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Vishay General Semiconductor - Diodes Division SMCJ120AHE3/9AT
- Part No.:
- SMCJ120AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ120AHE3/9AT.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,462
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Product details
Overview
SMCJ120AHE3/9AT 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 is AEC-Q101 qualified for automotive electronics.
For engineers reviewing the SMCJ120AHE3/9AT datasheet, SMCJ120AHE3/9AT pinout, SMCJ120AHE3/9AT application, or SMCJ120AHE3/9AT equivalent, key selection criteria include clamping performance under 10/1000 μs transients, thermal resistance (RθJA = 75 °C/W), unidirectional polarity marking, AEC-Q101 qualification status, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ120AHE3/9AT uses a glass-passivated silicon junction to achieve fast response time (<1 ps) and low incremental surge resistance, enabling effective suppression of inductive switching spikes and lightning-induced surges. Its unidirectional configuration provides reverse-biased clamping only, with cathode band marking for polarity identification.
Rated for operation from –55 °C to +150 °C, it supports high-reliability deployment in automotive powertrain and body control modules where sustained junction temperature management and MSL Level 1 moisture sensitivity compliance (peak reflow 260 °C) are required. The device meets UL 497B recognition (QVGQ2) and JEDEC JESD22-B102 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe signal line operating margin. |
| VBR (min/max) | 133 V / 147 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 193 V at 7.8 A - Clamped voltage under 10/1000 μs surge; determines maximum stress imposed on protected IC or MOSFET. |
| PPPM | 1500 W - Peak transient energy handling capacity; enables robust protection against ISO 7637-2 Pulse 5a/b and IEC 61000-4-5 surges. |
| TJ max. | +150 °C - Maximum junction temperature rating; supports under-hood automotive environments without derating below 125 °C ambient. |
| RθJA | 75 °C/W - Thermal resistance from junction to ambient on standard PCB pad layout; informs heatsinking requirements for repetitive surge duty. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including HTOL, TC, UHAST, and ESD testing per AEC specification. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, matte tin-plated leads, RoHS-compliant and halogen-free (HE3 suffix), MSL Level 1 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased clamping node | Connected to protected line (e.g., 12 V rail); conducts surge current to ground when voltage exceeds VBR. |
| Anode | Reference/ground return path | Typically tied to system ground plane; completes clamping loop and must maintain low-inductance connection for effective transient shunting. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over lifetime and improved humidity resistance vs. epoxy-passivated alternatives. |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, ADAS, and body electronics without additional qualification effort. |
| Low incremental surge resistance | Minimizes VC rise under high di/dt transients, preserving margin between clamped voltage and protected device's absolute maximum rating. |
| MSL Level 1 rating | Enables direct placement into standard SMT reflow profiles (peak 260 °C) without baking or special handling. |
| UL 497B recognition (QVGQ2) | Confirms compliance with telecom and industrial surge protector safety standards for both uni- and bidirectional variants. |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
|
Use Scenario: Protection of 12 V battery-fed ECUs against load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input stage of power management IC or microcontroller. Use Value: Clamps transients to ≤193 V while sustaining 1500 W peak power, preventing latch-up or gate oxide damage in downstream MOSFETs and regulators. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events in factory automation systems. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted directly at connector interface to suppress ±8 kV contact ESD (IEC 61000-4-2) before signal conditioning circuitry. Use Value: Sub-1 ns response time limits voltage overshoot to <200 V, preserving ADC reference integrity and avoiding comparator false triggering. |
| Telecom DC Power Feeds | Consumer Appliance Motor Drivers |
|
Use Scenario: Safeguarding PoE-powered equipment inputs against induced surges on long outdoor DC runs. IC Role / Device Role / Timing Role: Primary surge clamp on 48 V DC input stage upstream of DC/DC converter and Ethernet PHY. Use Value: Withstands repeated 10/1000 μs surges up to 1500 W, maintaining VWM = 120 V headroom above nominal 48 V supply for margin against brownouts. |
Use Scenario: Protecting H-bridge gate drivers from inductive kickback during BLDC motor commutation in smart home appliances. IC Role / Device Role / Timing Role: TVS placed across motor phase terminals or between driver output and ground to clamp flyback spikes. Use Value: 200 A non-repetitive forward surge rating (IFSM) handles worst-case commutation energy without degradation, ensuring long-term reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ120AHE3/9AT | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W). | Suitable for lower-energy surges (e.g., IEC 61000-4-2 ESD only); not rated for ISO 7637-2 load dump. | Select when board space is constrained and surge energy is limited to ≤400 W. |
| SMCJ120CAHE3/9AT | Bidirectional variant; same VWM (120 V), symmetric clamping in both polarities; no cathode band marking. | Required for AC-coupled or dual-polarity signal lines (e.g., RS-485, CAN bus) where reverse polarity transients occur. | Choose for bidirectional protection needs; not interchangeable without circuit redesign due to polarity and marking differences. |
Compared with SMAJ120AHE3/9AT, the SMCJ120AHE3/9AT offers 275 % higher surge power handling and better thermal performance; versus SMCJ120CAHE3/9AT, it provides optimized unidirectional clamping with explicit polarity identification for DC rail protection.
