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Vishay General Semiconductor - Diodes Division SMF28A-E3-08
- Part No.:
- SMF28A-E3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF28A-E3-08.pdf
- Description:
- TVS DIODE 28VWM 45.4VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:110,589
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Product details
Overview
SMF28A-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 low-capacitance signal lines. It features a 28 V stand-off voltage (VRWM), 31.1–34.4 V reverse breakdown range (VBR), 4.4 A peak pulse current (IPPM), 45.4 V maximum clamping voltage (VC), and 227 pF typical capacitance at 0 V - optimized for USB 2.0, HDMI, and industrial I/O interfaces.
For engineers reviewing the SMF28A-E3-08 datasheet, SMF28A-E3-08 pinout, SMF28A-E3-08 application, or SMF28A-E3-08 equivalent, this device delivers verified ±30 kV IEC 61000-4-2 ESD immunity, AEC-Q101 qualification, low incremental surge resistance, and SOD-123W-compatible footprint - critical for high-reliability board-level ESD hardening in automotive and industrial designs.
Technical Context
This diode operates as a single-channel unidirectional TVS, leveraging silicon avalanche clamping to divert ESD transients before they reach sensitive downstream circuitry. Its low 227 pF capacitance and fast response time enable use on high-speed data lines without signal integrity degradation.
The device sustains 200 W peak pulse power (10/1000 μs), handles 50 A non-repetitive forward surge current (8.3 ms half-sine), and maintains thermal stability up to 175 °C junction temperature - validated per AEC-Q101 stress tests including HBM >8 kV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 28 V - maximum continuous reverse operating voltage before clamping begins; sets safe margin above 24 V system rails. |
| Reverse Breakdown (VBR) | 31.1–34.4 V at 1 mA - defines onset of avalanche conduction; ensures reliable triggering during overvoltage events. |
| Clamping Voltage (VC) | 45.4 V at 4.4 A IPPM - limits voltage seen by protected ICs during 10/1000 μs surges; enables robust interface survivability. |
| Peak Pulse Current (IPPM) | 4.4 A (10/1000 μs) - quantifies maximum transient energy absorption capability under standardized surge waveform. |
| Capacitance (CD) | 227 pF at 0 V, 1 MHz - low enough for USB 2.0 (480 Mbps) and industrial serial buses without measurable signal distortion. |
| ESD Immunity | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - exceeds Level 4 requirements; eliminates need for secondary ESD stages in most designs. |
| Package | DO-219AB (SOD-123W-compatible) - 3.9 × 1.9 × 1.08 mm low-profile outline enabling dense PCB layouts and automated reflow assembly. |
Pinout & Package
SMF28A-E3-08 uses the DO-219AB (SOD-123W-compatible) surface-mount package with cathode marking bar. The device has two terminals: anode and cathode - configured for unidirectional clamping between signal line and ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Signal Line Connection | Connected to protected I/O trace; conducts surge current toward cathode during positive transients. |
| Cathode | Ground Reference Terminal | Connected to system ground plane; establishes clamping reference and provides return path for ESD current. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W Peak Pulse Power (10/1000 μs) | Enables robust protection against repetitive low-energy transients in industrial control and sensor interfaces. |
| ±30 kV ESD Immunity (IEC 61000-4-2) | Eliminates field failures from handling and connector mating in factory and end-user environments. |
| AEC-Q101 Qualified | Validated for automotive under-hood and infotainment applications requiring extended temperature and reliability compliance. |
| Low 227 pF Capacitance | Maintains signal integrity on 480 Mbps USB 2.0 and 100 Mbps Ethernet PHY lines without added termination or equalization. |
| Wave & Reflow Solderable | Compatible with standard Pb-free reflow profiles (peak ≤260 °C); supports high-yield automated manufacturing. |
Applications
| USB 2.0 Interface Protection | HDMI Data Lane Protection |
|---|---|
|
Use Scenario: Protecting D+ and D− lines of USB 2.0 host/device ports against ESD during cable insertion and hot-plug events. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between signal line and ground, clamping transients within 1 ns. Use Value: Prevents latch-up or damage to USB transceivers while preserving 480 Mbps eye diagram integrity via 227 pF capacitance. |
Use Scenario: Safeguarding TMDS data channels in HDMI 1.4 receivers against electrostatic discharge during display connection. IC Role / Device Role / Timing Role: Low-capacitance clamping device mounted directly at HDMI connector pins to minimize stub length. Use Value: Maintains differential impedance and rise/fall time fidelity with <230 pF loading, avoiding pixel jitter or color banding. |
| Industrial RS-485 Transceiver Protection | Automotive CAN FD Node Protection |
|
Use Scenario: Shielding RS-485 transceivers (e.g., MAX1487) on factory floor PLC modules from ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Standoff-rated TVS on A/B differential pair, referenced to local ground with minimal parasitic inductance. Use Value: Withstands 4.4 A surge current and clamps to 45.4 V, keeping transceiver inputs within absolute maximum ratings during 1 kV EFT bursts. |
Use Scenario: Adding board-level ESD resilience to CAN FD nodes in vehicle body control modules exposed to service technician handling. IC Role / Device Role / Timing Role: AEC-Q101-qualified unidirectional TVS on CANH/CANL lines, grounded to chassis via low-inductance path. Use Value: Delivers ±30 kV contact discharge immunity without degrading 5 Mbps CAN FD bit timing due to sub-250 pF capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A-E3/57T | Higher 53.3 V clamping voltage at same 4.4 A IPPM; SMA package (larger footprint, 4.5 × 2.7 mm). | Less suitable for space-constrained USB/HDMI layouts; better for higher-power industrial AC-coupled lines. | Select SMAJ28A-E3/57T only when board area permits larger package and higher VC is acceptable for protected IC's voltage tolerance. |
| TPD2E001DRYR | 2-channel, 15 pF dual-diode array; lower capacitance but 150 W peak power and no AEC-Q101 rating. | Optimized for ultra-high-speed digital interfaces (e.g., MIPI), not automotive or high-surge industrial environments. | Choose TPD2E001DRYR for compact dual-lane protection where ESD level ≤±15 kV suffices and AEC-Q101 is not required. |
Compared with SMAJ28A-E3/57T and TPD2E001DRYR, SMF28A-E3-08 uniquely balances AEC-Q101 qualification, 227 pF capacitance, DO-219AB miniaturization, and 45.4 V clamping - making it the preferred choice for automotive and industrial signal-line protection where reliability, size, and signal fidelity are jointly constrained.
