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Vishay General Semiconductor - Diodes Division SMCJ120A-M3/57T
- Part No.:
- SMCJ120A-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ120A-M3/57T.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,258
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Product details
Overview
SMCJ120A-M3/57T 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 1500 W peak pulse power rating, 133–147 V breakdown voltage (VBR), and 193 V clamping voltage (VC) at 7.8 A peak pulse current. It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients and lightning-induced surges in industrial power supplies and automotive ECUs.
For engineers reviewing the SMCJ120A-M3/57T datasheet, SMCJ120A-M3/57T pinout, SMCJ120A-M3/57T application, or SMCJ120A-M3/57T equivalent, this page delivers verified electrical parameters, thermal resistance (RθJA = 75 °C/W), polarity marking (cathode band), halogen-free RoHS compliance (M3 suffix), and AEC-Q101 qualification eligibility - all critical for ESD/surge design validation and automotive-grade BOM selection.
Technical Context
The SMCJ120A-M3/57T employs a glass-passivated silicon junction optimized for fast response (<1 ns) to transient overvoltages, with low incremental surge resistance enabling stable clamping under 10/1000 μs waveform stress. Its unidirectional polarity and cathode-band marking define strict anode-cathode orientation during PCB layout.
Thermally, it features RθJL = 15 °C/W (junction-to-lead) and operates across -55 °C to +150 °C junction temperature range. Derating above 25 °C ambient follows Fig. 2 in the datasheet, and mounting on 8.0 mm × 8.0 mm copper pads per terminal ensures rated 1500 W PPPM performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 133 V / 147 V at IT = 1 mA - defines reliable conduction onset under surge conditions |
| VWM | 120 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA |
| VC @ IPPM | 193 V at 7.8 A - clamped voltage limiting downstream circuit stress during 10/1000 μs surge |
| PPPM | 1500 W - peak pulse power handling capability with standard 10/1000 μs waveform |
| IFSM | 200 A - non-repetitive forward surge current rating (8.3 ms half-sine) |
| RθJA | 75 °C/W - thermal resistance junction-to-ambient, used to calculate max ambient temp for safe operation |
| TJ max | +150 °C - absolute maximum junction temperature for reliability and lifetime assurance |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant (M3 suffix), matte tin-plated leads, MSL Level 1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | Surge current sink node | Connected to protected line; conducts transient energy to ground when VAK > VBR |
| Anode (unmarked end) | Reference/ground return path | Typically tied to system ground or low-impedance return plane for effective clamping |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power rating | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) without derating on standard PCB pads |
| 193 V clamping voltage at 7.8 A | Limits voltage seen by downstream 150 V-rated MOSFETs or microcontrollers during worst-case transients |
| Glass-passivated junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity exposure |
| AEC-Q101 qualification option (HM3 suffix) | Supports direct use in automotive powertrain and body electronics where component-level reliability validation is mandatory |
| Low profile SMC package | Reduces board space vs. SMA/SMB; compatible with automated pick-and-place and reflow soldering |
Applications
| Industrial Motor Drives | Automotive Engine Control Units |
|---|---|
Use Scenario: Protection of gate drivers and current-sense amplifiers from back-EMF spikes during IGBT/MOSFET switching in variable-frequency drives. IC Role / Device Role / Timing Role: Unidirectional TVS placed between gate driver output and power FET gate, clamping negative-going transients. Use Value: Prevents gate oxide damage and false triggering by limiting transient voltage to ≤193 V while maintaining 120 V DC operating margin. | Use Scenario: Surge suppression on 12 V battery-supplied sensor inputs (e.g., crankshaft position, knock sensors) exposed to load-dump and jump-start events. IC Role / Device Role / Timing Role: Primary front-end protection device on sensor signal traces, mounted within 2 cm of connector entry point. Use Value: Withstands 1500 W pulses per ISO 7637-2 Pulse 5a without degradation, preserving signal integrity and ADC accuracy. |
| Telecom Power Rectifiers | Renewable Energy Inverters |
Use Scenario: Input-stage protection of AC/DC rectifier modules against lightning-induced surges on AC mains input. IC Role / Device Role / Timing Role: Parallel-connected TVS across bridge rectifier output, shunting surge energy before bulk capacitor. Use Value: Clamps 10/1000 μs transients to 193 V, preventing overvoltage failure of 200 V-rated electrolytic capacitors and control ICs. | Use Scenario: DC-link surge protection in solar string inverters subjected to grid-switching transients and nearby lightning strikes. IC Role / Device Role / Timing Role: Bidirectional-capable variant not used; unidirectional SMCJ120A-M3/57T deployed with series fuse and parallel MOV for staged protection. Use Value: Provides precise 120 V standoff and 193 V clamping to safeguard 1200 V IGBT gate drivers and isolated feedback circuits. |
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-E3/57T | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W) | Suitable only for lower-energy transients (IEC 61000-4-4 Level 3); not recommended for 1500 W surge environments | Select when board space is constrained and surge threat level is limited to <400 W. |
| SMCJ120CA-M3/57T | Bidirectional version; same VBR, VC, and PPPM but symmetrical clamping in both polarities | Required for AC-coupled or floating signal lines where polarity reversal may occur (e.g., RS-485, CAN bus) | Choose for bidirectional signal paths; SMCJ120A-M3/57T remains optimal for DC-biased unidirectional rails. |
Compared with SMAJ120A-E3/57T and SMCJ120CA-M3/57T, the SMCJ120A-M3/57T uniquely balances 1500 W surge capacity, unidirectional precision, and SMC thermal performance - making it the preferred choice for high-reliability DC power rail protection where clamping voltage margin and thermal stability are critical.
