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Vishay SMF51A-HE3_A08
- Part No.:
- SMF51A-HE3_A08
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF51A-HE3_A08.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,495
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Product details
Overview
SMF51A-HE3_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 51 V standoff voltage (VRWM), 82.4 V maximum clamping voltage at 2.4 A peak pulse current, ±30 kV IEC 61000-4-2 ESD immunity, and 200 W peak pulse power (10/1000 μs). It is AEC-Q101 qualified and used in automotive infotainment USB interfaces.
For engineers reviewing the SMF51A-HE3_A08 datasheet, SMF51A-HE3_A08 pinout, SMF51A-HE3_A08 application, or SMF51A-HE3_A08 equivalent, key selection criteria include clamping voltage under 2.4 A surge, low 151 pF capacitance at 0 V, AEC-Q101 qualification, SOD-123W-compatible DO-219AB footprint, and compliance with IEC 61000-4-2 contact/air discharge requirements.
Technical Context
This device operates as a single-channel unidirectional TVS diode, leveraging silicon avalanche breakdown to clamp transients above its reverse standoff voltage of 51 V. Its low incremental surge resistance ensures rapid response and minimal voltage overshoot during ESD events.
The SMF51A-HE3_A08 uses "Low Noise" technology for sub-nanosecond response time and maintains stable clamping performance across -65 °C to +175 °C operating temperature range. It is rated for 1000 W peak pulse power per IEC 61000-4-5 (8/20 μs) and supports wave/reflow soldering per J-STD-020 MSL level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 51 V - Maximum continuous reverse operating voltage before clamping begins |
| Clamping Voltage (VC) | 82.4 V at IPPM = 2.4 A (10/1000 μs) - Peak voltage seen by protected circuit during surge |
| Peak Pulse Power | 200 W (10/1000 μs) - Sustains short-duration surges without failure |
| Capacitance (CD) | 151 pF at VR = 0 V, f = 1 MHz - Low enough for USB 2.0 and CAN FD signal integrity |
| ESD Immunity | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - Meets automotive and industrial ESD robustness requirements |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including H3B human body model (>8 kV) |
| Package | DO-219AB (SMF) - Industry-standard low-profile SMD outline compatible with SOD-123W layout |
Pinout & Package
SMF51A-HE3_A08 is housed in the DO-219AB (SMF) package: 3.9 mm × 1.9 mm × 1.08 mm, cathode-bar marked, MSL level 1, reflow-compatible. The device has two terminals: anode and cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to signal line requiring ESD protection; referenced to system ground via cathode |
| Cathode | Ground reference | Connected to PCB ground plane; provides low-impedance path for transient current during clamping |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping architecture | Enables precise overvoltage protection on positive-going transients while minimizing leakage (<0.1 μA at 51 V) |
| "Low Noise" fast-response technology | Sub-1 ns response time ensures clamping initiates before sensitive ICs experience overstress |
| DO-219AB mechanical compatibility | Drop-in replacement for SOD-123W footprints without PCB redesign |
| AEC-Q101 qualification | Validated for automotive environments including thermal cycling, humidity, and mechanical shock |
| 1000 W IEC 61000-4-5 rating | Withstands lightning-induced surges on power and signal lines in industrial gateways |
Applications
| Automotive USB 2.0 Interface | Industrial CAN FD Bus Node |
|---|---|
Use Scenario: Protecting USB D+ and D- lines in vehicle infotainment head units against ESD from user interaction and cable hot-plug events. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed directly at connector, shunting ESD energy to chassis ground before it reaches USB transceiver. Use Value: 151 pF capacitance avoids signal distortion at 480 Mbps; ±30 kV ESD rating exceeds ISO 10605 requirements. | Use Scenario: Safeguarding CAN FD transceivers in factory automation controllers exposed to ESD during field maintenance or connector mating. IC Role / Device Role / Timing Role: Standoff-clamp TVS on CANH/CANL differential pair, maintaining common-mode noise rejection while suppressing fast transients. Use Value: 82.4 V clamping ensures transceiver remains within absolute max ratings during 2.4 A surge; DO-219AB footprint fits tight board spacing. |
| Medical Patient Monitor Data Port | Smart Building PoE+ Ethernet Interface |
Use Scenario: Shielding RS-232 or UART debug ports on Class II medical devices from ESD during clinical handling and probe connection. IC Role / Device Role / Timing Role: Single-line ESD suppressor on TX/RX lines, grounded to isolated digital ground to prevent leakage into patient-connected circuits. Use Value: 51 V VRWM matches typical UART logic swing; <0.1 μA IR at VRWM prevents battery drain in portable monitors. | Use Scenario: Protecting 10/100/1000BASE-T PHY pins in PoE+ powered devices (e.g., IP cameras) from installation-related ESD and induced surges. IC Role / Device Role / Timing Role: Per-pin TVS on MDI pairs, placed before magnetics to avoid saturation and maintain IEEE 802.3af/at compliance. Use Value: 200 W (10/1000 μs) rating handles multiple ESD strikes; low profile (1.08 mm height) enables slim enclosure designs. |
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 | DO-214AC (SMA) package; higher 1.5 mm height; 84.5 V VC at 2.4 A | Larger footprint; less suitable for ultra-thin automotive modules | Choose when existing SMA layout exists and height constraint is relaxed |
| TPD2E001DRSR | 2-channel bidirectional array; 12 pF capacitance; 5 V VRWM; not AEC-Q101 qualified | Designed for low-capacitance USB 2.0; lacks automotive qualification and 51 V standoff | Prefer for consumer USB ports where low capacitance dominates; avoid for automotive 51 V rail protection |
Compared with SMAJ51A-E3/5A and TPD2E001DRSR, SMF51A-HE3_A08 uniquely balances AEC-Q101 qualification, 51 V standoff, 151 pF capacitance, and DO-219AB low-profile packaging-making it optimal for space-constrained automotive and industrial signal line protection where reliability and standardized footprint matter.
