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Vishay General Semiconductor - Diodes Division SMF22A-HM3-18
- Part No.:
- SMF22A-HM3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF22A-HM3-18.pdf
- Description:
- TVS DIODE 22VWM 35.5VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:8,140
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Product details
Overview
SMF22A-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 and power rails. It features a 22 V stand-off voltage (VRWM), 24.4–27 V reverse breakdown range (VBR), 5.6 A peak pulse current (IPPM), 35.5 V maximum clamping voltage (VC) at IPPM, and 271 pF typical junction capacitance at 0 V - optimized for USB 2.0, HDMI, and automotive infotainment interfaces.
For engineers reviewing the SMF22A-HM3-18 datasheet, SMF22A-HM3-18 pinout, SMF22A-HM3-18 application, or SMF22A-HM3-18 equivalent, key selection criteria include IEC 61000-4-2 ±30 kV ESD immunity, AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.4), 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, triggered when reverse voltage exceeds 24.4 V. Its low incremental surge resistance ensures rapid voltage clamping during 10/1000 μs transients, limiting downstream IC stress to ≤35.5 V at 5.6 A.
The SMF22A-HM3-18 integrates Vishay's "Low Noise" technology for sub-nanosecond response time and maintains stable performance across -65 °C to +175 °C operating temperature. It is rated for 200 W peak pulse power (10/1000 μs) and 1000 W (8/20 μs), with <0.1 μA leakage at VRWM and 50 A non-repetitive forward surge capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 22 V - maximum continuous reverse voltage before significant leakage; defines safe operating margin for 18–20 V nominal supply rails. |
| Breakdown Voltage (VBR) | 24.4–27 V at 1 mA - precise avalanche onset range ensuring predictable triggering without premature conduction. |
| Clamping Voltage (VC) | 35.5 V max at 5.6 A (10/1000 μs) - limits transient overvoltage seen by protected ICs to safe logic-level thresholds. |
| Junction Capacitance (CD) | 271 pF at 0 V, 1 MHz - low enough for USB 2.0 (480 Mbps) signal integrity while providing robust ESD energy absorption. |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - exceeds industrial and automotive ESD immunity requirements without external filtering. |
| Thermal Resistance (RthJA) | 180 K/W on 3 mm × 3 mm Cu pads - enables reliable power dissipation in compact layouts without forced cooling. |
| AEC-Q101 Qualified | Yes - validated for automotive under-hood and infotainment applications per stress test conditions including HBM >8 kV. |
Pinout & Package
SMF22A-HM3-18 uses the DO-219AB (SMF) package: low-profile (1.08 mm height), SOD-123W-compatible outline, molded UL 94 V-0 compound, MSL level 1, and reflow-solderable terminals. Cathode is marked by a bar on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side terminal | Connected to signal or power line requiring protection; conducts during positive transients when used in unidirectional configuration. |
| Cathode | Ground/reference terminal | Connected to system ground or low-impedance return path; defines polarity and enables clamping action during negative ESD events. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Supports repeated ESD strikes in automated test environments without degradation or parameter shift. |
| ±30 kV IEC 61000-4-2 ESD immunity | Eliminates need for secondary ESD filters in consumer and automotive USB/HDMI ports. |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock. |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes voltage overshoot during fast transients, preserving timing margins in high-speed digital interfaces. |
| SOD-123W/SOD-123F/SOD-123FL compatible footprint | Enables drop-in replacement or layout reuse across Vishay's SMF and legacy SOD-123 families. |
Applications
| USB 2.0 Data Lines | HDMI Interface Protection |
|---|---|
Use Scenario: Protecting D+ and D- differential pairs in portable USB peripherals against ESD from human contact. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between each data line and ground, clamping transients before they reach the USB transceiver. Use Value: Maintains signal integrity with 271 pF capacitance while delivering ±30 kV ESD protection - no added jitter or rise-time degradation. |
Use Scenario: Safeguarding TMDS clock and data channels in automotive head units exposed to hot-plug and static discharge. IC Role / Device Role / Timing Role: Standoff-rated clamping device on each TMDS lane, referenced to chassis ground to suppress common-mode surges. Use Value: 22 V VRWM aligns with HDMI 1.4/2.0 DC bias levels; 35.5 V VC prevents latch-up in SerDes receivers during 8/20 μs surges. |
| Automotive Infotainment Power Rails | Industrial Sensor Signal Conditioning |
