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Vishay SMF20A-HE3_A18
- Part No.:
- SMF20A-HE3_A18
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF20A-HE3_A18.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,473
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Product details
Overview
SMF20A-HE3_A18 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 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 283 pF typical junction capacitance at 0 V - optimized for USB 2.0, HDMI, and industrial I/O port protection.
For engineers reviewing the SMF20A-HE3_A18 datasheet, SMF20A-HE3_A18 pinout, SMF20A-HE3_A18 application, or SMF20A-HE3_A18 equivalent, key selection criteria include its ±30 kV IEC 61000-4-2 ESD immunity, AEC-Q101 qualification, low 1.08 mm profile, and compatibility with SOD-123W/SOD-123F footprint layouts.
Technical Context
This device operates as a single-channel unidirectional TVS diode, leveraging silicon avalanche technology to clamp transients above VRWM while maintaining low leakage (<0.1 µA at 20 V). Its 10/1000 µs waveform rating delivers 200 W peak pulse power, and its 8/20 µs IEC 61000-4-5 rating supports 1000 W surge handling.
The SMF20A-HE3_A18 integrates "Low Noise" fast-response design with <1 ns rise time, enabling sub-nanosecond ESD event suppression. Thermal resistance is 180 K/W when mounted on 3 mm × 3 mm Cu pads, supporting operation across -65 °C to +175 °C ambient range without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 20 V - defines maximum continuous operating voltage before clamping begins; suitable for 18–20 V nominal bus systems. |
| Breakdown Voltage (VBR) | 22.2–24.6 V at 1 mA - ensures reliable triggering margin above VRWM; guarantees conduction onset within defined tolerance band. |
| Clamping Voltage (VC) | 32.4 V at 6.2 A (10/1000 µs) - limits downstream IC voltage stress during surge events; enables safe interface with 3.3 V or 5 V logic rails. |
| Junction Capacitance (CD) | 283 pF at 0 V, 1 MHz - balances ESD robustness and signal integrity; appropriate for ≤480 Mbps USB 2.0 but not USB 3.x or PCIe Gen3. |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - exceeds automotive and industrial immunity requirements; eliminates need for secondary ESD stages. |
| Package | DO-219AB (SOD-123W compatible) - 3.9 × 1.9 × 1.08 mm low-profile outline; supports automated placement and reflow soldering at ≤260 °C peak. |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including HBM >8 kV; approved for under-hood and infotainment system use. |
Pinout & Package
SMF20A-HE3_A18 uses the DO-219AB (SMF) package: anodic cathode-marked, two-terminal surface-mount device with cathode indicated by a bar on the top surface. The package conforms to JEDEC MO-229 and is mechanically compatible with SOD-123W footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Input/Line side connection | Connected to protected signal line; conducts surge current toward ground during overvoltage events. |
| Cathode (K) | Ground reference terminal | Connected to system ground plane; establishes clamping reference and completes transient current 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 control interfaces. |
| ±30 kV IEC 61000-4-2 ESD immunity | Eliminates external ESD test failures in end-equipment certification without additional shielding or layout changes. |
| AEC-Q101 qualification | Validates long-term reliability under thermal cycling, humidity, and mechanical stress for automotive electronics deployment. |
| Low 1.08 mm height | Permits integration into space-constrained modules such as portable medical sensors and wearable IoT edge nodes. |
| 180 K/W thermal resistance (RthJA) | Supports stable operation at full rated power without heatsinking on standard FR-4 PCBs with minimal copper area. |
Applications
| USB 2.0 Port Protection | HDMI Interface Protection |
|---|---|
Use Scenario: Protecting D+ and D- differential pairs in embedded host controllers against ESD events during cable insertion. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between signal line and chassis ground, acting as first-line transient suppressor. Use Value: Limits voltage excursion to ≤32.4 V during ±30 kV contact discharge, preserving USB PHY integrity without signal distortion. |
Use Scenario: Safeguarding TMDS clock and data channels in set-top boxes and AV receivers exposed to user-handling ESD. IC Role / Device Role / Timing Role: Single-channel TVS diode per signal line, positioned immediately after connector to minimize inductance. Use Value: Maintains <283 pF capacitance to avoid HDMI 1.4 eye diagram degradation while meeting IEC 61000-4-2 compliance. |
| Industrial I/O Module Protection | Automotive Infotainment Display Link |
Use Scenario: Shielding RS-485/RS-232 transceiver inputs in programmable logic controllers subjected to factory-floor ESD. IC Role / Device Role / Timing Role: Standoff-rated TVS diode connected line-to-ground on each data pin, referenced to isolated system ground. Use Value: Withstands 200 W surges and operates reliably from -65 °C to +175 °C, ensuring uptime in harsh environments. |
Use Scenario: Protecting LVDS or FPD-Link II video data lanes between head unit and digital dashboard displays. IC Role / Device Role / Timing Role: Unidirectional ESD suppressor on each differential pair, leveraging AEC-Q101 qualification for automotive grade assurance. Use Value: Delivers ±30 kV ESD immunity without compromising 100+ Mbps video bandwidth due to controlled capacitance and fast response. |
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 height; 400 W (10/1000 µs); higher clamping (34.5 V at 5.8 A); 350 pF capacitance. | Less suitable for ultra-thin designs; better for higher-energy surges where board space allows larger package. | Select SMAJ20A-E3/57T only if surge energy exceeds 200 W and board height ≥3.5 mm is acceptable. |
| TPD2E001DRYR | 0.65 mm × 0.65 mm DSBGA; dual-channel; 5.5 V VRWM; 12 pF capacitance; integrated ESD array for high-speed buses. | Designed for USB 3.0/MIPI; not rated for 20 V standoff or AEC-Q101; requires different layout and biasing. | Choose TPD2E001DRYR only for low-capacitance, multi-line protection below 6 V; not a functional substitute for SMF20A-HE3_A18's voltage rating or ruggedness. |
Compared with SMAJ20A-E3/57T and TPD2E001DRYR, SMF20A-HE3_A18 uniquely combines 20 V standoff, AEC-Q101 qualification, 1.08 mm height, and ±30 kV ESD rating in a single-channel discrete package - making it optimal for space-constrained automotive and industrial 18–20 V signal line protection where reliability and compactness are jointly critical.
