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Vishay General Semiconductor - Diodes Division SMF20A-M3-08
- Part No.:
- SMF20A-M3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF20A-M3-08.pdf
- Description:
- TVS DIODE 20VWM 32.4VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:8,283
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Product details
Overview
SMF20A-M3-08 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for transient voltage suppression in high-speed data lines and power rails. It features a 20 V stand-off voltage (VRWM), 32.4 V maximum clamping voltage at 6.2 A peak pulse current, 200 W peak pulse power (10/1000 μs), ±30 kV IEC 61000-4-2 ESD immunity, and 283 pF typical capacitance at 0 V - deployed in automotive infotainment USB interfaces.
For engineers reviewing the SMF20A-M3-08 datasheet, SMF20A-M3-08 pinout, SMF20A-M3-08 application, or SMF20A-M3-08 equivalent, this page delivers verified electrical parameters, package dimensions, clamping behavior under surge conditions, AEC-Q101 qualification status, and real-world ESD protection use cases - all aligned to Vishay's Rev. 2.4 specification (Doc. #85881).
Technical Context
This device operates as a single-channel, unidirectional TVS diode with avalanche breakdown mechanism. Its low incremental surge resistance enables fast response (<1 ns) and tight clamping during ESD events, while its SOD-123W-compatible DO-219AB footprint supports automated assembly on dense PCBs.
The SMF20A-M3-08 is rated for operation from −65 °C to +175 °C, with thermal resistance RthJA = 180 K/W on standard 3 mm × 3 mm Cu pads. It meets AEC-Q101 stress testing for human body model (H3B >8 kV) and IEC 61000-4-2 contact/air discharge (±30 kV), confirming suitability for automotive-grade signal line protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 20 V - maximum continuous reverse working voltage before leakage exceeds 0.1 µA; defines safe operating margin below clamping threshold. |
| Clamping Voltage (VC) | 32.4 V at IPPM = 6.2 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 (PPP) | 200 W (10/1000 µs) - energy-handling capability for short-duration transients; sufficient for IEC 61000-4-5 Level 2 surges. |
| Capacitance (CD) | 283 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 Withstand | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - exceeds industrial and automotive ESD immunity requirements without external filtering. |
| Operating Temp Range | −65 °C to +175 °C - supports under-hood automotive, industrial control, and aerospace environments where thermal cycling is extreme. |
Pinout & Package
The SMF20A-M3-08 uses the DO-219AB (SMF) package: low-profile, surface-mount, cathode-bar marked, compatible with SOD-123W footprint. Dimensions: 3.9 mm × 1.9 mm × 1.08 mm (L × W × H). Mold compound rated UL 94 V-0; MSL level 1 (J-STD-020); reflow compatible up to 260 °C peak.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side of protected line (e.g., USB D+) | Connected to signal/power source; conducts during reverse-biased ESD event to shunt current to ground. |
| Cathode | Ground reference terminal | Connected to system ground plane; establishes clamping reference; polarity marking bar identifies this terminal. |
Key Features
| Feature | Design Value |
|---|---|
| "Low Noise" fast-response technology | Sub-nanosecond response time ensures clamping activation before ESD pulse edge damages sensitive receivers. |
| AEC-Q101 qualified | Validated for automotive applications including infotainment, ADAS sensors, and body electronics requiring reliability over temperature and lifetime. |
| Wave and reflow solderable | Compatible with standard SMT processes (peak temp ≤260 °C); eliminates hand-soldering risk and supports high-volume manufacturing. |
| Low incremental surge resistance | Minimizes voltage overshoot during high-di/dt events, improving clamping precision and reducing stress on downstream ICs. |
Applications
| Automotive USB 2.0 Interface | Industrial CAN FD Bus Node |
|---|---|
Use Scenario: Protecting USB D+/D− lines in vehicle head units against hot-plug ESD and load-dump induced transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between connector and USB transceiver IC to clamp surges before they reach PHY pins. Use Value: 283 pF capacitance preserves 480 Mbps signal integrity; 32.4 V clamping prevents damage to USB PHY rated for 3.6 V absolute max on I/O pins. |
Use Scenario: Shielding CAN FD transceivers in factory automation controllers from ESD events during cable handling and field maintenance. IC Role / Device Role / Timing Role: Standalone ESD suppressor on CAN_H/CAN_L differential pair, mounted adjacent to connector to minimize loop inductance. Use Value: ±30 kV IEC 61000-4-2 rating exceeds EN 50121-4 requirements; DO-219AB package allows placement within 5 mm of connector for optimal protection efficacy. |
| Medical Patient Monitor Sensor Port | Smart Building PoE-Powered Access Control |
Use Scenario: Safeguarding analog sensor inputs (e.g., ECG leads) connected via mini-USB or micro-B ports from clinical ESD events. IC Role / Device Role / Timing Role: Primary ESD barrier at entry point, coordinated with secondary RC filtering to meet IEC 61000-4-2 immunity targets. Use Value: −65 °C to +175 °C operating range accommodates sterilization cycles and extended shelf life; AEC-Q101 qualification signals robustness for medical-grade reliability. |
Use Scenario: Protecting 10/100BASE-TX Ethernet PHYs in PoE-powered door readers from lightning-induced surges entering via RJ45 jacks. IC Role / Device Role / Timing Role: Secondary-level TVS on each twisted pair (TX+/TX−, RX+/RX−), placed after common-mode chokes to handle differential-mode transients. Use Value: 200 W peak pulse power handles 10/1000 µs surges per IEC 61000-4-5; 20 V VRWM ensures no DC loading on 2.5 V or 3.3 V PHY bias networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A-E3/57T | Higher clamping voltage (34.5 V at 6.1 A), larger SMA (DO-214AC) package (4.5 mm × 2.7 mm), 3x higher capacitance (550 pF). | Better suited for lower-speed interfaces (RS-485, RS-232); less ideal for USB 2.0 due to bandwidth limitation. | Select when board space permits larger footprint and signal speed <10 Mbps; avoid for high-speed data lines. |
| TPD2E007DRYR | 2-channel, bidirectional, 10 pF ultra-low capacitance, but only 150 W PPP and ±8 kV HBM ESD rating (not IEC 61000-4-2 certified). | Targeted at portable consumer USB ports; lacks automotive qualification and high-energy surge capability. | Choose for space-constrained mobile designs where ESD threat is limited to user handling; not for industrial or automotive deployment. |
Compared with SMAJ20A-E3/57T and TPD2E007DRYR, the SMF20A-M3-08 uniquely balances 200 W surge handling, ±30 kV IEC-rated ESD immunity, AEC-Q101 qualification, and 283 pF capacitance - making it the preferred choice for automotive and industrial high-speed interface protection where both robustness and signal fidelity are required.