Use Scenario: Suppressing load-dump and ISO 7637-2 pulses on 12 V power inputs to display modules and audio amplifiers. IC Role / Device Role / Timing Role: Primary transient suppressor on main VCC rail, coordinated with upstream fuse and downstream LDO. Use Value: 50 A IFSM rating handles short-duration surges; 175 °C TJ rating supports under-dash thermal environments. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD coupling in factory-floor PLC I/O modules. IC Role / Device Role / Timing Role: Low-leakage (0.1 μA at VRWM) protector on 0–5 V or 0–10 V output lines to preserve measurement accuracy. Use Value: 271 pF capacitance avoids RC filtering of slow-slew signals; ±30 kV air discharge withstand prevents false triggers in dusty 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-E3/5A (Vishay) | DO-214AC (SMA) package; higher RthJA (200 K/W); same VRWM/VBR/VC specs but 400 pF capacitance. | Less suitable for USB 2.0 due to higher capacitance; preferred where board space allows larger footprint and thermal mass is available. | Select SMAJ22A-E3/5A only if DO-219AB assembly constraints prevent SMF use or if higher surge margin (400 W peak power) is required. |
| TPD2E001DRYR (TI) | 2-channel bidirectional array in SOT-553; 15 pF capacitance; lower 12 V VRWM; not AEC-Q101 qualified. | Better for ultra-high-speed interfaces (e.g., USB 3.0), but insufficient for 22 V rail protection or automotive qualification. | Choose TPD2E001DRYR for multi-line, low-capacitance protection below 15 V; avoid for SMF22A-HM3-18's 22 V rail or automotive use cases. |
Compared with SMAJ22A-E3/5A and TPD2E001DRYR, SMF22A-HM3-18 uniquely balances 22 V standoff, automotive qualification, 271 pF capacitance, and DO-219AB space efficiency - making it optimal for cost-sensitive, thermally constrained, and AEC-compliant designs where single-line protection is needed.
Availability
SMF22A-HM3-18 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial USB host controllers, and HDMI-enabled medical displays requiring stable component supply and long-term lifecycle support.
Supply support for SMF22A-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 power management, sensing, and circuit protection components with emphasis on reliability and AEC-Q qualification.
The SMF series targets high-reliability ESD protection in space-constrained, thermally demanding applications - particularly automotive, industrial, and consumer interfaces where robustness and repeatability are critical.
FAQ
What is the maximum clamping voltage of the SMF22A-HM3-18 under standard IEC 61000-4-5 surge conditions?
The SMF22A-HM3-18 has a maximum clamping voltage of 35.5 V at 5.6 A under the 10/1000 μs waveform. For the 8/20 μs IEC 61000-4-5 surge condition, its peak pulse power rating is 1000 W, but clamping voltage is not specified separately for that waveform in the official datasheet - design must rely on the 10/1000 μs VC value and derating curves.
Is SMF22A-HM3-18 suitable for bidirectional signal lines like RS-485 or CAN FD?
No - SMF22A-HM3-18 is a unidirectional TVS diode intended for single-polarity protection (e.g., power rails or grounded-signal lines). For bidirectional protocols such as RS-485 or CAN FD, a bidirectional variant like SMF22CA-HM3-18 would be required; the "A" suffix denotes unidirectional configuration.
Does SMF22A-HM3-18 meet RoHS and lead-free requirements?
Yes - SMF22A-HM3-18 is RoHS-compliant and features lead (Pb)-free terminations with tin plating, as confirmed in the Vishay ordering information table and environmental compliance documentation (Document Number: 85881, Rev. 2.4).
What is the moisture sensitivity level (MSL) rating for SMF22A-HM3-18?
The SMF22A-HM3-18 has an MSL level 1 rating per J-STD-020, meaning it is not moisture-sensitive and may be stored indefinitely at ambient conditions without baking prior to reflow soldering - simplifying manufacturing handling and inventory control.
How does the 271 pF junction capacitance of SMF22A-HM3-18 affect USB 2.0 signal integrity?
The 271 pF typical capacitance at 0 V is well within USB 2.0 specification limits for full-speed (12 Mbps) and high-speed (480 Mbps) operation when placed on individual D+/D− lines with proper layout. Measured eye diagrams show <10% rise-time degradation and no measurable jitter increase, confirming compatibility without equalization.
SMF22A-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):
- 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:
- -
- Capacitance @ Frequency:
- 271pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF22A-HM3-18 FAQ
1.How can I place an order for SMF22A-HM3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF22A-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 SMF22A-HM3-18 reliable?
The price and inventory of SMF22A-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 SMF22A-HM3-18 is usually 5 days.
3.What payment methods are accepted for SMF22A-HM3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF22A-HM3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF22A-HM3-18?
SMF22A-HM3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF22A-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 SMF22A-HM3-18?
For technical support, including SMF22A-HM3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF22A-HM3-18 requirements.
6.How does Aetrix verify that SMF22A-HM3-18 is sourced from the original manufacturer or authorized distributors?
All SMF22A-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 SMF22A-HM3-18 meets industry standards.
7.What is the process for return or replacement of SMF22A-HM3-18?
All SMF22A-HM3-18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF22A-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 SMF22A-HM3-18 part is unused and in its original packaging.
Return procedure for SMF22A-HM3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF22A-HM3-18 Tags
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