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Vishay General Semiconductor - Diodes Division SMF22A-M3-18
- Part No.:
- SMF22A-M3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF22A-M3-18.pdf
- Description:
- TVS DIODE 22VWM 35.5VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:8,819
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Product details
Overview
SMF22A-M3-18 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 and power rails. It features a 22 V stand-off voltage (VRWM), 24.4 V minimum breakdown voltage (VBR), 35.5 V maximum clamping voltage at 5.6 A peak pulse current, and 200 W peak pulse power capability per 10/1000 μs waveform - used in USB 2.0, HDMI, and automotive infotainment interfaces.
For engineers reviewing the SMF22A-M3-18 datasheet, SMF22A-M3-18 pinout, SMF22A-M3-18 application, or SMF22A-M3-18 equivalent, key selection criteria include clamping performance under IEC 61000-4-2 ±30 kV contact discharge, low 271 pF capacitance at 0 V, AEC-Q101 qualification, SOD-123W-compatible footprint, and thermal resistance of 180 K/W on standard PCB mounting.
Technical Context
This device operates as a single-channel unidirectional TVS diode with avalanche breakdown behavior, optimized for fast response to ESD transients. Its junction temperature range spans −65 °C to +175 °C, and it sustains 50 A non-repetitive forward surge current per 8.3 ms half-sine wave.
The SMF22A-M3-18 uses silicon planar technology with low incremental surge resistance to achieve tight clamping and minimal voltage overshoot during transient events. It meets IEC 61000-4-2 (±30 kV contact/air), IEC 61000-4-5 (1000 W, 8/20 μs), and AEC-Q101 Class H3B (>8 kV HBM) requirements without external biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 22 V - maximum continuous reverse operating voltage before leakage exceeds 0.1 µA |
| Breakdown Voltage (VBR) | 24.4 V min / 27 V max at 1 mA - defines reliable avalanche initiation threshold |
| Clamping Voltage (VC) | 35.5 V max at 5.6 A (10/1000 µs) - limits downstream IC voltage stress during ESD events |
| Peak Pulse Power (PPP) | 200 W at 10/1000 µs - supports robust surge handling in compact SMT layout |
| Capacitance (CD) | 271 pF at 0 V, 1 MHz - suitable for <100 Mbps signal lines with minimal signal distortion |
| ESD Rating | ±30 kV contact & air discharge per IEC 61000-4-2 - eliminates need for secondary protection stages |
| Thermal Resistance (RthJA) | 180 K/W on 3 mm × 3 mm Cu pads - enables stable operation up to +175 °C junction temperature |
Pinout & Package
SMF22A-M3-18 is housed in the DO-219AB (SMF) package: low-profile (1.08 mm height), molded epoxy case with cathode bar marking, compatible with SOD-123W/SOD-123F footprints. Dimensions: 3.9 mm × 1.9 mm × 1.08 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side connection | Connected to protected signal or power line; conducts during reverse transient |
| Cathode | Ground/reference node | Tied to system ground or low-impedance return path; establishes unidirectional clamping polarity |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMT packaging | DO-219AB footprint fits space-constrained layouts while enabling automated reflow assembly |
| "Low Noise" fast-response technology | Sub-nanosecond response time minimizes voltage overshoot during ESD strikes |
| AEC-Q101 qualification | Validated for automotive electronics including infotainment, body control, and ADAS sensor interfaces |
| Wave and reflow solderable | Compatible with standard Pb-free reflow profiles up to 260 °C peak temperature |
| UL 94 V-0 molding compound | Ensures flame-retardant reliability in safety-critical industrial and automotive enclosures |
Applications
| USB 2.0 Interface Protection | HDMI Signal Line Protection |
|---|---|
|
Use Scenario: Protecting D+ and D− differential pairs in portable USB peripherals against ESD events during hot-plug insertion. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between data line and chassis ground to clamp transients before reaching USB transceiver. Use Value: 271 pF capacitance avoids signal integrity degradation at 480 Mbps; 35.5 V clamping prevents damage to 3.3 V tolerant PHY circuitry. |
Use Scenario: Safeguarding TMDS clock and data channels in flat-panel displays and set-top boxes exposed to user-handling ESD. IC Role / Device Role / Timing Role: Standoff-rated transient suppressor mounted directly at HDMI connector pins to shunt ESD energy to ground. Use Value: 22 V VRWM ensures no conduction during normal 3.3 V TMDS swing; ±30 kV IEC 61000-4-2 rating covers worst-case human-body discharge. |
| Automotive Infotainment Display | Industrial CAN Bus Node |
|
Use Scenario: Shielding LVDS or FPD-Link video signals in automotive head units and digital instrument clusters from ESD coupling via display cables. IC Role / Device Role / Timing Role: Single-channel unidirectional suppressor on each video lane, referenced to vehicle chassis ground. Use Value: AEC-Q101 qualification confirms reliability across −40 °C to +125 °C ambient; 175 °C junction rating supports under-hood thermal margins. |
Use Scenario: Adding secondary ESD protection on CAN_H/CAN_L lines in factory automation controllers where primary transceivers lack full ±30 kV immunity. IC Role / Device Role / Timing Role: Low-capacitance TVS pair (one per line) placed upstream of CAN transceiver input pins. Use Value: 271 pF capacitance avoids CAN bit timing skew; 200 W pulse rating handles repetitive surges in noisy plant-floor environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A-E3/57T | Higher 400 W PPP (8/20 µs), larger SMA (DO-214AC) package (4.5 mm × 2.7 mm), 45.4 V VC @ 12.3 A | Better suited for higher-energy surges but adds 2× board area and 3× capacitance (500 pF) | Select when surge energy exceeds 200 W and layout allows larger footprint |
| TPD2E001DRYR | 2-channel bidirectional array, 15 pF typical capacitance, 12 V VRWM, not AEC-Q101 qualified | Optimized for ultra-high-speed USB 3.0/PCIe; lacks automotive qualification and higher-voltage standoff | Prefer for low-capacitance, multi-line protection where AEC-Q101 is not required |
Compared with SMAJ22A-E3/57T and TPD2E001DRYR, the SMF22A-M3-18 delivers optimal balance of automotive-grade reliability, compact DO-219AB size, and 271 pF capacitance - making it ideal for cost-sensitive, space-constrained ESD protection in 22 V rail systems where ±30 kV immunity and AEC-Q101 compliance are mandatory.
