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Vishay General Semiconductor - Diodes Division SMF20A-E3-08
- Part No.:
- SMF20A-E3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF20A-E3-08.pdf
- Description:
- TVS DIODE 20VWM 32.4VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:26,255
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Product details
Overview
SMF20A-E3-08 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in DO-219AB (SOD-123W) package, designed for transient voltage suppression on I/O lines. It features 20 V standoff voltage (VRWM), 22.2–24.6 V reverse breakdown (VBR), 32.4 V maximum clamping voltage at 6.2 A peak pulse current, and 200 W peak pulse power (10/1000 μs). It is used in USB 2.0, HDMI, and industrial sensor interface protection.
For engineers reviewing the SMF20A-E3-08 datasheet, SMF20A-E3-08 pinout, SMF20A-E3-08 application, or SMF20A-E3-08 equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, IEC 61000-4-2 ±30 kV ESD immunity, low 283 pF capacitance at 0 V, and SOD-123W footprint compatibility - all critical for high-speed signal line protection design.
Technical Context
This device operates as a single-channel unidirectional TVS diode with cathode-anode polarity. Its low incremental surge resistance enables fast clamping response (<1 ns), and its "Low Noise" technology minimizes signal distortion during ESD events. The junction operates up to 175 °C and supports wave/reflow soldering per J-STD-020 MSL level 1.
It complies with IEC 61000-4-2 (±30 kV contact/air discharge) and AEC-Q101 (H3B class >8 kV HBM), making it suitable for automotive infotainment and industrial control interfaces where robustness against electrostatic discharge is mandatory.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 20 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 18–20 V nominal signal rails. |
| Reverse Breakdown (VBR) | 22.2–24.6 V at 1 mA - Confirmed minimum/maximum threshold where avalanche conduction initiates under DC test conditions. |
| Clamping Voltage (VC) | 32.4 V at 6.2 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge; ensures downstream ICs remain below absolute max ratings. |
| Peak Pulse Power | 200 W (10/1000 μs) - Sustains standardized lightning-like transients without degradation; validated per IEC 61000-4-5 waveform. |
| Capacitance (CD) | 283 pF at 0 V, 1 MHz - Low enough for USB 2.0 (480 Mbps) and RS-485 interfaces without signal integrity loss. |
| ESD Immunity | ±30 kV contact & air discharge (IEC 61000-4-2) - Meets highest industrial and automotive ESD stress requirements without failure. |
| Package | DO-219AB (SOD-123W) - 3.9 × 1.9 × 1.08 mm low-profile surface-mount outline compatible with automated assembly and space-constrained PCBs. |
Pinout & Package
SMF20A-E3-08 uses the DO-219AB (SOD-123W) package: a two-terminal, cathode-marked surface-mount device with molded plastic body and gull-wing leads. Dimensions are 3.9 mm length × 1.9 mm width × 1.08 mm height. Cathode marking is a bar on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Input/line side connection | Connected to protected signal line; conducts surge current toward ground when clamping occurs. |
| Cathode (bar-marked end) | Ground reference terminal | Connected to system ground plane; establishes reference for clamping action and defines unidirectional polarity. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables reliable suppression of high-energy transients in industrial and automotive environments without thermal runaway. |
| ±30 kV ESD immunity (IEC 61000-4-2) | Eliminates need for secondary ESD protection stages in handheld and panel-mounted equipment subject to frequent human contact. |
| 283 pF capacitance at 0 V | Preserves signal rise time and eye diagram integrity on 480 Mbps USB 2.0 and 100 Mbps Ethernet PHY lines. |
| AEC-Q101 qualified option available | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing. |
| Low-profile DO-219AB package | Reduces board area by 30% vs. SMA packages while maintaining thermal performance via 3 mm × 3 mm Cu pad mounting. |
Applications
| USB 2.0 Port Protection | HDMI Interface Protection |
|---|---|
Use Scenario: Protecting D+ and D− data lines of embedded USB host controllers from ESD events during cable insertion/removal. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between signal line and chassis ground, clamping transients within 1 ns. Use Value: Prevents latch-up or gate oxide damage in USB transceivers by limiting voltage to ≤32.4 V during ±30 kV contact discharge. |
Use Scenario: Safeguarding TMDS clock and data channels in set-top boxes and display controllers against handling-induced ESD. IC Role / Device Role / Timing Role: Low-capacitance transient suppressor mounted directly at HDMI connector pins. Use Value: Maintains signal integrity up to 2.25 Gbps with <283 pF loading and clamps surges before HDMI receiver input exceeds 3.6 V absolute max rating. |
| Industrial Sensor Interface | Automotive Infotainment I/O |
Use Scenario: Shielding analog and digital outputs of pressure/temperature sensors in PLC modules exposed to factory-floor ESD. IC Role / Device Role / Timing Role: Standoff-rated protector on 0–10 V or 4–20 mA output lines, referenced to local ground. Use Value: Ensures sensor accuracy remains unaffected by transients due to 20 V VRWM margin over 10 V full-scale range and low leakage (<0.1 μA). |
Use Scenario: Protecting UART, I²C, and CAN FD debug ports in head unit mainboards during service and integration testing. IC Role / Device Role / Timing Role: AEC-Q101-qualified ESD clamp on low-speed serial buses adjacent to user-accessible connectors. Use Value: Guarantees compliance with ISO 10605 (25 kV) and OEM-specific ESD protocols without requiring layout redesign or additional filtering. |
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 | Higher clamping voltage (34.0 V), larger SMA package (4.5 × 2.7 mm), 400 W peak power (10/1000 μs) | Less suitable for space-constrained USB/HDMI layouts; better for higher-energy surges in power supply rails | Select when board area allows larger footprint and clamping voltage margin >34 V is acceptable. |
| TPD2E001DRSR | Bi-directional dual-channel array, 12 pF typical capacitance, 5.5 V VRWM, integrated 10 Ω series resistors | Designed for ultra-high-speed interfaces (USB 3.0, DisplayPort); not rated for >20 V standoff or AEC-Q101 | Choose only for sub-6 V differential signaling; unsuitable as direct replacement for 20 V rail protection. |
Compared with SMAJ20A-E3/57T and TPD2E001DRSR, SMF20A-E3-08 offers optimal balance of compact DO-219AB size, 20 V standoff, and 32.4 V clamping - making it preferred for cost-sensitive, high-volume industrial and automotive I/O protection where strict capacitance and footprint constraints apply.
