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Vishay SMF22A-HM3_A08
- Part No.:
- SMF22A-HM3_A08
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF22A-HM3_A08.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,315
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Product details
Overview
SMF22A-HM3_A08 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 junction capacitance at 0 V - optimized for USB 2.0, HDMI, and industrial I/O port protection.
For engineers reviewing the SMF22A-HM3_A08 datasheet, SMF22A-HM3_A08 pinout, SMF22A-HM3_A08 application, or SMF22A-HM3_A08 equivalent, this device delivers ±30 kV IEC 61000-4-2 ESD immunity, AEC-Q101 qualification, low 1.08 mm profile, and compatibility with wave/reflow soldering - critical for automotive infotainment, industrial HMI, and ruggedized communication interfaces.
Technical Context
The SMF22A-HM3_A08 operates as a single-channel unidirectional TVS diode with cathode-anode polarity, leveraging silicon avalanche clamping to divert ESD transients before system damage. Its 10/1000 μs waveform rating supports 200 W peak pulse power, while its 8/20 μs IEC 61000-4-5 rating enables 1000 W surge handling - essential for interface-level protection in mixed-signal environments.
Designed for low-noise, fast-response operation, it achieves sub-nanosecond response time and exhibits stable clamping behavior across -65 °C to +175 °C operating range. Its 0.1 μA max reverse leakage at VRWM ensures minimal signal loading on high-impedance lines such as sensor inputs and analog front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 22 V - defines maximum continuous operating voltage before conduction; suitable for 18–20 V nominal bus systems. |
| Reverse Breakdown (VBR) | 24.4–27 V at 1 mA - ensures reliable triggering above normal operating voltage without false clamping. |
| Clamping Voltage (VC) | 35.5 V at 5.6 A IPPM - limits downstream voltage stress during ESD events to protect 3.3 V/5 V logic interfaces. |
| Junction Capacitance (CD) | 271 pF at 0 V, 1 MHz - balances ESD robustness and signal integrity for <100 Mbps digital lines. |
| ESD Immunity | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - exceeds Level 4 requirements for end-equipment certification. |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including HBM >8 kV and temperature cycling (-65 °C to +175 °C). |
| Package | DO-219AB (SOD-123W-compatible) - 3.9 × 1.9 × 1.08 mm low-profile outline enabling dense PCB layouts. |
Pinout & Package
SMF22A-HM3_A08 uses the DO-219AB (SMF) package: anodic cathode-marked, two-terminal surface-mount device with cathode band indicating terminal 1. The package conforms to JEDEC MO-229 and is compatible with SOD-123W footprint recommendations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 (cathode) | Protected line connection | Connected to signal line requiring ESD protection; clamps to ground when transient exceeds VBR. |
| Terminal 2 (anode) | Ground reference | Must be tied to low-inductance system ground plane to ensure effective transient diversion and minimize voltage overshoot. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables robust protection against repetitive ESD events without thermal degradation in portable equipment. |
| ±30 kV IEC 61000-4-2 ESD immunity | Meets highest industrial and automotive ESD test levels without external circuitry or layout reinforcement. |
| Low 1.08 mm height | Supports ultra-thin designs in space-constrained applications like automotive telematics modules and handheld HMIs. |
| AEC-Q101 qualified | Validated for automotive under-hood and infotainment use with guaranteed lifetime performance at 175 °C junction temp. |
| Wave and reflow solderable | Compatible with standard SMT assembly processes up to 260 °C peak, eliminating need for special thermal profiles. |
Applications
| Automotive Infotainment Display Port | Industrial PLC Digital I/O Module |
|---|---|
|
Use Scenario: Protecting HDMI and LVDS video signal lines between head unit and display in vehicles exposed to ESD during service or user interaction. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed inline on each differential pair, referenced to chassis ground. Use Value: Clamps transients to ≤35.5 V within nanoseconds, preserving signal integrity of 1.65 V common-mode HDMI signals while meeting ISO 10605 requirements. |
Use Scenario: Shielding 24 V digital input channels in programmable logic controllers from field-induced ESD and inductive switching spikes. IC Role / Device Role / Timing Role: Standoff-rated TVS on each input line, positioned before optocoupler or Schmitt trigger input stage. Use Value: Withstands 22 V DC bias and suppresses ±30 kV discharges without latch-up, ensuring deterministic state transitions during factory floor operation. |
| USB 2.0 Host Interface Protection | Ruggedized Medical Sensor Interface |
|
Use Scenario: Safeguarding D+ and D- lines of embedded USB host ports in diagnostic equipment subject to frequent cable hot-plug events. IC Role / Device Role / Timing Role: Dual-channel discrete placement (one per line), grounded via shortest possible trace to system GND. Use Value: 271 pF capacitance avoids USB 2.0 eye diagram distortion, while 35.5 V clamping prevents PHY damage during 15 kV human-body model events. |
Use Scenario: Protecting analog sensor outputs (e.g., thermocouple amplifiers, pressure transducers) in portable medical devices used in clinical environments. IC Role / Device Role / Timing Role: Low-leakage (0.1 μA) unidirectional clamp on signal path between sensor and ADC input. Use Value: Maintains <1 μV offset error contribution and prevents ESD-induced ADC saturation, supporting IEC 60601-1-2 compliance. |
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 peak power (400 W @ 10/1000 μs), larger SMA package (4.5 × 2.7 × 2.2 mm), 43.5 V VC at 5.2 A. | Preferred where higher surge margin is needed but board space allows larger footprint; less suitable for ultra-thin designs. | Select SMAJ22A-E3/57T if system-level surge testing requires >200 W margin and height constraint is relaxed. |
| TPD2E007DRYR | 2-channel bidirectional array, 10 pF CD, 12 V VRWM, 15 kV ESD rating - not AEC-Q101 qualified. | Targeted at low-capacitance USB/SDIO protection; lacks automotive qualification and 22 V standoff capability. | Choose TPD2E007DRYR only for non-automotive, high-speed (<480 Mbps), low-voltage (≤3.6 V) interfaces where capacitance is critical. |
Compared with SMAJ22A-E3/57T and TPD2E007DRYR, SMF22A-HM3_A08 uniquely balances 22 V standoff, AEC-Q101 qualification, 1.08 mm height, and ±30 kV ESD rating - making it optimal for space-limited automotive and industrial control applications demanding full IEC 61000-4-2 compliance.
