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Vishay SMF20A-HE3_A08
- Part No.:
- SMF20A-HE3_A08
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF20A-HE3_A08.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,733
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Product details
Overview
SMF20A-HE3_A08 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for low-capacitance transient 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 capacitance at 1 MHz - enabling robust IEC 61000-4-2 ±30 kV contact/air ESD protection in USB 2.0, HDMI, and industrial sensor interfaces.
For engineers reviewing the SMF20A-HE3_A08 datasheet, SMF20A-HE3_A08 pinout, SMF20A-HE3_A08 application, or SMF20A-HE3_A08 equivalent, this device is selected for high-reliability ESD hardening of 20 V-rated signal paths where low clamping voltage, AEC-Q101 qualification, and SOD-123W-compatible footprint are critical design requirements.
Technical Context
This unidirectional TVS diode operates as a shunt-type transient suppressor, conducting only when reverse voltage exceeds its breakdown threshold to clamp fast-rising ESD transients. Its low incremental surge resistance ensures minimal voltage overshoot during 10/1000 μs pulses, while "Low Noise" technology delivers sub-nanosecond response time for compliance with IEC 61000-4-2.
The device is qualified per AEC-Q101 for automotive applications and supports wave/reflow soldering per J-STD-020 MSL level 1. Its DO-219AB package provides 1.08 mm height and 3.9 × 1.9 mm footprint - compatible with SOD-123W, SOD-123F, and SOD-123FL land patterns without layout change.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 20 V - defines maximum continuous operating voltage before conduction begins; sets upper limit for protected signal swing. |
| Breakdown Voltage (VBR) | 22.2–24.6 V at 1 mA - ensures reliable triggering above normal operating range while avoiding false trips. |
| Clamping Voltage (VC) | 32.4 V at 6.2 A (10/1000 μs) - limits transient-induced stress on downstream ICs during ESD events. |
| Peak Pulse Power (PPP) | 200 W (10/1000 μs) - sustains single high-energy surges without degradation; sufficient for IEC 61000-4-2 Level 4. |
| Capacitance (CD) | 283 pF at 0 V, 1 MHz - balances ESD robustness and signal integrity for <100 Mbps digital interfaces. |
| ESD Rating | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - exceeds industrial and automotive ESD immunity requirements. |
| AEC-Q101 Qualified | Yes - validated for automotive underhood and infotainment systems requiring extended temperature operation (-65 °C to +175 °C). |
Pinout & Package
The SMF20A-HE3_A08 uses the DO-219AB (SMF) package: 3.9 mm × 1.9 mm × 1.08 mm, low-profile surface-mount case with cathode band marking. Compatible with SOD-123W footprint and reflow-solderable per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Signal path input (protected side) | Connected to line under protection; conducts transient current toward cathode during overvoltage. |
| Cathode | Reference node (ground or supply rail) | Connected to system ground or VCC; establishes clamping reference and enables unidirectional operation. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables single-event ESD suppression without thermal runaway in compact PCB layouts. |
| ±30 kV IEC 61000-4-2 ESD immunity | Meets highest industrial and automotive ESD test levels without external circuitry. |
| AEC-Q101 qualification | Validates reliability for automotive electronics including ADAS sensors and body control modules. |
| 283 pF capacitance at 1 MHz | Preserves signal rise/fall times in USB 2.0 and RS-485 links without excessive jitter or attenuation. |
| SOD-123W footprint compatibility | Allows drop-in replacement or shared PCB land pattern across Vishay's SMF and legacy SOD-123 families. |
Applications
| USB 2.0 Interface Protection | HDMI Signal Line Hardening |
|---|---|
|
Use Scenario: Protecting D+ and D− differential pairs in embedded host/device ports against user-handling ESD. IC Role / Device Role / Timing Role: Unidirectional shunt TVS diode placed directly at connector entry point. Use Value: Clamps transients to ≤32.4 V within nanoseconds, preventing latch-up or damage to USB PHY transceivers rated for 3.3 V operation. |
Use Scenario: Safeguarding TMDS clock and data channels in industrial displays and media players. IC Role / Device Role / Timing Role: Low-capacitance ESD suppressor mounted adjacent to HDMI receptacle pins. Use Value: 283 pF capacitance avoids signal integrity degradation at 2.25 Gbps, while ±30 kV ESD rating covers factory and field handling. |
| Automotive Sensor Signal Conditioning | Industrial RS-485 Transceiver Input Protection |
|
Use Scenario: Shielding analog outputs of pressure/temperature sensors in engine control units. IC Role / Device Role / Timing Role: Standoff-rated TVS on 0–5 V sensor output lines referenced to chassis ground. Use Value: 20 V VRWM aligns with 5 V sensor supply rails; AEC-Q101 qualification ensures operation at 175 °C junction temperature. |
Use Scenario: Guarding half-duplex RS-485 bus lines (A/B) in factory automation controllers. IC Role / Device Role / Timing Role: Bidirectional protection implemented using two unidirectional SMF20A-HE3_A08 devices back-to-back. Use Value: 32.4 V clamping prevents receiver input overvoltage during lightning-induced surges up to 200 W peak power. |
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 × 4.3 mm × 2.3 mm; 38.9 V clamping at 5.1 A; 350 pF capacitance. | Higher clamping voltage and capacitance; better suited for lower-speed, higher-power surge environments. | Select SMAJ20A-E3/57T when board space allows larger package and higher energy handling is prioritized over signal integrity. |
| TPD2E001DRYR | Monolithic dual-channel ESD array in SOT-553; 15 pF per channel; 12 V VRWM; integrated 5 V DC blocking. | Designed for ultra-high-speed interfaces (USB 3.0, MIPI); not AEC-Q101 qualified; lower power rating (120 W). | Choose TPD2E001DRYR for space-constrained, high-frequency designs where sub-20 pF capacitance is mandatory and automotive qualification is not required. |
Compared with SMAJ20A-E3/57T and TPD2E001DRYR, the SMF20A-HE3_A08 delivers optimal balance of low profile (1.08 mm height), AEC-Q101 compliance, and 283 pF capacitance - making it preferred for automotive and industrial signal-line protection where footprint, reliability, and moderate-speed interface integrity are jointly critical.