Availability
SMCJ120A-M3/57T is available at Aetrix Electronics and suitable for industrial motor drives, automotive engine control units, telecom rectifiers, and renewable energy inverters requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification readiness.
Supply support for SMCJ120A-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 is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and automotive-grade qualification.
The SMCJ series is engineered for high-energy transient suppression in harsh environments, targeting applications demanding robustness against lightning, inductive kickback, and load dump - especially where standardized 1500 W surge immunity is mandated.
FAQ
What is the breakdown voltage range of the SMCJ120A-M3/57T?
The SMCJ120A-M3/57T has a guaranteed breakdown voltage (VBR) range of 133 V to 147 V at test current IT = 1 mA, measured per ANSI/IEEE C62.35. This range ensures consistent turn-on behavior across production lots and supports reliable coordination with 120 V DC systems. The SMCJ120A-M3/57T maintains this specification under standard JEDEC test conditions and is validated per Vishay Document Number 88394.
Is the SMCJ120A-M3/57T suitable for automotive applications?
Yes - the SMCJ120A-M3/57T uses the M3 suffix indicating halogen-free, RoHS-compliant construction, and its base family is AEC-Q101 qualified (via HM3 variants). While the M3 suffix itself denotes commercial grade, the identical die and SMC package enable drop-in qualification path: engineers can specify SMCJ120A-HM3/57T for production automotive use. The SMCJ120A-M3/57T shares full parametric equivalence and thermal performance with qualified versions.
What does the "/57T" suffix indicate in SMCJ120A-M3/57T?
The "/57T" suffix specifies packaging: 7-inch diameter plastic tape and reel, with 850 units per reel. This format is optimized for high-speed SMT placement equipment and matches industry-standard feeder compatibility. The SMCJ120A-M3/57T reel configuration ensures consistent tension control and static-safe handling, supporting JIT manufacturing flows without repackaging. Traceability is maintained via reel label and inner box documentation.
How does the clamping voltage of SMCJ120A-M3/57T compare to its standoff voltage?
The SMCJ120A-M3/57T has a standoff voltage (VWM) of 120 V and a maximum clamping voltage (VC) of 193 V at 7.8 A IPPM - a 60.8 % overvoltage margin. This ratio ensures protected ICs rated for ≥200 V withstand worst-case transients without overstress. The SMCJ120A-M3/57T achieves this via low dynamic impedance and glass-passivated junction design, validated per 10/1000 μs waveform testing in Vishay's 88394 datasheet.
Can SMCJ120A-M3/57T be used in bidirectional signal protection?
No - the SMCJ120A-M3/57T is strictly unidirectional, with cathode band marking and asymmetric IV characteristics. For bidirectional protection (e.g., RS-485, CAN, AC lines), the SMCJ120CA-M3/57T variant must be used. Attempting to use SMCJ120A-M3/57T in reverse-biased configurations risks permanent breakdown. The SMCJ120A-M3/57T datasheet explicitly restricts operation to forward-conducting (anode-to-cathode) surge shunting.
SMCJ120A-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):
- 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-M3/57T FAQ
1.How can I place an order for SMCJ120A-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ120A-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 SMCJ120A-M3/57T reliable?
The price and inventory of SMCJ120A-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 SMCJ120A-M3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ120A-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ120A-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ120A-M3/57T?
SMCJ120A-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ120A-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 SMCJ120A-M3/57T?
For technical support, including SMCJ120A-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ120A-M3/57T requirements.
6.How does Aetrix verify that SMCJ120A-M3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ120A-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 SMCJ120A-M3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ120A-M3/57T?
All SMCJ120A-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ120A-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 SMCJ120A-M3/57T part is unused and in its original packaging.
Return procedure for SMCJ120A-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ120A-M3/57T Tags
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