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Vishay General Semiconductor - Diodes Division SMCJ18CHE3/9AT
- Part No.:
- SMCJ18CHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ18CHE3/9AT.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,212
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Product details
Overview
SMCJ18CHE3/9AT from Vishay General Semiconductor is a bi-directional 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), 1500 W peak pulse power (PPPM), and clamps transients to ≤29.2 V at 51.4 A, commonly used in automotive power line and sensor interface protection.
For engineers reviewing the SMCJ18CHE3/9AT datasheet, SMCJ18CHE3/9AT pinout, SMCJ18CHE3/9AT application, or SMCJ18CHE3/9AT equivalent, key selection criteria include its AEC-Q101 qualification, bi-directional surge capability, low clamping ratio (VC/VBR ≈ 1.46), RoHS-compliant HE3 suffix, and compatibility with 10/1000 µs surge waveforms in harsh environments.
Technical Context
The SMCJ18CHE3/9AT operates as a bi-directional avalanche diode, symmetrically clamping voltage surges above its breakdown threshold in both polarities. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, enabling fast response (<1 ns) to ESD and lightning-induced transients.
Designed for surface-mount placement on 8.0 mm × 8.0 mm copper pads, it delivers 1500 W peak pulse power under JEDEC-standard 10/1000 µs waveform while maintaining thermal resistance RθJA = 75 °C/W and operating junction temperature up to +150 °C - critical for under-hood automotive modules and industrial I/O interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V reverse stand-off voltage - defines maximum continuous working voltage before clamping begins |
| VBR min/max | 20.0 V / 22.1 V at 1.0 mA test current - ensures reliable triggering across production lot and temperature range |
| VC @ IPPM | 29.2 V at 51.4 A - clamping voltage during 10/1000 µs surge, limiting stress on downstream ICs |
| PPPM | 1500 W - peak pulse power handling per single transient event without degradation |
| ID @ VWM | 1.0 µA max leakage - minimizes standby power loss in battery-powered systems |
| TJ max | +150 °C - supports operation in high-temperature automotive and industrial enclosures |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, bi-directional device with no polarity marking - symmetrical terminals enable flexible PCB layout without orientation constraints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; conducts bidirectionally when voltage exceeds ±VBR |
| Case | Thermal and mechanical anchor | DO-214AB molded body provides UL 94 V-0 flammability rating and 0.260" × 0.320" footprint |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Protects AC-coupled and floating signal lines without polarity concerns - ideal for CAN, LIN, and sensor differential pairs |
| AEC-Q101 qualification | Validated for automotive powertrain and chassis applications requiring zero field failure risk over 15-year service life |
| Low clamping ratio (VC/VBR) | 1.46 typical - reduces voltage overshoot margin needed for protected ICs' absolute maximum ratings |
| HE3 suffix | JESD 201 Class 2 whisker resistance - ensures long-term solder joint integrity in high-vibration environments |
| MSL Level 1 | Unlimited floor life at ≤30 °C/60% RH - eliminates bake requirements prior to reflow assembly |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump (ISO 7637-2 Pulse 5a) and alternator transients. IC Role / Device Role / Timing Role: Primary clamping element placed at board entry point, shunting >100 V spikes to ground before reaching DC-DC converters and microcontrollers. Use Value: Withstands 1500 W surges and clamps to 29.2 V, ensuring downstream components remain within safe operating area per AEC-Q100 stress limits. | Use Scenario: Shielding analog front-end circuits of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Bi-directional TVS across differential input pins (e.g., RS-485, analog sensor outputs), suppressing EFT bursts and cable discharge events. Use Value: Symmetric clamping prevents signal inversion or latch-up during ±2 kV ESD contact discharge (IEC 61000-4-2), preserving measurement accuracy. |
| Telecom Data Line Surge Suppression | Consumer Appliance Motor Drive Protection |
Use Scenario: Safeguarding Ethernet PHY interfaces in outdoor network equipment exposed to induced lightning surges. IC Role / Device Role / Timing Role: First-stage protector on RJ45 magnetics secondary side, limiting common-mode transients before choke and transformer isolation. Use Value: 1500 W PPPM rating handles multi-kA induced surges per ITU-T K.21 recommendations, reducing need for cascaded protection stages. | Use Scenario: Guarding MCU GPIOs and gate drivers controlling BLDC motors in smart home appliances. IC Role / Device Role / Timing Role: Localized TVS on motor control PCB near MOSFETs, absorbing inductive kickback from commutation switching. Use Value: Fast <1 ns response and 29.2 V clamping prevent gate oxide rupture in 30 V-rated logic-level MOSFETs during 100 ns edge transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA | 600 W PPPM, same VWM/VBR, SMB package (smaller footprint, lower thermal mass) | Lower surge capacity suits consumer-grade USB/UART ports; not recommended for automotive load dump | Select when space-constrained and peak surge energy is ≤600 W |
| SMCJ18AHE3/9AT | Uni-directional variant with cathode band marking; identical VWM/VBR/PPPM but asymmetric conduction | Required only where DC bias exists (e.g., 12 V supply rail); unsuitable for AC or floating signals | Choose only if circuit topology mandates unidirectional clamping and polarity is fixed |
Compared with SMBJ18CA and SMCJ18AHE3/9AT, the SMCJ18CHE3/9AT uniquely combines AEC-Q101 qualification, 1500 W surge capacity, and bi-directional symmetry - making it the sole choice for automotive sensor buses and isolated industrial data links requiring polarity-agnostic protection.
