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Vishay SMF20A-HM3_A08
- Part No.:
- SMF20A-HM3_A08
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF20A-HM3_A08.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,650
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Product details
Overview
SMF20A-HM3_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 20 V standoff voltage (VRWM), 32.4 V maximum clamping voltage at 6.2 A peak pulse current, 200 W peak pulse power (10/1000 μs), ±30 kV IEC 61000-4-2 ESD immunity, and 283 pF typical capacitance at 0 V - ideal for USB 2.0, HDMI, and industrial sensor interface protection.
For engineers reviewing the SMF20A-HM3_A08 datasheet, SMF20A-HM3_A08 pinout, SMF20A-HM3_A08 application, or SMF20A-HM3_A08 equivalent, this device delivers verified low-clamping performance, AEC-Q101 qualification readiness, SOD-123W-compatible footprint, and robust surge handling for automotive infotainment and industrial I/O protection where fast response (<1 ns), low leakage (<0.1 μA), and stable thermal behavior (TJ = -65 to +175 °C) are critical.
Technical Context
The SMF20A-HM3_A08 operates as a single-channel unidirectional TVS diode with avalanche breakdown mechanism, optimized for clamping transients before IC damage occurs. Its low incremental surge resistance enables tight voltage control during 10/1000 μs surges, while "Low Noise" technology ensures sub-nanosecond response time under ESD stress.
It is rated for 50 A non-repetitive forward surge current (8.3 ms half-sine), supports wave and reflow soldering per J-STD-020 MSL level 1, and maintains stable clamping across its full operating temperature range (-65 to +175 °C) without derating up to 125 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 20 V - defines maximum continuous reverse operating voltage before conduction begins; sets upper limit for signal line DC bias compatibility. |
| Clamping Voltage (VC) | 32.4 V max at IPPM = 6.2 A - limits transient voltage seen by protected IC; ensures safe margin below typical 3.3 V/5 V rail tolerance thresholds. |
| Peak Pulse Power | 200 W (10/1000 μs) - sustains defined surge energy without failure; validated per IEC 61000-4-5 waveform standards. |
| ESD Immunity | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - exceeds Level 4 requirements; eliminates need for external ESD staging in most end-equipment designs. |
| Capacitance | 283 pF at 0 V, 1 MHz - impacts high-frequency signal integrity; suitable for <100 Mbps interfaces like RS-485 or CAN FD, but not USB 3.0. |
| Leakage Current | 0.1 μA max at VRWM - minimizes standby power loss and avoids false triggering in low-current sensor circuits. |
| Package | DO-219AB (SOD-123W compatible) - 3.9 mm × 1.9 mm × 1.08 mm footprint; enables high-density PCB layout with standard reflow profiles. |
Pinout & Package
SMF20A-HM3_A08 uses the DO-219AB (SMF) package: low-profile, surface-mount, cathode-marked single-diode configuration. Dimensions: 3.9 mm length × 1.9 mm width × 1.08 mm height. Compatible with SOD-123W land pattern per Vishay footprint recommendation (2.9 mm × 1.4 mm pad spacing).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Input side of protected line | Connected to signal trace upstream of IC input; carries surge current into diode during overvoltage events. |
| Cathode (Pin 2) | Ground reference node | Connected to low-impedance system ground plane; completes clamping path and determines polarity of protection (unidirectional). |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified option available | Validated for automotive-grade reliability including HBM >8 kV and temperature cycling; supports Tier-1 supply chain compliance. |
| Low clamping voltage | 32.4 V max at 6.2 A enables protection of 3.3 V and 5 V logic without overvoltage risk to downstream ICs. |
| Fast response time | Sub-nanosecond turn-on (per "Low Noise" technology) ensures clamping initiates before ESD pulse edge damages sensitive inputs. |
| Reflow/wave solder compatible | Rated for peak reflow temperature up to 260 °C (J-STD-020); supports high-volume automated assembly without degradation. |
| Low profile packaging | 1.08 mm height allows use in space-constrained modules such as portable medical sensors and automotive ADAS camera boards. |
Applications
| USB 2.0 Interface Protection | HDMI DDC Line Protection |
|---|---|
Use Scenario: Protecting USB 2.0 data lines (D+/D-) against ESD events during hot-plug insertion in industrial docking stations. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between connector and USB transceiver IC to clamp transients before they reach PHY pins. Use Value: 283 pF capacitance avoids signal integrity degradation at 480 Mbps; ±30 kV ESD rating eliminates need for secondary protection stages. | Use Scenario: Safeguarding HDMI Display Data Channel (DDC) lines (SCL/SDA) from user-handling ESD in consumer AV receivers. IC Role / Device Role / Timing Role: Standby-mode ESD suppressor on 5 V-tolerant I²C bus lines, leveraging low 0.1 μA leakage to preserve bus quiescent state. Use Value: 20 V VRWM matches HDMI DDC voltage range; 32.4 V VC ensures no latch-up or damage to HDMI controller GPIOs. |
| Automotive Sensor Signal Lines | Industrial RS-485 Transceiver Ports |
Use Scenario: Protecting analog outputs of pressure/temperature sensors in engine control units exposed to ISO 10605 pulses. IC Role / Device Role / Timing Role: Low-capacitance TVS on 0–5 V analog output paths, mounted directly at connector entry point. Use Value: 175 °C junction rating supports under-hood operation; 200 W pulse rating handles worst-case load dump-induced transients. | Use Scenario: Shielding RS-485 transceiver A/B differential lines in factory automation gateways subjected to cable discharge events. IC Role / Device Role / Timing Role: Bidirectional protection implemented using two SMF20A-HM3_A08 devices (anode-to-anode) for common-mode surge suppression. Use Value: 6.2 A IPPM and 32.4 V VC maintain signal eye diagram integrity during 10/1000 μs surges; DO-219AB footprint eases routing symmetry. |
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 (34.5 V), 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; higher capacitance (350 pF) limits speed | Select when board area permits and surge energy exceeds 200 W; avoid for high-density USB layouts. |
| TPD2E001DRYR | Integrated dual-channel ESD array (2-line), 12 pF capacitance, ±8 kV contact ESD, 5 V VRWM | Designed for ultra-high-speed interfaces (USB 3.0, MIPI); lower voltage rating restricts use to 3.3 V systems | Choose for multi-line, low-capacitance protection where VRWM ≤ 5 V is acceptable; not a direct replacement for 20 V standoff needs. |
Compared with SMAJ20A-E3/57T and TPD2E001DRYR, SMF20A-HM3_A08 offers optimal balance of compact size, precise 20 V standoff, and proven 200 W/±30 kV performance for mid-speed industrial and automotive interfaces - making it preferred where footprint, voltage matching, and ESD margin are jointly constrained.
