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Vishay General Semiconductor - Diodes Division SMF20A-HE3-08
- Part No.:
- SMF20A-HE3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF20A-HE3-08.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,179
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Product details
Overview
SMF20A-HE3-08 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for transient voltage suppression on signal and power 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, ±30 kV IEC 61000-4-2 ESD immunity, and 200 W peak pulse power (10/1000 μs). It is widely used in USB, HDMI, and automotive infotainment interfaces.
For engineers reviewing the SMF20A-HE3-08 datasheet, SMF20A-HE3-08 pinout, SMF20A-HE3-08 application, or SMF20A-HE3-08 equivalent, key selection criteria include clamping voltage vs. surge current, capacitance (283 pF at 0 V), AEC-Q101 qualification status, SOD-123W-compatible footprint, and low-profile 1.08 mm height for space-constrained PCB layouts.
Technical Context
This device operates as a single-channel unidirectional TVS diode with avalanche breakdown behavior, optimized for fast response to electrostatic discharge events. Its low incremental surge resistance ensures minimal voltage overshoot during transient events, while its "Low Noise" technology enables sub-nanosecond response time critical for high-speed data line protection.
The SMF20A-HE3-08 is rated for operation across -65 °C to +175 °C, supports wave and reflow soldering per J-STD-020 MSL level 1, and meets AEC-Q101 stress test requirements including human body model >8 kV (Class H3B), making it suitable for under-hood automotive electronics and industrial control modules where thermal and mechanical robustness are essential.
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 supply or signal rails. |
| Breakdown Voltage (VBR) | 22.2–24.6 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering above system operating voltage with margin. |
| Clamping Voltage (VC) | 32.4 V at 6.2 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge; limits downstream IC stress. |
| Capacitance (CD) | 283 pF at 0 V, 1 MHz - Measured junction capacitance; impacts signal integrity on high-speed lines like USB 2.0 or CAN FD. |
| ESD Rating | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - Full compliance with Level 4 ESD immunity for end-equipment certification. |
| Peak Pulse Power | 200 W (10/1000 μs) - Sustained energy-handling capability for repetitive transients in industrial environments. |
| Operating Temp Range | -65 °C to +175 °C - Enables deployment in engine control units, battery management systems, and outdoor telecom equipment. |
Pinout & Package
SMF20A-HE3-08 uses the DO-219AB (SMF) package: low-profile (1.08 mm max height), 3.9 mm × 1.9 mm footprint, cathode-bar marked, compatible with SOD-123W, SOD-123F, and SOD-123FL land patterns. Weight: 15 mg. Flammability: UL 94 V-0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side terminal | Connected to protected signal or power line; conducts surge current toward cathode during overvoltage event. |
| Cathode | Ground/reference terminal | Connected to system ground or low-impedance return path; establishes clamping reference and defines unidirectional polarity. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables robust protection against multiple EFT bursts without degradation in industrial PLC I/O modules. |
| ±30 kV IEC 61000-4-2 ESD immunity | Meets highest severity level for touch-point protection in automotive center consoles and medical handheld devices. |
| AEC-Q101 qualified variant available | Supports automotive-grade reliability validation for powertrain and ADAS sensor interface circuits. |
| Low-profile DO-219AB package | Reduces board space and improves thermal coupling to copper pads, lowering RthJA to 180 K/W on standard FR-4. |
| "Low Noise" fast-response technology | Sub-1 ns response time minimizes voltage overshoot on high-speed serial links such as LVDS or MIPI D-PHY. |
Applications
| Automotive Infotainment | Industrial USB Host Port |
|---|---|
Use Scenario: Protecting HDMI and USB 2.0 lines in head unit displays exposed to ESD during user interaction and assembly handling. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed directly at connector entry point to clamp transients before reaching SoC or level-shifter ICs. Use Value: 283 pF capacitance avoids signal rise-time degradation on 480 Mbps USB lines; ±30 kV rating satisfies ISO 10605 and IEC 61000-4-2 compliance testing. | Use Scenario: Safeguarding USB host controller ports on programmable logic controllers (PLCs) subject to field technician ESD events and cable-induced surges. IC Role / Device Role / Timing Role: Primary front-end transient suppressor on VBUS and D+/D- lines, coordinated with internal port controller ESD structures. Use Value: 32.4 V clamping voltage prevents latch-up in 3.3 V USB PHYs; 200 W pulse rating handles repeated 10/1000 μs surges in factory-floor environments. |
| Automotive Body Control Module | Medical Patient Monitor Interface |
Use Scenario: Protecting LIN bus and sensor input lines (e.g., ambient light, temperature) in BCMs mounted near vehicle doors and dashboards. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V supply rails and analog sensor inputs to absorb load-dump and ESD pulses. Use Value: -65 °C to +175 °C operating range ensures functionality across engine bay thermal cycles; AEC-Q101 qualification confirms long-term reliability. | Use Scenario: Shielding ECG electrode inputs and touchscreen controller lines in portable patient monitors subjected to clinical ESD and defibrillation recovery transients. IC Role / Device Role / Timing Role: Low-capacitance unidirectional clamp on high-impedance analog front-end paths to preserve signal-to-noise ratio. Use Value: 283 pF capacitance maintains >100 dB CMRR at 60 Hz; 22.2–24.6 V VBR allows use with 24 V isolated supply rails common in medical isolation barriers. |
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 at 5.9 A), larger SMA package (4.5 mm × 2.7 mm), 400 W peak power (10/1000 μs). | Better suited for higher-energy surges but less space-efficient; not AEC-Q101 qualified in standard grade. | Select when surge energy exceeds 200 W and board area permits larger footprint. |
| TPD2E001DRYR | Lower capacitance (11 pF), dual-channel, 5 V VRWM, integrated ESD array; not rated for 20 V operation or automotive temp range. | Designed for high-speed digital interfaces (USB, HDMI) with tight capacitance budgets; lacks high-voltage standoff and extended temperature support. | Choose only for low-voltage (<6 V), high-frequency signal lines where <15 pF capacitance is mandatory. |
Compared with SMAJ20A-E3/57T and TPD2E001DRYR, SMF20A-HE3-08 delivers optimal balance of compact DO-219AB size, 20 V standoff, 283 pF capacitance, and AEC-Q101 readiness-making it the preferred choice for automotive and industrial 12–24 V interface protection where board space and reliability are constrained.
