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Vishay General Semiconductor - Diodes Division SMCJ18CHE3/57T
- Part No.:
- SMCJ18CHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ18CHE3/57T.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,574
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Product details
Overview
SMCJ18CHE3/57T 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 standoff voltage (VWM), 20.0–22.1 V breakdown range (VBR), 1500 W peak pulse power (PPPM), and clamps transients to ≤29.2 V at 51.4 A, commonly used on DC power rails and I/O lines in automotive ECUs and industrial controllers.
For engineers reviewing the SMCJ18CHE3/57T datasheet, SMCJ18CHE3/57T pinout, SMCJ18CHE3/57T application, or SMCJ18CHE3/57T equivalent, key selection criteria include its AEC-Q101 qualification, 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ18CHE3/57T operates as a silicon avalanche diode that enters breakdown when reverse voltage exceeds its VBR threshold (20.0–22.1 V), diverting surge current away from protected circuitry. Its unidirectional polarity-marked with a cathode band-enables integration into DC-biased lines without forward conduction during normal operation.
It delivers 1500 W peak pulse power under 10/1000 μs waveform per JEDEC standards, with thermal resistance RθJA = 75 °C/W and RθJL = 15 °C/W, supporting reliable operation up to 150 °C junction temperature. The device meets MSL Level 1 and JESD201 Class 2 whisker testing requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 20.0 V / 22.1 V - Breakdown occurs within this range at 1 mA test current, defining turn-on threshold |
| VC @ IPPM | 29.2 V - Clamped voltage at 51.4 A peak surge current, limiting stress on downstream ICs |
| PPPM | 1500 W - Peak transient energy handling capability under standardized 10/1000 μs waveform |
| TJ max | +150 °C - Maximum allowable junction temperature, enabling use in under-hood automotive environments |
| Package | DO-214AB (SMCJ) - Surface-mount package with 8.0 mm × 8.0 mm thermal pad footprint for effective heat dissipation |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
DO-214AB (SMCJ) package: molded plastic case with J-bend leads, matte tin-plated terminals solderable per J-STD-002 and JESD22-B102; cathode indicated by band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration |
| Cathode (banded end) | Reverse-biased clamping terminal | Connected to protected line (e.g., 12 V rail); conducts only during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable avalanche characteristics and long-term reliability under repeated surge stress |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving protection margin for downstream MOSFETs and ICs |
| MSL Level 1 rating | Enables standard reflow assembly without moisture sensitivity concerns or baking requirements |
| AEC-Q101 qualification | Validates suitability for automotive applications including engine control, body electronics, and ADAS sensor interfaces |
| RoHS-compliant HE3 suffix | Indicates AEC-Q101 qualified, halogen-free, and JESD201 Class 2 whisker-tested construction |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply lines in engine control units against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between battery rail and system input filter capacitor. Use Value: Limits transient voltage to ≤29.2 V during 1500 W surges, preventing damage to MCU power management ICs rated for 30 V absolute maximum. | Use Scenario: Safeguarding analog output lines of pressure or temperature sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Reverse-biased protection element on 4–20 mA current loop outputs exposed to field wiring ESD and cable coupling. Use Value: Responds in <1 ps to clamp fast transients while maintaining <1 µA leakage at 18 V, preserving signal accuracy and loop integrity. |
| DC-DC Converter Input Protection | Telecom Line Card Surge Suppression |
Use Scenario: Shielding buck converter inputs in PoE-powered devices from Ethernet cable-induced surges. IC Role / Device Role / Timing Role: Primary-level TVS on 48 V input stage upstream of input EMI filter and controller IC. Use Value: Handles repetitive 10/1000 μs surges up to 51.4 A without degradation, ensuring sustained protection across product lifetime. | Use Scenario: Front-end protection for AC/DC power supplies in telecom base station line cards subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Standoff-rated suppressor on primary-side rectifier output, coordinated with MOV and fuse. Use Value: Provides precise 18 V clamping threshold and 1500 W rating to complement upstream coarse protection and avoid over-clamp stress on downstream regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18AHE3/A | Lower PPPM (400 W), smaller SMA package (DO-214AC), same VWM/VBR range | Suitable for space-constrained, lower-energy applications like USB ports or low-power sensors | Select when board area is critical and surge threat level is ≤400 W; not drop-in due to different thermal pad layout |
| 1.5KE18A | Through-hole TO-218 package, same 18 V VWM, but higher VC (29.5 V) and lower thermal performance | Used in legacy industrial power supplies where manual assembly or high-reliability through-hole mounting is required | Choose for repair/refurbishment of existing through-hole designs; requires PCB redesign for SMT migration |
Compared with SMAJ18AHE3/A and 1.5KE18A, the SMCJ18CHE3/57T offers superior 1500 W surge capacity and AEC-Q101 qualification in a surface-mount DO-214AB package optimized for automotive and high-reliability industrial use-making it the preferred choice where energy handling, thermal robustness, and automotive compliance are mandatory.