Availability
SMF20A-HE3_A18 is available at Aetrix Electronics and suitable for USB 2.0 port protection, industrial I/O module safeguarding, and automotive infotainment display link applications requiring stable component supply and long-lifecycle support.
Supply support for SMF20A-HE3_A18 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 AEC-Q101 qualification, low-profile packaging, and precise clamping performance - engineered specifically for ESD-critical data lines in demanding environments.
FAQ
What is the standoff voltage of SMF20A-HE3_A18, and how does it affect circuit design?
The SMF20A-HE3_A18 has a maximum standoff voltage (VRWM) of 20 V, meaning it remains non-conductive up to this DC or continuous AC voltage level. This allows safe integration into 18 V nominal systems like industrial 24 V rails with 20 % tolerance, preventing false triggering while ensuring clamping initiates promptly above operational voltage. Designers must verify that normal signal swing stays below 20 V to avoid leakage or premature conduction.
Is SMF20A-HE3_A18 qualified for automotive applications?
Yes, SMF20A-HE3_A18 is AEC-Q101 qualified, having passed stress tests including temperature cycling, humidity bias, and human body model ESD (>8 kV). Its -65 °C to +175 °C operating range and DO-219AB package stability make it suitable for under-dash infotainment, body control modules, and ADAS sensor interfaces where environmental resilience is mandatory.
What is the clamping voltage of SMF20A-HE3_A18 at its rated peak pulse current?
At 6.2 A peak pulse current (10/1000 µs waveform), the SMF20A-HE3_A18 clamps to a maximum of 32.4 V. This value defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs with 3.3 V or 5 V I/O tolerances remain within safe operating margins without latch-up or damage.
Can SMF20A-HE3_A18 be used in high-speed data lines like USB 2.0?
Yes, SMF20A-HE3_A18 is commonly deployed on USB 2.0 D+ and D- lines due to its 283 pF junction capacitance at 0 V and sub-nanosecond response time. While not suitable for USB 3.x (which requires <2 pF), its capacitance preserves signal integrity up to 480 Mbps, and its ±30 kV ESD rating meets USB-IF compliance requirements for host and peripheral ports.
What package type does SMF20A-HE3_A18 use, and is it compatible with standard pick-and-place equipment?
SMF20A-HE3_A18 uses the DO-219AB (SMF) package - a 3.9 mm × 1.9 mm × 1.08 mm low-profile outline with cathode marking. It is fully compatible with standard SMT assembly processes, including wave and reflow soldering (peak temp ≤260 °C), and fits JEDEC-compliant feeders for automated placement. Its footprint aligns with SOD-123W, enabling drop-in replacement in many existing designs.
SMF20A-HE3_A18 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):
- 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:
- -
- Capacitance @ Frequency:
- 283pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF20A-HE3_A18 FAQ
1.How can I place an order for SMF20A-HE3_A18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF20A-HE3_A18 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-HE3_A18 reliable?
The price and inventory of SMF20A-HE3_A18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF20A-HE3_A18 is usually 5 days.
3.What payment methods are accepted for SMF20A-HE3_A18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF20A-HE3_A18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF20A-HE3_A18?
SMF20A-HE3_A18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF20A-HE3_A18 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-HE3_A18?
For technical support, including SMF20A-HE3_A18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF20A-HE3_A18 requirements.
6.How does Aetrix verify that SMF20A-HE3_A18 is sourced from the original manufacturer or authorized distributors?
All SMF20A-HE3_A18 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-HE3_A18 meets industry standards.
7.What is the process for return or replacement of SMF20A-HE3_A18?
All SMF20A-HE3_A18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF20A-HE3_A18, 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-HE3_A18 part is unused and in its original packaging.
Return procedure for SMF20A-HE3_A18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF20A-HE3_A18 Tags
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