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Vishay General Semiconductor - Diodes Division SMF22A-HE3-08
- Part No.:
- SMF22A-HE3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF22A-HE3-08.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:23,283
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Product details
Overview
SMF22A-HE3-08 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for clamping transient overvoltages on signal or power lines. It features a 22 V standoff voltage (VRWM), 24.4–27 V reverse breakdown range (VBR), 5.6 A peak pulse current (IPPM) at 10/1000 μs, 35.5 V maximum clamping voltage (VC), and 271 pF typical junction capacitance at 0 V - optimized for high-speed USB 2.0, HDMI, and industrial I/O port protection.
For engineers reviewing the SMF22A-HE3-08 datasheet, SMF22A-HE3-08 pinout, SMF22A-HE3-08 application, or SMF22A-HE3-08 equivalent, key selection criteria include clamping performance under IEC 61000-4-2 ±30 kV contact discharge, low incremental surge resistance, AEC-Q101 qualification status, SOD-123W-compatible footprint, and thermal robustness up to +175 °C junction temperature.
Technical Context
This device operates as a single-channel unidirectional TVS diode, leveraging silicon avalanche technology to provide fast-response transient suppression. Its low clamping ratio (VC/VBR ≈ 1.35) and sub-nanosecond response time ensure effective protection of sensitive downstream ICs against ESD, EFT, and lightning-induced surges.
The SMF22A-HE3-08 is rated for 200 W peak pulse power (10/1000 μs), 1000 W (8/20 μs), and supports reflow/wave soldering per J-STD-020 MSL level 1. It meets AEC-Q101 stress tests including HBM >8 kV and IEC 61000-4-2 ±30 kV contact/air discharge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 22 V - maximum continuous reverse operating voltage before significant leakage; sets minimum system operating margin. |
| Breakdown Voltage (VBR) | 24.4–27 V at 1 mA - defines onset of avalanche conduction; ensures reliable triggering above normal signal swing. |
| Clamping Voltage (VC) | 35.5 V at 5.6 A (10/1000 μs) - peak voltage seen by protected circuit during worst-case surge; critical for IC survivability. |
| Junction Capacitance (CD) | 271 pF at 0 V, 1 MHz - directly impacts signal integrity in high-speed interfaces; suitable for ≤480 Mbps USB 2.0. |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - exceeds Level 4 immunity requirements for industrial and automotive ports. |
| Thermal Resistance (RthJA) | 180 K/W on 3 mm × 3 mm Cu pads - enables stable operation at TJ ≤175 °C with moderate PCB copper area. |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including HBM >8 kV, temperature cycling, and humidity testing. |
Pinout & Package
SMF22A-HE3-08 uses the DO-219AB (SMF) package: low-profile, surface-mount, cathode-bar marked, compatible with SOD-123W/SOD-123F footprints. Dimensions: 3.9 mm × 1.9 mm × 1.08 mm (L × W × H). Mold compound: UL 94 V-0, MSL level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/line side connection | Connected to protected signal/power line; conducts surge current toward ground when clamped. |
| Cathode | Ground reference terminal | Connected to system ground plane; establishes reference for clamping action and defines unidirectional polarity. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Supports robust surge handling in industrial control I/O without derating at ambient ≤85 °C. |
| Low clamping voltage (35.5 V @ 5.6 A) | Provides ≥2.5 V margin below 3.3 V rail-tied logic IC absolute maximum ratings. |
| 271 pF junction capacitance | Enables use on full-speed USB 2.0 data lines without measurable eye diagram degradation. |
| AEC-Q101 qualified | Validated for automotive infotainment and body electronics where long-term field reliability is mandatory. |
| SOD-123W footprint compatibility | Allows drop-in replacement in existing layouts designed for industry-standard low-profile TVS packages. |
Applications
| Industrial PLC I/O Protection | Automotive Infotainment Ports |
|---|---|
Use Scenario: Protecting 24 V digital input channels in programmable logic controllers against induced surges and ESD events from field wiring. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between signal line and chassis ground to clamp transients before reaching input buffer ICs. Use Value: Maintains functional safety by limiting voltage to ≤35.5 V during 1 kV/500 A surge, preventing latch-up or permanent damage to 24 V-rated interface ICs. |
Use Scenario: Shielding USB 2.0 and HDMI ports in head units and display modules from ESD during user interaction and assembly. IC Role / Device Role / Timing Role: Signal-line ESD suppressor mounted adjacent to connector, with cathode tied to clean digital ground. Use Value: Delivers ±30 kV IEC 61000-4-2 immunity while adding only 271 pF loading - preserving signal rise/fall times and eye opening. |
| Medical Sensor Interfaces | Smart Building Control Panels |
Use Scenario: Safeguarding analog sensor inputs (e.g., thermocouple, RTD) in patient monitoring devices from electrostatic discharge during clinical handling. IC Role / Device Role / Timing Role: Low-leakage (0.1 μA max at 22 V) clamping diode placed before precision amplifier input stage. Use Value: Prevents amplifier saturation or offset shift during ESD events, ensuring uninterrupted measurement accuracy and regulatory compliance (IEC 60601-1-2). |
