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Vishay General Semiconductor - Diodes Division SMBG18A-E3/5B
- Part No.:
- SMBG18A-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG18A-E3/5B.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,604
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Product details
Overview
SMBG18A-E3/5B from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMBG (DO-215AA) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 18 V stand-off 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 20.5 A, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SMBG18A-E3/5B datasheet, SMBG18A-E3/5B pinout, SMBG18A-E3/5B application, or SMBG18A-E3/5B equivalent, key selection criteria include clamping performance under 10/1000 µs surge, unidirectional polarity with cathode band marking, thermal resistance (RθJA = 100 °C/W), junction temperature range (−55 to +150 °C), and compliance with UL 497B and JESD201 Class 2 whisker testing.
Technical Context
The SMBG18A-E3/5B operates as a clamping-type TVS diode, leveraging an avalanche breakdown mechanism to limit transient voltages above its VBR threshold. Its glass-passivated silicon junction ensures stable leakage (<1.0 µA at VWM) and fast response time (<1 ns), critical for protecting sensitive downstream components like microcontrollers and MOSFET gate drivers.
It is rated for 600 W peak pulse power with 0.01% duty cycle, supports 100 A non-repetitive forward surge current (8.3 ms half-sine), and maintains operation across −55 °C to +150 °C junction temperature - validated per AEC-Q101 stress tests including HTGB, HTRB, and TCT.
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 1 mA - defines reliable avalanche initiation window for predictable clamping onset |
| VC @ IPPM | 29.2 V at 20.5 A - peak clamped voltage during 10/1000 µs surge, limiting stress on protected ICs |
| PPPM | 600 W - surge energy handling capacity under standardized waveform, enabling protection against IEC 61000-4-5 Level 4 transients |
| IFSM | 100 A - withstands high-energy inductive turn-off surges without failure (8.3 ms half-sine) |
| TJ max | +150 °C - supports under-hood automotive environments and high-power industrial PCB layouts |
| Package | SMBG (DO-215AA) - surface-mount, low-profile footprint (6.48 mm × 3.94 mm) optimized for automated assembly |
Pinout & Package
Package: SMBG (DO-215AA), molded case with matte tin-plated leads, UL 94 V-0 flammability rating, and polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts surge current to ground when VLINE exceeds VBR |
| Anode | Reference/return path | Typically tied to system ground or low-impedance return plane; completes clamping path during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces |
| 600 W peak pulse power (10/1000 µs) | Meets IEC 61000-4-5 surge immunity requirements for industrial and automotive equipment |
| Glass passivated junction | Ensures long-term stability of VBR and low leakage (<1.0 µA) across temperature and life cycle |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns |
| UL 497B recognized (QVGQ2) | Approved for use in telecom and industrial signal-line protectors requiring safety certification |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Clamping diode placed between power rail and ground to shunt >100 V spikes within nanoseconds. Use Value: Limits voltage seen by MCU and CAN transceivers to ≤29.2 V, preventing latch-up or permanent damage. | Use Scenario: Safeguarding analog outputs of pressure/temperature sensors in PLC modules exposed to ESD and inductive switching noise. IC Role / Device Role / Timing Role: Unidirectional TVS on 4–20 mA loop or 0–10 V output line, referenced to system ground. Use Value: Maintains signal integrity by clamping transients before they distort sensor readings or damage ADC inputs. |
| Consumer Power Adapter Input Stage | Telecom Line Card Surge Protection |
Use Scenario: Secondary-side DC bus protection in USB-C PD adapters subject to hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Standoff-rated TVS on +5 V/+9 V/+15 V output rails, absorbing repetitive 10/1000 µs surges. Use Value: Enables compliance with IEC 62368-1 surge requirements while preserving adapter efficiency and thermal margin. | Use Scenario: Front-end protection of Ethernet PHY or RS-485 transceivers in base station remote units. IC Role / Device Role / Timing Role: Unidirectional clamp on VCC or data line, coordinated with series impedance for impedance matching. Use Value: Prevents latch-up in transceivers during lightning-induced surges on outdoor cabling, reducing field failure rates. |
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-E3/5B | Same VWM (18 V), identical SMB package, but lower PPPM = 600 W (same rating) and higher VC = 29.2 V (identical); differs only in JEDEC prefix (SMBJ vs SMBG) and minor thermal resistance (RθJA = 110 °C/W vs 100 °C/W) | Functionally interchangeable in most board-level designs; slight derating needed at elevated ambient temperatures | Select SMBG18A-E3/5B when tighter thermal performance or AEC-Q101 validation is required |
| 1.5SMC18A | Same VWM/VBR specs, but larger SMC (DO-214AB) package (7.11 mm × 6.22 mm), higher RθJA (~75 °C/W), and same 600 W rating | Requires PCB layout change; preferred where higher mechanical robustness or legacy footprint compatibility is prioritized | Choose SMBG18A-E3/5B for space-constrained automotive or portable designs needing low-profile mounting |
Compared with SMBJ18A-E3/5B and 1.5SMC18A, the SMBG18A-E3/5B offers superior thermal resistance (100 °C/W), AEC-Q101 qualification out-of-box, and DO-215AA footprint - making it optimal for next-generation automotive modules and high-density industrial controllers where board area and qualification rigor are critical.