Availability
SMCJ120AHE3/9AT is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, telecom power supplies, and consumer appliance motor drives requiring stable component supply and AEC-Q101 assurance.
Supply support for SMCJ120AHE3/9AT 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-power transient suppression in harsh environments-designed to meet automotive, industrial, and telecom surge immunity standards while supporting automated manufacturing and long-term field stability.
FAQ
What is the clamping voltage of the SMCJ120AHE3/9AT under a 10/1000 μs surge?
The SMCJ120AHE3/9AT clamps to a maximum of 193 V when subjected to its rated peak pulse current of 7.8 A using the standardized 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and verified at TA = 25 °C on recommended 8.0 mm × 8.0 mm copper pads. The SMCJ120AHE3/9AT maintains this clamping performance across its full operating temperature range.
Is the SMCJ120AHE3/9AT suitable for automotive applications?
Yes, the SMCJ120AHE3/9AT carries AEC-Q101 qualification, confirming compliance with stress tests including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing. Its 150 °C maximum junction temperature, MSL Level 1 rating, and UL 497B recognition make it appropriate for under-hood and chassis-mounted automotive systems. The SMCJ120AHE3/9AT is explicitly designated for automotive use via its HE3 suffix.
How does the SMCJ120AHE3/9AT differ from the SMCJ120CAHE3/9AT?
The SMCJ120AHE3/9AT is unidirectional with cathode band marking and clamps only in reverse bias, whereas the SMCJ120CAHE3/9AT is bidirectional with symmetrical clamping in both polarities and no polarity marking. Their VWM, VBR, and VC values are identical, but the SMCJ120AHE3/9AT cannot replace the CA version in AC or dual-polarity circuits without redesign. The SMCJ120AHE3/9AT is intended for DC rail protection where polarity is fixed.
What is the thermal resistance of the SMCJ120AHE3/9AT, and how does it affect layout?
The SMCJ120AHE3/9AT 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 no additional heatsinking; reducing pad area or omitting thermal vias increases RθJA and risks exceeding TJ max. = 150 °C during repetitive surges. Layout must preserve these pad dimensions to ensure rated PPPM and lifetime reliability of the SMCJ120AHE3/9AT.
Does the SMCJ120AHE3/9AT have UL recognition?
Yes, the SMCJ120AHE3/9AT holds Underwriters Laboratories recognition under UL 497B (QVGQ2) for protectors, covering both unidirectional and bidirectional configurations in the SMCJ family. This certification validates its safety performance in telecom, industrial, and automotive surge protection applications, including dielectric withstand and flammability (UL 94 V-0) compliance of the SMC (DO-214AB) molding compound. The SMCJ120AHE3/9AT is listed in UL file E136766.
SMCJ120AHE3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ120AHE3/9AT FAQ
1.How can I place an order for SMCJ120AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ120AHE3/9AT 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 SMCJ120AHE3/9AT reliable?
The price and inventory of SMCJ120AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ120AHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ120AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ120AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ120AHE3/9AT?
SMCJ120AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ120AHE3/9AT 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 SMCJ120AHE3/9AT?
For technical support, including SMCJ120AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ120AHE3/9AT requirements.
6.How does Aetrix verify that SMCJ120AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ120AHE3/9AT 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 SMCJ120AHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ120AHE3/9AT?
All SMCJ120AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ120AHE3/9AT, 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 SMCJ120AHE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ120AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ120AHE3/9AT Tags
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