Availability
SMCJ18CHE3/57T is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and DC-DC converter input surge suppression requiring stable component supply across extended production cycles.
Supply support for SMCJ18CHE3/57T 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, TVS devices, and optoelectronics with emphasis on reliability and application-specific performance.
The SMCJ series belongs to Vishay's TRANSZORB® family of transient voltage suppressors, engineered specifically for high-energy surge immunity in automotive, industrial, and telecom infrastructure applications where AEC-Q101 compliance and 1500 W pulse handling are essential.
FAQ
What is the clamping voltage of the SMCJ18CHE3/57T at its rated peak pulse current?
The SMCJ18CHE3/57T clamps to a maximum of 29.2 V at its specified peak pulse current of 51.4 A under a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 standards and ensures downstream components see limited overvoltage stress during surge events. The clamping behavior is defined by its silicon avalanche junction and remains stable across temperature and lifetime when operated within datasheet limits.
Is the SMCJ18CHE3/57T suitable for automotive applications?
Yes, the SMCJ18CHE3/57T is AEC-Q101 qualified and explicitly rated for automotive use. Its construction includes glass-passivated junction, JESD201 Class 2 whisker resistance, MSL Level 1 moisture sensitivity, and operation up to +150 °C junction temperature-meeting critical requirements for engine control, body electronics, and ADAS subsystems. The HE3 suffix confirms this qualification status.
How does the SMCJ18CHE3/57T differ from the bi-directional SMCJ18CA variant?
The SMCJ18CHE3/57T is unidirectional with a cathode band marking and blocks forward current above ~3.5 V, whereas SMCJ18CA is bi-directional with no polarity marking and clamps in both directions. Their VWM (18 V), VBR (20.0–22.1 V), and PPPM (1500 W) are identical, but SMCJ18CHE3/57T must be oriented correctly in-circuit, while SMCJ18CA can protect AC or floating lines without orientation concern.
What is the thermal resistance of the SMCJ18CHE3/57T, and how does it affect layout design?
The SMCJ18CHE3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead (RθJL) of 15 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per Vishay's recommended layout. To maintain safe junction temperatures under repeated surges, PCB land patterns must match this pad size and use internal copper planes for heat spreading-undersized pads will cause excessive temperature rise and premature failure.
Does the SMCJ18CHE3/57T require derating at elevated ambient temperatures?
Yes, the SMCJ18CHE3/57T must be derated above TA = 25 °C per Figure 2 in the Vishay datasheet (Document Number 88394). Its peak pulse power drops linearly to zero at +150 °C ambient, and its maximum clamping performance degrades with rising junction temperature. For operation at 85 °C ambient, the effective PPPM is reduced to approximately 1050 W-designers must verify worst-case surge energy against this derated value.
SMCJ18CHE3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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)
SMCJ18CHE3/57T FAQ
1.How can I place an order for SMCJ18CHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ18CHE3/57T 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 SMCJ18CHE3/57T reliable?
The price and inventory of SMCJ18CHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ18CHE3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ18CHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ18CHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ18CHE3/57T?
SMCJ18CHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ18CHE3/57T 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 SMCJ18CHE3/57T?
For technical support, including SMCJ18CHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ18CHE3/57T requirements.
6.How does Aetrix verify that SMCJ18CHE3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ18CHE3/57T 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 SMCJ18CHE3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ18CHE3/57T?
All SMCJ18CHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ18CHE3/57T, 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 SMCJ18CHE3/57T part is unused and in its original packaging.
Return procedure for SMCJ18CHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ18CHE3/57T Tags
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