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Vishay General Semiconductor - Diodes Division SMF11A-M3-18
- Part No.:
- SMF11A-M3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF11A-M3-18.pdf
- Description:
- TVS DIODE 11VWM 18.2VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:8,813
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Product details
Overview
SMF11A-M3-18 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 11 V stand-off voltage (VRWM), 12.2–13.5 V reverse breakdown (VBR), 11 A peak pulse current (IPPM), 18.2 V maximum clamping voltage (VC) at IPPM, and 509 pF typical junction capacitance at 0 V - optimized for USB 2.0, HDMI, and industrial I/O port protection.
For engineers reviewing the SMF11A-M3-18 datasheet, SMF11A-M3-18 pinout, SMF11A-M3-18 application, or SMF11A-M3-18 equivalent, this device delivers verified ±30 kV IEC 61000-4-2 ESD immunity, AEC-Q101 qualification, and low-noise fast-response clamping for signal integrity-critical interfaces requiring robust electrostatic discharge protection without signal distortion.
Technical Context
The SMF11A-M3-18 operates as a single-channel unidirectional TVS diode with avalanche breakdown behavior, enabling precise voltage clamping during ESD transients. Its low incremental surge resistance ensures minimal voltage overshoot under 10/1000 μs surge conditions, while its SOD-123W-compatible DO-219AB package supports automated reflow assembly on dense PCB layouts.
Designed for bidirectional system-level ESD protection where polarity is fixed, it leverages "Low Noise" technology to achieve sub-nanosecond response time - critical for preserving signal rise/fall times in 480 Mbps USB 2.0 and 1.65 Gbps HDMI 1.4a applications. Thermal resistance (RthJA = 180 K/W) is specified for standard 3 mm × 3 mm Cu pads, supporting reliable power dissipation up to 200 W peak pulse power.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 11 V - defines maximum continuous operating voltage before clamping begins; sets safe margin above 9 V nominal interface rails. |
| Reverse Breakdown (VBR) | 12.2–13.5 V at 1 mA - tight tolerance ensures consistent turn-on across production lots for predictable protection threshold. |
| Clamping Voltage (VC) | 18.2 V max at 11 A IPPM - limits downstream IC stress during 10/1000 μs surges; enables compatibility with 20 V tolerant receivers. |
| Junction Capacitance (CD) | 509 pF at 0 V, 1 MHz - low enough for USB 2.0 eye diagram compliance; higher than SMF5V0A but acceptable for non-RF analog/sensor lines. |
| ESD Immunity | ±30 kV contact & air discharge per IEC 61000-4-2 - exceeds Level 4 industrial requirements, eliminating need for secondary protection stages. |
| Peak Pulse Power | 200 W at 10/1000 μs - sustains multiple ESD events without degradation; validated per IEC 61000-4-5 surge waveform standards. |
| Operating Temp Range | −65 °C to +175 °C - supports extended-temperature deployment in automotive engine control units and industrial motor drives. |
Pinout & Package
SMF11A-M3-18 uses the DO-219AB (SMF) package: low-profile (1.08 mm height), SOD-123W-compatible outline, molded UL 94 V-0 compound, MSL level 1, and wave/reflow solderable. Cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Input side of protected line | Connected to signal trace upstream of IC input; carries surge current into cathode during positive transients. |
| Cathode (Pin 2) | Clamping node / ground reference | Connected to system ground or low-impedance return path; establishes clamping voltage relative to ground during ESD events. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables single-device protection against repeated ESD strikes without derating or thermal runaway in compact layouts. |
| ±30 kV IEC 61000-4-2 ESD immunity | Meets highest industrial ESD test severity, reducing validation time and eliminating external spark gaps in end-equipment certification. |
| AEC-Q101 qualified | Validated for automotive under-hood and infotainment applications, including temperature cycling, mechanical shock, and humidity testing. |
| Low-noise fast-response technology | Sub-ns response preserves signal integrity on high-speed digital buses like USB 2.0 and RS-485, avoiding data corruption. |
| SOD-123W/SOD-123F compatible footprint | Allows drop-in replacement or shared PCB land pattern across Vishay's SMF family, simplifying BOM consolidation and layout reuse. |
Applications
| USB 2.0 Data Lines | HDMI DDC/CEC Channels |
|---|---|
Use Scenario: Protecting differential USB 2.0 D+ and D− lines from ESD events during cable hot-plug in portable docking stations. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between connector and USB transceiver IC, referenced to system ground. Use Value: 509 pF capacitance maintains <15% signal rise-time degradation at 480 Mbps; 18.2 V VC prevents damage to 3.3 V tolerant PHY inputs. | Use Scenario: Safeguarding HDMI DDC (I²C) and CEC control lines against ESD in home theater AV receivers exposed to user-handling. IC Role / Device Role / Timing Role: Standoff-clamp TVS on bidirectional I²C bus, with cathode tied to 3.3 V rail or ground depending on logic polarity. Use Value: 11 V VRWM avoids false triggering during 3.3 V logic swings; ±30 kV rating eliminates field returns due to display interface failures. |
| Industrial Sensor I/O Ports | Automotive Body Control Modules |
Use Scenario: Shielding 0–10 V analog sensor inputs on PLC analog input modules from ESD induced via field wiring. IC Role / Device Role / Timing Role: Single-line unidirectional TVS connected between sensor trace and ground, upstream of op-amp input stage. Use Value: 12.2–13.5 V VBR ensures clamping initiates only during overvoltage faults, not during normal 10 V full-scale operation. | Use Scenario: Protecting LIN bus transceiver pins in door module ECUs subjected to ESD during assembly and service. IC Role / Device Role / Timing Role: Clamping diode on LIN data line (single-wire bus), cathode grounded, anode tied to transceiver TX/RX pin. Use Value: AEC-Q101 qualification guarantees reliability over 15-year vehicle lifetime; −65 °C to +175 °C range covers under-dash thermal extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ11A-E3/5A | Higher clamping voltage (23.5 V), larger SMA package (4.5 mm × 2.7 mm), 600 pF capacitance | Less suitable for high-speed data lines; better for power-rail or lower-frequency analog protection | Select when board space allows larger footprint and signal bandwidth is below 10 MHz. |
| TPD2E001DRSR | Bi-directional dual-channel, 12 pF capacitance, 5 V VRWM, integrated ESD array in USON-6 | Optimized for USB Type-C CC lines and high-density portable designs; not unidirectional or 11 V rated | Choose for space-constrained dual-line protection where low capacitance and bi-directionality are mandatory. |
Compared with SMAJ11A-E3/5A and TPD2E001DRSR, SMF11A-M3-18 offers the optimal balance of 11 V standoff, 509 pF capacitance, and DO-219AB compactness for single-line high-speed interface protection - making it preferred for USB 2.0, HDMI auxiliary channels, and industrial analog I/O where precise voltage threshold and moderate bandwidth are key.
