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Vishay General Semiconductor - Diodes Division SMCJ18HE3/9AT
- Part No.:
- SMCJ18HE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ18HE3/9AT.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,530
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Product details
Overview
SMCJ18HE3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, designed for robust overvoltage protection of sensitive electronics. It features a 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (10/1000 µs), clamping voltage of 29.2 V at 51.4 A, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SMCJ18HE3/9AT datasheet, SMCJ18HE3/9AT pinout, SMCJ18HE3/9AT application, or SMCJ18HE3/9AT equivalent, this device is selected for high-energy surge suppression in DC power rails, automotive ECUs, industrial sensor interfaces, and MOSFET gate protection where low clamping ratio, fast response (<1 ns), and RoHS-compliant, whisker-tested (JESD 201 Class 2) terminations are required.
Technical Context
The SMCJ18HE3/9AT operates as a silicon avalanche diode with unidirectional polarity-cathode marked by a band-and exhibits low incremental surge resistance and excellent clamping capability under standardized 10/1000 µs transients. Its glass-passivated junction ensures stable breakdown behavior and long-term reliability across -55 °C to +150 °C operating temperature range.
Thermal performance is defined by RθJA = 75 °C/W (on recommended 8.0 mm × 8.0 mm copper pads) and RθJL = 15 °C/W, enabling effective heat dissipation during repetitive surge events. The device meets MSL Level 1 per J-STD-020 and is rated for 200 A non-repetitive forward surge current (8.3 ms half-sine).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 12–15 V DC systems. |
| VBR (min/max) | 20.0 V / 22.1 V at 1 mA - Confirmed avalanche breakdown range; ensures predictable turn-on within ±5.5% tolerance. |
| VC @ IPPM | 29.2 V at 51.4 A - Clamped voltage during 1500 W transient; yields clamping ratio of 1.62, critical for protecting 3.3 V/5 V logic downstream. |
| PPPM | 1500 W (10/1000 µs) - Peak surge energy handling capacity; supports IEC 61000-4-5 Level 4 (4 kV) compliance with proper layout. |
| ID @ VWM | 1.0 µA - Ultra-low leakage at rated stand-off; minimizes standby power loss in battery-powered applications. |
| TJ max. | +150 °C - Junction temperature limit enabling operation in under-hood automotive environments and industrial enclosures. |
| Qualification | AEC-Q101 qualified - Validated for automotive electronic modules requiring zero defects and extended lifetime under thermal cycling and humidity stress. |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity indicated by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | Connected to protected circuit ground or low-side return path; enables clamping when cathode voltage exceeds VWM + VBR. |
| Cathode | Current exit terminal in forward bias; marked with band | Connected to line/voltage rail being protected; avalanche conduction occurs when rail voltage exceeds VBR relative to anode. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable, repeatable breakdown voltage and long-term reliability under repeated surge stress without parameter drift. |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, body control, and ADAS modules where failure modes must meet ISO 26262 ASIL-aware requirements. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., load dump, inductive kick), improving protection margin for downstream ICs. |
| JESD 201 Class 2 whisker resistance | Guarantees mechanical integrity of matte tin terminations under thermal cycling and long-term storage-critical for high-reliability industrial assemblies. |
| MSL Level 1 (260 °C peak) | Enables standard reflow soldering without moisture-related popcorning; eliminates pre-bake requirement for production throughput. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply lines in engine control units (ECUs) against load dump (ISO 16750-2) and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and local regulator input to clamp transients before they reach LDOs or microcontrollers. Use Value: Withstands 1500 W pulses and clamps to 29.2 V, ensuring downstream 3.3 V/5 V logic remains below absolute maximum ratings during 35 V/100 ms load dump events. |
Use Scenario: Shielding analog front-end inputs of pressure/temperature sensors in factory automation PLCs from ESD and switching noise. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt fast transients (<1 ns response) before signal conditioning amplifiers. Use Value: 1.0 µA leakage at 18 V preserves sensor offset accuracy; 29.2 V clamping prevents amplifier saturation during 4 kV contact ESD (IEC 61000-4-2). |
| MOSFET Gate Protection | DC-DC Converter Input Stage |
Use Scenario: Safeguarding N-channel MOSFET gates in motor drivers from inductive flyback spikes during PWM switching. IC Role / Device Role / Timing Role: Placed between gate and source to clamp gate-source voltage to ≤29.2 V, preventing oxide breakdown. Use Value: Fast avalanche response (<1 ns) limits gate overvoltage duration; low VBR tolerance (±5.5%) ensures consistent turn-on across production lots. |
Use Scenario: Input surge suppression for 24 V input buck converters in telecom power supplies subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Primary TVS on bulk input capacitor rail to absorb 1500 W transients before upstream EMI filter and controller IC. Use Value: 1500 W PPPM rating allows single-device coverage of IEC 61000-4-5 Combination Wave (2 Ω/12 Ω) test levels without parallel staging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A-E3/61T | Lower PPPM (400 W), smaller SMA package (DO-214AC), same VWM/VBR range. | Suitable only for lower-energy transients (e.g., ESD-only); not rated for load dump or IEC 61000-4-5 Level 4. | Select when board space is constrained and surge threat level is limited to <400 W. |
| SMCJ18AHE3/9AT | Identical electrical specs and AEC-Q101 qualification; differs only in marking code (no "H" suffix in part number but same HE3/9AT packaging). | No functional difference; alternate ordering variant with identical performance and qualification. | Use interchangeably-same device, different internal traceability marking convention. |
Compared with SMCJ18HE3/9AT, SMAJ18A-E3/61T offers footprint savings but sacrifices 73% peak power handling, while SMCJ18AHE3/9AT is electrically and qualitatively identical-making it a direct logistics alternative rather than a technical substitute.
