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Vishay General Semiconductor - Diodes Division SMBJ18C-E3/52
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- Part No.:
- SMBJ18C-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18C-E3/52.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,187
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Product details
Overview
SMBJ18C-E3/52 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) 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, 29.2 V maximum clamping voltage (VC) at 20.5 A peak pulse current (IPPM), and 600 W peak pulse power rating with 10/1000 µs waveform - deployed on power rails and signal lines in industrial sensor interfaces and automotive ECUs.
For engineers reviewing the SMBJ18C-E3/52 datasheet, SMBJ18C-E3/52 pinout, SMBJ18C-E3/52 application, or SMBJ18C-E3/52 equivalent, this page delivers verified electrical parameters, thermal derating behavior, clamping performance under surge conditions, and RoHS-compliant commercial-grade sourcing details - all specific to the SMBJ18C-E3/52 variant.
Technical Context
The SMBJ18C-E3/52 operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold (VBR = 20.0–22.1 V), thereby shunting transient energy to ground. Its low incremental surge resistance and fast response time (<1 ns) enable effective suppression of ESD, lightning-induced surges, and inductive switching spikes.
Thermal design relies on junction-to-ambient thermal resistance (RθJA = 100 °C/W) and junction-to-lead resistance (RθJL = 20 °C/W), with derating required above TA = 25 °C per Figure 2. The device is rated for TJ = –55 to +150 °C and meets MSL Level 1 per J-STD-020 at 260 °C peak reflow temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 18 V - Maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 20.0–22.1 V at IT = 1 mA - Confirmed avalanche onset range; ensures reliable triggering without premature conduction |
| VC (Clamping Voltage) | 29.2 V at IPPM = 20.5 A - Peak voltage seen by protected circuit during 10/1000 µs surge; determines safe IC stress level |
| PPPM (Peak Pulse Power) | 600 W - Sustained surge energy handling capability under standardized 10/1000 µs waveform |
| ID (Reverse Leakage) | 1.0 µA max at VWM - Minimal standby power loss and signal integrity impact in high-impedance circuits |
| TJ max. | +150 °C - Enables operation in under-hood automotive and industrial environments with elevated ambient temperatures |
| Package | SMB (DO-214AA) - Surface-mount footprint compatible with automated assembly; 0.205" × 0.130" body size with matte tin-plated leads |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, unidirectional polarity marked with cathode band. Dimensions: 5.21 mm × 3.30 mm × 2.20 mm (L × W × H). Meets UL 94 V-0 flammability rating and J-STD-002/JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal (cathode-banded end is opposite) | Connected to protected line (e.g., VCC or signal); conducts surge current toward ground when reverse-biased beyond VBR |
| Cathode | Reverse-biased terminal (marked with band) | Connected to system ground; establishes reference for clamping action and defines unidirectional conduction path |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge immunity without external series impedance |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes voltage overshoot across protected ICs, reducing risk of latch-up or gate oxide damage |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without baking; compatible with high-volume manufacturing flow |
| RoHS-compliant, commercial grade (E3 suffix) | Meets global environmental compliance requirements; no halogen restrictions applied |
| 150 °C maximum junction temperature | Validates use in engine control modules, motor drives, and other thermally demanding industrial locations |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 24 V CAN transceiver signal lines against load dump and ESD events in factory automation systems. IC Role / Device Role / Timing Role: Unidirectional TVS placed between CAN_H/CAN_L and chassis ground to clamp transients while preserving signal integrity. Use Value: Limits voltage excursion to ≤29.2 V during 20.5 A surge, preventing damage to ISO 11898-compliant PHY ICs rated for 40 V absolute maximum. |
Use Scenario: Safeguarding microcontroller I/O pins connected to door lock actuators subject to inductive kickback. IC Role / Device Role / Timing Role: Standoff protection on 12 V supply rail feeding solenoid drivers; triggered only during >20 V transients. Use Value: Withstands 100 A non-repetitive forward surge (IFSM), ensuring reliability across repeated actuator cycling without degradation. |
| Power Supply Input Stage | Telecom Line Card Protection |
Use Scenario: Secondary-side overvoltage clamp on 18 V DC-DC converter output feeding FPGA core logic. IC Role / Device Role / Timing Role: Fast-acting shunt device absorbing residual transients escaping primary-side filtering. Use Value: Clamps within <1 ns to 29.2 V, maintaining FPGA VCC within 10 % tolerance during 600 W surge events. |
