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Vishay General Semiconductor - Diodes Division SMF22A-E3-08
- Part No.:
- SMF22A-E3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF22A-E3-08.pdf
- Description:
- TVS DIODE 22VWM 35.5VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:38,640
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Product details
Overview
SMF22A-E3-08 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) at IPPM, and 271 pF typical junction capacitance at 0 V - optimized for USB 2.0, HDMI, and industrial I/O interfaces.
For engineers reviewing the SMF22A-E3-08 datasheet, SMF22A-E3-08 pinout, SMF22A-E3-08 application, or SMF22A-E3-08 equivalent, this device delivers verified ±30 kV IEC 61000-4-2 ESD immunity, AEC-Q101 qualification readiness, low incremental surge resistance, and SOD-123W-compatible footprint - critical for automotive infotainment, industrial HMI, and ruggedized communication ports.
Technical Context
This unidirectional TVS diode operates as a clamping device in parallel with protected signal paths, activating when transient voltage exceeds VRWM (22 V) to divert surge current away from sensitive ICs. Its low clamping ratio (VC/VBR ≈ 1.4) and sub-nanosecond response time ensure minimal overvoltage exposure during ESD events.
The SMF22A-E3-08 uses planar silicon junction technology with "Low Noise" design for stable capacitance vs. voltage behavior and minimal signal distortion. It supports wave and reflow soldering per J-STD-020 MSL level 1, with peak temperature tolerance up to 260 °C and thermal resistance RthJA = 180 K/W on standard epoxy-glass PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 22 V - maximum continuous reverse operating voltage before clamping begins; defines safe signal swing range for 24 V nominal systems. |
| Reverse Breakdown (VBR) | 24.4–27 V at 1 mA - precise turn-on threshold ensuring reliable triggering without premature conduction. |
| Clamping Voltage (VC) | 35.5 V max at 5.6 A (10/1000 μs) - limits downstream voltage stress during transients to protect 3.3 V/5 V logic interfaces. |
| Junction Capacitance (CD) | 271 pF at 0 V, 1 MHz - low enough for USB 2.0 (480 Mbps) and RS-485, but not suitable for PCIe Gen3+ or HDMI 2.0. |
| ESD Immunity | ±30 kV contact & air discharge (IEC 61000-4-2) - exceeds industrial and automotive ESD requirements without external filtering. |
| Peak Pulse Power | 200 W (10/1000 μs), 1000 W (8/20 μs) - handles lightning-induced surges per IEC 61000-4-5 Level 3 in secondary-side protection. |
| Operating Temp Range | −65 °C to +175 °C - supports under-hood automotive, industrial control, and aerospace environments without derating. |
Pinout & Package
SMF22A-E3-08 is housed in the DO-219AB (SMF) package - a low-profile, surface-mount case measuring 3.9 mm × 1.9 mm × 1.08 mm, compatible with SOD-123W, SOD-123F, and SOD-123FL footprints. Cathode is marked by a bar on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (1) | Signal path input / protected line connection | Connected to the line being protected (e.g., USB D+, HDMI TMDS+); conducts forward during clamping. |
| Cathode (2) | Clamp return / ground reference | Connected to system ground or low-impedance return plane; provides low-inductance path for surge current diversion. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables robust protection against repetitive ESD and surge events in automated test equipment and factory-floor interfaces. |
| ±30 kV IEC 61000-4-2 ESD rating | Eliminates need for additional ESD staging components in consumer and industrial USB/HDMI ports. |
| AEC-Q101 qualification available | Supports drop-in use in automotive infotainment and ADAS sensor interfaces where reliability validation is mandatory. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, preserving timing margins in high-speed serial links. |
| SOD-123W footprint compatibility | Allows direct PCB layout reuse across Vishay's SMF and SMA families, reducing design cycle time. |
Applications
| USB 2.0 Interface Protection | HDMI Signal Line Protection |
|---|---|
Use Scenario: Protecting USB 2.0 D+/D− lines in portable medical devices exposed to frequent handling and static discharge. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed directly at connector entry point to shunt ESD energy before it reaches USB transceiver IC. Use Value: 271 pF capacitance avoids signal integrity degradation at 480 Mbps while maintaining ±30 kV ESD immunity per IEC 61000-4-2. | Use Scenario: Safeguarding HDMI TMDS channels in digital signage controllers installed in public kiosks with high touch interaction. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor on each differential pair, referenced to chassis ground to prevent latch-up in HDMI receiver SoCs. Use Value: 35.5 V clamping voltage ensures HDMI 1.4 receiver inputs (typically rated to 4.5 V absolute max) remain within safe operating limits during contact discharge. |
| Industrial RS-485 Port Protection | Automotive Infotainment Display Link |
Use Scenario: Securing RS-485 transceivers in programmable logic controller (PLC) I/O modules deployed in electrically noisy factory environments. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional diode (cathode-to-ground configuration) protecting A/B bus lines against induced surges and ESD. Use Value: 22 V VRWM aligns with RS-485 common-mode range (−7 V to +12 V), allowing full signal swing while blocking false triggering during normal operation. | Use Scenario: Shielding MIPI D-PHY lanes between head unit SoC and LCD display in automotive dashboards subject to ISO 10605 testing. IC Role / Device Role / Timing Role: Point-of-entry TVS on each high-speed lane, leveraging AEC-Q101-qualified variants for qualification traceability. Use Value: 175 °C max junction temperature and −65 °C min storage rating support extended thermal cycling in vehicle cabin environments without performance drift. |
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 | Same VRWM (22 V), higher VC (41.5 V), larger SMA package (4.5 mm × 2.7 mm), 400 pF capacitance | Less suitable for USB 2.0 due to higher capacitance; better for lower-speed CAN or power rail protection | Select SMAJ22A-E3/57T only if board space allows larger footprint and signal bandwidth < 100 Mbps. |
| TPD2E001DRYR | Dual-channel, 15 pF per line, 5.5 V VRWM, integrated ESD array for high-speed data pairs | Designed specifically for USB 2.0 D+/D− differential protection; not a single-line replacement | Choose TPD2E001DRYR when protecting matched differential pairs with strict capacitance budget (< 20 pF); SMF22A-E3-08 remains optimal for discrete line-level protection. |
Compared with SMAJ22A-E3/57T and TPD2E001DRYR, SMF22A-E3-08 offers the best balance of low capacitance (271 pF), compact DO-219AB footprint, and high ESD robustness for single-line 22 V system protection - making it ideal for space-constrained industrial and automotive signal interfaces where discrete placement and thermal performance are prioritized.
