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Vishay General Semiconductor - Diodes Division SMF11A-HE3-08
- Part No.:
- SMF11A-HE3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF11A-HE3-08.pdf
- Description:
- TVS DIODE 11VWM 18.2VC DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,131
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Product details
Overview
SMF11A-HE3-08 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for transient voltage suppression in low-capacitance signal lines. It features a 11 V standoff voltage (VRWM), 12.2–13.5 V breakdown range (VBR), 18.2 V maximum clamping voltage at 11 A peak pulse current, ±30 kV IEC 61000-4-2 ESD immunity, and 509 pF typical capacitance at 0 V - optimized for USB 2.0, HDMI, and industrial sensor interfaces.
For engineers reviewing the SMF11A-HE3-08 datasheet, SMF11A-HE3-08 pinout, SMF11A-HE3-08 application, or SMF11A-HE3-08 equivalent, key selection criteria include clamping performance under 10/1000 μs surge, low capacitance for high-speed data integrity, AEC-Q101 qualification status, thermal resistance (180 K/W), and compatibility with SOD-123W footprint layouts.
Technical Context
This device operates as a single-channel unidirectional TVS diode, leveraging silicon avalanche technology to clamp transient overvoltages before they damage downstream ICs. Its low incremental surge resistance ensures rapid response (<1 ns) and stable clamping across repeated ESD events.
The SMF11A-HE3-08 is rated for 200 W peak pulse power (10/1000 μs), 1000 W (8/20 μs), and supports continuous operation from –65 °C to +175 °C. It meets IEC 61000-4-2 (±30 kV contact/air) and AEC-Q101 Class H3B (>8 kV HBM), making it suitable for automotive infotainment and industrial control I/O protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 11 V - maximum continuous reverse operating voltage before leakage exceeds 0.1 μA; defines safe signal swing range for protected line. |
| Breakdown Voltage (VBR) | 12.2–13.5 V at 1 mA - onset of avalanche conduction; ensures reliable triggering above normal signal peaks. |
| Clamping Voltage (VC) | 18.2 V at 11 A (10/1000 μs) - maximum voltage seen by protected circuit during surge; critical for IC input tolerance margin. |
| Capacitance (CD) | 509 pF at 0 V, 1 MHz - low enough for USB 2.0 (480 Mbps) and RS-485, but not suitable for USB 3.x or PCIe Gen3. |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - exceeds Level 4 immunity requirements for industrial and automotive end-equipment. |
| Package | DO-219AB (SOD-123W-compatible) - 3.9 × 1.9 × 1.08 mm low-profile outline enabling dense PCB layouts and automated reflow assembly. |
| Thermal Resistance | 180 K/W (RthJA, on 3 mm × 3 mm Cu pads) - determines junction temperature rise under sustained leakage or repetitive surges. |
Pinout & Package
SMF11A-HE3-08 uses the DO-219AB (SMF) package: a two-terminal, cathode-marked, surface-mount plastic case with gull-wing leads. Dimensions are 3.9 mm length × 1.9 mm width × 1.08 mm height. The cathode bar identifies Terminal 2; Terminal 1 is anode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Terminal 1) | Input side of protected signal path | Connected to the line requiring ESD protection (e.g., USB D+); conducts surge current toward ground when clamped. |
| Cathode (Terminal 2, marked) | Ground reference node | Connected to system ground or chassis; establishes polarity for unidirectional clamping and defines breakdown threshold. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables robust protection against common lightning-induced and inductive-switching transients in industrial fieldbus nodes. |
| ±30 kV IEC 61000-4-2 ESD immunity | Meets highest severity level for user-accessible ports without external shielding or layout mitigation. |
| AEC-Q101 qualified (H3B class) | Validated for automotive under-hood and infotainment applications where reliability under thermal cycling and vibration is mandatory. |
| Low 509 pF capacitance | Minimizes signal distortion on 480 Mbps USB 2.0 differential pairs while maintaining >20 dB return loss up to 100 MHz. |
| SOD-123W footprint compatibility | Allows drop-in replacement or shared PCB land pattern with legacy SOD-123F/SOD-123FL packages, reducing layout redesign effort. |
Applications
| USB 2.0 Interface Protection | HDMI Source Port Protection |
|---|---|
|
Use Scenario: Protecting USB 2.0 D+/D− lines in portable medical monitors against ESD events during cable insertion or handling. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between connector and USB transceiver IC to shunt ESD energy to ground before reaching PHY inputs. Use Value: Clamps transients to ≤18.2 V within <1 ns, preserving signal integrity and preventing latch-up in the USB PHY while adding only 509 pF loading. |
Use Scenario: Safeguarding HDMI source outputs (TX0+/−, TX1+/−, etc.) in set-top boxes exposed to frequent hot-plug and static discharge. IC Role / Device Role / Timing Role: Per-lane ESD suppressor mounted adjacent to HDMI connector, referenced to chassis ground to minimize common-mode noise coupling. Use Value: Maintains HDMI 1.4 bandwidth (up to 3.4 Gbps) with sub-0.5 dB insertion loss at 1.7 GHz due to controlled 509 pF capacitance and low parasitic inductance. |
| Industrial Sensor Signal Conditioning | Automotive Infotainment Display Link |
|
Use Scenario: Protecting analog output lines (4–20 mA, 0–10 V) from ESD and fast transients in factory-floor pressure/temperature sensors. IC Role / Device Role / Timing Role: Low-leakage (0.1 μA max at 11 V) unidirectional clamp that avoids DC offset errors in precision analog signal paths. Use Value: Ensures <10 ppm full-scale error contribution at 25 °C and maintains accuracy over –40 °C to +125 °C operating range. |
Use Scenario: Shielding MIPI DSI or LVDS display interface traces in automotive head units from ESD during service or environmental exposure. IC Role / Device Role / Timing Role: AEC-Q101-qualified TVS placed at display connector to meet ISO 10605 and OEM-specific ESD test plans (e.g., Ford CS-2009). Use Value: Delivers ±30 kV contact discharge immunity without derating at +105 °C ambient, supporting ASIL-B functional safety compliance for display subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ11A-E3/57T | Higher clamping voltage (23.5 V at 10.1 A), larger SMA package (4.5 × 2.7 × 2.2 mm), 1000 W (8/20 μs) rating | Better suited for higher-energy surges (e.g., 48 V industrial bus), but excessive capacitance (1000 pF) limits high-speed data use | Select when surge energy exceeds 200 W (10/1000 μs) and board space allows larger footprint. |
| TPD2E001DRYR | Two-channel, bidirectional, 12 pF capacitance, integrated 5 V rail clamp, 0.65 mm × 0.65 mm DRY package | Designed for ultra-high-speed interfaces (USB 3.1, HDMI 2.0); lacks AEC-Q101 qualification and 30 kV ESD rating | Choose for space-constrained consumer electronics with multi-line protection needs, not automotive or industrial ESD-critical zones. |
Compared with SMAJ11A-E3/57T and TPD2E001DRYR, SMF11A-HE3-08 uniquely balances low capacitance (509 pF), AEC-Q101 qualification, ±30 kV ESD rating, and compact DO-219AB packaging - making it optimal for cost-sensitive, high-reliability USB 2.0 and industrial analog I/O protection where both speed and ruggedness matter.
