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Vishay General Semiconductor - Diodes Division SMF20A-HM3-18
- Part No.:
- SMF20A-HM3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF20A-HM3-18.pdf
- Description:
- TVS DIODE 20VWM 32.4VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:4,878
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Product details
Overview
SMF20A-HM3-18 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 stand-off voltage (VRWM), 22.2 V minimum breakdown voltage (VBR), 32.4 V maximum clamping voltage at 6.2 A peak pulse current, 200 W peak pulse power (10/1000 μs), 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-HM3-18 datasheet, SMF20A-HM3-18 pinout, SMF20A-HM3-18 application, or SMF20A-HM3-18 equivalent, this device delivers verified ±30 kV IEC 61000-4-2 ESD immunity, AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.45), and SOD-123W-compatible footprint - critical for automotive infotainment, industrial HMI, and ruggedized communication interfaces requiring robust, low-capacitance surge protection.
Technical Context
The SMF20A-HM3-18 operates as a single-channel unidirectional TVS diode with avalanche breakdown behavior, enabling fast response (<1 ns) to ESD transients per IEC 61000-4-2. Its low incremental surge resistance ensures minimal voltage overshoot during 6.2 A IPPM pulses, while its 283 pF capacitance at 0 V maintains signal integrity on 480 Mbps USB 2.0 lines without excessive rise-time degradation.
Designed for reflow and wave soldering, it complies with MSL level 1 per J-STD-020 and supports peak temperatures up to 260 °C. The DO-219AB package provides 1.08 mm height and 3.9 mm × 1.9 mm footprint - enabling dense PCB layouts in space-constrained automotive and industrial modules where thermal resistance (RthJA = 180 K/W) and junction temperature limits (TJ = 175 °C) must be tightly managed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 20 V - defines maximum continuous operating voltage before leakage exceeds 0.1 µA; sets safe margin below system rail in 18–24 V industrial bus applications. |
| Breakdown Voltage (VBR) | 22.2–24.6 V at 1 mA - ensures reliable triggering above normal operating voltage while avoiding false trips during supply ripple or noise. |
| Clamping Voltage (VC) | 32.4 V max at 6.2 A (10/1000 µs) - limits downstream IC stress to safe levels during surge events; clamping ratio of ~1.45 enables effective protection without overdesign. |
| Junction Capacitance (CD) | 283 pF at 0 V, 1 MHz - compatible with USB 2.0 full-speed signaling (480 Mbps); low enough to avoid signal distortion but higher than RF-grade ESD devices. |
| ESD Immunity | ±30 kV contact & air discharge (IEC 61000-4-2) - exceeds automotive and industrial immunity requirements; validated across 10 pulses without parameter shift. |
| Peak Pulse Power | 200 W (10/1000 µs), 1000 W (8/20 µs) - handles both ESD and lightning-induced surges per IEC 61000-4-5; sufficient for Level 3/4 industrial port protection. |
| AEC-Q101 Qualified | Yes - qualified for automotive underhood and infotainment applications; includes H3B-class HBM (>8 kV) and full temperature cycling validation. |
Pinout & Package
The SMF20A-HM3-18 uses the DO-219AB (SMF) package: low-profile (1.08 mm height), 3.9 mm × 1.9 mm body, cathode-bar marked, compatible with SOD-123W footprint. It is a two-terminal unidirectional device with anode and cathode leads aligned for standard pick-and-place placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Input/Line side connection | Connected to protected signal line (e.g., USB D+); conducts during reverse-transient clamping to shunt energy to ground. |
| Cathode (Pin 2) | Ground reference terminal | Connected to system ground plane; establishes clamping reference; requires low-inductance path to maintain fast response and low VC. |
Key Features
| Feature | Design Value |
|---|---|
| Low-clamp architecture | 32.4 V max clamping at 6.2 A enables protection of 3.3 V/5 V logic without additional series impedance or voltage translators. |
