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Vishay General Semiconductor - Diodes Division SMCJ18HE3/57T
- Part No.:
- SMCJ18HE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ18HE3/57T.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,151
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Product details
Overview
SMCJ18HE3/57T 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 voltage (VBR), 1500 W peak pulse power (PPPM), and clamps transients to ≤29.2 V at 51.4 A IPPM - ideal for protecting automotive power rails and industrial sensor interfaces.
For engineers reviewing the SMCJ18HE3/57T datasheet, SMCJ18HE3/57T pinout, SMCJ18HE3/57T application, or SMCJ18HE3/57T equivalent, key selection criteria include its AEC-Q101 qualification, 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT assembly on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ18HE3/57T operates as a unidirectional avalanche diode, leveraging glass-passivated silicon junctions to achieve sub-nanosecond response to ESD and lightning-induced surges. Its clamping behavior follows the 10/1000 μs waveform standard per ANSI/IEEE C62.35, with thermal resistance RθJA = 75 °C/W and RθJL = 15 °C/W enabling reliable operation under repetitive surge conditions up to 150 °C junction temperature.
Marked with "BET" code and cathode band polarity, it supports high-reliability automotive applications per AEC-Q101 stress testing - including temperature cycling, humidity bias, and mechanical shock - while maintaining <1.0 μA reverse leakage at 18 V and 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 20.0 V / 22.1 V at 1.0 mA IT - ensures predictable avalanche turn-on across production lot |
| VC @ IPPM | 29.2 V at 51.4 A - defines worst-case clamped voltage during 10/1000 μs surge |
| PPPM | 1500 W - peak transient power handling capability without failure |
| TJ max | +150 °C - enables use in under-hood automotive environments and industrial enclosures |
| IFSM | 200 A - single half-sine surge current rating (8.3 ms), critical for load-dump immunity |
| Leakage ID | ≤1.0 μA at VWM - minimizes standby power loss in battery-powered systems |
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. Cathode identified by molded band; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-impedance return path; must be routed with minimal inductance for effective clamping |
| Cathode | High-side connection point | Connected to protected line (e.g., 12 V rail); marked by visible band; reverse-biased during normal operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HAST, and mechanical shock per JESD22 standards |
| Glass passivated junction | Ensures stable VBR and low leakage over lifetime, even under high-humidity or thermal stress conditions |
| MSL Level 1 (260 °C) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns |
| Low incremental surge resistance | Enables tighter clamping (29.2 V at 51.4 A) versus higher-Rsurge competitors, reducing stress on downstream ICs |
| RoHS-compliant HE3 suffix | Meets JESD201 Class 2 whisker resistance, suitable for long-life industrial and automotive deployments |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply lines in engine control units (ECUs) against ISO 7637-2 load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC input, clamping surges within nanoseconds. Use Value: Withstands 200 A IFSM and clamps to ≤29.2 V, preventing damage to LDOs and microcontrollers rated for ≤36 V absolute max. |
Use Scenario: Safeguarding analog inputs of pressure/temperature sensors in factory automation PLC modules exposed to relay coil flyback. IC Role / Device Role / Timing Role: Parallel-connected TVS at sensor connector, shunting inductive kickback before it reaches signal conditioning circuitry. Use Value: 1.0 μA leakage at 18 V avoids measurement offset; 1500 W PPPM handles repeated 100 V/10 A transients without degradation. |
| Telecom Line Card Surge Protection | Consumer Power Adapter Input Stage |
Use Scenario: Front-end protection of PoE-powered Ethernet switches against lightning-induced common-mode surges on 48 V DC input. IC Role / Device Role / Timing Role: Unidirectional TVS on primary side of isolated DC-DC converter, referenced to chassis ground. Use Value: AEC-Q101 qualification ensures long-term stability in telecom infrastructure; 150 °C TJ max supports operation in sealed cabinets. |
Use Scenario: Overvoltage clamp on AC-DC adapter secondary output (e.g., 19 V laptop adapter) to protect USB-C PD controllers. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after bulk capacitor, absorbing residual switching spikes and ESD events. Use Value: 29.2 V clamping voltage provides ≥10 V margin above 19 V nominal, meeting IEC 61000-4-2 Level 4 (15 kV air) requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18AHE3/52T | Lower PPPM (600 W), smaller SMB package (DO-214AA), same VWM/VBR range | Reduced surge handling; suited for space-constrained consumer PCBs where 1500 W is excessive | Select when board area is limited and peak surge energy is <50 mJ |
| SMCJ18A-E3/57T | Same electrical specs but commercial-grade (non-AEC-Q101), E3 suffix instead of HE3 | Lacks automotive qualification; not recommended for under-hood or safety-critical systems | Choose for cost-sensitive industrial or computing applications where AEC-Q101 is not mandated |
Compared with SMBJ18AHE3/52T and SMCJ18A-E3/57T, the SMCJ18HE3/57T uniquely delivers AEC-Q101 qualification, 1500 W surge capacity, and DO-214AB thermal performance - making it the only option among the three qualified for automotive power rail protection requiring sustained 150 °C operation.
