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Vishay General Semiconductor - Diodes Division SMF51A-E3-08
- Part No.:
- SMF51A-E3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF51A-E3-08.pdf
- Description:
- TVS DIODE 51VWM 82.4VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:15,192
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Product details
Overview
SMF51A-E3-08 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for low-capacitance transient suppression on high-speed data lines. It features a 51 V standoff voltage (VRWM), 82.4 V maximum clamping voltage at 2.4 A peak pulse current, 151 pF typical capacitance at 0 V, ±30 kV IEC 61000-4-2 ESD immunity, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SMF51A-E3-08 datasheet, SMF51A-E3-08 pinout, SMF51A-E3-08 application, or SMF51A-E3-08 equivalent, this device is selected for robust overvoltage protection in USB 2.0, HDMI, Ethernet PHY interfaces, and automotive infotainment data buses where low clamping voltage and sub-200 pF capacitance are critical to signal integrity.
Technical Context
The SMF51A-E3-08 operates as a single-channel unidirectional TVS diode with avalanche breakdown behavior, optimized for fast response (<1 ns) to electrostatic discharge events. Its junction structure delivers low incremental surge resistance and stable clamping performance under 10/1000 μs transients up to 200 W peak pulse power.
It is rated for continuous operation from –65 °C to +175 °C, supports wave and reflow soldering per J-STD-020 MSL level 1, and uses UL 94 V-0 molding compound. The cathode-bar marked SOD-123W-compatible DO-219AB package enables compact PCB layout with 3.9 mm × 1.9 mm footprint and 1.08 mm height.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 51 V - Maximum continuous reverse operating voltage before leakage exceeds 0.1 µA; defines safe working range for protected line. |
| Clamping Voltage (VC) | 82.4 V at IPPM = 2.4 A (10/1000 µs) - Peak voltage seen by downstream circuit during worst-case surge; limits stress on IC inputs. |
| Capacitance (CD) | 151 pF at VR = 0 V, f = 1 MHz - Low enough for USB 2.0 (480 Mbps) and HDMI 1.4 signal paths without measurable insertion loss. |
| ESD Rating | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - Meets highest industrial and automotive ESD immunity requirements without external shielding. |
| Peak Pulse Power | 200 W (10/1000 µs), 1000 W (8/20 µs) - Handles repetitive surges in CAN/LIN bus nodes and infotainment display interfaces. |
| AEC-Q101 Qualified | Yes - Validated for automotive underhood and cabin applications including head units, ADAS camera links, and body control modules. |
| Package | DO-219AB (SOD-123W compatible) - 3.9 mm × 1.9 mm × 1.08 mm footprint; enables high-density routing and automated assembly. |
Pinout & Package
SMF51A-E3-08 is housed in the DO-219AB (SOD-123W-compatible) surface-mount package with two terminals: anode and cathode. Cathode is marked by a bar on the device top surface. The package is lead (Pb)-free, RoHS-compliant, and rated for peak reflow temperature of 260 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side connection | Connected to the signal or power line requiring protection; referenced to system ground via cathode path during clamping. |
| Cathode | Ground reference terminal | Must be connected to low-impedance system ground plane; determines clamping threshold and provides discharge path for transients. |
Key Features
| Feature | Design Value |
|---|---|
| Low clamping voltage | 82.4 V at 2.4 A ensures downstream 5 V or 3.3 V logic interfaces remain within absolute maximum ratings during surge events. |
| Ultra-low capacitance | 151 pF minimizes signal distortion and reflection on high-speed differential pairs such as USB D+/D– and HDMI TMDS lines. |
| Fast response time | <1 ns turn-on enables effective suppression of ESD pulses before sensitive ICs experience overstress. |
| AEC-Q101 qualification | Validated for automotive temperature cycling, humidity, and mechanical shock - suitable for Tier-1 production without additional qualification. |
| Reflow/wave solder compatible | MSL level 1 rating and 260 °C peak temperature tolerance support standard SMT assembly without baking or special handling. |
Applications
| USB 2.0 Interface Protection | HDMI 1.4 Data Line Protection |
|---|---|
|
Use Scenario: Protecting D+ and D– lines of USB 2.0 host/device ports against ESD and cable discharge events in automotive infotainment systems. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between signal line and chassis ground, clamping transients before they reach USB transceiver ICs. Use Value: 151 pF capacitance avoids signal rise-time degradation; 82.4 V clamping prevents damage to 3.3 V tolerant PHY inputs during ±30 kV contact discharge. |
Use Scenario: Safeguarding TMDS clock and data channels in HDMI 1.4 displays used in vehicle rear-seat entertainment units. IC Role / Device Role / Timing Role: Single-channel transient suppressor on each TMDS pair, mounted adjacent to connector to minimize inductance. Use Value: Low clamping voltage preserves eye diagram integrity at 165 MHz pixel clock; DO-219AB package fits tight 0.5 mm pitch routing constraints. |
| Automotive LIN Bus Node | Industrial Ethernet PHY Port |
|
Use Scenario: Protecting LIN transceiver pins in body control modules exposed to load dump and ESD in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Standoff-rated TVS on LIN bus line, referenced to battery ground, absorbing 10/1000 µs surges up to 200 W. Use Value: 51 V VRWM matches LIN's 12 V nominal + 40 V transients; AEC-Q101 qualification ensures reliability across -40 °C to +125 °C ambient. |
