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Vishay General Semiconductor - Diodes Division SMF51A-HE3-08
- Part No.:
- SMF51A-HE3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF51A-HE3-08.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,329
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Product details
Overview
SMF51A-HE3-08 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 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 applications.
For engineers reviewing the SMF51A-HE3-08 datasheet, SMF51A-HE3-08 pinout, SMF51A-HE3-08 application, or SMF51A-HE3-08 equivalent, this device is selected for robust overvoltage protection in USB 2.0, HDMI, CAN FD, and automotive infotainment interfaces where low capacitance, fast response, and high surge robustness are critical.
Technical Context
This diode operates as a single-channel unidirectional TVS, leveraging silicon avalanche breakdown to clamp transients above its reverse standoff voltage. Its low incremental surge resistance ensures minimal voltage overshoot during 10/1000 μs surges, while "Low Noise" technology enables sub-nanosecond response to ESD events.
The device is rated for 200 W peak pulse power (10/1000 μs), 1000 W (8/20 μs), and supports continuous operation from −65 °C to +175 °C. It meets AEC-Q101 stress tests including HBM >8 kV and IEC 61000-4-2 ±30 kV contact/air discharge - confirming suitability for harsh automotive and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 51 V - defines maximum continuous operating voltage before clamping begins; sets safe margin below system rail voltage. |
| Clamping Voltage (VC) | 82.4 V at IPPM = 2.4 A (10/1000 μs) - limits transient-induced stress on downstream ICs during surge events. |
| Capacitance (CD) | 151 pF at VR = 0 V, f = 1 MHz - low enough for USB 2.0 and CAN FD signal integrity without excessive rise-time degradation. |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - exceeds Level 4 immunity requirements for automotive ECUs and infotainment ports. |
| Package | DO-219AB (SOD-123W-compatible) - 3.9 mm × 1.9 mm × 1.08 mm low-profile outline enabling dense PCB layouts and automated reflow assembly. |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing. |
| Peak Pulse Power | 200 W (10/1000 μs), 1000 W (8/20 μs) - supports both ESD and lightning-induced surge suppression per IEC 61000-4-5. |
Pinout & Package
SMF51A-HE3-08 uses the DO-219AB (SMF) package: molded SMD case with cathode band marking, 2-terminal configuration, and dimensions of 3.9 mm (L) × 1.9 mm (W) × 1.08 mm (H). Compatible with SOD-123W footprint and reflow soldering profiles up to 260 °C peak.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/line side terminal | Connected to protected signal line; conducts during forward-biased surges (e.g., negative transients on ground-referenced lines). |
| Cathode | Output/clamp-to-rail terminal | Connected to system ground or reference rail; provides low-impedance path to shunt positive transients above VRWM. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping | Protects against positive transients only; preserves DC bias integrity on single-supply interfaces like CAN or RS-485. |
| Low clamping ratio (VC/VRWM ≈ 1.62) | Minimizes voltage overshoot relative to standoff level - critical for safeguarding 5 V or 3.3 V logic inputs. |
| 151 pF capacitance at 0 V | Enables use on 480 Mbps USB 2.0 differential pairs without measurable eye diagram distortion. |
| AEC-Q101 qualified | Validated for automotive under-hood and cabin modules requiring extended temperature range and long-term reliability. |
| Wave and reflow solderable | Compatible with standard J-STD-020 MSL Level 1 reflow profiles - no pre-baking required for production assembly. |
Applications
| Automotive Infotainment Port Protection | USB 2.0 Data Line Protection |
|---|---|
Use Scenario: Protecting HDMI and LVDS video links between head unit and display in vehicles exposed to ESD from user interaction and electromagnetic noise. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed inline on each differential pair, referenced to chassis ground. Use Value: Clamps ±30 kV ESD strikes to <83 V within nanoseconds, preventing latch-up or damage to SerDes ICs operating at 1.8 V or 3.3 V. |
Use Scenario: Safeguarding D+ and D− lines of USB 2.0 host/device ports in industrial HMIs and medical devices. IC Role / Device Role / Timing Role: Low-capacitance transient suppressor mounted adjacent to connector, with cathode tied to system ground. Use Value: 151 pF capacitance avoids signal integrity degradation at 480 Mbps, while 82.4 V clamping protects PHY transceivers from bus-level surges. |
| CAN FD Bus Node Protection | Industrial Sensor Interface Protection |
Use Scenario: Securing CAN FD transceiver inputs (CANH/CANL) in battery management systems and ADAS control units. IC Role / Device Role / Timing Role: Dual-diode configuration (one per line) with cathodes grounded, providing bidirectional protection via two unidirectional devices. Use Value: Withstand repetitive 10/1000 μs surges up to 200 W while maintaining <1 ns response - preserving bit timing integrity at 5 Mbps. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) connected to microcontroller ADC inputs in factory automation equipment. IC Role / Device Role / Timing Role: Single-line protection on 0–5 V or 0–10 V output rails, anode to signal, cathode to ground. Use Value: 51 V VRWM allows safe operation across wide supply ranges; 175 °C max junction temperature supports use near motors or power converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51A-E3/5A (Vishay) | DO-214AC (SMA) package; larger footprint (4.5 mm × 2.7 mm); 84.5 V VC at 2.3 A; 160 pF. | Higher thermal mass but less suitable for space-constrained USB or automotive camera modules. | Select SMAJ51A-E3/5A when board area permits and higher surge energy handling (400 W) is prioritized over capacitance. |
| TPD2E001DRYR (TI) | 0.65 mm × 0.65 mm DRY (X2SON) package; dual-channel; 12 pF @ 0 V; 17 V VRWM; not AEC-Q101 qualified. | Designed for ultra-low-capacitance USB/MIPI protection; lacks automotive qualification and 51 V standoff capability. | Choose TPD2E001DRYR only for non-automotive, high-speed digital interfaces needing <15 pF - not a direct replacement for SMF51A-HE3-08's voltage rating or ruggedness. |
Compared with SMAJ51A-E3/5A and TPD2E001DRYR, SMF51A-HE3-08 uniquely balances 51 V standoff, 151 pF capacitance, AEC-Q101 qualification, and DO-219AB compactness - making it optimal for automotive USB, CAN FD, and sensor nodes where space, reliability, and voltage rating are jointly constrained.