Availability
SMCJ18CHE3/9AT is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor nodes, telecom infrastructure interfaces, and appliance motor drive systems requiring stable component supply across extended production lifecycles.
Supply support for SMCJ18CHE3/9AT 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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for demanding industrial and automotive applications.
The SMCJ series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in safety-critical systems where AEC-Q101 compliance and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of the SMCJ18CHE3/9AT under a 10/1000 µs surge?
The SMCJ18CHE3/9AT clamps to a maximum of 29.2 V when subjected to its rated peak pulse current of 51.4 A using the standard 10/1000 µs waveform. This value is measured at the device terminals under JEDEC-defined conditions and reflects worst-case voltage seen by protected circuitry during surge events.
Is the SMCJ18CHE3/9AT suitable for automotive applications?
Yes, the SMCJ18CHE3/9AT carries full AEC-Q101 qualification, including testing for temperature cycling, high-temperature reverse bias, and ESD robustness. Its DO-214AB package, HE3 whisker-resistant plating, and 150 °C junction rating make it appropriate for under-hood and cabin ECU designs per ISO 16750 and ISO 7637-2 requirements.
How does the bi-directional design of the SMCJ18CHE3/9AT affect PCB layout?
The SMCJ18CHE3/9AT has no polarity marking and identical electrical behavior in both directions, eliminating orientation constraints during automated placement. This simplifies layout for differential signals, AC-coupled lines, or floating grounds - unlike uni-directional variants such as SMCJ18AHE3/9AT which require cathode alignment.
What is the meaning of the 'HE3' suffix in SMCJ18CHE3/9AT?
The 'HE3' suffix indicates RoHS-compliant construction with JESD 201 Class 2 whisker resistance, achieved via matte tin plating meeting strict intermetallic growth limits. It also denotes AEC-Q101 qualification - distinguishing it from commercial-grade 'E3' variants like SMCJ18CE3/9AT which lack automotive validation.
Can the SMCJ18CHE3/9AT replace the SMCJ18AHE3/9AT in a design?
No - the SMCJ18CHE3/9AT is bi-directional while the SMCJ18AHE3/9AT is uni-directional. Substituting them requires verifying circuit polarity: SMCJ18CHE3/9AT may be used in place of SMCJ18AHE3/9AT only if the protected node is floating or AC-coupled; otherwise, reverse conduction could cause malfunction or damage.
SMCJ18CHE3/9AT 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:
- -
- Bidirectional Channels:
- 1
- 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)
SMCJ18CHE3/9AT FAQ
1.How can I place an order for SMCJ18CHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ18CHE3/9AT 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 SMCJ18CHE3/9AT reliable?
The price and inventory of SMCJ18CHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ18CHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ18CHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ18CHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ18CHE3/9AT?
SMCJ18CHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ18CHE3/9AT 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 SMCJ18CHE3/9AT?
For technical support, including SMCJ18CHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ18CHE3/9AT requirements.
6.How does Aetrix verify that SMCJ18CHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ18CHE3/9AT 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 SMCJ18CHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ18CHE3/9AT?
All SMCJ18CHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ18CHE3/9AT, 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 SMCJ18CHE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ18CHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ18CHE3/9AT Tags
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