Availability
SMF20A-M3-08 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial CAN FD nodes, and medical patient monitor sensor ports requiring stable component supply across long production lifecycles.
Supply support for SMF20A-M3-08 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 Intertechnology is a global semiconductor manufacturer specializing in discrete components, passive elements, and sensors, with leadership in reliability-critical applications.
The SMF series belongs to Vishay's eSMP® family of surface-mount TVS diodes, engineered specifically for high-reliability ESD and surge protection in automotive, industrial, and medical systems where AEC-Q101 compliance and low-clamp performance are mandatory.
FAQ
What is the clamping voltage of the SMF20A-M3-08 under a 10/1000 µs surge?
The SMF20A-M3-08 has a maximum clamping voltage (VC) of 32.4 V at a peak pulse current (IPPM) of 6.2 A using the 10/1000 µs waveform. This value is measured per Vishay's datasheet (Rev. 2.4, Doc. #85881) and reflects the actual voltage imposed on the protected line during standardized surge testing - critical for ensuring downstream ICs remain within their absolute maximum ratings. The SMF20A-M3-08 achieves this with low incremental resistance and sub-nanosecond response.
Is the SMF20A-M3-08 qualified to AEC-Q101?
Yes, the SMF20A-M3-08 is AEC-Q101 qualified, as confirmed in Vishay's official documentation for the SMF5V0A–SMF58A family. It passes human body model (HBM) Class H3B (>8 kV), machine model (MM), and temperature cycling tests required for automotive electronics. This qualification applies directly to the SMF20A-M3-08 variant and supports its use in engine control units, infotainment modules, and ADAS sensor interfaces where automotive-grade reliability is mandated.
What is the capacitance of the SMF20A-M3-08 and how does it affect high-speed signals?
The SMF20A-M3-08 exhibits 283 pF typical junction capacitance at 0 V and 1 MHz, per Vishay's electrical characteristics table. This value is low enough to maintain signal integrity on USB 2.0 (480 Mbps) and CAN FD (up to 5 Mbps) buses without significant rise-time degradation or insertion loss. Unlike higher-capacitance alternatives (e.g., >500 pF), the SMF20A-M3-08 avoids data eye closure - a key reason why it is specified in automotive USB port designs. The SMF20A-M3-08 achieves this balance without sacrificing ESD robustness.
Does the SMF20A-M3-08 have polarity marking, and how is it oriented on the PCB?
Yes, the SMF20A-M3-08 features a cathode bar marking on the top surface of the DO-219AB package, consistent with industry-standard diode polarity identification. When mounted, the cathode (bar-marked end) must connect to the system ground plane, while the anode connects to the line being protected (e.g., USB D+). The recommended footprint matches SOD-123W dimensions (3.9 mm × 1.9 mm), and orientation in tape follows Vishay's carrier tape diagram (Doc. #85881, p.6), with cathode toward the sprocket hole side during reel unspooling.
What is the maximum operating temperature range for the SMF20A-M3-08?
The SMF20A-M3-08 is rated for continuous operation from −65 °C to +175 °C, as stated in the Absolute Maximum Ratings table of Vishay's datasheet (Rev. 2.4). This wide range supports deployment in under-hood automotive environments, industrial motor drives, and aerospace avionics where ambient temperatures exceed 125 °C. Junction temperature limits remain valid across this full range, and thermal resistance (RthJA = 180 K/W) is specified for standard 3 mm × 3 mm Cu pads - enabling accurate thermal modeling for the SMF20A-M3-08 in high-power-density layouts.
SMF20A-M3-08 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):
- 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-M3-08 FAQ
1.How can I place an order for SMF20A-M3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF20A-M3-08 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 SMF20A-M3-08 reliable?
The price and inventory of SMF20A-M3-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF20A-M3-08 is usually 5 days.
3.What payment methods are accepted for SMF20A-M3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF20A-M3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF20A-M3-08?
SMF20A-M3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF20A-M3-08 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 SMF20A-M3-08?
For technical support, including SMF20A-M3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF20A-M3-08 requirements.
6.How does Aetrix verify that SMF20A-M3-08 is sourced from the original manufacturer or authorized distributors?
All SMF20A-M3-08 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 SMF20A-M3-08 meets industry standards.
7.What is the process for return or replacement of SMF20A-M3-08?
All SMF20A-M3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF20A-M3-08, 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 SMF20A-M3-08 part is unused and in its original packaging.
Return procedure for SMF20A-M3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF20A-M3-08 Tags
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