Availability
SMF51A-HE3_A08 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial CAN FD nodes, and medical patient monitor data ports requiring stable component supply and long-term lifecycle support.
Supply support for SMF51A-HE3_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, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SMF series targets high-speed interface protection with AEC-Q101 qualification, optimized for USB, CAN, LIN, and Ethernet lines where low capacitance, fast response, and automotive-grade robustness are essential.
FAQ
What is the maximum clamping voltage of SMF51A-HE3_A08 under standard test conditions?
The SMF51A-HE3_A08 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 defines the peak voltage imposed on the protected circuit during transient events. The clamping performance is guaranteed across the full operating temperature range of -65 °C to +175 °C, and the SMF51A-HE3_A08 maintains this specification in production units per Vishay's AEC-Q101 qualification testing.
Is SMF51A-HE3_A08 suitable for protecting USB 2.0 differential pairs?
Yes, SMF51A-HE3_A08 is suitable for USB 2.0 protection when implemented per-channel (one device per line), thanks to its 151 pF capacitance at 0 V and 51 V standoff voltage. While lower-capacitance arrays exist, the SMF51A-HE3_A08's unidirectional architecture and ±30 kV IEC 61000-4-2 rating make it appropriate for host-side USB ports in automotive applications where ESD robustness outweighs marginal signal integrity trade-offs. The SMF51A-HE3_A08 must be placed adjacent to the connector with short traces to ground.
Does SMF51A-HE3_A08 meet AEC-Q101 requirements for automotive use?
Yes, SMF51A-HE3_A08 is explicitly AEC-Q101 qualified, including human body model (HBM) Class H3B (>8 kV), machine model (MM), and temperature cycling stress tests. The qualification applies to the full DO-219AB packaged device, and Vishay documents compliance in the official datasheet (Rev. 2.4, 04-Jul-2023, Doc. #85881). This makes SMF51A-HE3_A08 acceptable for front-end ESD protection in automotive modules such as telematics control units and body electronics.
What is the package type and footprint compatibility of SMF51A-HE3_A08?
SMF51A-HE3_A08 uses the DO-219AB (SMF) package: 3.9 mm × 1.9 mm × 1.08 mm, with cathode bar marking and MSL level 1 rating. It is mechanically compatible with SOD-123W footprints and shares identical pad dimensions and solder stencil recommendations. The SMF51A-HE3_A08's low profile and reflow-solderable construction support automated assembly in high-volume automotive PCB manufacturing.
How does the 200 W peak pulse power rating of SMF51A-HE3_A08 relate to real-world surge events?
The 200 W rating for SMF51A-HE3_A08 is specified for a 10/1000 μs double-exponential waveform, representing longer-duration transients like capacitive discharge or inductive switching spikes. In practice, this allows the SMF51A-HE3_A08 to safely absorb multiple ESD events per IEC 61000-4-2 and withstand repetitive surges in industrial control inputs. The rating assumes proper PCB layout with adequate copper pour for heat dissipation, and the SMF51A-HE3_A08's 180 K/W junction-to-ambient thermal resistance reflects this mounting condition.
SMF51A-HE3_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):
- 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 (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF51A-HE3_A08 FAQ
1.How can I place an order for SMF51A-HE3_A08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF51A-HE3_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 SMF51A-HE3_A08 reliable?
The price and inventory of SMF51A-HE3_A08 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_A08 is usually 5 days.
3.What payment methods are accepted for SMF51A-HE3_A08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF51A-HE3_A08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF51A-HE3_A08?
SMF51A-HE3_A08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF51A-HE3_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 SMF51A-HE3_A08?
For technical support, including SMF51A-HE3_A08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF51A-HE3_A08 requirements.
6.How does Aetrix verify that SMF51A-HE3_A08 is sourced from the original manufacturer or authorized distributors?
All SMF51A-HE3_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 SMF51A-HE3_A08 meets industry standards.
7.What is the process for return or replacement of SMF51A-HE3_A08?
All SMF51A-HE3_A08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF51A-HE3_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 SMF51A-HE3_A08 part is unused and in its original packaging.
Return procedure for SMF51A-HE3_A08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF51A-HE3_A08 Tags
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