| "Low Noise" fast-response technology | Sub-nanosecond response time minimizes voltage overshoot during ESD events, preserving signal fidelity on high-speed digital lines. |
| AEC-Q101 qualification | Validated for automotive use including temperature cycling (-65 °C to +175 °C), mechanical shock, and humidity testing - suitable for ADAS camera links and infotainment ports. |
| Solder-compatible packaging | DO-219AB outline supports both reflow (260 °C peak) and wave soldering; MSL level 1 eliminates bake requirements for standard production. |
| High-energy surge rating | 1000 W peak power (8/20 µs) meets IEC 61000-4-5 Level 3/4 requirements for industrial Ethernet and CAN FD interfaces. |
Applications
| USB 2.0 Port Protection | HDMI Interface Protection |
|---|---|
Use Scenario: Protecting USB 2.0 D+/D− lines in automotive head units against ESD from user interaction and cable hot-plug events. 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 avoids signal rise-time degradation at 480 Mbps; ±30 kV ESD rating exceeds ISO 10605 requirements for automotive interiors. | Use Scenario: Safeguarding HDMI TMDS channels in industrial displays exposed to electrostatic discharge during panel servicing or cable mating. IC Role / Device Role / Timing Role: Standoff-rated clamping diode on each differential pair, referenced to local ground, to suppress fast-rising ESD without affecting 165 MHz pixel clock integrity. Use Value: 32.4 V clamping voltage prevents damage to HDMI receiver inputs rated for ≤3.6 V absolute max, while low leakage (<0.1 µA) avoids DC bias shift. |
| Industrial I/O Module Protection | Automotive Infotainment Audio Line |
Use Scenario: Shielding RS-485/RS-232 signal lines in programmable logic controller (PLC) I/O modules from field-induced surges and operator ESD. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional diode (used with external pull-up/down) on each line to limit transient voltage to <35 V during 1 kV/2 kV surge tests. Use Value: 200 W (10/1000 µs) rating sustains repeated surge events in factory-floor environments; DO-219AB package withstands vibration per MIL-STD-202G. | Use Scenario: Protecting analog audio input/output lines (e.g., AUX, headphone jack) in vehicle infotainment systems from ESD during user plug/unplug operations. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS on line-level audio paths to prevent pop/noise injection and amplifier latch-up. Use Value: 283 pF capacitance introduces negligible phase shift below 20 kHz; AEC-Q101 qualification ensures reliability across -40 °C to +105 °C ambient operation. |
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), larger SMA (DO-214AC) package (4.5 mm × 2.7 mm), 350 pF capacitance. | Less suitable for high-speed USB/HDMI due to higher CD and slower response; better for lower-frequency power-line protection. | Select SMAJ20A-E3/57T only when board space allows larger footprint and signal bandwidth is <100 Mbps. |
| TPD2E001DRYR | Bi-directional dual-channel array (2×), 12 pF capacitance, 5 V VRWM, integrated 50 Ω series resistor for USB 2.0 compliance. | Designed specifically for USB 2.0 D+/D− pairs; not a direct replacement for single-line 20 V standoff applications. | Choose TPD2E001DRYR for new USB 2.0 designs requiring ultra-low capacitance and integrated termination; retain SMF20A-HM3-18 for legacy 20 V rail protection or discrete channel control. |
Compared with SMAJ20A-E3/57T and TPD2E001DRYR, the SMF20A-HM3-18 offers optimal balance of 20 V standoff, 283 pF capacitance, and DO-219AB compactness - making it preferred for space-constrained industrial I/O and automotive HDMI where moderate bandwidth and high surge tolerance coexist.
Availability
SMF20A-HM3-18 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, USB 2.0 peripheral interfaces, and HDMI display subsystems requiring stable component supply across extended product lifecycles.
Supply support for SMF20A-HM3-18 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 for next-generation automotive infotainment, industrial HMI, and ruggedized data connectivity.
