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Vishay General Semiconductor - Diodes Division SMCJ120A-E3/9AT
- Part No.:
- SMCJ120A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ120A-E3/9AT.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,307
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Product details
Overview
SMCJ120A-E3/9AT 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 (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 power rails and I/O lines in industrial motor drives.
For engineers reviewing the SMCJ120A-E3/9AT datasheet, SMCJ120A-E3/9AT pinout, SMCJ120A-E3/9AT application, or SMCJ120A-E3/9AT equivalent, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, thermal resistance (RθJA = 75 °C/W), unidirectional polarity marking (cathode band), and RoHS-compliant matte tin plating per J-STD-002.
Technical Context
The SMCJ120A-E3/9AT uses a glass-passivated silicon junction optimized for fast response (<1 ns) to transient overvoltages, with low incremental surge resistance ensuring stable clamping under repetitive surges. Its unidirectional configuration provides forward conduction path only during reverse overvoltage events, enabling integration into DC-biased circuits without leakage-induced bias shift.
Rated for 1500 W peak pulse power (10/1000 µs), it derates linearly above 25 °C ambient per Fig. 2, maintaining 7.8 A IPPM at TA = 25 °C on 8.0 mm × 8.0 mm copper pads. The device meets MSL Level 1 (260 °C reflow peak) and supports automated placement due to low-profile SMC package geometry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for normal circuit operation. |
| VBR min/max | 133 V / 147 V - Breakdown occurs within this range at 1 mA test current; defines onset of avalanche conduction. |
| VC @ IPPM | 193 V - Clamped voltage across device at 7.8 A peak pulse current; determines worst-case stress on downstream components. |
| PPPM | 1500 W - Peak transient energy absorption capability using standard 10/1000 µs waveform; validates robustness against lightning or inductive spikes. |
| TJ max | +150 °C - Maximum junction temperature; enables use in high-ambient environments like motor control enclosures. |
| RθJA | 75 °C/W - Thermal resistance from junction to ambient; informs required PCB copper area for sustained power dissipation. |
| Polarity | Unidirectional - Cathode marked by band; blocks forward current until VWM exceeded in reverse direction. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode identified by molded band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry terminal | Connected to lower-potential side of protected line; conducts only during forward-biased fault conditions. |
| Cathode | Reverse-biased avalanche terminal | Marked by band; connected to higher-potential side; initiates clamping when reverse voltage exceeds VWM. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable, repeatable avalanche characteristics over lifetime and temperature; eliminates surface contamination sensitivity. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving protection margin for 3.3 V or 5 V logic interfaces. |
| MSL Level 1 compliance | Supports standard lead-free reflow profiles up to 260 °C peak without popcorn cracking or delamination. |
| RoHS-compliant E3 suffix | Meets EU RoHS Directive 2011/65/EU; no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE. |
| Automated placement compatibility | Standard SMC footprint and coplanar leads enable high-yield pick-and-place assembly at >30,000 UPH. |
Applications
| Industrial Motor Drives | Automotive Power Distribution |
|---|---|
Use Scenario: Protection of gate drivers and MCU power inputs against back-EMF spikes from brushed DC motors. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12 V supply rail and ground, clamping transients induced by relay switching or load dump. Use Value: Limits voltage excursion to ≤193 V, preserving 200 V-rated MOSFETs and 5 V LDOs downstream without derating. | Use Scenario: Surge suppression on battery feed lines in body control modules exposed to ISO 7637-2 Pulse 1/2a/5a. IC Role / Device Role / Timing Role: Primary front-end clamp on 12 V main input, absorbing 1500 W pulses while maintaining <10 µA leakage at 12 V. Use Value: Enables compliance with automotive EMC requirements without additional filtering stages or oversized capacitors. |
| Telecom Power Supplies | Industrial PLC I/O Modules |
Use Scenario: Input-stage protection for AC/DC adapters powering PoE switches subjected to lightning-induced surges on primary side. IC Role / Device Role / Timing Role: Parallel-connected TVS on bulk capacitor input, triggered by >120 V transients exceeding transformer insulation limits. Use Value: Absorbs 10/1000 µs surges up to 7.8 A without degradation, extending adapter MTBF beyond 10 years. | Use Scenario: Field-side protection for 24 V digital input channels receiving signals from proximity sensors in factory automation. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to 24 V rail, shunting induced transients from long cable runs before reaching optocoupler input. Use Value: Maintains <1 µA leakage at 24 V, preventing false triggering while clamping to 193 V to safeguard 30 V-rated interface ICs. |
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), smaller SMB package (DO-214AA), same VWM/VBR/VC specs. | Suitable for space-constrained designs with lower surge exposure; not rated for 1500 W events. | Select when board area is critical and surge threat level is defined per IEC 61000-4-5 Level 3 (1 kV). |
| 1.5KE120A | Through-hole TO-204AE (DO-201AE) package, identical electrical specs but higher RθJA (60 °C/W), no RoHS E3 suffix. | Used where manual assembly or legacy through-hole infrastructure remains; lacks MSL Level 1 reflow compatibility. | Choose for prototyping or low-volume repair where SMT infrastructure is unavailable. |
Compared with SMBJ120A-E3/52T and 1.5KE120A, the SMCJ120A-E3/9AT offers superior surge handling in a surface-mount format compatible with high-volume automated production and automotive reflow standards, making it optimal for industrial and automotive OEM applications demanding 1500 W immunity.
