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Vishay General Semiconductor - Diodes Division SMCJ120CA-E3/9AT
- Part No.:
- SMCJ120CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ120CA-E3/9AT.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,169
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Product details
Overview
SMCJ120CA-E3/9AT from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients up to 193 V at 7.8 A peak pulse current, with 1500 W peak pulse power rating and 120 V standoff voltage. It protects sensitive ICs, MOSFETs, and sensor signal lines in automotive, industrial, and telecom systems against inductive switching surges and lightning-induced transients.
For engineers reviewing the SMCJ120CA-E3/9AT datasheet, SMCJ120CA-E3/9AT pinout, SMCJ120CA-E3/9AT application, or SMCJ120CA-E3/9AT equivalent, key selection criteria include bidirectional clamping capability, 120 V working voltage, 193 V maximum clamping voltage at rated surge, RoHS-compliant matte tin terminations, and MSL Level 1 moisture sensitivity for automated assembly.
Technical Context
The SMCJ120CA-E3/9AT operates as a silicon avalanche diode with symmetrical breakdown in both directions, enabling protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable leakage (<1.0 μA at 120 V) and repeatable clamping performance across temperature (-55 °C to +150 °C).
It delivers 1500 W peak pulse power handling per 10/1000 μs waveform under standard mounting conditions (8.0 mm × 8.0 mm copper pads), with low incremental surge resistance and fast response time (<1.0 ns), making it suitable for high-energy transient suppression where minimal voltage overshoot is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VWM) | 120 V - Maximum continuous reverse voltage before significant conduction begins; defines operating margin below clamping threshold. |
| Breakdown Voltage (VBR) | 133–147 V at 1 mA - Confirmed avalanche initiation range; ensures reliable triggering above normal operating voltage. |
| Clamping Voltage (VC) | 193 V at 7.8 A IPPM - Peak voltage seen by protected circuit during full-rated 10/1000 μs surge; determines stress on downstream components. |
| Peak Pulse Power (PPPM) | 1500 W - Energy-handling capacity for standardized transient waveforms; enables robust protection against IEC 61000-4-5 Level 4 surges. |
| Leakage Current (ID) | ≤1.0 μA at 120 V - Minimal standby power loss and signal integrity impact in high-impedance circuits. |
| Operating Temperature | -55 °C to +150 °C - Supports under-hood automotive, industrial control, and outdoor telecom deployments without derating. |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with J-STD-020 reflow profiles. |
Pinout & Package
SMCJ120CA-E3/9AT uses a 2-terminal SMC (DO-214AB) package with no polarity marking for bidirectional operation. Both terminals are electrically symmetrical; neither is designated anode or cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Transient Input/Output Node | Connects to line being protected (e.g., CAN bus pair, RS-485 differential line, or DC power rail); identical function to Terminal 2. |
| Terminal 2 | Transient Input/Output Node | Second connection point for bidirectional clamping; forms symmetrical TVS junction between Terminals 1 and 2. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC, differential, or floating signal paths without external polarity management. |
| 1500 W peak pulse rating | Meets IEC 61000-4-5 surge immunity requirements for industrial and automotive applications up to Level 4 (4 kV/2 Ω). |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow processing without baking; supports high-yield automated SMT assembly. |
| Glass-passivated junction | Ensures long-term stability of breakdown voltage and leakage current over thermal cycling and humidity exposure. |
| RoHS-compliant matte tin leads | Guarantees solderability per J-STD-002 and whisker resistance per JESD 201 Class 2 for reliable interconnects. |
Applications
| Automotive Power Line Protection | Industrial RS-485 Interface |
|---|---|
|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed across power rail input to clamp surges up to ±193 V while maintaining <1.0 μA leakage at nominal voltage. Use Value: Prevents damage to MCU power supplies and CAN transceivers during ISO 7637-2 Pulse 5a events without adding series impedance. |
Use Scenario: Safeguarding half-duplex RS-485 transceivers in factory automation networks exposed to ground potential differences. IC Role / Device Role / Timing Role: Differential-line TVS connected between A and B bus lines to suppress common-mode surges while preserving signal integrity at 10 Mbps. Use Value: Limits bus voltage excursion to ≤193 V during IEC 61000-4-5 4 kV coupling, avoiding transceiver latch-up or permanent failure. |
| Telecom DSL Line Protection | Consumer Appliance Motor Drive |
|
Use Scenario: Shielding ADSL/VDSL line interface ICs from lightning-induced surges entering via outdoor copper pairs. IC Role / Device Role / Timing Role: Primary protection device mounted at line entry point, operating in bidirectional mode to handle both positive and negative transients. Use Value: Clamps induced surges to ≤193 V within <1 ns, allowing secondary protection (e.g., GDT + MOV) to handle residual energy without overstress. |
Use Scenario: Securing microcontroller GPIOs and gate drivers in washing machine motor control boards subjected to brush-commutator noise. IC Role / Device Role / Timing Role: Localized TVS on low-voltage control signals (e.g., PWM enable, direction logic) to absorb repetitive inductive kickback. Use Value: Maintains signal fidelity with <1.0 μA leakage at 12 V, preventing false triggering while surviving >100,000 surge events per MIL-STD-883H Method 3015.8. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120CA-E3/52T | Lower PPPM (600 W), smaller SMB package (DO-214AA), same 120 V VWM and bidirectional configuration. | Suitable for space-constrained PCBs with lower surge energy requirements (e.g., consumer USB ports). | Select when board area is limited and peak surge energy does not exceed 600 W; verify thermal derating for ambient >70 °C. |
| SMCJ120A-E3/9AT | Unidirectional variant with identical VWM (120 V), VC (193 V), and PPPM (1500 W); includes cathode band marking. | Required only where polarity-sensitive DC rails need asymmetric clamping (e.g., single-supply op-amp inputs). | Choose only if circuit topology mandates unidirectional protection; otherwise SMCJ120CA-E3/9AT provides broader design flexibility. |
Compared with SMBJ120CA-E3/52T and SMCJ120A-E3/9AT, the SMCJ120CA-E3/9AT uniquely balances 1500 W surge capacity with bidirectional symmetry and SMC package thermal performance-making it optimal for high-reliability industrial and automotive differential or AC-coupled interfaces where polarity independence and energy handling are both essential.