Use Scenario: Securing RS-485 communication lines in HVAC controllers and lighting gateways exposed to building-wide EMI and maintenance-related ESD. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS used across differential pair with shared ground reference. Use Value: Clamps common-mode surges up to 200 W without degrading data integrity at 10 Mbps, supporting EN 55032 Class B emissions limits. |
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 clamping voltage (41.5 V), larger SMA (DO-214AC) package, 3.5 mm × 4.5 mm footprint. | Lower capacitance (150 pF) but less space-efficient; better for RF-sensitive circuits where layout area permits. | Select when lower capacitance outweighs board space constraints and higher VC is acceptable for 3.3 V systems. |
| TPD2E001DRYR | 2-channel, 15 pF dual-channel ESD array; not AEC-Q101 qualified; 5 V VRWM; SC-70 package. | Designed for high-speed data lines (USB, HDMI); unsuitable for 22 V power rail protection. | Choose only for low-voltage, multi-line signal protection where ultra-low capacitance is mandatory and automotive qualification is not required. |
Compared with SMAJ22A-E3/57T and TPD2E001DRYR, the SMF22A-HE3-08 delivers optimal balance of compact DO-219AB size, automotive-grade reliability, and clamping performance tailored for 22 V industrial and automotive power/signal lines - neither alternative matches its combination of standoff voltage, package profile, and qualification scope.
Availability
SMF22A-HE3-08 is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive infotainment port hardening, and medical sensor interface safeguarding requiring stable component supply across extended production lifecycles.
Supply support for SMF22A-HE3-08 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 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 cost-effective, space-constrained ESD protection in harsh environments - engineered for AEC-Q101 compliance, low-profile mounting, and consistent clamping performance across temperature and lifetime.
FAQ
What is the maximum clamping voltage of the SMF22A-HE3-08 under standard test conditions?
The SMF22A-HE3-08 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 represents the highest voltage the protected circuit will experience during a standardized surge event - critical for ensuring downstream ICs remain within their absolute maximum ratings.
Is the SMF22A-HE3-08 qualified to AEC-Q101, and what does that qualification cover?
Yes, the SMF22A-HE3-08 is AEC-Q101 qualified. This certification confirms successful completion of stress tests including human body model ESD (>8 kV), temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing - validating its suitability for automotive electronic control units, infotainment systems, and body electronics where long-term reliability is essential.
What is the junction capacitance of the SMF22A-HE3-08, and how does it affect high-speed signal lines?
The SMF22A-HE3-08 exhibits 271 pF typical junction capacitance at 0 V and 1 MHz. While higher than some ultra-low-capacitance arrays, this value is well-suited for full-speed USB 2.0 (480 Mbps) and industrial RS-485 links, where signal integrity remains intact due to controlled edge rates and proper PCB layout - verified in Vishay's application notes for SMF-series placement near connectors.
Can the SMF22A-HE3-08 be used in bidirectional protection configurations?
No - the SMF22A-HE3-08 is a unidirectional TVS diode, intended for DC-biased or ground-referenced lines. For true bidirectional protection (e.g., AC-coupled data lines), two SMF22A-HE3-08 devices must be connected anode-to-anode or a dedicated bidirectional part like SMBJ22CA should be selected instead.
What is the recommended PCB footprint and soldering profile for the SMF22A-HE3-08?
The SMF22A-HE3-08 uses the DO-219AB outline, matching SOD-123W land patterns: 2.9 mm × 1.4 mm pad length/width with 1.3 mm spacing. Reflow soldering follows J-STD-020, peak temperature ≤260 °C, and MSL level 1 handling - no baking required. Vishay provides detailed footprint recommendations in document S8-V-3915.01-001.
SMF22A-HE3-08 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:
- -
- 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-HE3-08 FAQ
1.How can I place an order for SMF22A-HE3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF22A-HE3-08 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-HE3-08 reliable?
The price and inventory of SMF22A-HE3-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF22A-HE3-08 is usually 5 days.
3.What payment methods are accepted for SMF22A-HE3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF22A-HE3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF22A-HE3-08?
SMF22A-HE3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF22A-HE3-08 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-HE3-08?
For technical support, including SMF22A-HE3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF22A-HE3-08 requirements.
6.How does Aetrix verify that SMF22A-HE3-08 is sourced from the original manufacturer or authorized distributors?
All SMF22A-HE3-08 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-HE3-08 meets industry standards.
7.What is the process for return or replacement of SMF22A-HE3-08?
All SMF22A-HE3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF22A-HE3-08, 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-HE3-08 part is unused and in its original packaging.
Return procedure for SMF22A-HE3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF22A-HE3-08 Tags
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