Availability
SMCJ120A-E3/9AT is available at Aetrix Electronics and suitable for industrial motor drives, automotive power distribution, telecom power supplies, and PLC I/O modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMCJ120A-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 high-power handling.
The SMCJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom systems where robustness against lightning, ESD, and inductive switching surges is mission-critical.
FAQ
What is the clamping voltage of the SMCJ120A-E3/9AT and how does it relate to system protection?
The SMCJ120A-E3/9AT has a maximum clamping voltage (VC) of 193 V at 7.8 A peak pulse current (IPPM) under 10/1000 µs waveform. This value defines the highest voltage seen by downstream components during a surge event. To ensure protection, the VC must remain below the absolute maximum voltage rating of the protected IC or MOSFET - for example, selecting this device for a 200 V-rated power switch provides a 7 V safety margin. The clamping performance is validated per ANSI/IEEE C62.35 and remains stable across its –55 °C to +150 °C operating range.
Is the SMCJ120A-E3/9AT suitable for automotive applications?
Yes, the SMCJ120A-E3/9AT is RoHS-compliant and meets MSL Level 1 reflow requirements (260 °C peak), making it suitable for automotive electronics manufacturing. While the base E3 suffix denotes commercial grade, Vishay offers AEC-Q101 qualified variants under HE3 suffix (e.g., SMCJ120AHE3_A/I). For production automotive use, confirm qualification status via Vishay's automotive ordering codes and consult the latest PPAP documentation. The device's 1500 W surge rating supports ISO 7637-2 Pulse 5a compliance when properly mounted on adequate copper area.
How does the SMCJ120A-E3/9AT differ from bidirectional TVS diodes like SMCJ120CA?
The SMCJ120A-E3/9AT is unidirectional and features a cathode band marking, allowing it to conduct only in reverse avalanche mode - ideal for DC-biased lines where forward conduction must be blocked. In contrast, SMCJ120CA is bidirectional with no polarity marking and symmetrical clamping in both directions, suited for AC signal lines or differential buses. Electrical parameters including VWM (120 V), VBR (133–147 V), and VC (193 V) are identical in magnitude, but the unidirectional version exhibits forward voltage drop (~3.5 V at 100 A) while the bidirectional shows no forward conduction path.
What PCB layout considerations are critical for optimal performance of the SMCJ120A-E3/9AT?
Optimal performance requires mounting the SMCJ120A-E3/9AT on minimum 8.0 mm × 8.0 mm copper pads per terminal, as specified in the datasheet for rated PPPM. Trace inductance must be minimized - keep traces short and wide between the TVS and protected node, and route directly to ground plane with multiple vias. Avoid routing sensitive signals near the device during clamping, as high di/dt can induce coupling. Thermal relief should be avoided on cathode/anode pads to maintain low RθJA (75 °C/W); verify copper weight and layer stack-up to sustain 6.5 W steady-state dissipation if needed.
Does the SMCJ120A-E3/9AT have a specified junction capacitance, and is it suitable for high-speed data lines?
No, the SMCJ120A-E3/9AT does not specify junction capacitance (CJ) in its datasheet - typical values for SMCJ-series unidirectional devices at 0 V bias range from 100 pF to 300 pF depending on voltage rating, and CJ increases significantly near VWM. With a 120 V standoff, its capacitance is too high for USB, HDMI, or Ethernet data lines, where sub-5 pF is typically required. It is intended for power rail and low-frequency signal protection (e.g., 24 V sensor inputs, relay coils, motor phases), not high-speed digital interfaces.
SMCJ120A-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:
- 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-E3/9AT FAQ
1.How can I place an order for SMCJ120A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ120A-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 SMCJ120A-E3/9AT reliable?
The price and inventory of SMCJ120A-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 SMCJ120A-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ120A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ120A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ120A-E3/9AT?
SMCJ120A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ120A-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 SMCJ120A-E3/9AT?
For technical support, including SMCJ120A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ120A-E3/9AT requirements.
6.How does Aetrix verify that SMCJ120A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ120A-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 SMCJ120A-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ120A-E3/9AT?
All SMCJ120A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ120A-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 SMCJ120A-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ120A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ120A-E3/9AT Tags
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