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Vishay General Semiconductor - Diodes Division SMF20A-M3-18
- Part No.:
- SMF20A-M3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF20A-M3-18.pdf
- Description:
- TVS DIODE 20VWM 32.4VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:4,452
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Product details
Overview
SMF20A-M3-18 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in DO-219AB (SOD-123W) package, designed for I/O line protection in high-speed digital interfaces. It features a 20 V stand-off voltage (VRWM), 22.2 V minimum breakdown voltage (VBR), 32.4 V maximum clamping voltage at 6.2 A peak pulse current, and 283 pF typical junction capacitance at 0 V - optimized for USB 2.0, HDMI, and industrial sensor interface protection.
For engineers reviewing the SMF20A-M3-18 datasheet, SMF20A-M3-18 pinout, SMF20A-M3-18 application, or SMF20A-M3-18 equivalent, this device delivers verified ±30 kV IEC 61000-4-2 ESD immunity, AEC-Q101 qualification, low 1.08 mm profile, and compatibility with automated reflow soldering - critical for automotive infotainment, industrial HMI, and portable medical data ports.
Technical Context
The SMF20A-M3-18 operates as a single-channel transient voltage suppression (TVS) diode with unidirectional polarity and cathode-anode configuration. Its silicon avalanche structure enables sub-nanosecond response to ESD transients, while its low incremental surge resistance ensures stable clamping under 10/1000 μs waveform stress up to 200 W peak pulse power.
Designed for placement directly at connector entry points, it supports bidirectional signal integrity preservation via low 283 pF capacitance and maintains <0.1 μA leakage at 20 V VRWM. Thermal resistance is rated at 180 K/W when mounted on 3 mm × 3 mm Cu pads, enabling reliable operation across -65 °C to +175 °C ambient range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 20 V - maximum continuous reverse operating voltage before leakage exceeds 0.1 μA; defines safe operating margin for 18–20 V nominal bus lines. |
| Breakdown Voltage (VBR) | 22.2–24.6 V at 1 mA - precise avalanche initiation threshold ensuring predictable turn-on during overvoltage events. |
| Clamping Voltage (VC) | 32.4 V at 6.2 A IPPM - limits downstream IC voltage exposure during 10/1000 μs surges, protecting 3.3 V/5 V logic rails. |
| Junction Capacitance (CD) | 283 pF at 0 V, 1 MHz - low enough for USB 2.0 (480 Mbps) and CAN FD signal integrity without excessive rise-time degradation. |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - exceeds Level 4 immunity requirements for consumer and automotive end-equipment. |
| Package | DO-219AB (SOD-123W) - 3.9 mm × 1.9 mm × 1.08 mm low-profile outline compatible with high-density PCB layouts and automated assembly. |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including HBM >8 kV, enabling use in ADAS camera links and body control modules. |
Pinout & Package
SMF20A-M3-18 uses the DO-219AB (SOD-123W) surface-mount package: 2-terminal, single-diode configuration with molded cathode band marking. Dimensions: 3.9 mm length × 1.9 mm width × 1.08 mm height. Compatible with IPC-7351B footprint (1.3 mm pad width, 2.9 mm pad length, 1.4 mm center-to-center spacing).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or common return path; establishes reference for clamping action during positive transients on cathode side. |
| Cathode | Protected line input | Connected to I/O line (e.g., USB D+, HDMI TMDS+); conducts surge current to anode during overvoltage, limiting voltage to ≤32.4 V. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables robust protection against lightning-induced surges and system-level EFT in industrial fieldbus nodes. |
| ±30 kV IEC 61000-4-2 ESD immunity | Eliminates need for secondary board-level ESD mitigation in handheld test equipment and portable diagnostics tools. |
| 283 pF junction capacitance | Preserves signal edge rate in 480 Mbps USB 2.0 differential pairs without measurable jitter increase or eye closure. |
| AEC-Q101 qualified | Validated for automotive temperature cycling, mechanical shock, and humidity testing - suitable for under-hood sensor interfaces. |
| Reflow-solderable SOD-123W package | Supports standard lead-free reflow profiles (peak 260 °C), eliminating hand-soldering risk in high-volume manufacturing. |
Applications
| USB 2.0 Port Protection | HDMI Source Interface |
|---|---|
|
Use Scenario: Protecting USB 2.0 upstream ports on industrial HMIs against ESD from operator touch and cable hot-plug events. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between D+ and ground, clamping transients before they reach the USB transceiver IC. Use Value: Maintains 480 Mbps data integrity by limiting clamping voltage to 32.4 V while adding only 283 pF loading - no signal attenuation or timing skew. |
Use Scenario: Safeguarding HDMI source outputs in automotive infotainment head units from ESD during display cable mating/unmating. IC Role / Device Role / Timing Role: Per-channel TVS on TMDS+ and TMDS− lines, referenced to chassis ground, suppressing fast-rising ESD pulses. Use Value: Prevents pixel corruption and link dropouts by clamping transients within 1 ns while preserving 165 MHz TMDS bandwidth via low capacitance. |
| Automotive Camera Link | Industrial RS-485 Node |
|
Use Scenario: Shielding FPD-Link III or GMSL serial video interfaces in ADAS cameras from ESD generated during vehicle service or environmental exposure. IC Role / Device Role / Timing Role: Single-line TVS on each differential pair (CLK+, DATA+), mounted adjacent to connector to minimize inductance. Use Value: Ensures uninterrupted video streaming by meeting AEC-Q101 requirements and clamping to ≤32.4 V without degrading 3 Gbps signal fidelity. |
