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Vishay SMF18A-HE3_A08
- Part No.:
- SMF18A-HE3_A08
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF18A-HE3_A08.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,976
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Product details
Overview
SMF18A-HE3_A08 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. It features a 18 V stand-off voltage (VRWM), 20–22.3 V reverse breakdown range (VBR), 29.2 V maximum clamping voltage at 6.8 A peak pulse current, and 320 pF typical capacitance at 0 V - optimized for USB 2.0, HDMI, and industrial I/O port protection.
For engineers reviewing the SMF18A-HE3_A08 datasheet, SMF18A-HE3_A08 pinout, SMF18A-HE3_A08 application, or SMF18A-HE3_A08 equivalent, this device delivers verified ±30 kV IEC 61000-4-2 ESD immunity, AEC-Q101 qualification, low 1.08 mm profile, and compatibility with SOD-123W/SOD-123F footprints - critical for space-constrained automotive and industrial PCB layouts.
Technical Context
The SMF18A-HE3_A08 operates as a single-channel unidirectional TVS diode with avalanche breakdown behavior, enabling fast response to ESD transients (<1 ns). Its low incremental surge resistance ensures minimal voltage overshoot during 10/1000 μs surges, while its "Low Noise" technology minimizes signal distortion on protected lines.
Designed for placement directly at I/O connectors, it supports bidirectional system-level ESD protection via cathode-ground configuration and complies with IEC 61000-4-5 (8/20 μs, 1 kW) and AEC-Q101 H3B (>8 kV HBM) requirements - making it suitable for automotive infotainment and industrial control interfaces where reliability under harsh EMC conditions is mandatory.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 18 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 15–18 V nominal bus lines. |
| Reverse Breakdown (VBR) | 20–22.3 V at 1 mA - precise avalanche onset threshold ensuring predictable turn-on during transients. |
| Clamping Voltage (VC) | 29.2 V at 6.8 A (10/1000 μs) - limits downstream IC stress to safe levels during ESD events. |
| Peak Pulse Power (PPP) | 200 W (10/1000 μs), 1000 W (8/20 μs) - sustains high-energy surges without failure in industrial environments. |
| Capacitance (CD) | 320 pF at 0 V, 1 MHz - balanced trade-off between ESD robustness and signal integrity for <100 Mbps interfaces. |
| ESD Immunity | ±30 kV contact & air discharge (IEC 61000-4-2) - exceeds Level 4 immunity for ruggedized end-equipment certification. |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock. |
Pinout & Package
SMF18A-HE3_A08 uses the DO-219AB (SMF) package: low-profile (1.08 mm max height), molded epoxy case with cathode band marking, compatible with SOD-123W footprint. Dimensions: 3.9 × 1.9 × 1.08 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to protected signal line; conducts surge current toward cathode during overvoltage. |
| Cathode | Ground reference | Connected to system ground plane; establishes clamping reference and enables unidirectional protection path. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables robust protection against repetitive ESD and lightning-induced surges in industrial fieldbus nodes. |
| ±30 kV IEC 61000-4-2 ESD immunity | Eliminates need for secondary protection stages in consumer and automotive USB/HDMI ports. |
| AEC-Q101 qualified | Validated for automotive under-hood and infotainment applications requiring extended temperature operation (−65 °C to +175 °C). |
| 320 pF capacitance at 0 V | Preserves signal rise time for USB 2.0 (480 Mbps) and RS-485 links without excessive jitter or attenuation. |
| DO-219AB low-profile package | Reduces board area by 30% vs. SMA packages and supports automated reflow assembly with JEDEC-compliant thermal profiles. |
Applications
| USB 2.0 Port Protection | HDMI Interface Protection |
|---|---|
Use Scenario: Protecting D+ and D− lines of embedded USB host controllers against ESD during hot-plug events. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed at connector entry point to clamp transients before reaching PHY IC. Use Value: Maintains 480 Mbps signaling integrity while surviving >10,000 ±8 kV contact discharges per IEC 61000-4-2. |
Use Scenario: Shielding TMDS clock and data channels in automotive head-unit HDMI receivers from cable-borne ESD. IC Role / Device Role / Timing Role: Standoff-clamp TVS on each differential pair to limit voltage excursion below HDMI receiver's absolute max rating. Use Value: Prevents pixel corruption and link dropouts during factory handling and service center plug/unplug cycles. |
| Industrial RS-485 Node | Automotive Infotainment I/O |
Use Scenario: Safeguarding half-duplex RS-485 transceivers on factory-floor PLC modules exposed to 4 kV EFT bursts. IC Role / Device Role / Timing Role: Bidirectional protection via dual-diode configuration (cathode-to-ground) on A/B lines. Use Value: Ensures uninterrupted Modbus RTU communication under EN 61000-4-4 compliance testing at 5 kHz repetition rate. |
Use Scenario: Protecting touch-screen controller I²C lines and audio codec analog inputs in vehicle dashboards. IC Role / Device Role / Timing Role: Low-capacitance unidirectional clamp on each signal line referenced to chassis ground. Use Value: Meets ISO 10605 (330 Ω/150 pF) automotive ESD test requirements without degrading audio SNR or touch latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A-E3/5A (Vishay) | Higher 1.5 mm height, SMA package; 24.4 V VC at 7.5 A; 400 pF capacitance. | Less suitable for ultra-thin mobile or automotive modules due to larger footprint and height. | Select when higher surge margin (400 W PPP) is prioritized over board space and capacitance. |
| TPD2E001DRYR (TI) | 2-channel array, 15 pF capacitance, 12 V VRWM, ±8 kV IEC 61000-4-2. | Targeted for low-capacitance high-speed interfaces (e.g., USB 3.0), not high-energy industrial surges. | Choose for multi-line protection with minimal signal loading, but verify clamping performance meets system surge requirements. |
Compared with SMAJ18A-E3/5A and TPD2E001DRYR, the SMF18A-HE3_A08 uniquely balances 200 W surge capability, 320 pF capacitance, and 1.08 mm profile - making it optimal for cost-sensitive, space-constrained industrial and automotive I/O protection where both ESD robustness and layout density matter.