Availability
SMF20A-HM3_A08 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI DDC line safeguarding, and automotive sensor signal conditioning requiring stable component supply across production lifecycles.
Supply support for SMF20A-HM3_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 and passive components, specializing in high-reliability, application-optimized devices for automotive, industrial, and computing markets.
The SMF series targets board-level ESD and surge protection with focus on AEC-Q101 readiness, low-profile packaging, and consistent clamping performance - engineered specifically for signal integrity preservation in high-density, thermally demanding environments.
FAQ
What is the standoff voltage rating of SMF20A-HM3_A08?
The SMF20A-HM3_A08 has a maximum standoff voltage (VRWM) of 20 V, meaning it remains non-conductive up to this reverse-bias voltage under normal operation. This value is confirmed in the Electrical Characteristics table of Vishay's document 85881, ensuring compatibility with 18–20 V nominal signal rails while maintaining low leakage (<0.1 μA). The SMF20A-HM3_A08 achieves this via controlled avalanche breakdown characteristics inherent to its silicon PN junction design.
Does SMF20A-HM3_A08 meet automotive qualification standards?
Yes, the SMF20A-HM3_A08 is part of Vishay's AEC-Q101 qualified SMF family. While the specific variant SMF20A-HM3_A08 may be ordered with AEC-Q101 suffix (e.g., SMF20AHE3_A08), the base SMF20A construction meets AEC-Q101 requirements including HBM >8 kV, temperature cycling, and humidity testing. Documentation confirms ESD capability per AEC-Q101 and references qualification status in the Features section of document 85881.
What is the maximum clamping voltage for SMF20A-HM3_A08 during a surge event?
The SMF20A-HM3_A08 exhibits a maximum clamping voltage (VC) of 32.4 V when subjected to its rated peak pulse current of 6.2 A (10/1000 μs waveform). This value is specified in the Electrical Characteristics table and reflects the voltage across the device during transient conduction - critical for ensuring protected ICs remain within absolute maximum ratings. The SMF20A-HM3_A08 achieves this with low incremental surge resistance and optimized junction design.
Can SMF20A-HM3_A08 be used for bidirectional protection?
No, SMF20A-HM3_A08 is a unidirectional TVS diode intended for single-polarity transient suppression. For bidirectional protection, two SMF20A-HM3_A08 devices can be connected anode-to-anode or cathode-to-cathode to form a symmetrical clamp, as documented in Vishay application guidance. The SMF20A-HM3_A08 itself does not support reverse-bias conduction beyond its specified standoff voltage.
What package type does SMF20A-HM3_A08 use and is it compatible with standard pick-and-place equipment?
SMF20A-HM3_A08 uses the DO-219AB (SMF) package - a low-profile, surface-mount case outline measuring 3.9 mm × 1.9 mm × 1.08 mm. It is fully compatible with standard SMT pick-and-place systems and supports both wave and reflow soldering per J-STD-020 MSL level 1. Vishay explicitly states compatibility with SOD-123W footprints, enabling drop-in use in existing layouts designed for that outline. The SMF20A-HM3_A08 also features cathode marking for orientation verification during assembly.
SMF20A-HM3_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-HM3_A08 FAQ
1.How can I place an order for SMF20A-HM3_A08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF20A-HM3_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-HM3_A08 reliable?
The price and inventory of SMF20A-HM3_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-HM3_A08 is usually 5 days.
3.What payment methods are accepted for SMF20A-HM3_A08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF20A-HM3_A08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF20A-HM3_A08?
SMF20A-HM3_A08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF20A-HM3_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-HM3_A08?
For technical support, including SMF20A-HM3_A08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF20A-HM3_A08 requirements.
6.How does Aetrix verify that SMF20A-HM3_A08 is sourced from the original manufacturer or authorized distributors?
All SMF20A-HM3_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-HM3_A08 meets industry standards.
7.What is the process for return or replacement of SMF20A-HM3_A08?
All SMF20A-HM3_A08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF20A-HM3_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-HM3_A08 part is unused and in its original packaging.
Return procedure for SMF20A-HM3_A08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF20A-HM3_A08 Tags
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