Availability
SMCJ18HE3/9AT is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface protection, MOSFET gate protection, DC-DC converter input stages, and telecom surge suppression requiring stable component supply and AEC-Q101 assurance.
Supply support for SMCJ18HE3/9AT 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 automotive-grade qualification.
The SMCJ series targets high-energy transient suppression in harsh environments-designed specifically for automotive, industrial, and telecom applications demanding AEC-Q101 validation, low clamping ratio, and robust thermal performance.
FAQ
What is the clamping voltage of the SMCJ18HE3/9AT and how does it protect downstream components?
The SMCJ18HE3/9AT clamps to 29.2 V at its rated peak pulse current of 51.4 A (10/1000 µs waveform). This clamping voltage establishes a hard upper limit on transient overvoltage seen by downstream ICs, ensuring that sensitive 3.3 V or 5 V logic remains within absolute maximum ratings. Its low clamping ratio (VC/VBR ≈ 1.62) reflects efficient energy diversion, minimizing stress on protected circuits during fast-rising surges like inductive switch-off or ESD.
Is the SMCJ18HE3/9AT suitable for automotive applications, and what qualifications does it hold?
Yes, the SMCJ18HE3/9AT is explicitly AEC-Q101 qualified and intended for automotive use. It meets stringent stress tests including temperature cycling, humidity bias, and mechanical shock-validating reliability in engine compartments and body control modules. Its DO-214AB package is rated MSL Level 1 (260 °C peak reflow), and its JESD 201 Class 2 whisker resistance ensures long-term solder joint integrity under thermal cycling-key for automotive longevity requirements.
How does the SMCJ18HE3/9AT differ from the bi-directional SMCJ18CA variant?
The SMCJ18HE3/9AT is unidirectional with a cathode band marking and conducts only in reverse breakdown; it blocks forward current beyond ~3.5 V. In contrast, SMCJ18CA is bi-directional-symmetrical in both directions-with no polarity marking and identical VBR in positive and negative quadrants. Use SMCJ18HE3/9AT for DC rail protection where polarity is fixed; choose SMCJ18CA only for AC-coupled or dual-polarity signal lines.
What is the thermal resistance of the SMCJ18HE3/9AT, and how does it affect PCB layout?
The SMCJ18HE3/9AT has RθJA = 75 °C/W when mounted on the minimum recommended 8.0 mm × 8.0 mm copper pads per terminal. This value assumes standard JEDEC test conditions-larger copper areas reduce thermal resistance further. For reliable operation under repetitive surges, designers must allocate adequate copper pour area and avoid narrow traces; insufficient copper increases junction temperature, derating peak power and shortening device life.
Does the SMCJ18HE3/9AT have RoHS and halogen-free compliance documentation?
Yes, the SMCJ18HE3/9AT carries the "E3" suffix indicating RoHS compliance per Directive 2011/65/EU, and Vishay certifies all E3-marked parts as meeting JEDEC JS709A halogen-free standards. Material declarations and compliance certificates are available via Vishay's official portal (doc?99912), and the device is categorized as "Green" in Vishay's material policy-ensuring environmental compliance for global electronics manufacturing.
SMCJ18HE3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 32.2V
- Current - Peak Pulse (10/1000µs):
- 46.6A
- 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)
SMCJ18HE3/9AT FAQ
1.How can I place an order for SMCJ18HE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ18HE3/9AT 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 SMCJ18HE3/9AT reliable?
The price and inventory of SMCJ18HE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ18HE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ18HE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ18HE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ18HE3/9AT?
SMCJ18HE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ18HE3/9AT 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 SMCJ18HE3/9AT?
For technical support, including SMCJ18HE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ18HE3/9AT requirements.
6.How does Aetrix verify that SMCJ18HE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ18HE3/9AT 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 SMCJ18HE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ18HE3/9AT?
All SMCJ18HE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ18HE3/9AT, 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 SMCJ18HE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ18HE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ18HE3/9AT Tags
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Diodes Incorporated
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