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Vishay General Semiconductor - Diodes Division SMCJ120A-E3/57T
- Part No.:
- SMCJ120A-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ120A-E3/57T.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,567
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Product details
Overview
SMCJ120A-E3/57T 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 (VWM), 133–147 V breakdown voltage (VBR), and 193 V clamping voltage (VC) at 7.8 A peak pulse current (IPPM). It delivers 1500 W peak pulse power (10/1000 μs waveform) and operates from –55 °C to +150 °C, commonly used to protect MOSFETs and signal lines in industrial motor drives.
For engineers reviewing the SMCJ120A-E3/57T datasheet, SMCJ120A-E3/57T pinout, SMCJ120A-E3/57T application, or SMCJ120A-E3/57T equivalent, key selection criteria include clamping voltage margin relative to protected IC VDS(max), thermal resistance (RθJA = 75 °C/W), unidirectional polarity marking, RoHS-compliant matte tin plating, and AEC-Q101 qualification eligibility via HE3 suffix variants.
Technical Context
The SMCJ120A-E3/57T 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 alignment with DC-biased rails.
Designed for surface-mount assembly on 8.0 mm × 8.0 mm copper pads per terminal, it meets J-STD-020 MSL Level 1 (peak reflow ≤260 °C) and JESD201 Class 2 whisker resistance. The device sustains 200 A non-repetitive forward surge (8.3 ms half-sine) and exhibits a VBR temperature coefficient of 0.108 %/°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for protected circuit DC bias. |
| VBR min/max | 133 V / 147 V at 1 mA - Confirmed breakdown range ensures reliable turn-on above VWM with defined margin. |
| VC @ IPPM | 193 V at 7.8 A - Clamping voltage under 10/1000 μs surge defines maximum stress imposed on downstream components. |
| PPPM | 1500 W - Peak pulse power rating determines survivability against standardized lightning/surge waveforms. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance informs PCB copper pad sizing and derating above 25 °C ambient. |
| TJ max | +150 °C - Maximum junction temperature enables use in under-hood automotive and high-temperature industrial enclosures. |
| Polarity | Unidirectional - Cathode band identifies terminal for correct orientation in DC-coupled protection paths. |
Pinout & Package
Package: SMC (DO-214AB), molded epoxy case meeting UL 94 V-0 flammability rating; matte tin-plated leads solderable per J-STD-002 and JESD22-B102; cathode indicated by band on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink | Connected to protected line; conducts transient energy to ground or lower-potential rail during overvoltage event. |
| Anode (unmarked end) | Reference potential node | Typically tied to system ground or negative rail; completes conduction path when VAK exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMC package | Enables automated placement and fits space-constrained PCB layouts while maintaining 1500 W surge capability. |
| Glass-passivated junction | Ensures stable VBR over lifetime and improved reliability versus epoxy-passivated alternatives in humid/harsh environments. |
| 1500 W peak pulse power | Provides robust protection against IEC 61000-4-5 Level 4 (4 kV line-earth) surges without degradation. |
| 0.108 %/°C VBR tempco | Minimizes drift in clamping threshold across automotive and industrial temperature ranges, preserving design margin. |
| RoHS-compliant E3 suffix | Meets global environmental regulations with matte tin terminations compatible with lead-free reflow profiles. |
Applications
| Industrial Motor Drives | Automotive Power Modules |
|---|---|
Use Scenario: Protection of IGBT gate drivers and DC-link sensing circuits against inductive kickback during PWM switching. IC Role / Device Role / Timing Role: Unidirectional TVS placed across gate-source or supply-rail nodes to clamp transients below MOSFET/IGBT VGS(max) or VDS(max). Use Value: Limits voltage overshoot to ≤193 V, preventing gate oxide rupture and ensuring >100,000-cycle reliability under 1500 W surge conditions. | Use Scenario: Guarding LIN bus transceivers and microcontroller I/O pins against load-dump and jump-start events in 12 V vehicle systems. IC Role / Device Role / Timing Role: Standoff-rated TVS on signal lines to absorb 10/1000 μs surges while maintaining <1 μA leakage at 120 V. Use Value: Maintains signal integrity during ISO 7637-2 Pulse 5a (load dump) by clamping within 1 ns and surviving 200 A surge peaks. |
| Telecom Power Supplies | Renewable Energy Inverters |
Use Scenario: Safeguarding AC-DC front-end rectifiers and PFC controller inputs from lightning-induced surges on AC mains input. IC Role / Device Role / Timing Role: Primary-side TVS mounted between live/neutral and chassis ground to divert common-mode transients. Use Value: Withstands repeated 1500 W pulses without parameter shift, supporting EN 61000-4-5 compliance up to 4 kV. | Use Scenario: Protecting MPPT controller voltage sense inputs and auxiliary power rails in solar string inverters exposed to outdoor surge environments. IC Role / Device Role / Timing Role: High-VWM TVS on analog monitoring paths to prevent ADC saturation and false fault triggering during grid transients. Use Value: 120 V standoff allows operation across full PV array open-circuit range while clamping to 193 V to preserve measurement accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120A-E3/52T | Lower PPPM (600 W), SMB package (smaller footprint, higher RθJA = 110 °C/W) | Suitable for lower-energy surges; limited to PCBs with minimal copper area or lower ambient temperatures | Select when board space is constrained and surge threat level is ≤IEC 61000-4-5 Level 2. |
| SMCJ120CA-E3/57T | Bidirectional variant; same VWM/VBR/VC ratings but 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 transformer-isolated interfaces needing bidirectional protection. |
Compared with SMBJ120A-E3/52T and SMCJ120CA-E3/57T, the SMCJ120A-E3/57T offers superior surge handling (1500 W vs. 600 W) and thermal performance (RθJA = 75 °C/W) in unidirectional DC applications, making it optimal for high-reliability industrial and automotive power stages where clamping margin and thermal stability are critical.