Availability
SMF20A-E3-08 is available at Aetrix Electronics and suitable for USB 2.0 port protection, HDMI interface safeguarding, and industrial sensor output conditioning requiring stable component supply across production lifecycles.
Supply support for SMF20A-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 industrial, automotive, and computing markets.
The SMF series targets high-speed data line protection with optimized capacitance, clamping, and AEC-Q101 qualification - engineered specifically for ESD-critical interfaces in harsh electromagnetic environments.
FAQ
What is the maximum clamping voltage of the SMF20A-E3-08 under standard test conditions?
The SMF20A-E3-08 has a maximum clamping voltage (VC) of 32.4 V when subjected to a 6.2 A peak pulse current with a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 and guarantees that protected circuits experience no more than 32.4 V during transient events - critical for ensuring compatibility with 3.3 V and 5 V logic interfaces. The SMF20A-E3-08 maintains this clamping performance across its full operating temperature range of –65 °C to +175 °C.
Is the SMF20A-E3-08 AEC-Q101 qualified?
The SMF20A-E3-08 is available in an AEC-Q101-qualified version (e.g., SMF20A-HE3_A08), but the base part number SMF20A-E3-08 itself is RoHS-compliant and wave/reflow solderable without explicit AEC-Q101 certification. Vishay documents AEC-Q101 qualification separately for HE3 variants; users requiring automotive-grade validation must specify the HE3 suffix. The SMF20A-E3-08 retains all core electrical specs - including ±30 kV ESD immunity and 200 W pulse power - regardless of qualification variant.
What is the capacitance of the SMF20A-E3-08 and how does it affect high-speed signal lines?
The SMF20A-E3-08 exhibits 283 pF typical capacitance at 0 V and 1 MHz, measured per standard test conditions. This value is low enough to avoid significant signal attenuation or timing skew on USB 2.0 (480 Mbps) and RS-485 links, where total line capacitance budgets typically allow ≤300 pF. The SMF20A-E3-08 achieves this while delivering 20 V standoff and robust ESD protection - a key differentiator versus higher-capacitance alternatives like P6SMB20A (500 pF).
Can the SMF20A-E3-08 be used in bidirectional signal paths such as USB D+/D−?
No - the SMF20A-E3-08 is a unidirectional TVS diode intended for single-polarity protection (e.g., supply rail or grounded-signal line). For bidirectional differential pairs like USB D+/D−, two SMF20A-E3-08 devices are required - one per line, each cathode tied to ground - or a dedicated bidirectional array (e.g., SMF20AY, which is not offered in this series). Using a single unidirectional device on a bidirectional line risks forward conduction during normal signal swings, potentially disrupting communication. The SMF20A-E3-08 must be applied with correct polarity alignment relative to system ground.
What is the thermal resistance (RthJA) of the SMF20A-E3-08 and how should it be managed on PCB?
The SMF20A-E3-08 has a junction-to-ambient thermal resistance (RthJA) of 180 K/W when mounted on an epoxy-glass PCB with 3 mm × 3 mm copper pads ≥40 μm thick. To maintain reliability during repetitive surge events, designers must replicate this copper area - using internal or external ground planes connected via multiple vias - and avoid routing heat-sensitive components nearby. The SMF20A-E3-08's 175 °C maximum junction temperature allows operation in high-ambient environments when thermal layout is properly implemented.
SMF20A-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):
- 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-E3-08 FAQ
1.How can I place an order for SMF20A-E3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF20A-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 SMF20A-E3-08 reliable?
The price and inventory of SMF20A-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 SMF20A-E3-08 is usually 5 days.
3.What payment methods are accepted for SMF20A-E3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF20A-E3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF20A-E3-08?
SMF20A-E3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF20A-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 SMF20A-E3-08?
For technical support, including SMF20A-E3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF20A-E3-08 requirements.
6.How does Aetrix verify that SMF20A-E3-08 is sourced from the original manufacturer or authorized distributors?
All SMF20A-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 SMF20A-E3-08 meets industry standards.
7.What is the process for return or replacement of SMF20A-E3-08?
All SMF20A-E3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF20A-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 SMF20A-E3-08 part is unused and in its original packaging.
Return procedure for SMF20A-E3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF20A-E3-08 Tags
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