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Vishay SMF22A-HE3_A18
- Part No.:
- SMF22A-HE3_A18
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF22A-HE3_A18.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,274
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Product details
Overview
SMF22A-HE3_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 22 V stand-off voltage (VRWM), 24.4–27 V reverse breakdown (VBR), 5.6 A peak pulse current (IPPM), 35.5 V maximum clamping voltage (VC), and 271 pF typical capacitance at 1 MHz - optimized for USB 2.0, HDMI, and industrial I/O port protection.
For engineers reviewing the SMF22A-HE3_A18 datasheet, SMF22A-HE3_A18 pinout, SMF22A-HE3_A18 application, or SMF22A-HE3_A18 equivalent, this device delivers verified ±30 kV IEC 61000-4-2 ESD immunity, AEC-Q101 qualification, low 1.08 mm profile, and SOD-123W-compatible footprint - critical for space-constrained automotive and industrial PCB designs requiring robust electrostatic discharge resilience.
Technical Context
The SMF22A-HE3_A18 operates as a unidirectional TVS diode with avalanche breakdown behavior, providing fast clamping response (<1 ns) to ESD transients per IEC 61000-4-2. Its low incremental surge resistance ensures minimal voltage overshoot during 10/1000 μs surges up to 200 W peak pulse power.
Designed for placement directly at connector interfaces, it supports bidirectional signal paths only when paired with complementary devices; its single-channel architecture protects one line-to-ground path with cathode-anode polarity defined by the bar marking on the DO-219AB package body.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 22 V - maximum continuous reverse operating voltage before significant leakage; sets safe margin below system rail voltage |
| Breakdown Voltage (VBR) | 24.4–27 V at 1 mA - defines onset of avalanche conduction; tight tolerance enables predictable clamping threshold |
| Clamping Voltage (VC) | 35.5 V at 5.6 A IPPM - peak voltage seen by protected circuit during worst-case 10/1000 μs surge |
| Capacitance (CD) | 271 pF at 0 V, 1 MHz - low enough for USB 2.0 (480 Mbps) signal integrity without excessive rise-time degradation |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - exceeds Level 4 immunity requirements for industrial and automotive end-equipment |
| Package | DO-219AB (SOD-123W-compatible) - 3.9 × 1.9 × 1.08 mm low-profile outline enabling high-density routing near connectors |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress per AEC standard |
Pinout & Package
SMF22A-HE3_A18 uses the DO-219AB (SOD-123W-compatible) surface-mount package: anodic terminal (anode) and cathodic terminal (cathode), with cathode identified by a bar marking on the device body. The package is lead (Pb)-free, RoHS-compliant, and rated MSL level 1 for unlimited floor life.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to protected signal line; conducts during positive transients relative to ground |
| Cathode | Ground reference | Connected to system ground plane; provides low-impedance path for ESD current dissipation |
Key Features
| Feature | Design Value |
|---|---|
| 200 W Peak Pulse Power (10/1000 μs) | Enables reliable suppression of high-energy lightning-induced surges in industrial fieldbus interfaces |
| ±30 kV ESD Immunity (IEC 61000-4-2) | Meets highest severity level for human-body and air-gap discharge in harsh manufacturing and service environments |
| Low 1.08 mm Height | Permits placement adjacent to USB/HDMI connectors without interfering with mating height or shield can clearance |
| AEC-Q101 Qualification | Validates suitability for under-hood and infotainment applications where thermal cycling and long-term reliability are mandatory |
| "Low Noise" Fast Response | Sub-nanosecond turn-on minimizes voltage overshoot during ESD events, preserving signal integrity in high-speed links |
Applications
| USB 2.0 Port Protection | HDMI Interface Protection |
|---|---|
Use Scenario: Protecting D+ and D− differential pairs in embedded host controllers against ESD during cable insertion or handling. IC Role / Device Role / Timing Role: Unidirectional line-to-ground TVS diode placed immediately at USB receptacle pins. Use Value: 271 pF capacitance avoids signal distortion at 480 Mbps; 35.5 V clamping prevents damage to PHY transceivers rated for ≤3.6 V supply rails. | Use Scenario: Safeguarding TMDS clock and data channels in display interface modules exposed to frequent hot-plug events. IC Role / Device Role / Timing Role: Single-channel ESD clamp per signal line, mounted within 3 mm of HDMI connector pads. Use Value: Low 1.08 mm profile allows co-location with shielded HDMI connectors; ±30 kV rating covers worst-case user ESD exposure. |
| Industrial I/O Port Protection | Automotive Sensor Interface Protection |
Use Scenario: Shielding RS-485/RS-232 transceiver inputs in programmable logic controllers subjected to factory-floor ESD. IC Role / Device Role / Timing Role: Line-to-ground TVS on each signal line (A/B, TX/RX), leveraging unidirectional clamping for DC-biased buses. Use Value: 22 V VRWM aligns with common 24 V industrial bus levels; AEC-Q101 qualification ensures operation across -65 °C to +175 °C ambient. | Use Scenario: Protecting LIN or CAN FD sensor nodes (e.g., temperature, pressure) from ESD during vehicle assembly or service. IC Role / Device Role / Timing Role: Point-of-entry ESD suppressor on sensor signal line, referenced to chassis ground. Use Value: 200 W pulse power withstands high-energy transients in 12 V automotive systems; DO-219AB package fits compact sensor housing footprints. |
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 | Higher 38.9 V clamping voltage at same 5.6 A IPPM; SMA (DO-214AC) package (4.5 × 2.7 × 2.2 mm) | Larger footprint and taller profile limit use in ultra-thin consumer electronics | Select when higher surge energy handling is needed and board space permits larger package |
| TPD2E001DRYR | 2-channel, 15 pF per line, 12 V VRWM; 0.65 mm × 0.65 mm DSBGA package | Designed for ultra-low-capacitance USB 2.0/3.0; not rated for AEC-Q101 or 200 W surge | Select for high-speed digital interfaces where <20 pF capacitance is mandatory and automotive qualification is not required |
Compared with SMAJ22A-E3/5A and TPD2E001DRYR, the SMF22A-HE3_A18 uniquely balances 271 pF capacitance, 35.5 V clamping, AEC-Q101 qualification, and sub-1.1 mm height - making it optimal for space-constrained industrial and automotive ports needing robust 200 W surge and ±30 kV ESD protection.
