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Vishay General Semiconductor - Diodes Division SMBG18CA-E3/52
- Part No.:
- SMBG18CA-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG18CA-E3/52.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:1,017
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Product details
Overview
SMBG18CA-E3/52 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMBG (DO-215AA) 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) at 1 mA, 600 W peak pulse power (10/1000 µs), clamping voltage of 29.2 V at 21.7 A, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SMBG18CA-E3/52 datasheet, SMBG18CA-E3/52 pinout, SMBG18CA-E3/52 application, or SMBG18CA-E3/52 equivalent, this device is selected for high-reliability transient suppression in automotive sensor interfaces, industrial I/O lines, and DC power rail protection where bidirectional surge immunity and low clamping ratio are critical.
Technical Context
The SMBG18CA-E3/52 operates as a bidirectional avalanche diode with symmetrical clamping in both polarities, enabling protection against positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive surge stress.
Designed for surface-mount automated assembly, it meets MSL Level 1 per J-STD-020 with 260 °C lead-free reflow compatibility and supports operation from −55 °C to +150 °C junction temperature. The device delivers 29.2 V clamping at 21.7 A peak pulse current (IPPM) while maintaining <1.0 µA reverse leakage at 18 V standoff.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin. |
| VBR (min/max) | 20.0 V / 22.1 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on during transients. |
| VC @ IPPM | 29.2 V at 21.7 A - Clamping voltage under 600 W 10/1000 µs surge; limits protected circuit voltage stress. |
| PPPM | 600 W - Peak pulse power handling capability; sustains standardized lightning/surge waveforms per IEC 61000-4-5. |
| IPPM | 21.7 A - Peak surge current supported at rated clamping voltage; determines minimum trace width and fuse coordination. |
| TJ max | +150 °C - Maximum junction temperature; enables deployment in under-hood automotive and high-ambient industrial environments. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan. |
Pinout & Package
Package: SMBG (DO-215AA), surface-mount gull-wing leaded case with matte tin-plated terminals, 0.235" × 0.255" footprint, 0.030" nominal lead thickness, and UL 94 V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | One terminal of symmetrical bidirectional structure; accepts reverse surge current during negative transients. |
| Cathode | Transient current entry (positive polarity) | Second terminal of symmetrical bidirectional structure; accepts forward surge current during positive transients. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns. |
| 600 W peak pulse power | Meets IEC 61000-4-5 Level 4 (4 kV) surge immunity requirements on 50 Ω source impedance. |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes voltage overshoot across protected ICs, reducing risk of latch-up or gate oxide damage. |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, body control, and ADAS modules requiring zero-defect reliability. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard Pb-free reflow without baking, simplifying SMT line integration. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive switching spikes in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS placed at connector interface to clamp ±200 V transients within 1 ns response time. Use Value: Prevents permanent damage to 3.3 V/5 V sensor signal conditioning ICs by limiting clamped voltage to ≤29.2 V during 10/1000 µs surges. | Use Scenario: Safeguarding digital input channels on programmable logic controllers exposed to relay coil flyback and motor drive noise in factory automation cabinets. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V DC input lines, mounted directly at terminal block entry point. Use Value: Maintains functional integrity of microcontroller GPIOs by suppressing 1 kV/0.5 J transients to sub-30 V levels without sacrificing signal bandwidth. |
| DC Power Rail Protection | Telecom Line Interface |
Use Scenario: Secondary surge protection on 12 V or 24 V board-level power distribution networks downstream of primary MOVs or gas discharge tubes. IC Role / Device Role / Timing Role: Fast-acting shunt device that activates after upstream coarse protection to limit residual voltage to safe levels. Use Value: Reduces risk of downstream DC-DC converter failure by clamping residual surges to ≤29.2 V with <1 ns response, preserving system uptime. | Use Scenario: Protecting Ethernet PHY front-end circuits and RS-485 transceivers from ESD and induced surges on outdoor telecom equipment interfaces. IC Role / Device Role / Timing Role: Bidirectional transient suppressor placed between transformer secondary and PHY IC, referenced to local ground. Use Value: Enables compliance with IEC 61000-4-2 (±8 kV contact) and IEC 61000-4-5 (2 kV line-to-ground) without adding series impedance or signal distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA | Same VWM (18 V), lower PPPM (600 W → 600 W), identical SMB package but DO-214AA outline; slightly higher VC (30.0 V vs. 29.2 V). | Not AEC-Q101 qualified; suitable for commercial/industrial but not automotive-tier designs. | Select SMBJ18CA only when AEC-Q101 is not required and PCB layout allows DO-214AA footprint. |
| SMCJ18CA | Same VWM and VBR, higher PPPM (1500 W), larger SMC (DO-214AB) package; clamps at 29.2 V but requires more board area. | Used where higher surge energy absorption is needed (e.g., main power entry), not for space-constrained board-level nodes. | Choose SMCJ18CA when system-level surge tests exceed 600 W or when thermal derating demands lower RθJA. |
Compared with SMBJ18CA and SMCJ18CA, SMBG18CA-E3/52 uniquely combines AEC-Q101 qualification, SMBG's compact DO-215AA footprint, and 29.2 V clamping in a 600 W rating-making it optimal for automotive and high-density industrial PCBs where reliability, size, and precise voltage limiting are jointly constrained.