Use Scenario: Protecting RS-485 transceivers in factory automation PLCs from induced surges on long trunk lines and ESD at terminal blocks. IC Role / Device Role / Timing Role: Bidirectional protection implemented using two SMF20A-M3-18 devices (cathode-to-line, anode-to-ground) per line. Use Value: Delivers 200 W surge handling and ±30 kV ESD immunity while maintaining <1 ns response - preventing transceiver latch-up or permanent damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A-E3/57T | DO-214AC (SMA) package; 3.5 mm × 2.5 mm × 1.5 mm; higher RthJA (200 K/W); 35.5 V VC at 6.2 A. | Less suitable for ultra-thin designs; requires larger PCB area; slightly higher clamping increases stress on protected ICs. | Select when legacy SMA footprint exists or higher thermal mass is needed for repetitive surge duty cycles. |
| TPD2E001DRYR | 2-channel, 0.65 mm × 0.65 mm DSBGA; 12 pF CD; 15 V VRWM; not AEC-Q101 qualified. | Better for high-speed USB 3.0/PCIe; insufficient for 20 V bus protection; limited surge rating (30 W). | Choose only for space-constrained, low-capacitance, non-automotive applications where VRWM ≤15 V suffices. |
Compared with SMAJ20A-E3/57T and TPD2E001DRYR, SMF20A-M3-18 uniquely balances low profile (1.08 mm), automotive qualification, 20 V VRWM headroom, and 283 pF capacitance - making it optimal for USB 2.0 and HDMI protection in thin, ruggedized, or automotive-certified systems.
Availability
SMF20A-M3-18 is available at Aetrix Electronics and suitable for USB 2.0 port protection, automotive camera links, and industrial RS-485 node designs requiring stable component supply, AEC-Q101 compliance, and consistent low-profile packaging.
Supply support for SMF20A-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 interface protection with optimized capacitance, clamping, and AEC-Q101 validation - engineered specifically for USB, HDMI, FPD-Link, and industrial communication buses.
FAQ
What is the maximum clamping voltage of SMF20A-M3-18 under standard surge conditions?
The SMF20A-M3-18 has a maximum clamping voltage (VC) of 32.4 V at 6.2 A peak pulse current with a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 and ensures downstream ICs operating at 3.3 V or 5 V remain within safe voltage limits during transient events. The clamping performance is guaranteed across -65 °C to +175 °C junction temperature range.
Is SMF20A-M3-18 suitable for automotive applications?
Yes, SMF20A-M3-18 is AEC-Q101 qualified and tested for human body model (HBM) >8 kV, making it suitable for automotive applications including infotainment systems, ADAS camera links, and body control modules. Its operating temperature range (-65 °C to +175 °C), moisture sensitivity level 1 rating, and reflow compatibility align with automotive manufacturing requirements.
What package type does SMF20A-M3-18 use, and what are its key dimensions?
SMF20A-M3-18 uses the DO-219AB (SOD-123W) package: 3.9 mm length × 1.9 mm width × 1.08 mm height, with cathode band marking. It is compatible with IPC-7351B footprint recommendations and supports wave and reflow soldering per J-STD-020 MSL level 1 guidelines, including peak temperatures up to 260 °C.
How does the 283 pF junction capacitance of SMF20A-M3-18 affect high-speed signal integrity?
The 283 pF junction capacitance of SMF20A-M3-18 is measured at 0 V and 1 MHz, and is low enough to preserve signal integrity in USB 2.0 (480 Mbps) and HDMI 1.4 (up to 165 MHz TMDS) applications. It introduces negligible rise-time degradation or insertion loss when placed close to connectors, unlike higher-capacitance alternatives that may cause eye diagram closure or bit errors.
What is the stand-off voltage (VRWM) and why is it important for SMF20A-M3-18 selection?
The stand-off voltage (VRWM) of SMF20A-M3-18 is 20 V - the maximum DC or continuous reverse voltage the device can withstand without exceeding 0.1 μA leakage current. This parameter ensures reliable operation on 18–20 V nominal buses (e.g., industrial 24 V rails with ripple) while providing sufficient margin before avalanche conduction begins, preventing false triggering during normal operation.
SMF20A-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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 6.2A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 283pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF20A-M3-18 FAQ
1.How can I place an order for SMF20A-M3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF20A-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 SMF20A-M3-18 reliable?
The price and inventory of SMF20A-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 SMF20A-M3-18 is usually 5 days.
3.What payment methods are accepted for SMF20A-M3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF20A-M3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF20A-M3-18?
SMF20A-M3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF20A-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 SMF20A-M3-18?
For technical support, including SMF20A-M3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF20A-M3-18 requirements.
6.How does Aetrix verify that SMF20A-M3-18 is sourced from the original manufacturer or authorized distributors?
All SMF20A-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 SMF20A-M3-18 meets industry standards.
7.What is the process for return or replacement of SMF20A-M3-18?
All SMF20A-M3-18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF20A-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 SMF20A-M3-18 part is unused and in its original packaging.
Return procedure for SMF20A-M3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF20A-M3-18 Tags
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