FAQ
What is the maximum clamping voltage of the SMF20A-HM3-18 at its rated peak pulse current?
The SMF20A-HM3-18 has a maximum clamping voltage (VC) of 32.4 V at 6.2 A peak pulse current (10/1000 µs waveform). This value is measured under standardized surge conditions and ensures downstream ICs remain within safe voltage limits during ESD events. The clamping performance is guaranteed across the full operating temperature range (-65 °C to +175 °C), and the SMF20A-HM3-18 maintains this specification after AEC-Q101 qualification testing.
Is the SMF20A-HM3-18 suitable for USB 2.0 data line protection?
Yes, the SMF20A-HM3-18 is suitable for USB 2.0 data line protection due to its 283 pF typical junction capacitance at 0 V and sub-nanosecond response time. While not as low-capacitance as dedicated USB-optimized arrays like TPD2E001DRYR, its 283 pF value preserves signal integrity up to 480 Mbps without significant rise-time degradation. The SMF20A-HM3-18 is commonly deployed on individual D+ or D− lines in automotive head units where 20 V standoff and AEC-Q101 compliance are mandatory.
Does the SMF20A-HM3-18 meet automotive qualification standards?
Yes, the SMF20A-HM3-18 is AEC-Q101 qualified and rated for human body model (HBM) Class H3B (>8 kV). It undergoes full stress testing including temperature cycling, mechanical shock, and humidity exposure per AEC-Q101 Rev D. This qualification confirms suitability for automotive infotainment, ADAS camera links, and body control modules where reliability under harsh environmental conditions is required - and the SMF20A-HM3-18 is explicitly listed in Vishay's AEC-Q101 qualified SMF family documentation.
What is the package type and footprint compatibility of the SMF20A-HM3-18?
The SMF20A-HM3-18 uses the DO-219AB (SMF) package: 3.9 mm × 1.9 mm × 1.08 mm, with cathode bar marking and SOD-123W-compatible land pattern. Its footprint matches industry-standard SOD-123F and SOD-123FL variants, enabling drop-in layout reuse in existing designs. The low-profile design supports automated optical inspection (AOI) and is qualified for both reflow (260 °C peak) and wave soldering per J-STD-020 MSL level 1 - no baking required prior to assembly.
How does the SMF20A-HM3-18 perform under IEC 61000-4-2 ESD testing?
The SMF20A-HM3-18 delivers ±30 kV contact discharge and ±30 kV air discharge immunity per IEC 61000-4-2, validated across 10 pulses without parameter shift or functional failure. Its "Low Noise" fast-response technology ensures clamping begins within <1 ns of transient onset, minimizing overshoot. This performance is confirmed in Vishay's official SMF series datasheet (Doc. #85881, Rev. 2.4) and forms the basis for its use in industrial HMI touchscreens and automotive USB ports where repeatable ESD robustness is critical - and the SMF20A-HM3-18 consistently meets these requirements in production validation.
SMF20A-HM3-18 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-HM3-18 FAQ
1.How can I place an order for SMF20A-HM3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF20A-HM3-18 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-HM3-18 reliable?
The price and inventory of SMF20A-HM3-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF20A-HM3-18 is usually 5 days.
3.What payment methods are accepted for SMF20A-HM3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF20A-HM3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF20A-HM3-18?
SMF20A-HM3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF20A-HM3-18 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-HM3-18?
For technical support, including SMF20A-HM3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF20A-HM3-18 requirements.
6.How does Aetrix verify that SMF20A-HM3-18 is sourced from the original manufacturer or authorized distributors?
All SMF20A-HM3-18 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-HM3-18 meets industry standards.
7.What is the process for return or replacement of SMF20A-HM3-18?
All SMF20A-HM3-18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF20A-HM3-18, 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-HM3-18 part is unused and in its original packaging.
Return procedure for SMF20A-HM3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF20A-HM3-18 Tags
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