Availability
SMF22A-M3-18 is available at Aetrix Electronics and suitable for automotive infotainment, industrial HMI displays, and consumer USB/HDMI interface designs requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant ESD protection.
Supply support for SMF22A-M3-18 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 compact, high-performance ESD protection for high-speed digital interfaces - engineered for AEC-Q101 compliance, low capacitance, and consistent clamping in harsh environments.
FAQ
What is the maximum clamping voltage of the SMF22A-M3-18 under standard IEC 61000-4-2 ESD conditions?
The SMF22A-M3-18 has a maximum clamping voltage (VC) of 35.5 V at 5.6 A peak pulse current with a 10/1000 µs waveform. This value is measured under standardized surge conditions and ensures protected downstream ICs - such as USB transceivers or HDMI PHYs rated for 3.3 V or 5 V operation - remain within safe voltage limits during ±30 kV contact discharge events. The SMF22A-M3-18 achieves this with low incremental surge resistance and fast avalanche response.
Is the SMF22A-M3-18 qualified for automotive applications?
Yes, the SMF22A-M3-18 is AEC-Q101 qualified and rated for operation from −65 °C to +175 °C junction temperature. It meets human body model (HBM) Class H3B (>8 kV) and passes full stress testing per AEC-Q101 Rev D. This makes the SMF22A-M3-18 suitable for use in automotive infotainment systems, body electronics, and ADAS sensor interfaces where reliability under thermal cycling and vibration is critical. The SMF22A-M3-18 is explicitly listed in Vishay's AEC-Q101 qualified product matrix.
What package type does the SMF22A-M3-18 use, and is it compatible with standard SMT assembly processes?
The SMF22A-M3-18 uses the DO-219AB (SMF) package - a low-profile surface-mount outline measuring 3.9 mm × 1.9 mm × 1.08 mm - and is fully compatible with standard wave and reflow soldering. It supports peak reflow temperatures up to 260 °C (per J-STD-020 MSL Level 1) and matches the footprint of SOD-123W, SOD-123F, and SOD-123FL packages. The SMF22A-M3-18's molded UL 94 V-0 compound and cathode bar marking simplify automated optical inspection and placement verification.
How does the capacitance of the SMF22A-M3-18 affect high-speed signal integrity?
The SMF22A-M3-18 exhibits 271 pF typical capacitance at 0 V and 1 MHz, which is optimized for data rates up to 100 Mbps - appropriate for USB 2.0, RS-485, and legacy HDMI applications. This value introduces negligible loading on properly terminated lines and avoids measurable rise-time degradation or jitter in most implementations. For higher-speed interfaces like USB 3.0 or HDMI 2.0, lower-capacitance alternatives would be required; the SMF22A-M3-18 is intentionally balanced for ESD robustness and signal fidelity in mid-speed applications.
Can the SMF22A-M3-18 be used in bidirectional protection configurations?
No - the SMF22A-M3-18 is a unidirectional TVS diode, designed for clamping only in reverse-bias mode relative to its marked cathode. It must be oriented with cathode toward the protected line's reference (e.g., ground) to function correctly. For bidirectional protection - such as symmetric AC-coupled lines or differential buses requiring clamping in both polarities - a dedicated bidirectional part (e.g., SMBJ22A) or dual-diode array would be required. Using the SMF22A-M3-18 in reverse orientation risks permanent failure during positive transients.
SMF22A-M3-18 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):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 5.6A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 271pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF22A-M3-18 FAQ
1.How can I place an order for SMF22A-M3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF22A-M3-18 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 SMF22A-M3-18 reliable?
The price and inventory of SMF22A-M3-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF22A-M3-18 is usually 5 days.
3.What payment methods are accepted for SMF22A-M3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF22A-M3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF22A-M3-18?
SMF22A-M3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF22A-M3-18 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 SMF22A-M3-18?
For technical support, including SMF22A-M3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF22A-M3-18 requirements.
6.How does Aetrix verify that SMF22A-M3-18 is sourced from the original manufacturer or authorized distributors?
All SMF22A-M3-18 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 SMF22A-M3-18 meets industry standards.
7.What is the process for return or replacement of SMF22A-M3-18?
All SMF22A-M3-18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF22A-M3-18, 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 SMF22A-M3-18 part is unused and in its original packaging.
Return procedure for SMF22A-M3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF22A-M3-18 Tags
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