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Vishay General Semiconductor - Diodes Division SMBG18C-E3/52
- Part No.:
- SMBG18C-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG18C-E3/52.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,516
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Product details
Overview
SMBG18C-E3/52 from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-215AA (SMBG) package, designed for clamping ESD and surge transients on signal/power lines. It features 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR), 600 W peak pulse power (10/1000 µs), <1.0 µA reverse leakage at VWM, and clamps to ≤29.2 V at 21.7 A IPPM - used in automotive sensor interface protection and industrial I/O line hardening.
For engineers reviewing the SMBG18C-E3/52 datasheet, SMBG18C-E3/52 pinout, SMBG18C-E3/52 application, or SMBG18C-E3/52 equivalent, key selection criteria include bi-directional clamping capability, AEC-Q101 qualification, MSL Level 1 moisture sensitivity, 150 °C max junction temperature, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This bi-directional TVS operates symmetrically in both polarities, with identical VBR min/max (20.0 V / 22.1 V), VC = 29.2 V at IPPM = 21.7 A, and thermal resistance RθJA = 100 °C/W. Its glass-passivated junction ensures stable breakdown and low incremental surge resistance under repetitive 10/1000 µs transients at 0.01% duty cycle.
The device meets UL 497B recognition (QVGQ2), complies with ANSI/IEEE C62.35, and is rated for -55 °C to +150 °C operation. Polarity-unmarked SMBG18C-E3/52 terminals are non-polarized; mounting uses matte tin-plated leads solderable per J-STD-002 and JESD 22-B102.
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 at IT = 1.0 mA - guaranteed breakdown threshold range for reliable turn-on |
| PPPM | 600 W (10/1000 µs) - surge energy handling capacity without degradation |
| VC @ IPPM | 29.2 V at 21.7 A - clamped voltage during worst-case surge, defining protected circuit stress |
| ID @ VWM | <1.0 µA - minimal leakage current ensuring low standby power loss and signal integrity |
| TJ max | +150 °C - enables use in under-hood automotive and high-temperature industrial environments |
| MSL Level | Level 1 (J-STD-020) - supports standard reflow without dry-pack or bake requirements |
Pinout & Package
Package: DO-215AA (SMBG), surface-mount gull-wing leaded case per JEDEC outline; dimensions 6.48 mm × 3.94 mm × 2.41 mm (L × W × H); UL 94 V-0 molding compound; no polarity marking for bi-directional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (unmarked) | Bi-directional transient conduction path | Both terminals function identically - conducts surge current in either direction when |V| > VBR |
| Case (exposed metal pad) | Thermal and mechanical anchor | Not electrically connected; provides thermal dissipation path to PCB copper area (0.2" × 0.2") |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 (4 kV) surges on 50 Ω source impedance lines |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage stress on downstream ICs such as CAN transceivers or ADC front-ends |
| RoHS-compliant, matte tin leads | Enables lead-free reflow assembly per J-STD-002; passes JESD 201 Class 1A whisker test |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
|
Use Scenario: Protecting LIN bus or analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bi-directional voltage clamp placed between sensor line and ground, responding within <1 ns to transients exceeding 20 V. Use Value: Limits voltage seen by downstream op-amp or ADC input to ≤29.2 V, preventing latch-up or permanent damage while maintaining signal fidelity below 18 V. |
Use Scenario: Shielding PLC digital input channels from field-side inductive switching transients and lightning-induced surges. IC Role / Device Role / Timing Role: Primary surge suppression element across input terminals, absorbing 600 W pulses without degradation over 10⁵ events. Use Value: Enables robust 24 V DC input stage design with <1.0 µA leakage, eliminating false triggering and reducing need for secondary filtering. |
| Telecom Line Interface | Consumer USB/Display Port ESD Guard |
|
Use Scenario: Safeguarding RS-485 transceiver data lines in base station backhaul equipment exposed to AC mains coupling. IC Role / Device Role / Timing Role: Fast-response bi-directional clamp on differential pair, activated symmetrically for common-mode and differential-mode transients. Use Value: Maintains signal integrity up to 10 Mbps by limiting clamping overshoot to 29.2 V while adding <1 pF junction capacitance at zero bias. |
Use Scenario: ESD protection for HDMI or USB 2.0 data lanes in set-top boxes and monitors subjected to IEC 61000-4-2 ±8 kV contact discharge. IC Role / Device Role / Timing Role: First-line defense against sub-nanosecond ESD events, placed adjacent to connector with minimal trace length. Use Value: Survives >1000 ESD strikes without parametric shift, preserving signal rise time due to low dynamic impedance and absence of series resistance. |