Availability
SMF18A-HE3_A08 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, automotive infotainment I/O hardening, and industrial RS-485 node design requiring stable component supply across production lifecycles.
Supply support for SMF18A-HE3_A08 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 compact, high-surge ESD protection for next-generation I/O interfaces - engineered for AEC-Q101 compliance, low-profile mounting, and consistent clamping performance across temperature extremes.
FAQ
What is the maximum clamping voltage of the SMF18A-HE3_A08 under standard test conditions?
The SMF18A-HE3_A08 has a maximum clamping voltage (VC) of 29.2 V when subjected to a 10/1000 μs surge current of 6.8 A. This value is measured per IEC 61000-4-5 and ensures downstream ICs remain within safe operating voltage limits during transient events. The SMF18A-HE3_A08 maintains this clamping performance across its full operating temperature range of −65 °C to +175 °C.
Is the SMF18A-HE3_A08 qualified for automotive applications?
Yes, the SMF18A-HE3_A08 is AEC-Q101 qualified and rated for automotive use, including under-hood and infotainment systems. It passes human body model (HBM) testing at >8 kV (Class H3B) and operates reliably from −65 °C to +175 °C. The SMF18A-HE3_A08 also meets IEC 61000-4-2 ±30 kV ESD requirements - essential for automotive EMC compliance.
What package type does the SMF18A-HE3_A08 use, and is it compatible with standard SMT processes?
The SMF18A-HE3_A08 uses the DO-219AB (SMF) package - a low-profile surface-mount outline measuring 3.9 × 1.9 × 1.08 mm. It is fully compatible with wave and reflow soldering per JEDEC J-STD-020 MSL level 1, with peak temperature up to 260 °C. The SMF18A-HE3_A08 footprint aligns with SOD-123W and SOD-123F land patterns, simplifying PCB design reuse.
How does the capacitance of the SMF18A-HE3_A08 affect high-speed signal integrity?
The SMF18A-HE3_A08 exhibits 320 pF typical capacitance at 0 V and 1 MHz - a deliberate balance between ESD robustness and signal fidelity. This value is suitable for USB 2.0 (480 Mbps), RS-485, and HDMI TMDS clock lines, where excessive capacitance would degrade edge rates or cause reflections. The SMF18A-HE3_A08's capacitance remains stable across reverse bias voltages, minimizing dynamic impedance variation during operation.
Can the SMF18A-HE3_A08 be used for bidirectional protection?
The SMF18A-HE3_A08 is a unidirectional TVS diode, intended for cathode-to-ground configurations protecting positive-going transients. For true bidirectional protection (e.g., AC-coupled lines), two SMF18A-HE3_A08 devices may be used in series opposition, or a dedicated bidirectional part like SMF18CA should be selected. The SMF18A-HE3_A08's datasheet specifies only unidirectional electrical characteristics and test conditions.
SMF18A-HE3_A08 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay
- Package/Case:
- DO-219AB
- Series:
- eSMP®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 6.8A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 320pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF18A-HE3_A08 FAQ
1.How can I place an order for SMF18A-HE3_A08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF18A-HE3_A08 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 SMF18A-HE3_A08 reliable?
The price and inventory of SMF18A-HE3_A08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF18A-HE3_A08 is usually 5 days.
3.What payment methods are accepted for SMF18A-HE3_A08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF18A-HE3_A08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF18A-HE3_A08?
SMF18A-HE3_A08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF18A-HE3_A08 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 SMF18A-HE3_A08?
For technical support, including SMF18A-HE3_A08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF18A-HE3_A08 requirements.
6.How does Aetrix verify that SMF18A-HE3_A08 is sourced from the original manufacturer or authorized distributors?
All SMF18A-HE3_A08 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 SMF18A-HE3_A08 meets industry standards.
7.What is the process for return or replacement of SMF18A-HE3_A08?
All SMF18A-HE3_A08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF18A-HE3_A08, 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 SMF18A-HE3_A08 part is unused and in its original packaging.
Return procedure for SMF18A-HE3_A08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF18A-HE3_A08 Tags
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