Availability
SMF11A-M3-18 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI DDC/CEC channel safeguarding, and industrial analog sensor I/O requiring stable component supply across automotive, industrial automation, and consumer electronics programs.
Supply support for SMF11A-M3-18 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 data line ESD protection with AEC-Q101 qualification, low capacitance, and compact DO-219AB packaging - engineered specifically for USB, HDMI, DisplayPort, and industrial I/O interfaces demanding robust transient immunity without signal degradation.
FAQ
What is the clamping voltage of SMF11A-M3-18 at its rated peak pulse current?
The SMF11A-M3-18 has a maximum clamping voltage (VC) of 18.2 V at its rated peak pulse current (IPPM) of 11 A under 10/1000 μs waveform conditions. This value is measured per IEC 61000-4-5 and ensures downstream ICs with 20 V absolute maximum ratings remain within safe operating limits during ESD events. The SMF11A-M3-18 achieves this with low incremental surge resistance and stable avalanche characteristics.
Is SMF11A-M3-18 suitable for bidirectional signal lines like I²C?
SMF11A-M3-18 is a unidirectional TVS diode and must be used with correct polarity: anode to signal, cathode to ground. For true bidirectional lines such as I²C, two SMF11A-M3-18 devices can be configured in back-to-back arrangement, or a dedicated bi-directional part like SMBJ11CA should be selected. The SMF11A-M3-18 datasheet explicitly specifies unidirectional operation, and its electrical characteristics (e.g., VRWM, VBR) are defined for single-polarity conduction.
Does SMF11A-M3-18 meet automotive qualification standards?
Yes, SMF11A-M3-18 is AEC-Q101 qualified, having passed stress tests including temperature cycling, mechanical shock, humidity, and ESD per human body model (>8 kV). This qualification confirms suitability for automotive applications such as body control modules, infotainment interfaces, and LIN bus protection - provided layout follows Vishay's recommended footprint and grounding guidelines outlined in the SMF5V0A–SMF58A datasheet.
What is the junction capacitance of SMF11A-M3-18 and how does it affect signal integrity?
The SMF11A-M3-18 exhibits 509 pF typical junction capacitance at 0 V and 1 MHz. While higher than ultra-low-capacitance TVS devices (<10 pF), this value is acceptable for USB 2.0 (480 Mbps) and HDMI DDC/CEC (100 kHz–400 kHz) signals, where rise-time impact remains within specification limits. The SMF11A-M3-18 balances clamping performance and capacitance for cost-sensitive industrial and consumer interfaces where RF-grade suppression is unnecessary.
Can SMF11A-M3-18 replace SMF10A or SMF12A in existing designs?
SMF11A-M3-18 can replace SMF10A (10 V VRWM) or SMF12A (12 V VRWM) only if the circuit's operating voltage and clamping margin align: its 11 V VRWM provides tighter standoff than SMF12A but higher than SMF10A. The SMF11A-M3-18 shares identical DO-219AB package, pinout, and thermal characteristics, enabling direct PCB substitution where 11 V threshold improves noise immunity without violating receiver input limits.
SMF11A-M3-18 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):
- 11V
- Voltage - Breakdown (Min):
- 12.2V
- Voltage - Clamping (Max) @ Ipp:
- 18.2V
- Current - Peak Pulse (10/1000µs):
- 11A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 509pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF11A-M3-18 FAQ
1.How can I place an order for SMF11A-M3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF11A-M3-18 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 SMF11A-M3-18 reliable?
The price and inventory of SMF11A-M3-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF11A-M3-18 is usually 5 days.
3.What payment methods are accepted for SMF11A-M3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF11A-M3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF11A-M3-18?
SMF11A-M3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF11A-M3-18 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 SMF11A-M3-18?
For technical support, including SMF11A-M3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF11A-M3-18 requirements.
6.How does Aetrix verify that SMF11A-M3-18 is sourced from the original manufacturer or authorized distributors?
All SMF11A-M3-18 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 SMF11A-M3-18 meets industry standards.
7.What is the process for return or replacement of SMF11A-M3-18?
All SMF11A-M3-18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF11A-M3-18, 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 SMF11A-M3-18 part is unused and in its original packaging.
Return procedure for SMF11A-M3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF11A-M3-18 Tags
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