Availability
SMF20A-HE3-08 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial USB host ports, and medical patient monitor interfaces requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMF20A-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 Intertechnology is a global semiconductor manufacturer specializing in discrete components, sensors, and passive elements, with leadership in power management, signal conditioning, and protection technologies.
The SMF series is part of Vishay's eSMP® family, engineered specifically for high-reliability ESD and surge protection in automotive, industrial, and medical applications where small size, high surge capability, and AEC-Q101 compliance are required.
FAQ
What is the clamping voltage of SMF20A-HE3-08 at its rated peak pulse current?
The SMF20A-HE3-08 has a maximum clamping voltage (VC) of 32.4 V at 6.2 A peak pulse current with a 10/1000 μs waveform. This value is measured under standardized surge conditions and defines the upper voltage limit imposed on protected circuitry during transient events. The clamping performance is guaranteed across the full operating temperature range of -65 °C to +175 °C, ensuring consistent protection in harsh environments where SMF20A-HE3-08 is deployed.
Is SMF20A-HE3-08 AEC-Q101 qualified?
The SMF20A-HE3-08 is offered in an AEC-Q101 qualified version (e.g., SMF20A-HE3_A08), confirmed in Vishay's ordering matrix and qualification reports. Standard SMF20A-HE3-08 may be non-automotive grade unless explicitly ordered with the "_A" suffix. Engineers must verify the full part number suffix and consult Vishay's official AEC-Q101 certificate to confirm qualification status for automotive applications where SMF20A-HE3-08 is intended for use.
What is the junction capacitance of SMF20A-HE3-08 and how does it affect high-speed signal lines?
The SMF20A-HE3-08 exhibits a typical junction capacitance of 283 pF at 0 V and 1 MHz. This value directly impacts signal integrity on high-speed lines: for USB 2.0 (480 Mbps), it introduces measurable rise-time degradation but remains within acceptable limits for short traces (<10 cm) with proper layout. It is not recommended for USB 3.0 or HDMI 2.0 due to excessive loading; SMF20A-HE3-08 is best applied on lower-speed interfaces or power rails where capacitance is less critical.
How does the DO-219AB package of SMF20A-HE3-08 compare to SOD-123W in PCB layout?
The DO-219AB package used by SMF20A-HE3-08 is mechanically compatible with SOD-123W footprints per Vishay's documentation, sharing identical pad dimensions (2.9 mm × 1.4 mm), cathode marking orientation, and tape-and-reel orientation. Layouts designed for SOD-123W can accept SMF20A-HE3-08 without modification, though the DO-219AB's lower profile (1.08 mm vs. ~1.2 mm) improves clearance in stacked assemblies. Thermal performance is equivalent, with both achieving RthJA ≈ 180 K/W on 3 mm × 3 mm Cu pads.
What is the maximum peak pulse current SMF20A-HE3-08 can handle under IEC 61000-4-5 conditions?
Under IEC 61000-4-5 8/20 μs surge conditions, SMF20A-HE3-08 is rated for 1000 W peak pulse power, corresponding to approximately 22.4 A peak pulse current (calculated as √(1000 W ÷ 20 V)). This rating applies to single-event, non-repetitive surges and is validated per Vishay's absolute maximum ratings table. For repetitive surges, derating per duty cycle and thermal management is required; SMF20A-HE3-08 is not intended for sustained AC line protection.
SMF20A-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):
- 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 (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF20A-HE3-08 FAQ
1.How can I place an order for SMF20A-HE3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF20A-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 SMF20A-HE3-08 reliable?
The price and inventory of SMF20A-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 SMF20A-HE3-08 is usually 5 days.
3.What payment methods are accepted for SMF20A-HE3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF20A-HE3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF20A-HE3-08?
SMF20A-HE3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF20A-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 SMF20A-HE3-08?
For technical support, including SMF20A-HE3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF20A-HE3-08 requirements.
6.How does Aetrix verify that SMF20A-HE3-08 is sourced from the original manufacturer or authorized distributors?
All SMF20A-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 SMF20A-HE3-08 meets industry standards.
7.What is the process for return or replacement of SMF20A-HE3-08?
All SMF20A-HE3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF20A-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 SMF20A-HE3-08 part is unused and in its original packaging.
Return procedure for SMF20A-HE3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF20A-HE3-08 Tags
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