Availability
SMCJ120CA-E3/9AT is available at Aetrix Electronics and suitable for automotive ECU designs, industrial RS-485 networks, telecom DSL line cards, and appliance motor control systems requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ120CA-E3/9AT 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, precision, and automotive-grade qualification.
The SMCJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness against ISO 7637, IEC 61000-4-5, and lightning-induced surges is mandatory.
FAQ
What is the clamping voltage of the SMCJ120CA-E3/9AT at its rated peak pulse current?
The SMCJ120CA-E3/9AT has a maximum clamping voltage (VC) of 193 V at its rated peak pulse current (IPPM) of 7.8 A under a 10/1000 μs waveform. This value is measured with the device mounted on 8.0 mm × 8.0 mm copper pads per terminal, and represents the upper voltage limit imposed on protected circuitry during full-rated surge events. The SMCJ120CA-E3/9AT maintains this clamping performance across its operating temperature range of -55 °C to +150 °C.
Is the SMCJ120CA-E3/9AT suitable for automotive applications?
Yes, the SMCJ120CA-E3/9AT is qualified to AEC-Q101 when ordered with HE3 or HM3 suffixes; however, the -E3/9AT variant is commercial-grade and RoHS-compliant. For automotive use, engineers should specify SMCJ120CAHE3_A/I or equivalent AEC-Q101 versions. The SMCJ120CA-E3/9AT shares identical electrical characteristics-including 120 V standoff, 193 V clamping, and 1500 W pulse rating-with its automotive-qualified siblings, but lacks formal AEC-Q101 certification documentation.
How does the bidirectional design of the SMCJ120CA-E3/9AT affect its circuit implementation?
The bidirectional design of the SMCJ120CA-E3/9AT eliminates polarity concerns during placement: no cathode band marking is present, and both terminals are functionally identical. This allows direct placement across AC-coupled lines (e.g., RS-485 A/B), transformer secondaries, or floating power domains without orientation checks. The SMCJ120CA-E3/9AT clamps equally for positive and negative transients, simplifying layout and reducing BOM count versus dual-unidirectional solutions.
What is the thermal resistance of the SMCJ120CA-E3/9AT, and how does it impact power dissipation?
The SMCJ120CA-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead resistance (RθJL) of 15 °C/W. At TA = 50 °C, its steady-state power dissipation (PD) is rated at 6.5 W. These values mean that under natural convection, the junction temperature rise is 488 °C above ambient for full 6.5 W dissipation-so the device relies on short-duration transient operation rather than continuous power handling. The SMCJ120CA-E3/9AT is not intended for DC power regulation.
Does the SMCJ120CA-E3/9AT require special PCB layout considerations?
Yes-the SMCJ120CA-E3/9AT must be mounted on minimum 8.0 mm × 8.0 mm copper pads per terminal to achieve its rated 1500 W peak pulse power and 7.8 A IPPM. Smaller pads reduce thermal mass and increase junction temperature during surge events, degrading clamping performance and risking failure. The SMCJ120CA-E3/9AT also requires short, low-inductance traces to the protected node to preserve sub-nanosecond response; routing near high-dI/dt paths or noisy grounds should be avoided.
SMCJ120CA-E3/9AT 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 (SMCJ)
SMCJ120CA-E3/9AT FAQ
1.How can I place an order for SMCJ120CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ120CA-E3/9AT 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-E3/9AT reliable?
The price and inventory of SMCJ120CA-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ120CA-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ120CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ120CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ120CA-E3/9AT?
SMCJ120CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ120CA-E3/9AT 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-E3/9AT?
For technical support, including SMCJ120CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ120CA-E3/9AT requirements.
6.How does Aetrix verify that SMCJ120CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ120CA-E3/9AT 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-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ120CA-E3/9AT?
All SMCJ120CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ120CA-E3/9AT, 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-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ120CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ120CA-E3/9AT Tags
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