My Inquiry
My Account
Vishay SMF20A-HM3_A18
- Part No.:
- SMF20A-HM3_A18
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF20A-HM3_A18.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,977
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMF20A-HM3_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 200 W peak pulse power (10/1000 μs). It delivers ±30 kV IEC 61000-4-2 ESD immunity and supports automotive-grade reliability per AEC-Q101.
For engineers reviewing the SMF20A-HM3_A18 datasheet, SMF20A-HM3_A18 pinout, SMF20A-HM3_A18 application, or SMF20A-HM3_A18 equivalent, this device is selected for robust, low-capacitance (283 pF @ 0 V, 1 MHz) overvoltage protection in USB 2.0, HDMI, and automotive infotainment interfaces where fast response, low clamping, and space-constrained SOD-123W-compatible footprints are critical.
Technical Context
This diode operates as a unidirectional TVS element with cathode-anode polarity, leveraging silicon avalanche technology to clamp transients before downstream ICs sustain damage. Its low incremental surge resistance ensures minimal voltage overshoot during 10/1000 μs surges, while its "Low Noise" design enables sub-nanosecond response time-critical for protecting high-bandwidth signal paths.
The SMF20A-HM3_A18 is rated for continuous operation from –65 °C to +175 °C, with thermal resistance RthJA = 180 K/W on standard 3 mm × 3 mm Cu pads. It meets AEC-Q101 stress testing for human body model (>8 kV H3B), making it suitable for under-hood and dashboard electronics where thermal cycling and mechanical shock tolerance are required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 20 V - Maximum continuous reverse operating voltage before leakage exceeds 0.1 μA; defines safe operating margin below clamping threshold. |
| Reverse Breakdown (VBR) | 22.2–24.6 V @ 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during ESD events without premature conduction. |
| Clamping Voltage (VC) | 32.4 V @ 6.2 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge; enables safe margin for 24 V automotive systems. |
| Peak Pulse Power | 200 W (10/1000 μs) - Sustains transient energy without degradation; sufficient for IEC 61000-4-5 Level 2 surges. |
| Capacitance | 283 pF @ 0 V, 1 MHz - Low enough for USB 2.0 (480 Mbps) signal integrity; avoids excessive rise-time degradation. |
| ESD Immunity | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - Exceeds industrial and automotive ESD test requirements for front-panel and connector interfaces. |
| Package | DO-219AB (SOD-123W-compatible) - 3.9 mm × 1.9 mm × 1.08 mm low-profile footprint; supports automated reflow and wave soldering. |
Pinout & Package
SMF20A-HM3_A18 uses the DO-219AB (SOD-123W-equivalent) surface-mount package with two terminals: anode and cathode. The cathode is marked by a bar on the device body. This package is compatible with standard SOD-123W PCB footprints and supports high-density layout in space-constrained applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side terminal | Connected to protected signal line or power rail; conducts surge current toward ground when cathode is held at reference potential. |
| Cathode | Reference/Ground side terminal | Connected to system ground or low-impedance return path; establishes clamping reference and enables unidirectional protection behavior. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables reliable suppression of repetitive ESD and lightning-induced surges in industrial control I/O without derating. |
| ±30 kV IEC 61000-4-2 ESD immunity | Meets highest severity level for connector-level ESD testing-eliminates need for secondary protection stages. |
| AEC-Q101 qualified | Validated for automotive under-hood and cabin modules requiring extended temperature operation and long-term reliability. |
| 283 pF capacitance @ 0 V | Preserves signal edge rate in USB 2.0 and CAN FD interfaces; avoids jitter or bit-error-rate degradation. |
| Low-profile DO-219AB package | Reduces board area by ~30% vs. SMA packages; improves thermal coupling to copper pour for enhanced power dissipation. |
Applications
| USB 2.0 Data Lines | HDMI Interface Protection |
|---|---|
Use Scenario: Protecting D+ and D− pins of USB 2.0 ports against ESD events during hot-plug insertion in automotive head units and industrial HMIs. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between signal line and chassis ground to clamp transients before reaching USB transceiver IC. Use Value: 283 pF capacitance prevents signal integrity loss at 480 Mbps; 32.4 V clamping ensures safe margin below transceiver's absolute maximum rating (typically 3.6 V IO, but 20 V bus-side tolerance). | Use Scenario: Safeguarding TMDS clock and data channels in automotive infotainment displays exposed to ESD via external HDMI connectors. IC Role / Device Role / Timing Role: Line-to-ground transient suppressor on each TMDS differential pair, leveraging low capacitance to avoid skew between channels. Use Value: Sub-1 ns response time prevents overshoot propagation into HDMI PHY; DO-219AB footprint allows placement within tight 0.5 mm pitch routing constraints. |
| Automotive LIN Bus Nodes | Industrial Sensor Signal Conditioning |
Use Scenario: Protecting LIN transceiver inputs in body control modules subjected to load dump and ESD in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Unidirectional clamping device connected between LIN bus line and ground, referenced to local node ground plane. Use Value: 20 V VRWM aligns with LIN bus nominal 12 V ±40% operating range; 175 °C max junction temperature supports under-dash mounting near heat sources. | Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop or 0–10 V sensor outputs) in factory automation PLC I/O modules from field wiring surges. IC Role / Device Role / Timing Role: Primary overvoltage protector on signal output path, placed immediately after DAC or op-amp driver stage. Use Value: 32.4 V clamping voltage provides safety margin above 24 V supply rails; AEC-Q101 qualification ensures long-term stability in vibration-prone environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A-E3/57T | Higher clamping voltage (34.4 V @ 5.8 A); larger SMA package (4.5 mm × 2.7 mm); 350 pF capacitance. | Less suitable for high-speed data lines due to higher capacitance and slower response; better for power rail protection. | Select SMAJ20A-E3/57T only when board space permits larger footprint and signal bandwidth is ≤10 MHz. |
| TPD2E001DRYR | Bi-directional dual-channel array; 15 pF typical capacitance; lower 24 V standoff; not AEC-Q101 qualified. | Optimized for ultra-high-speed USB 2.0 or MIPI lanes; lacks automotive qualification and single-line surge handling capability. | Choose TPD2E001DRYR for portable consumer devices with strict capacitance limits, not for automotive or industrial environments requiring AEC-Q101 compliance. |
Compared with SMAJ20A-E3/57T and TPD2E001DRYR, SMF20A-HM3_A18 uniquely balances low capacitance (283 pF), AEC-Q101 qualification, and compact DO-219AB packaging-making it the preferred choice for automotive signal-line protection where size, reliability, and speed must coexist.