Availability
SMF11A-HE3-08 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI source port hardening, and industrial sensor signal conditioning requiring stable component supply and long-term lifecycle support.
Supply support for SMF11A-HE3-08 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 data line protection with AEC-Q101 qualification, low capacitance, and robust ESD immunity - engineered specifically for USB, HDMI, and industrial I/O interfaces demanding both signal fidelity and ruggedness.
FAQ
What is the maximum clamping voltage of the SMF11A-HE3-08 under standard surge conditions?
The SMF11A-HE3-08 has a maximum clamping voltage (VC) of 18.2 V when subjected to an 11 A peak pulse current with a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 test conditions and ensures downstream ICs see no more than 18.2 V during transient events - critical for protecting 3.3 V or 5 V logic inputs. The SMF11A-HE3-08 achieves this while maintaining low dynamic impedance and fast response time.
Is the SMF11A-HE3-08 qualified for automotive applications?
Yes, the SMF11A-HE3-08 is AEC-Q101 qualified and rated for Class H3B human body model (HBM) with >8 kV ESD immunity. It operates across –65 °C to +175 °C and meets IEC 61000-4-2 ±30 kV contact/air discharge - satisfying requirements for infotainment, body control, and sensor modules in passenger vehicles. The SMF11A-HE3-08 is commonly used in automotive USB charging ports and display link protection.
What is the capacitance of the SMF11A-HE3-08 and how does it affect high-speed signal integrity?
The SMF11A-HE3-08 exhibits 509 pF typical capacitance at 0 V and 1 MHz. This value is low enough to avoid significant degradation of USB 2.0 (480 Mbps) eye diagrams or HDMI 1.4 timing margins, but too high for USB 3.x or PCIe Gen3. The SMF11A-HE3-08's capacitance is tightly controlled via process optimization to ensure consistent signal loading across production lots.
Can the SMF11A-HE3-08 be used in bidirectional signal protection?
No - the SMF11A-HE3-08 is a unidirectional TVS diode, intended for DC-biased or ground-referenced signal lines like USB D+ or HDMI TMDS+ where polarity is fixed. For truly bidirectional AC-coupled signals (e.g., RS-485, CAN), a bidirectional variant such as SMF11CA-HE3-08 would be required. Using SMF11A-HE3-08 on bidirectional lines risks forward conduction during negative swings and invalidates clamping behavior.
What package type does the SMF11A-HE3-08 use and what are its mounting considerations?
The SMF11A-HE3-08 uses the DO-219AB (SMF) package: 3.9 mm × 1.9 mm × 1.08 mm with gull-wing leads and cathode marking. It is wave and reflow solderable, compatible with IPC-7095 guidelines for SOD-123W footprints. Recommended pad dimensions are 1.3 mm × 2.9 mm with 1.4 mm spacing; thermal relief vias under the cathode pad improve heat dissipation during surge events. The SMF11A-HE3-08 requires MSL Level 1 handling.
SMF11A-HE3-08 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):
- 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:
- -
- Capacitance @ Frequency:
- 509pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF11A-HE3-08 FAQ
1.How can I place an order for SMF11A-HE3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF11A-HE3-08 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 SMF11A-HE3-08 reliable?
The price and inventory of SMF11A-HE3-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF11A-HE3-08 is usually 5 days.
3.What payment methods are accepted for SMF11A-HE3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF11A-HE3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF11A-HE3-08?
SMF11A-HE3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF11A-HE3-08 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 SMF11A-HE3-08?
For technical support, including SMF11A-HE3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF11A-HE3-08 requirements.
6.How does Aetrix verify that SMF11A-HE3-08 is sourced from the original manufacturer or authorized distributors?
All SMF11A-HE3-08 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 SMF11A-HE3-08 meets industry standards.
7.What is the process for return or replacement of SMF11A-HE3-08?
All SMF11A-HE3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF11A-HE3-08, 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 SMF11A-HE3-08 part is unused and in its original packaging.
Return procedure for SMF11A-HE3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF11A-HE3-08 Tags
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