Availability
SMF22A-HM3_A08 is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O, and medical sensor interface designs requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant ESD protection.
Supply support for SMF22A-HM3_A08 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, and passive components for automotive, industrial, and computing markets.
The SMF series targets compact, high-performance ESD protection for high-speed interfaces - engineered for AEC-Q101 compliance, low-profile mounting, and consistent clamping across extreme temperature ranges.
FAQ
What is the maximum clamping voltage of SMF22A-HM3_A08 under specified test conditions?
The SMF22A-HM3_A08 has a maximum reverse clamping voltage (VC) of 35.5 V when subjected to its rated peak pulse current of 5.6 A using a 10/1000 μs waveform. This value is measured per the Electrical Characteristics table in Vishay's Document Number 85881 Rev. 2.4 and ensures downstream ICs operating at 3.3 V or 5 V remain within safe voltage margins during ESD events.
Is SMF22A-HM3_A08 qualified to AEC-Q101, and what does that qualification cover?
Yes, SMF22A-HM3_A08 is AEC-Q101 qualified, covering stress tests including high-temperature operating life, temperature cycling, ESD (HBM >8 kV), and mechanical shock. This qualification confirms suitability for automotive applications such as infotainment, body control modules, and ADAS sensor interfaces where reliability over extended temperature ranges (-65 °C to +175 °C) is mandatory.
What is the junction capacitance of SMF22A-HM3_A08, and how does it affect high-speed signal lines?
The SMF22A-HM3_A08 exhibits 271 pF typical junction capacitance at 0 V and 1 MHz. This value is appropriate for protecting USB 2.0, RS-485, and industrial CAN FD lines where signal rise times exceed ~1 ns, but may limit use in >1 Gbps interfaces like USB 3.0 or PCIe - where lower-capacitance alternatives (e.g., <5 pF arrays) would be required instead.
Can SMF22A-HM3_A08 be used in bidirectional signal protection applications?
No, SMF22A-HM3_A08 is a unidirectional TVS diode intended for DC-biased lines with defined polarity (e.g., 24 V inputs, USB VBUS). For bidirectional AC-coupled or symmetric signal lines like RS-232 or Ethernet, a bidirectional variant such as SMF22CA-HM3_A08 - which features symmetrical clamping in both directions - must be selected instead.
What is the recommended PCB footprint and soldering profile for SMF22A-HM3_A08?
The SMF22A-HM3_A08 uses the DO-219AB (SMF) package and aligns with SOD-123W footprint recommendations: 2.9 mm pad length, 1.3 mm pad width, and 1.4 mm center-to-center spacing. Reflow soldering must follow J-STD-020 MSL level 1 guidelines, with peak temperature not exceeding 260 °C for ≤30 seconds - verified in Vishay's Package Data section.
SMF22A-HM3_A08 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-HM3_A08 FAQ
1.How can I place an order for SMF22A-HM3_A08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF22A-HM3_A08 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_A08 reliable?
The price and inventory of SMF22A-HM3_A08 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_A08 is usually 5 days.
3.What payment methods are accepted for SMF22A-HM3_A08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF22A-HM3_A08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF22A-HM3_A08?
SMF22A-HM3_A08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF22A-HM3_A08 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_A08?
For technical support, including SMF22A-HM3_A08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF22A-HM3_A08 requirements.
6.How does Aetrix verify that SMF22A-HM3_A08 is sourced from the original manufacturer or authorized distributors?
All SMF22A-HM3_A08 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_A08 meets industry standards.
7.What is the process for return or replacement of SMF22A-HM3_A08?
All SMF22A-HM3_A08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF22A-HM3_A08, 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_A08 part is unused and in its original packaging.
Return procedure for SMF22A-HM3_A08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF22A-HM3_A08 Tags
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