Availability
SMF20A-HM3_A18 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial USB/HDMI interface modules, and LIN bus node designs requiring stable component supply across multi-year production cycles.
Supply support for SMF20A-HM3_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 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, surface-mount ESD and surge protection in automotive, industrial, and communications equipment where space, thermal performance, and AEC-Q101 compliance are mandatory.
FAQ
What is the maximum clamping voltage of SMF20A-HM3_A18 under a 10/1000 μs surge?
The SMF20A-HM3_A18 has a maximum clamping voltage (VC) of 32.4 V when subjected to a 6.2 A peak pulse current with a 10/1000 μs waveform. This value is measured per the conditions specified in the Vishay SMF5V0A–SMF58A datasheet Rev. 2.4 and represents the upper limit of voltage seen by the protected circuit during standardized surge events. The SMF20A-HM3_A18 maintains this clamping performance across its full operating temperature range.
Is SMF20A-HM3_A18 qualified to AEC-Q101 standards?
Yes, SMF20A-HM3_A18 is AEC-Q101 qualified, as confirmed in the Vishay SMF5V0A–SMF58A datasheet Rev. 2.4. It passes all required stress tests including human body model (HBM) Class H3B (>8 kV), temperature cycling, and high-temperature operating life. This qualification makes the SMF20A-HM3_A18 suitable for automotive applications such as body control modules, infotainment interfaces, and LIN bus nodes where component reliability under harsh environmental conditions is essential.
What is the capacitance of SMF20A-HM3_A18 at zero bias and 1 MHz?
The typical junction capacitance of SMF20A-HM3_A18 is 283 pF when measured at 0 V reverse bias and 1 MHz frequency, as published in the Electrical Characteristics table of the Vishay datasheet. This value is critical for high-speed signal line protection, enabling use in USB 2.0 and HDMI applications without significant signal distortion. The SMF20A-HM3_A18 capacitance decreases with increasing reverse voltage, supporting stable performance across varying operating conditions.
Does SMF20A-HM3_A18 support reflow soldering?
Yes, SMF20A-HM3_A18 is fully compatible with standard lead-free reflow soldering processes, with a peak temperature rating of up to 260 °C per J-STD-020 MSL Level 1 guidelines. Its DO-219AB package is optimized for both reflow and wave soldering, and the device's moisture sensitivity level (MSL 1) means it can be stored indefinitely at ambient conditions without baking prior to assembly. This simplifies manufacturing flow for the SMF20A-HM3_A18 in high-volume SMT production.
What is the standoff voltage (VRWM) rating for SMF20A-HM3_A18?
The standoff voltage (VRWM) for SMF20A-HM3_A18 is 20 V, defined as the maximum DC or continuous reverse working voltage at which leakage current remains ≤0.1 μA. This rating ensures the SMF20A-HM3_A18 remains non-conductive during normal operation while providing a clear margin below its 22.2–24.6 V breakdown range, making it ideal for protecting 24 V automotive signal lines and industrial I/O circuits where stable, low-leakage operation is required.
SMF20A-HM3_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-HM3_A18 FAQ
1.How can I place an order for SMF20A-HM3_A18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF20A-HM3_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-HM3_A18 reliable?
The price and inventory of SMF20A-HM3_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-HM3_A18 is usually 5 days.
3.What payment methods are accepted for SMF20A-HM3_A18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF20A-HM3_A18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF20A-HM3_A18?
SMF20A-HM3_A18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF20A-HM3_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-HM3_A18?
For technical support, including SMF20A-HM3_A18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF20A-HM3_A18 requirements.
6.How does Aetrix verify that SMF20A-HM3_A18 is sourced from the original manufacturer or authorized distributors?
All SMF20A-HM3_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-HM3_A18 meets industry standards.
7.What is the process for return or replacement of SMF20A-HM3_A18?
All SMF20A-HM3_A18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF20A-HM3_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-HM3_A18 part is unused and in its original packaging.
Return procedure for SMF20A-HM3_A18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF20A-HM3_A18 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