Availability
SMBG18A-E3/5B is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and consumer power adapter input-stage surge suppression requiring stable component supply and full traceability.
Supply support for SMBG18A-E3/5B 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, automotive qualification, and application-specific performance.
The SMBG series was developed specifically for high-reliability transient suppression in space-constrained automotive and industrial systems, combining AEC-Q101 validation, low-profile packaging, and precise clamping characteristics.
FAQ
What is the clamping voltage of the SMBG18A-E3/5B under a 10/1000 µs surge?
The SMBG18A-E3/5B has a maximum clamping voltage (VC) of 29.2 V at a peak pulse current (IPPM) of 20.5 A under the standardized 10/1000 µs waveform. This value is measured per Figure 1 in Vishay Document 88456 and ensures protected circuitry remains below critical voltage thresholds during surge events.
Is the SMBG18A-E3/5B suitable for automotive applications?
Yes, the SMBG18A-E3/5B is AEC-Q101 qualified and explicitly listed in Vishay's automotive-grade product offering. Its construction - including glass-passivated junction, MSL Level 1 rating, and operation up to +150 °C junction temperature - meets stringent requirements for engine control, body electronics, and ADAS subsystems.
What does the "E3/5B" suffix indicate in SMBG18A-E3/5B?
The "E3" denotes RoHS-compliant, industrial-grade termination with matte tin plating; "5B" specifies packaging in 13-inch diameter plastic tape and reel with a base quantity of 3200 units. This format supports high-volume SMT assembly and aligns with Vishay's standard ordering nomenclature per Document 88456.
How does the SMBG18A-E3/5B differ from bidirectional variants like SMBG18CA?
The SMBG18A-E3/5B is unidirectional with a cathode band marking and conducts only in reverse bias during clamping; SMBG18CA is bidirectional, symmetrical in both directions, and lacks polarity marking. Their VWM, VBR, and VC values differ accordingly - SMBG18CA has VWM = 18 V but VBR = 20.0–22.1 V in either direction, whereas SMBG18A-E3/5B clamps only when cathode is positive relative to anode.
What is the thermal resistance of the SMBG18A-E3/5B, and how does it affect layout design?
The SMBG18A-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe junction temperature under repeated surges, PCB layout must provide adequate copper area and avoid thermal bottlenecks - especially critical in automotive under-hood deployments where ambient temperatures exceed 85 °C.
SMBG18A-E3/5B 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMBG18A-E3/5B FAQ
1.How can I place an order for SMBG18A-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG18A-E3/5B 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 SMBG18A-E3/5B reliable?
The price and inventory of SMBG18A-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG18A-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBG18A-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG18A-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG18A-E3/5B?
SMBG18A-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG18A-E3/5B 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 SMBG18A-E3/5B?
For technical support, including SMBG18A-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG18A-E3/5B requirements.
6.How does Aetrix verify that SMBG18A-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBG18A-E3/5B 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 SMBG18A-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBG18A-E3/5B?
All SMBG18A-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBG18A-E3/5B, 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 SMBG18A-E3/5B part is unused and in its original packaging.
Return procedure for SMBG18A-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG18A-E3/5B Tags
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