Availability
SMF22A-HE3_A18 is available at Aetrix Electronics and suitable for USB 2.0 port protection, HDMI interface hardening, and industrial I/O line safeguarding requiring stable component supply across production lifecycles.
Supply support for SMF22A-HE3_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, passive elements, and sensors, with leadership in power management, signal conditioning, and protection technologies.
The SMF series belongs to Vishay's eSMP® family of surface-mount TVS diodes, engineered specifically for high-reliability ESD and surge protection in automotive, industrial, and computing applications where compact size and certified robustness are essential.
FAQ
What is the maximum clamping voltage of the SMF22A-HE3_A18 under a 10/1000 μs surge?
The SMF22A-HE3_A18 has a maximum clamping voltage (VC) of 35.5 V at 5.6 A peak pulse current (IPPM) under the 10/1000 μs waveform. This value is measured per standard test conditions and defines the upper voltage limit imposed on protected circuits during transient events - critical for ensuring downstream ICs remain within absolute maximum ratings. The SMF22A-HE3_A18 achieves this with low incremental surge resistance and fast avalanche response.
Is the SMF22A-HE3_A18 qualified to AEC-Q101 for automotive use?
Yes, the SMF22A-HE3_A18 is explicitly AEC-Q101 qualified, as confirmed in Vishay's official documentation (Rev. 2.4, 04-Jul-2023). This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and ESD robustness - validating its suitability for automotive applications such as infotainment interfaces, sensor nodes, and body control modules. The SMF22A-HE3_A18 meets the full AEC-Q101-001 and -002 requirements.
What does the "HE3_A18" suffix indicate in SMF22A-HE3_A18?
The "HE3_A18" suffix denotes Vishay's packaging and environmental coding: "H" indicates AEC-Q101 qualification, "E3" specifies lead (Pb)-free, RoHS-compliant terminations with tin plating, and "A18" identifies 10k per 13″ reel packaging (8 mm tape, MOQ = 50k). This coding aligns with Vishay's standardized ordering nomenclature and confirms full compliance with automotive and environmental standards. The SMF22A-HE3_A18 is traceable to these specifications in the official datasheet.
Can the SMF22A-HE3_A18 be used for bidirectional signal lines like RS-485?
No, the SMF22A-HE3_A18 is a unidirectional TVS diode and must be used with correct polarity - anode to signal line, cathode to ground - making it unsuitable alone for true bidirectional AC-coupled lines. For RS-485, two SMF22A-HE3_A18 devices (one per line) or a dedicated bidirectional TVS like SMBJ22CA would be required. The SMF22A-HE3_A18's specified parameters assume unidirectional operation, and its electrical characteristics are not characterized for reverse conduction beyond VRWM.
What is the thermal resistance (RthJA) of the SMF22A-HE3_A18 on a standard PCB?
The junction-to-ambient thermal resistance (RthJA) of the SMF22A-HE3_A18 is 180 K/W when mounted on an epoxy-glass PCB with 3 mm × 3 mm copper pads ≥40 μm thick. This value reflects real-world thermal performance under standard JEDEC test conditions and informs thermal design margins - especially important in high-density layouts where multiple SMF22A-HE3_A18 devices may operate simultaneously during surge events. The SMF22A-HE3_A18's low RthJA supports reliable operation up to +175 °C junction temperature.
SMF22A-HE3_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):
- 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 (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF22A-HE3_A18 FAQ
1.How can I place an order for SMF22A-HE3_A18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF22A-HE3_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 SMF22A-HE3_A18 reliable?
The price and inventory of SMF22A-HE3_A18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF22A-HE3_A18 is usually 5 days.
3.What payment methods are accepted for SMF22A-HE3_A18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF22A-HE3_A18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF22A-HE3_A18?
SMF22A-HE3_A18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF22A-HE3_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 SMF22A-HE3_A18?
For technical support, including SMF22A-HE3_A18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF22A-HE3_A18 requirements.
6.How does Aetrix verify that SMF22A-HE3_A18 is sourced from the original manufacturer or authorized distributors?
All SMF22A-HE3_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 SMF22A-HE3_A18 meets industry standards.
7.What is the process for return or replacement of SMF22A-HE3_A18?
All SMF22A-HE3_A18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF22A-HE3_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 SMF22A-HE3_A18 part is unused and in its original packaging.
Return procedure for SMF22A-HE3_A18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF22A-HE3_A18 Tags
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