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Vishay General Semiconductor - Diodes Division SMF18A-E3-08
- Part No.:
- SMF18A-E3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF18A-E3-08.pdf
- Description:
- TVS DIODE 18VWM 29.2VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:30,927
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Product details
Overview
SMF18A-E3-08 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for low-capacitance transient voltage suppression in high-speed data lines. It features a 18 V stand-off voltage (VRWM), 29.2 V maximum clamping voltage at 6.8 A peak pulse current, 320 pF typical capacitance at 0 V, ±30 kV IEC 61000-4-2 ESD immunity, and AEC-Q101 qualification for automotive applications.
For engineers reviewing the SMF18A-E3-08 datasheet, SMF18A-E3-08 pinout, SMF18A-E3-08 application, or SMF18A-E3-08 equivalent, this device is selected for robust electrostatic discharge protection in USB 2.0, HDMI, automotive infotainment interfaces, and industrial sensor signal lines where low clamping voltage and sub-1 ns response time are critical to preserve signal integrity under surge events.
Technical Context
The SMF18A-E3-08 operates as a unidirectional TVS diode with avalanche breakdown behavior, optimized for fast transient suppression using silicon planar technology. Its junction structure delivers low incremental surge resistance and stable clamping performance across temperature extremes from –65 °C to +175 °C.
It is rated for 200 W peak pulse power (10/1000 μs waveform) and 1000 W (8/20 μs), with thermal resistance of 180 K/W when mounted on standard epoxy-glass PCB pads. The device meets IEC 61000-4-2 (±30 kV contact/air) and AEC-Q101 Class H3B (>8 kV HBM) requirements without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 18 V - Maximum continuous reverse operating voltage before leakage exceeds 0.1 μA; defines safe operating margin below clamping threshold. |
| Clamping Voltage (VC) | 29.2 V at IPPM = 6.8 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge; ensures downstream ICs remain within absolute max ratings. |
| Peak Pulse Power | 200 W (10/1000 μs) - Sustains transient energy without failure; sufficient for IEC 61000-4-5 Level 3 surges in industrial environments. |
| Capacitance (CD) | 320 pF at VR = 0 V, f = 1 MHz - Low enough for USB 2.0 (480 Mbps) and CAN FD signal integrity; avoids excessive signal attenuation or rise-time degradation. |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - Exceeds automotive and industrial ESD immunity requirements; eliminates need for secondary protection stages. |
| Operating Temp Range | –65 °C to +175 °C - Enables deployment in under-hood automotive modules, motor drives, and outdoor industrial enclosures without thermal derating. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including HTGB, TCT, and HTRB testing; supports PPAP documentation for Tier 1 suppliers. |
Pinout & Package
SMF18A-E3-08 uses the DO-219AB (SOD-123W-compatible) low-profile surface-mount package: 3.9 mm × 1.9 mm × 1.08 mm, molded in UL 94 V-0 compound, MSL level 1, reflow-solderable up to 260 °C peak.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (1) | Input side of protection path | Connected to signal line being protected; conducts surge current toward cathode during overvoltage event. |
| Cathode (2) | Clamp reference node | Connected to ground or common return; establishes clamping voltage relative to system reference; marked with bar on top surface. |
Key Features
| Feature | Design Value |
|---|---|
| "Low Noise" fast-response architecture | Sub-nanosecond response time enables clamping before sensitive transceivers experience latch-up or damage. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ESD), improving protection margin for 3.3 V and 5 V logic. |
| Wave and reflow solder compatible | Supports automated assembly without lead damage or delamination; qualified per J-STD-020 MSL level 1. |
| Unidirectional configuration | Optimized for DC-biased lines (e.g., automotive LIN, CAN, sensor outputs); blocks reverse leakage while clamping positive surges. |
| RoHS-compliant, lead-free terminations | Tin-plated terminals ensure compatibility with Pb-free soldering processes and meet global environmental compliance mandates. |
Applications
| Automotive Infotainment Interface | Industrial Sensor Signal Line |
|---|---|
Use Scenario: Protecting HDMI and USB 2.0 ports in head units and display modules against ESD during assembly, service, and end-user interaction. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed directly at connector entry point to shunt ESD energy before reaching SerDes PHY or controller IC. Use Value: 320 pF capacitance preserves 480 Mbps USB 2.0 eye diagram integrity; ±30 kV ESD rating eliminates field failures in vehicle warranty claims. | Use Scenario: Safeguarding analog output (4–20 mA) and digital I²C lines from ESD and load dump-induced transients in factory-floor pressure/temperature sensors. IC Role / Device Role / Timing Role: Standoff-clamp TVS placed between sensor IC output and connector; clamps to 29.2 V to prevent op-amp saturation or ADC input damage. Use Value: 18 V VRWM aligns with 24 V industrial supply rails; 175 °C max junction temperature supports operation near motors and drives. |
| Automotive Body Control Module (BCM) | Medical Diagnostic Equipment Port |
Use Scenario: Protecting LIN bus transceivers and LED driver control inputs in door modules and lighting ECUs exposed to human touch and harness coupling. IC Role / Device Role / Timing Role: Unidirectional ESD suppressor on LIN signal line (dominant/recessive logic levels referenced to battery ground). Use Value: AEC-Q101 qualification ensures long-term reliability in 15-year automotive lifecycle; low leakage (<0.1 μA) prevents false wake-up in sleep mode. | Use Scenario: Shielding USB and RS-232 ports on ultrasound and patient monitor front panels from clinical ESD events (e.g., gloves, carts, flooring). IC Role / Device Role / Timing Role: Primary ESD clamp at port entry, coordinated with system-level filtering to meet IEC 60601-1-2 immunity requirements. Use Value: 29.2 V clamping voltage protects 3.3 V microcontroller I/O pins; RoHS/lead-free compliance satisfies medical regulatory submissions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A-E3/57T | Higher clamping voltage (32.4 V at 6.2 A), larger SMA (DO-214AC) package (4.5 mm × 2.7 mm), 400 pF capacitance. | Better suited for higher-energy surges but less ideal for high-speed data due to higher CD and slower response. | Select SMAJ18A-E3/57T only if board space allows larger footprint and signal bandwidth < 100 Mbps. |
| TPD2E001DRSR | Bi-directional dual-channel array (2×), 15 pF typical capacitance, 12 V VRWM, not AEC-Q101 qualified. | Designed for ultra-high-speed interfaces (USB 3.0, HDMI 2.0); lacks automotive qualification and single-line surge handling capability. | Choose TPD2E001DRSR for multi-line, low-capacitance consumer electronics; avoid for automotive or high-peak-current industrial use. |
Compared with SMAJ18A-E3/57T and TPD2E001DRSR, SMF18A-E3-08 uniquely balances automotive qualification, compact DO-219AB size, 320 pF capacitance for USB 2.0, and 29.2 V clamping-making it optimal for space-constrained, safety-critical, medium-speed interface protection.