Availability
SMCJ120A-E3/57T is available at Aetrix Electronics and suitable for industrial motor drives, automotive power modules, telecom power supplies, and renewable energy inverters requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ120A-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, power efficiency, and automotive-grade qualification.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments including automotive under-hood, industrial automation, and outdoor power electronics.
FAQ
What is the clamping voltage of the SMCJ120A-E3/57T and how does it protect downstream components?
The SMCJ120A-E3/57T has a maximum clamping voltage (VC) of 193 V at 7.8 A peak pulse current (10/1000 μs waveform). This value defines the highest voltage that appears across the protected circuit during a surge event. By limiting transient voltage to ≤193 V, the SMCJ120A-E3/57T prevents overstress of downstream MOSFETs, gate drivers, or sensors rated for lower absolute maximum voltages-ensuring functional safety and long-term reliability in industrial and automotive applications where the SMCJ120A-E3/57T is deployed.
Is the SMCJ120A-E3/57T suitable for automotive applications, and what qualifications does it meet?
The SMCJ120A-E3/57T itself is RoHS-compliant commercial-grade (E3 suffix), but Vishay offers AEC-Q101 qualified versions under HE3/HM3 suffixes (e.g., SMCJ120AHE3_A). While the SMCJ120A-E3/57T shares identical electrical and thermal specs, only HE3-suffix variants are certified for automotive use. Engineers selecting the SMCJ120A-E3/57T for automotive designs must verify qualification status per ordering code and consult Vishay's AEC-Q101 test reports for the SMCJ120AHE3_A variant to ensure compliance with vehicle-level reliability requirements.
How does the thermal resistance of the SMCJ120A-E3/57T affect PCB layout decisions?
The SMCJ120A-E3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. To maintain TJ ≤150 °C at full 1500 W surge, PCB layout must provide adequate copper area and minimize thermal bottlenecks. Reducing pad size or using thinner copper increases RθJA, risking thermal runaway during repetitive surges. Therefore, the SMCJ120A-E3/57T requires adherence to Vishay's recommended pad layout to achieve its rated power dissipation and avoid premature failure in high-temperature environments.
What is the significance of the "E3/57T" suffix in SMCJ120A-E3/57T?
The "E3" suffix indicates RoHS-compliant, commercial-grade construction with matte tin-plated leads, qualified for lead-free reflow (J-STD-020 MSL Level 1, peak 260 °C). The "57T" denotes packaging: 7-inch plastic tape-and-reel with 850 units per reel. This format supports high-speed automated pick-and-place assembly. The SMCJ120A-E3/57T is not AEC-Q101 qualified-engineers requiring automotive qualification must select the HE3-suffix variant (e.g., SMCJ120AHE3_A) and confirm compliance documentation before deployment in vehicle systems.
Can the SMCJ120A-E3/57T be used in bidirectional signal protection applications?
No-the SMCJ120A-E3/57T is a unidirectional TVS diode, identifiable by its cathode band marking and specified for DC-biased protection paths. For bidirectional signal lines (e.g., RS-485, CAN, or AC-coupled interfaces), the bidirectional variant SMCJ120CA-E3/57T must be used. That part provides symmetrical clamping in both polarities with identical VBR, VWM, and VC ratings-but no polarity marking. Using the unidirectional SMCJ120A-E3/57T on bidirectional signals risks reverse-bias breakdown and permanent damage during negative transients.
SMCJ120A-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):
- 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)
SMCJ120A-E3/57T FAQ
1.How can I place an order for SMCJ120A-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ120A-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 SMCJ120A-E3/57T reliable?
The price and inventory of SMCJ120A-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 SMCJ120A-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ120A-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ120A-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ120A-E3/57T?
SMCJ120A-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ120A-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 SMCJ120A-E3/57T?
For technical support, including SMCJ120A-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ120A-E3/57T requirements.
6.How does Aetrix verify that SMCJ120A-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ120A-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 SMCJ120A-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ120A-E3/57T?
All SMCJ120A-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ120A-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 SMCJ120A-E3/57T part is unused and in its original packaging.
Return procedure for SMCJ120A-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ120A-E3/57T Tags
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