Use Scenario: Protection of Ethernet PHY interface on PoE-powered network switch line cards. IC Role / Device Role / Timing Role: Unidirectional suppressor on 48 V bias rail, coordinated with upstream MOV and gas discharge tube. Use Value: Low leakage (1.0 µA) avoids loading 48 V standby circuits; SMB package enables dense layout adjacent to RJ45 magnetics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A-E3/52 | VBR min/max = 20.0–22.1 V (identical), but rated for 1.0 µA ID at VWM vs. SMBJ18C-E3/52's 1.0 µA - same spec; identical electrical envelope | No functional difference; both unidirectional, same SMB package and surge ratings | Select SMBJ18A-E3/52 if legacy BOM alignment or distributor stock preference applies; electrically interchangeable |
| SMAJ18A-E3/52 | Lower PPPM = 400 W (vs. 600 W), higher VC = 32.4 V at lower IPPM = 12.4 A; SMA package (smaller, RθJA = 140 °C/W) | Less robust for high-energy surges; suitable only where space constraints outweigh power-handling needs | Choose SMAJ18A-E3/52 only when PCB area is critical and surge threat level is limited to IEC 61000-4-2 ±8 kV contact discharge |
Compared with SMBJ18A-E3/52, the SMBJ18C-E3/52 offers identical clamping and breakdown specs but differs in marking code - not a functional distinction. Against SMAJ18A-E3/52, it delivers 50 % higher surge power handling and lower clamping voltage, making it preferable for industrial and automotive applications with stringent IEC 61000-4-5 compliance requirements.
Availability
SMBJ18C-E3/52 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, and telecom line card protection requiring stable component supply, RoHS-compliant commercial-grade sourcing, and full traceability.
Supply support for SMBJ18C-E3/52 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 application-specific performance.
The SMBJ series targets board-level transient protection in harsh environments, delivering high-power surge suppression in compact surface-mount packages for automotive, industrial, and communications infrastructure.
FAQ
What is the breakdown voltage range for SMBJ18C-E3/52?
The SMBJ18C-E3/52 has a guaranteed breakdown voltage (VBR) range of 20.0 V to 22.1 V at test current IT = 1 mA, measured per ANSI/IEEE C62.35. This range ensures consistent turn-on behavior across production lots and validates its suitability for 18 V nominal systems where margin above VWM is critical to avoid false triggering.
Is SMBJ18C-E3/52 RoHS-compliant and lead-free?
Yes, SMBJ18C-E3/52 is RoHS-compliant and lead-free, indicated by the "E3" suffix per Vishay's ordering nomenclature. It uses matte tin-plated leads and conforms to J-STD-002 and JESD 22-B102 solderability standards, with no exemptions required for lead content.
What is the maximum clamping voltage of SMBJ18C-E3/52 under surge conditions?
The SMBJ18C-E3/52 exhibits a maximum clamping voltage (VC) of 29.2 V at peak pulse current (IPPM) = 20.5 A, tested with a 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during worst-case transient events and is confirmed in the Electrical Characteristics table on page 2 of document 88392.
Can SMBJ18C-E3/52 be used in automotive applications?
SMBJ18C-E3/52 is qualified for commercial-grade use; for automotive applications, Vishay offers AEC-Q101-qualified variants such as SMBJ18AHE3_B/H. While SMBJ18C-E3/52 shares identical electrical specs, it lacks formal automotive qualification - use only in non-safety-critical, non-under-hood locations unless validated per customer qualification protocols.
What is the thermal resistance of SMBJ18C-E3/52?
The SMBJ18C-E3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-lead resistance (RθJL) of 20 °C/W, measured on 0.2" × 0.2" copper pads. These values inform thermal derating above TA = 25 °C and confirm suitability for reflow profiles up to 260 °C peak temperature (MSL Level 1).
SMBJ18C-E3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- 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):
- 18.6A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ18C-E3/52 FAQ
1.How can I place an order for SMBJ18C-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18C-E3/52 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 SMBJ18C-E3/52 reliable?
The price and inventory of SMBJ18C-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ18C-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ18C-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18C-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18C-E3/52?
SMBJ18C-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18C-E3/52 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 SMBJ18C-E3/52?
For technical support, including SMBJ18C-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18C-E3/52 requirements.
6.How does Aetrix verify that SMBJ18C-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ18C-E3/52 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 SMBJ18C-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ18C-E3/52?
All SMBJ18C-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18C-E3/52, 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 SMBJ18C-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ18C-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18C-E3/52 Tags
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