Availability
SMF18A-E3-08 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor nodes, body control modules, and medical diagnostic equipment requiring stable component supply and long-lifecycle support.
Supply support for SMF18A-E3-08 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 Semiconductors is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SMF series targets high-speed interface protection with AEC-Q101 qualification, low capacitance, and tight clamping-designed specifically for next-generation automotive electronics and ruggedized industrial connectivity.
FAQ
What is the maximum clamping voltage of the SMF18A-E3-08 under standard test conditions?
The SMF18A-E3-08 has a maximum clamping voltage (VC) of 29.2 V when subjected to a 10/1000 μs peak pulse current of 6.8 A. This value is measured per IEC 61000-4-5 and ensures protected circuits remain within safe voltage limits during surge events. The SMF18A-E3-08 maintains this clamping performance across its full operating temperature range of –65 °C to +175 °C.
Is the SMF18A-E3-08 qualified for automotive applications?
Yes, the SMF18A-E3-08 is AEC-Q101 qualified and rated for human body model (HBM) ESD > 8 kV (Class H3B). It undergoes stress testing including high-temperature reverse bias (HTRB), temperature cycling (TCT), and high-temperature gate bias (HTGB) to ensure reliability in automotive environments. The SMF18A-E3-08 is widely used in BCMs, infotainment systems, and ADAS sensor interfaces.
What is the capacitance of the SMF18A-E3-08 and how does it affect high-speed signal lines?
The SMF18A-E3-08 exhibits 320 pF typical capacitance at 0 V reverse bias and 1 MHz frequency. This value is low enough to avoid significant signal distortion on USB 2.0 (480 Mbps) and CAN FD (2 Mbps) lines while providing effective ESD suppression. Higher capacitance would degrade edge rates and increase bit error rates; the SMF18A-E3-08's 320 pF strikes an optimal balance for medium-speed interfaces.
Does the SMF18A-E3-08 have polarity markings, and how is it oriented on the PCB?
Yes, the SMF18A-E3-08 features a cathode bar marking on its top surface, aligned with Pin 2. During PCB layout, the cathode must be connected to ground or the lowest-potential reference node, while the anode connects to the signal line being protected. The DO-219AB package orientation follows standard SOD-123W tape direction: cathode toward sprocket holes per Vishay's carrier tape specification (Document S8-V-3717.02-003).
What is the peak pulse power rating of the SMF18A-E3-08 and under which waveform is it specified?
The SMF18A-E3-08 is rated for 200 W peak pulse power under the 10/1000 μs double-exponential waveform per IEC 61000-4-5, and 1000 W under the 8/20 μs waveform. These ratings reflect non-repetitive surge capability; the device sustains these levels without parametric shift or catastrophic failure when mounted on standard 3 mm × 3 mm Cu pads. The SMF18A-E3-08's 200 W rating covers most IEC 61000-4-4 and -4-5 Level 3–4 industrial transients.
SMF18A-E3-08 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-219AB
- Series:
- eSMP®
- 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):
- 6.8A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 320pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF18A-E3-08 FAQ
1.How can I place an order for SMF18A-E3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF18A-E3-08 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 SMF18A-E3-08 reliable?
The price and inventory of SMF18A-E3-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF18A-E3-08 is usually 5 days.
3.What payment methods are accepted for SMF18A-E3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF18A-E3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF18A-E3-08?
SMF18A-E3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF18A-E3-08 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 SMF18A-E3-08?
For technical support, including SMF18A-E3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF18A-E3-08 requirements.
6.How does Aetrix verify that SMF18A-E3-08 is sourced from the original manufacturer or authorized distributors?
All SMF18A-E3-08 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 SMF18A-E3-08 meets industry standards.
7.What is the process for return or replacement of SMF18A-E3-08?
All SMF18A-E3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF18A-E3-08, 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 SMF18A-E3-08 part is unused and in its original packaging.
Return procedure for SMF18A-E3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF18A-E3-08 Tags
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