without baking, reducing manufacturing overhead |
| Halogen-free & RoHS-compliant (M3) | Meets environmental compliance requirements for automotive and industrial end equipment |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
Use Scenario: Protecting 12 V/24 V power rails in engine control units and body electronics from load dump and alternator transients. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed upstream of DC-DC converters and microcontrollers. Use Value: Limits voltage to ≤193 V during 7.8 A surge events, preventing latch-up or gate oxide damage in downstream semiconductors. | Use Scenario: Guarding analog outputs of pressure/temperature sensors interfacing with PLCs in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional clamp on differential or single-ended sensor outputs exposed to EMI and cable discharge events. Use Value: Maintains signal fidelity with only 1.0 µA leakage at 120 V, while clamping fast-rising transients before they corrupt ADC readings. |
| Telecom Line Interface | Consumer Appliance Motor Control |
Use Scenario: Safeguarding Ethernet PHY interfaces and RS-485 transceivers connected to external cabling in network infrastructure gear. IC Role / Device Role / Timing Role: Primary-level surge suppression on data line pairs before secondary TVS or common-mode chokes. Use Value: Responds in <1 ps to meet IEC 61000-4-5 surge immunity requirements without adding propagation delay to data signals. | Use Scenario: Shielding gate drivers and bootstrap circuits in BLDC motor inverters used in HVAC and washing machines. IC Role / Device Role / Timing Role: Clamp across DC bus or half-bridge legs to absorb inductive kickback from motor windings. Use Value: Handles repetitive 1500 W pulses without degradation, supporting >100,000 surge cycles per JEDEC JESD22-A114 reliability testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120CA-M3 | Lower PPPM (600 W), same VWM/VC, SMB package (smaller footprint, higher RθJA) | Suitable for space-constrained consumer designs with lower surge threat levels | Select when board area is critical and IEC 61000-4-5 Level 3 (2 kV) suffices |
| SMCJ120A-M3/9AT | Unidirectional version; same VWM/VC/PPPM but requires correct polarity orientation | Applicable where DC bias exists and reverse conduction must be blocked | Choose only if system topology guarantees unidirectional surge direction and polarity alignment |
Compared with SMBJ120CA-M3 and SMCJ120A-M3/9AT, the SMCJ120CA-M3/9AT uniquely provides bidirectional 1500 W surge handling in an industry-standard SMC footprint-enabling drop-in replacement in existing layouts requiring symmetrical clamping without redesigning polarity routing or derating for thermal resistance.
Availability
SMCJ120CA-M3/9AT is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interfaces, telecom line protection, and consumer appliance motor control requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ120CA-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 engineered for high-energy transient suppression in harsh environments-targeting automotive, industrial, and telecom systems where sustained surge immunity and AEC-Q101 readiness are mandatory.
FAQ
What is the clamping voltage of SMCJ120CA-M3/9AT under a standard 10/1000 µs surge?
The SMCJ120CA-M3/9AT clamps to a maximum of 193 V when subjected to its rated 7.8 A peak pulse current (IPPM) under the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet revision 09-Jan-2024, ensuring predictable overvoltage limiting for protected circuits.
Is SMCJ120CA-M3/9AT suitable for automotive applications?
Yes, SMCJ120CA-M3/9AT is halogen-free and RoHS-compliant (M3 suffix), and its automotive-qualified variant SMCJ120CA-HM3_X meets AEC-Q101. While the M3/9AT itself is commercial-grade, its construction-including glass-passivated junction, –55 °C to +150 °C operating range, and MSL Level 1-supports automotive use when qualified by the end customer per their reliability requirements.
How does the bidirectional design of SMCJ120CA-M3/9AT affect PCB layout?
The bidirectional design of SMCJ120CA-M3/9AT eliminates polarity marking and orientation constraints-either terminal connects identically to the protected line. This simplifies layout, avoids assembly errors, and enables use on AC-coupled, floating, or differential signal paths without concern for anode/cathode placement during routing or placement.
What is the thermal resistance of SMCJ120CA-M3/9AT in typical mounting conditions?
SMCJ120CA-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the minimum recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value assumes still air and defines safe power derating above TA = 25 °C per Figure 2 in the Vishay datasheet 88394.
Does SMCJ120CA-M3/9AT require a heatsink for standard surge duty?
No, SMCJ120CA-M3/9AT does not require an external heatsink for transient suppression duty because its 1500 W peak pulse power is inherently short-duration (<1 ms). Thermal design focuses on steady-state dissipation (PD = 6.5 W), which is managed via PCB copper area; the device's RθJL = 15 °C/W ensures efficient conduction to leads and pads without added thermal mass.
SMCJ120CA-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:
- -
- Bidirectional Channels:
- 1
- 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)
SMCJ120CA-M3/9AT FAQ
1.How can I place an order for SMCJ120CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ120CA-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 SMCJ120CA-M3/9AT reliable?
The price and inventory of SMCJ120CA-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 SMCJ120CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ120CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ120CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ120CA-M3/9AT?
SMCJ120CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ120CA-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 SMCJ120CA-M3/9AT?
For technical support, including SMCJ120CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ120CA-M3/9AT requirements.
6.How does Aetrix verify that SMCJ120CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ120CA-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 SMCJ120CA-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ120CA-M3/9AT?
All SMCJ120CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ120CA-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 SMCJ120CA-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ120CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ120CA-M3/9AT Tags
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