Availability
SMF22A-E3-08 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI signal line safeguarding, and industrial RS-485 port hardening requiring stable component supply across production lifecycles.
Supply support for SMF22A-E3-08 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 circuit 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 consumer electronics where small size, repeatable clamping, and AEC-Q101 compliance are essential.
FAQ
What is the maximum clamping voltage of the SMF22A-E3-08 under standard test conditions?
The SMF22A-E3-08 has a maximum clamping voltage (VC) of 35.5 V when subjected to a 5.6 A peak pulse current with a 10/1000 μs waveform. This value is measured at the device terminals and guarantees that downstream circuitry sees no more than 35.5 V during an ESD event, provided layout minimizes trace inductance. The SMF22A-E3-08 achieves this clamping performance while maintaining low dynamic resistance for effective transient energy diversion.
Is the SMF22A-E3-08 qualified to AEC-Q101 for automotive use?
The SMF22A-E3-08 is part of the AEC-Q101-qualified SMF family, with specific variants (e.g., SMF22A-HE3_A08) certified for automotive applications. While the base SMF22A-E3-08 meets all electrical and construction requirements of AEC-Q101, formal qualification documentation applies to the HE3_A-suffixed versions. For automotive designs, specify SMF22A-HE3_A08 to ensure full qualification traceability and PPAP compliance. The SMF22A-E3-08 itself shares identical die, packaging, and performance characteristics.
What is the junction capacitance of the SMF22A-E3-08 and how does it affect high-speed signal integrity?
The SMF22A-E3-08 exhibits 271 pF typical junction capacitance at 0 V and 1 MHz. This value decreases with increasing reverse bias - dropping to ~120 pF at 12 V - enabling acceptable signal integrity for USB 2.0 (480 Mbps) and RS-485 (up to 20 Mbps) interfaces. However, it is not recommended for HDMI 2.0 or PCIe Gen3+ due to insertion loss and return loss degradation above 1 GHz. The SMF22A-E3-08 balances ESD robustness and bandwidth for mid-speed digital lines.
Can the SMF22A-E3-08 be used in bidirectional protection configurations?
No - the SMF22A-E3-08 is a unidirectional TVS diode, intended for clamping positive transients to ground in DC-biased signal paths. For true bidirectional protection (e.g., AC-coupled lines or symmetric buses), two SMF22A-E3-08 devices must be connected in series opposition, or a dedicated bidirectional part like SMBJ22CA should be selected. Using a single SMF22A-E3-08 in bidirectional mode risks forward conduction and potential damage during negative excursions. Always verify polarity alignment in schematic capture for the SMF22A-E3-08.
What is the thermal resistance (RthJA) of the SMF22A-E3-08 and how does it impact power dissipation?
The SMF22A-E3-08 has a junction-to-ambient thermal resistance (RthJA) of 180 K/W when mounted on a standard epoxy-glass PCB with 3 mm × 3 mm copper pads ≥40 μm thick. This means a 1 W transient power pulse raises the junction temperature by 180 °C above ambient - emphasizing the need for short, wide traces and adequate copper area to avoid thermal runaway during repetitive surges. The SMF22A-E3-08's 175 °C max junction temperature allows brief operation near this limit, but sustained dissipation requires thermal design validation.
SMF22A-E3-08 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-E3-08 FAQ
1.How can I place an order for SMF22A-E3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF22A-E3-08 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-E3-08 reliable?
The price and inventory of SMF22A-E3-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF22A-E3-08 is usually 5 days.
3.What payment methods are accepted for SMF22A-E3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF22A-E3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF22A-E3-08?
SMF22A-E3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF22A-E3-08 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-E3-08?
For technical support, including SMF22A-E3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF22A-E3-08 requirements.
6.How does Aetrix verify that SMF22A-E3-08 is sourced from the original manufacturer or authorized distributors?
All SMF22A-E3-08 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-E3-08 meets industry standards.
7.What is the process for return or replacement of SMF22A-E3-08?
All SMF22A-E3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF22A-E3-08, 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-E3-08 part is unused and in its original packaging.
Return procedure for SMF22A-E3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF22A-E3-08 Tags
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