Availability
SMF51A-HE3-08 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial USB 2.0 peripherals, and CAN FD node designs requiring stable component supply, long-lifecycle support, and AEC-Q101-compliant ESD protection.
Supply support for SMF51A-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 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 is part of Vishay's eSMP® family of surface-mount TVS diodes, engineered specifically for high-reliability ESD and surge protection in automotive, industrial, and communications systems demanding AEC-Q101 compliance and low-profile packaging.
FAQ
What is the standoff voltage of SMF51A-HE3-08, and how does it relate to system design?
The SMF51A-HE3-08 has a maximum standoff voltage (VRWM) of 51 V, meaning it remains non-conductive up to that DC or RMS voltage. This value must exceed the highest normal operating voltage on the protected line - for example, it safely guards 48 V industrial buses or 36 V automotive loads. Exceeding VRWM risks premature conduction and power loss, so designers verify margin against worst-case rail tolerances before selecting SMF51A-HE3-08.
Does SMF51A-HE3-08 meet automotive qualification standards?
Yes, SMF51A-HE3-08 is AEC-Q101 qualified, having passed stress tests including human body model ESD (>8 kV), temperature cycling, and high-temperature operating life. This certification confirms its suitability for automotive applications such as infotainment, ADAS, and body control modules where reliability under thermal and electrical stress is mandatory - a key differentiator from commercial-grade TVS diodes.
What is the clamping voltage of SMF51A-HE3-08 under a 10/1000 μs surge?
Under a 10/1000 μs waveform at 2.4 A peak pulse current (IPPM), the SMF51A-HE3-08 clamps to a maximum of 82.4 V. This value represents the upper voltage limit imposed on downstream circuitry during surge events - critical for ensuring protected ICs (e.g., USB transceivers or CAN controllers) remain within their absolute maximum ratings. The low clamping ratio (82.4 V / 51 V ≈ 1.62) reflects efficient avalanche response.
Can SMF51A-HE3-08 be used for bidirectional signal lines like RS-485?
No - SMF51A-HE3-08 is a unidirectional TVS diode, optimized for clamping positive transients only. For bidirectional lines such as RS-485 or full-duplex CAN, designers must use either two SMF51A-HE3-08 devices (anode-to-line, cathode-to-ground for each polarity) or select a dedicated bidirectional variant like SMF51CA-HE3-08. Using a single unidirectional device on a bidirectional line leaves negative transients unprotected.
What is the thermal resistance (RthJA) of SMF51A-HE3-08, and why does it matter?
The SMF51A-HE3-08 has a junction-to-ambient thermal resistance (RthJA) of 180 K/W when mounted on a 3 mm × 3 mm Cu pad on epoxy-glass PCB. This parameter determines how much the junction temperature rises under sustained power dissipation - for example, 1 W of average surge power increases TJ by 180 °C above ambient. Designers use RthJA to assess derating needs and ensure operation stays within the 175 °C max junction limit, especially in sealed enclosures or high-temperature environments.
SMF51A-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):
- 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:
- -
- Capacitance @ Frequency:
- 151pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF51A-HE3-08 FAQ
1.How can I place an order for SMF51A-HE3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF51A-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 SMF51A-HE3-08 reliable?
The price and inventory of SMF51A-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 SMF51A-HE3-08 is usually 5 days.
3.What payment methods are accepted for SMF51A-HE3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF51A-HE3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF51A-HE3-08?
SMF51A-HE3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF51A-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 SMF51A-HE3-08?
For technical support, including SMF51A-HE3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF51A-HE3-08 requirements.
6.How does Aetrix verify that SMF51A-HE3-08 is sourced from the original manufacturer or authorized distributors?
All SMF51A-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 SMF51A-HE3-08 meets industry standards.
7.What is the process for return or replacement of SMF51A-HE3-08?
All SMF51A-HE3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF51A-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 SMF51A-HE3-08 part is unused and in its original packaging.
Return procedure for SMF51A-HE3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF51A-HE3-08 Tags
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