Availability
SMF28A-E3-08 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI data lane hardening, and industrial RS-485 transceiver safeguarding requiring stable component supply across production lifecycles.
Supply support for SMF28A-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 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 board-level ESD protection in space-constrained, high-speed applications - engineered for AEC-Q101 compliance, low capacitance, and robust transient suppression in consumer, automotive, and industrial electronics.
FAQ
What is the clamping voltage of SMF28A-E3-08 at its rated peak pulse current?
The SMF28A-E3-08 has a maximum clamping voltage (VC) of 45.4 V at 4.4 A peak pulse current (IPPM) under 10/1000 μs waveform conditions. This value is measured per IEC 61000-4-5 test methodology and ensures protected ICs remain within safe operating voltage limits during surge events. The clamping performance is guaranteed across the full -65 °C to +175 °C operating temperature range specified for SMF28A-E3-08.
Is SMF28A-E3-08 qualified to AEC-Q101 standards?
Yes, SMF28A-E3-08 is AEC-Q101 qualified, meeting stress test requirements for automotive-grade discrete semiconductors including human body model (HBM) ESD >8 kV, temperature cycling, and high-temperature operating life. This qualification is explicitly documented in Vishay's Rev. 2.4 datasheet (Document Number: 85881) and confirms suitability for under-hood and cabin electronics where SMF28A-E3-08 is deployed.
What package does SMF28A-E3-08 use, and is it compatible with standard SMT processes?
SMF28A-E3-08 uses the DO-219AB package (also known as SOD-123W-compatible), measuring 3.9 × 1.9 × 1.08 mm with cathode marking. It is fully wave and reflow solderable, qualified for Pb-free reflow profiles with peak temperature up to 260 °C per J-STD-020 MSL level 1 - ensuring compatibility with standard high-volume SMT assembly lines used for SMF28A-E3-08 integration.
How does the 227 pF capacitance of SMF28A-E3-08 affect high-speed signal integrity?
The 227 pF typical capacitance of SMF28A-E3-08 at 0 V and 1 MHz is low enough to avoid measurable degradation on USB 2.0 (480 Mbps) and RS-485 (up to 20 Mbps) signals when placed with short trace lengths (<5 mm) and proper grounding. Vishay's characterization confirms minimal impact on rise/fall times and eye opening - a key design advantage of SMF28A-E3-08 over higher-capacitance alternatives in signal-path protection.
What is the maximum operating temperature range for SMF28A-E3-08?
SMF28A-E3-08 is rated for an operating temperature range of -65 °C to +175 °C, matching its storage temperature specification. This wide range supports deployment in under-hood automotive modules, industrial motor drives, and outdoor telecom equipment where ambient temperatures exceed 125 °C - a capability confirmed in Vishay's AEC-Q101 qualification testing for SMF28A-E3-08.
SMF28A-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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 4.4A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 227pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF28A-E3-08 FAQ
1.How can I place an order for SMF28A-E3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF28A-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 SMF28A-E3-08 reliable?
The price and inventory of SMF28A-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 SMF28A-E3-08 is usually 5 days.
3.What payment methods are accepted for SMF28A-E3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF28A-E3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF28A-E3-08?
SMF28A-E3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF28A-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 SMF28A-E3-08?
For technical support, including SMF28A-E3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF28A-E3-08 requirements.
6.How does Aetrix verify that SMF28A-E3-08 is sourced from the original manufacturer or authorized distributors?
All SMF28A-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 SMF28A-E3-08 meets industry standards.
7.What is the process for return or replacement of SMF28A-E3-08?
All SMF28A-E3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF28A-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 SMF28A-E3-08 part is unused and in its original packaging.
Return procedure for SMF28A-E3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF28A-E3-08 Tags
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