Availability
SMBG18CA-E3/52 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and DC power rail protection requiring stable component supply and full traceability.
Supply support for SMBG18CA-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, rectifiers, MOSFETs, and protection devices with emphasis on high-reliability, automotive-qualified components.
The SMBG series was developed specifically for space-constrained, high-surge industrial and automotive applications requiring bidirectional TVS performance in a low-profile gull-wing package with AEC-Q101 validation.
FAQ
What is the clamping voltage of SMBG18CA-E3/52 at its rated peak pulse current?
The SMBG18CA-E3/52 has a maximum clamping voltage (VC) of 29.2 V at its specified peak pulse current (IPPM) of 21.7 A under a 10/1000 µs waveform. This value is measured per standard test conditions and ensures predictable voltage limiting during surge events. The SMBG18CA-E3/52 maintains this clamping performance across its full operating temperature range and is validated in production lot testing per Vishay specification 88456.
Is SMBG18CA-E3/52 suitable for automotive applications?
Yes, SMBG18CA-E3/52 is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood and body-control module environments. Its construction includes glass-passivated junctions, MSL Level 1 moisture sensitivity, and full thermal cycling validation. The SMBG18CA-E3/52 meets automotive ESD and surge immunity requirements when applied per recommended PCB layout and mounting guidelines in Vishay document 88456.
What does the "CA" suffix indicate in SMBG18CA-E3/52?
The "CA" suffix in SMBG18CA-E3/52 denotes a bidirectional transient voltage suppressor configuration, meaning the device provides symmetrical clamping for both positive and negative voltage transients. Unlike unidirectional variants (e.g., SMBG18A), the SMBG18CA-E3/52 has no polarity marking and functions identically in either orientation-ideal for AC-coupled or floating signal paths where transient polarity is unpredictable.
What is the standoff voltage (VWM) of SMBG18CA-E3/52, and how does it relate to system design?
The standoff voltage (VWM) of SMBG18CA-E3/52 is 18 V, representing the maximum continuous reverse voltage the device can withstand without entering breakdown. In system design, VWM must exceed the normal operating voltage of the protected line-e.g., 12 V or 24 V DC rails-with sufficient margin (typically ≥10 %) to avoid leakage or premature conduction. The SMBG18CA-E3/52's 18 V VWM makes it appropriate for 12 V automotive systems and 24 V industrial controls.
Does SMBG18CA-E3/52 require special PCB layout considerations?
Yes, SMBG18CA-E3/52 requires adherence to Vishay's recommended pad layout: 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to ensure rated 600 W pulse power dissipation and thermal performance. Short, direct traces to ground or return paths minimize inductance and preserve clamping speed. The SMBG18CA-E3/52's gull-wing leads also demand precise stencil aperture design for consistent solder paste deposition during reflow.
SMBG18CA-E3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-215AA, SMB Gull Wing
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 20.5A
- 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 (SMBG)
SMBG18CA-E3/52 FAQ
1.How can I place an order for SMBG18CA-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG18CA-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 SMBG18CA-E3/52 reliable?
The price and inventory of SMBG18CA-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 SMBG18CA-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBG18CA-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG18CA-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG18CA-E3/52?
SMBG18CA-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG18CA-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 SMBG18CA-E3/52?
For technical support, including SMBG18CA-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG18CA-E3/52 requirements.
6.How does Aetrix verify that SMBG18CA-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBG18CA-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 SMBG18CA-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBG18CA-E3/52?
All SMBG18CA-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBG18CA-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 SMBG18CA-E3/52 part is unused and in its original packaging.
Return procedure for SMBG18CA-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG18CA-E3/52 Tags
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