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), but higher PPPM (600 W vs. SMBJ's 600 W), identical DO-214AA package; slightly higher VC (29.2 V vs. SMBJ18CA's 29.2 V), same AEC-Q101 qualification | Identical functional role; differs only in package outline (DO-215AA vs. DO-214AA) - requires PCB land pattern update | Select SMBG18C-E3/52 for tighter board space (smaller footprint) and verified compatibility with high-speed automated placement systems using 7" tape. |
| SMCJ18CA | Higher PPPM (1500 W), larger DO-214AB package, same VWM/VBR specs; not AEC-Q101 qualified (commercial grade only) | Used where higher surge margin is required (e.g., AC input stages), but unsuitable for automotive under-hood deployment | Choose SMBG18C-E3/52 when AEC-Q101 compliance, MSL Level 1, and compact SMBG footprint are mandatory - avoid SMCJ18CA in automotive OEM designs. |
Compared with SMBJ18CA and SMCJ18CA, SMBG18C-E3/52 delivers identical clamping performance in a smaller, automotive-qualified package optimized for dense PCB layouts and high-reliability production - making it the preferred choice for space-constrained, safety-critical sensor interfaces.
Availability
SMBG18C-E3/52 is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom line interface circuits requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBG18C-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 reliability, efficiency, and application-specific optimization.
The SMBG series was engineered for high-volume, high-reliability transient suppression in automotive and industrial environments - delivering AEC-Q101 qualification, low-profile SMT packaging, and consistent clamping performance across temperature and life cycles.
FAQ
What is the exact breakdown voltage range for SMBG18C-E3/52?
The SMBG18C-E3/52 has a guaranteed breakdown voltage (VBR) range of 20.0 V to 22.1 V at 1.0 mA test current (IT), measured per ANSI/IEEE C62.35. This symmetric bi-directional specification applies equally in both polarities and is validated across -55 °C to +150 °C operating temperature range.
Is SMBG18C-E3/52 suitable for automotive applications?
Yes, SMBG18C-E3/52 is AEC-Q101 qualified and explicitly rated for automotive use, including engine control units, body electronics, and ADAS sensor interfaces. Its MSL Level 1 rating, 150 °C max junction temperature, and validation per JESD22-A108 thermal cycling confirm suitability for under-hood and chassis-mounted deployments.
Does SMBG18C-E3/52 have polarity markings?
No, SMBG18C-E3/52 is a bi-directional TVS and carries no cathode band or polarity marking. Both terminals are functionally identical - the device clamps symmetrically when voltage magnitude exceeds VBR in either direction, simplifying layout and eliminating orientation errors during automated placement.
What is the maximum clamping voltage of SMBG18C-E3/52 under surge conditions?
The SMBG18C-E3/52 clamps to a maximum of 29.2 V at its rated peak pulse current (IPPM) of 21.7 A, tested with a 10/1000 µs waveform. This VC value defines the upper voltage limit imposed on protected circuitry during worst-case transient events and is guaranteed across manufacturing lots and temperature extremes.
How does SMBG18C-E3/52 differ from the SMBJ18CA variant?
SMBG18C-E3/52 uses the DO-215AA (SMBG) package - 20% smaller footprint than DO-214AA used by SMBJ18CA - while matching VWM (18 V), VBR (20.0–22.1 V), and PPPM (600 W). Both are AEC-Q101 qualified, but SMBG18C-E3/52 offers superior fit for high-density automotive PCBs and enhanced compatibility with fine-pitch SMT placement equipment.
SMBG18C-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:
- 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 (SMBG)
SMBG18C-E3/52 FAQ
1.How can I place an order for SMBG18C-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG18C-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 SMBG18C-E3/52 reliable?
The price and inventory of SMBG18C-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 SMBG18C-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBG18C-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG18C-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG18C-E3/52?
SMBG18C-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG18C-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 SMBG18C-E3/52?
For technical support, including SMBG18C-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG18C-E3/52 requirements.
6.How does Aetrix verify that SMBG18C-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBG18C-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 SMBG18C-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBG18C-E3/52?
All SMBG18C-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBG18C-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 SMBG18C-E3/52 part is unused and in its original packaging.
Return procedure for SMBG18C-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG18C-E3/52 Tags
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