Availability
SMCJ18HE3/57T is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom line cards, and consumer power adapters requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ18HE3/57T 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade validation.
The SMCJ series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where failure modes must be mitigated to ISO 16750 or IEC 61000-4-x levels.
FAQ
What is the clamping voltage of the SMCJ18HE3/57T under a 10/1000 µs surge?
The SMCJ18HE3/57T clamps to a maximum of 29.2 V at its rated peak pulse current (IPPM) of 51.4 A, measured using the standardized 10/1000 µs double-exponential waveform. This value is guaranteed across temperature and production lot, ensuring consistent protection margin for downstream 3.3 V or 5 V logic circuits interfacing with 12–18 V rails.
Is the SMCJ18HE3/57T suitable for automotive applications?
Yes - the SMCJ18HE3/57T carries full AEC-Q101 qualification, verified across temperature cycling, humidity bias, mechanical shock, and high-temperature reverse bias stress tests. Its 150 °C maximum junction temperature and HE3 whisker-resistant plating make it appropriate for under-hood ECUs, body control modules, and ADAS power supplies where reliability is mission-critical.
How does the SMCJ18HE3/57T differ from the SMCJ18A-E3/57T?
The SMCJ18HE3/57T differs from the SMCJ18A-E3/57T solely in qualification grade: HE3 denotes AEC-Q101 compliance and JESD201 Class 2 whisker resistance, whereas E3 indicates commercial-grade qualification only. All electrical parameters - VWM, VBR, VC, PPPM, and IFSM - are identical between the two parts.
What is the thermal resistance of the SMCJ18HE3/57T in standard mounting conditions?
When mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per Vishay's recommended layout, the SMCJ18HE3/57T exhibits a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead resistance (RθJL) of 15 °C/W. These values enable safe operation at 6.5 W steady-state dissipation up to +50 °C ambient.
Does the SMCJ18HE3/57T have polarity marking, and how is it oriented on the PCB?
Yes - the SMCJ18HE3/57T is unidirectional and features a molded cathode band on the package body. During PCB layout, the banded end must connect to the protected line (e.g., 12 V rail), while the anode connects to ground or low-impedance return. Reversing polarity prevents clamping and risks catastrophic failure during overvoltage events.
SMCJ18HE3/57T 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:
- 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)
SMCJ18HE3/57T FAQ
1.How can I place an order for SMCJ18HE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ18HE3/57T 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 SMCJ18HE3/57T reliable?
The price and inventory of SMCJ18HE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ18HE3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ18HE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ18HE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ18HE3/57T?
SMCJ18HE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ18HE3/57T 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 SMCJ18HE3/57T?
For technical support, including SMCJ18HE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ18HE3/57T requirements.
6.How does Aetrix verify that SMCJ18HE3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ18HE3/57T 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 SMCJ18HE3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ18HE3/57T?
All SMCJ18HE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ18HE3/57T, 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 SMCJ18HE3/57T part is unused and in its original packaging.
Return procedure for SMCJ18HE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ18HE3/57T Tags
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