Availability
SMF20A-HE3_A08 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, automotive sensor signal conditioning, and industrial RS-485 transceiver input protection requiring stable component supply and long-term lifecycle support.
Supply support for SMF20A-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 Intertechnology is a global semiconductor manufacturer specializing in discrete components, passive elements, and sensors for industrial, automotive, and computing applications.
The SMF series targets high-reliability ESD protection in space-constrained, thermally demanding environments - engineered specifically for automotive-grade signal-line hardening and industrial interface robustness.
FAQ
What is the maximum clamping voltage of the SMF20A-HE3_A08 under standard IEC 61000-4-2 ESD conditions?
The SMF20A-HE3_A08 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 circuits during ESD events - ensuring compatibility with 3.3 V and 5 V logic interfaces. The SMF20A-HE3_A08 maintains this clamping performance across its full operating temperature range.
Is the SMF20A-HE3_A08 suitable for automotive applications?
Yes, the SMF20A-HE3_A08 is AEC-Q101 qualified and rated for operation from -65 °C to +175 °C junction temperature. Its DO-219AB package, robust ESD immunity (±30 kV contact/air), and stable clamping behavior make it appropriate for automotive use cases including sensor signal lines, infotainment interfaces, and body electronics. The SMF20A-HE3_A08 meets the reliability and environmental stress requirements defined in the AEC-Q101 standard.
What is the capacitance of the SMF20A-HE3_A08 and how does it affect high-speed signal integrity?
The SMF20A-HE3_A08 exhibits 283 pF typical capacitance at 0 V and 1 MHz. This value represents the total junction capacitance seen by the protected signal line and directly impacts rise/fall times and bandwidth. At 283 pF, the SMF20A-HE3_A08 is optimized for interfaces up to ~100 Mbps (e.g., USB 2.0, RS-485); higher-speed links like USB 3.0 require lower-capacitance alternatives. The SMF20A-HE3_A08 balances ESD robustness with acceptable signal fidelity for medium-speed applications.
Does the SMF20A-HE3_A08 have a unidirectional or bidirectional configuration?
The SMF20A-HE3_A08 is a unidirectional TVS diode, meaning it conducts only in reverse bias - from cathode to anode - when voltage exceeds its breakdown threshold. It is intended for use with signals referenced to ground or positive supply. For bidirectional protection (e.g., AC-coupled or differential lines), two SMF20A-HE3_A08 devices can be connected in series opposition. The SMF20A-HE3_A08 marking code "BV" and cathode band confirm its unidirectional polarity.
What packaging and soldering standards does the SMF20A-HE3_A08 support?
The SMF20A-HE3_A08 uses the DO-219AB (SMF) package and is fully compatible with standard SMD reflow processes per JEDEC J-STD-020, including peak temperatures up to 260 °C. It is rated MSL level 1 (unlimited floor life) and supports both wave and reflow soldering. The SMF20A-HE3_A08 is supplied on 7" or 13" reels with 3K or 10K quantities, respectively, and features RoHS-compliant, lead-free tin terminations.
SMF20A-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):
- 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_A08 FAQ
1.How can I place an order for SMF20A-HE3_A08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF20A-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 SMF20A-HE3_A08 reliable?
The price and inventory of SMF20A-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 SMF20A-HE3_A08 is usually 5 days.
3.What payment methods are accepted for SMF20A-HE3_A08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF20A-HE3_A08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF20A-HE3_A08?
SMF20A-HE3_A08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF20A-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 SMF20A-HE3_A08?
For technical support, including SMF20A-HE3_A08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF20A-HE3_A08 requirements.
6.How does Aetrix verify that SMF20A-HE3_A08 is sourced from the original manufacturer or authorized distributors?
All SMF20A-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 SMF20A-HE3_A08 meets industry standards.
7.What is the process for return or replacement of SMF20A-HE3_A08?
All SMF20A-HE3_A08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF20A-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 SMF20A-HE3_A08 part is unused and in its original packaging.
Return procedure for SMF20A-HE3_A08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF20A-HE3_A08 Tags
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