Use Scenario: Shielding 10/100BASE-TX PHY differential pairs in factory automation gateways subject to field-induced surges. IC Role / Device Role / Timing Role: Bidirectional protection not required; unidirectional SMF51A-E3-08 used on DC-biased MDI lines with defined polarity. Use Value: 2.4 A IPPM rating handles IEC 61000-4-5 8/20 µs surges; 180 K/W thermal resistance allows sustained operation on standard FR-4 PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51A-E3/57T | Higher clamping voltage (93.6 V at 2.2 A), larger SMA (DO-214AC) package (4.5 mm × 2.7 mm), 200 pF capacitance. | Less suitable for USB/HDMI due to higher capacitance and slower response; preferred for lower-speed power rail protection. | Select when board space permits larger footprint and higher clamping is acceptable for 24 V industrial I/O lines. |
| TPD2E001DRYR | 2-channel bidirectional array, 15 pF per channel, 12 V VRWM, not AEC-Q101 qualified, 0402 package. | Designed for ultra-high-speed digital interfaces (e.g., USB 3.0, MIPI); unsuitable for 51 V standoff or automotive underhood environments. | Choose only for space-constrained consumer electronics with ≤12 V rails and no automotive qualification requirement. |
Compared with SMAJ51A-E3/57T and TPD2E001DRYR, SMF51A-E3-08 uniquely balances 51 V standoff, 151 pF capacitance, AEC-Q101 compliance, and DO-219AB miniaturization - making it the optimal choice for automotive-grade high-speed data line protection where both voltage margin and signal fidelity are critical.
Availability
SMF51A-E3-08 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial Ethernet gateways, and USB-C docking stations requiring stable component supply, long-term lifecycle assurance, and AEC-Q101-compliant ESD protection.
Supply support for SMF51A-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 high-speed data line protection with optimized clamping, low capacitance, and automotive qualification - engineered specifically for USB, HDMI, LVDS, and automotive serial bus interfaces.
FAQ
What is the maximum clamping voltage of SMF51A-E3-08 under standard test conditions?
The SMF51A-E3-08 has a maximum clamping voltage (VC) of 82.4 V when subjected to a 10/1000 µs surge current of 2.4 A. This value is measured per IEC 61000-4-5 and guarantees that downstream circuitry remains within safe operating limits during transient events. The clamping performance is repeatable and validated across the full -65 °C to +175 °C operating temperature range.
Is SMF51A-E3-08 suitable for protecting USB 2.0 differential pairs?
Yes, SMF51A-E3-08 is suitable for USB 2.0 protection: its 151 pF capacitance at 0 V introduces negligible impedance mismatch on D+ and D– lines, preserving signal integrity up to 480 Mbps. The 51 V standoff voltage provides ample margin above USB's 3.3 V signaling level, and the ±30 kV ESD rating exceeds IEC 61000-4-2 requirements for end-equipment certification.
Does SMF51A-E3-08 meet AEC-Q101 qualification standards?
Yes, SMF51A-E3-08 is AEC-Q101 qualified, having passed stress tests including high-temperature operating life, temperature cycling, and ESD human body model (H3B > 8 kV). This qualification confirms suitability for automotive applications such as infotainment head units, ADAS camera links, and body control modules where reliability under harsh environmental conditions is mandatory.
What is the package type and dimensions of SMF51A-E3-08?
SMF51A-E3-08 uses the DO-219AB package (JEDEC outline SOD-123W compatible), measuring 3.9 mm × 1.9 mm × 1.08 mm with a cathode bar marking. Its footprint requires 1.3 mm × 1.3 mm pad spacing and supports both reflow and wave soldering per J-STD-020 MSL level 1, enabling high-yield automated assembly in automotive and industrial manufacturing.
How does the 51 V standoff voltage of SMF51A-E3-08 relate to its use in 24 V automotive systems?
The 51 V standoff voltage (VRWM) of SMF51A-E3-08 provides robust margin above typical 24 V automotive nominal rails, accommodating load dump transients up to ISO 7637-2 Pulse 5a (up to 60 V). With a clamping voltage of 82.4 V, it protects downstream 3.3 V or 5 V logic while remaining below the breakdown threshold of most 100 V-rated interface ICs - ensuring fail-safe operation without false triggering.
SMF51A-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):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 2.4A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 151pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF51A-E3-08 FAQ
1.How can I place an order for SMF51A-E3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF51A-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 SMF51A-E3-08 reliable?
The price and inventory of SMF51A-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 SMF51A-E3-08 is usually 5 days.
3.What payment methods are accepted for SMF51A-E3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF51A-E3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF51A-E3-08?
SMF51A-E3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF51A-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 SMF51A-E3-08?
For technical support, including SMF51A-E3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF51A-E3-08 requirements.
6.How does Aetrix verify that SMF51A-E3-08 is sourced from the original manufacturer or authorized distributors?
All SMF51A-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 SMF51A-E3-08 meets industry standards.
7.What is the process for return or replacement of SMF51A-E3-08?
All SMF51A-E3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF51A-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 SMF51A-E3-08 part is unused and in its original packaging.
Return procedure for SMF51A-E3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF51A-E3-08 Tags
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