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Vishay SMF51A-HE3_A18
- Part No.:
- SMF51A-HE3_A18
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF51A-HE3_A18.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,699
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Product details
Overview
SMF51A-HE3_A18 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for high-speed data lines requiring ±30 kV IEC 61000-4-2 contact/air discharge immunity, 51 V standoff voltage, and 2.4 A peak pulse current (10/1000 μs). It delivers 200 W peak pulse power and clamps to 82.4 V at rated surge current, supporting automotive and industrial interface protection.
For engineers reviewing the SMF51A-HE3_A18 datasheet, SMF51A-HE3_A18 pinout, SMF51A-HE3_A18 application, or SMF51A-HE3_A18 equivalent, this device is selected for robust transient suppression on USB 2.0, CAN FD, and Ethernet PHY lines where low capacitance (151 pF at 0 V), fast response, and AEC-Q101 qualification are required.
Technical Context
This diode operates as a unidirectional TVS (transient voltage suppressor) with a single protection path, leveraging silicon avalanche breakdown for precise reverse standoff (VRWM = 51 V) and sharp clamping (VC = 82.4 V at IPPM). Its low incremental surge resistance ensures minimal voltage overshoot during fast transients.
Designed for board-level ESD hardening, it complies with IEC 61000-4-2 (±30 kV) and AEC-Q101 (H3B > 8 kV HBM), and features "Low Noise" technology enabling sub-nanosecond response-critical for preserving signal integrity on high-speed interfaces up to 100 Mbps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 51 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 48 V nominal systems. |
| Clamping Voltage (VC) | 82.4 V max at 2.4 A (10/1000 μs) - Peak voltage seen by protected IC during surge; ensures downstream logic remains within absolute maximum ratings. |
| Peak Pulse Power | 200 W (10/1000 μs) - Sustains standardized lightning/surge waveforms without degradation; validated per IEC 61000-4-5. |
| Capacitance (CD) | 151 pF at 0 V, 1 MHz - Low enough for USB 2.0 (480 Mbps) and CAN FD (5 Mbps) without signal distortion or rise-time degradation. |
| ESD Rating | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - Exceeds Level 4 immunity requirements for consumer and automotive electronics. |
| Operating Temp Range | −65 °C to +175 °C - Supports under-hood automotive, industrial control, and outdoor equipment deployments. |
Pinout & Package
The SMF51A-HE3_A18 uses the DO-219AB (SMF) package: low-profile (1.08 mm height), SOD-123W-compatible outline, molded in UL 94 V-0 compound, MSL level 1, and reflow-solderable with peak temperature ≤260 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to signal line needing protection; conducts surge current toward cathode during overvoltage events. |
| Cathode | Ground reference | Connected to system ground or chassis; provides low-impedance return path for transient energy dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces per stress test requirements. |
| Low-profile DO-219AB | 1.08 mm height enables use in space-constrained modules such as telematics units and compact IoT gateways. |
| "Low Noise" fast response | Sub-nanosecond turn-on time minimizes voltage overshoot and preserves timing margins on high-speed digital buses. |
| Wave/reflow solderable | Compatible with standard SMT assembly processes without special handling or pre-baking due to MSL level 1 rating. |
Applications
| USB 2.0 Interface Protection | CAN FD Bus Protection |
|---|---|
Use Scenario: Protecting D+ and D− lines of USB 2.0 host/device ports against ESD events during hot-plug and field operation. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed directly at connector, shunting transients before they reach USB transceiver IC. Use Value: 151 pF capacitance avoids signal integrity loss at 480 Mbps; 82.4 V clamping prevents damage to 3.3 V or 5 V PHY circuitry. | Use Scenario: Safeguarding CAN FD controller and transceiver pins in automotive body control modules and battery management systems. IC Role / Device Role / Timing Role: Standoff-rated (51 V) clamp protecting differential bus lines against load dump and ESD-induced common-mode surges. Use Value: −65 °C to +175 °C operation supports under-hood placement; ±30 kV ESD rating exceeds ISO 10605 requirements. |
| Ethernet PHY Port Protection | Industrial Sensor Signal Conditioning |
Use Scenario: Shielding 10/100BASE-TX transformer-coupled PHY lines from ESD and induced surges in factory automation equipment. IC Role / Device Role / Timing Role: Single-path TVS on each MDI pair (TX+/TX−, RX+/RX−), mounted adjacent to RJ45 jack. Use Value: 200 W pulse power handles multiple IEC 61000-4-5 surges; low capacitance prevents skew between differential pairs. | Use Scenario: Protecting analog outputs (4–20 mA, 0–10 V) and digital I/O of PLC analog input modules exposed to field wiring transients. IC Role / Device Role / Timing Role: Primary front-end clamp on signal traces entering isolation barrier or ADC front-end. Use Value: 51 V VRWM matches industrial supply rails; 175 °C junction rating ensures reliability in sealed enclosures with thermal buildup. |
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 | Higher clamping voltage (93.6 V), larger SMA (DO-214AC) package (2.79 mm height), 400 W peak power (10/1000 μs). | Less suitable for ultra-low-height designs; better for higher-energy surges where PCB space allows. | Select SMAJ51A-E3/5A only when surge energy exceeds 200 W and board height budget permits ≥2.79 mm profile. |
| TPSMD51A | Same 51 V VRWM and 82.4 V VC, but 600 W peak power (10/1000 μs); SMC (DO-214AB) package (2.3 mm height). | Higher power handling suits industrial motor drives; larger footprint may conflict with dense routing. | Choose TPSMD51A when protecting high-energy nodes like RS-485 trunk lines or power supply inputs where 600 W rating is mandatory. |
Compared with SMAJ51A-E3/5A and TPSMD51A, the SMF51A-HE3_A18 offers the lowest profile (1.08 mm) and tightest capacitance (151 pF), making it optimal for space- and speed-critical interfaces like USB 2.0 and CAN FD-where taller packages risk mechanical interference or signal degradation.
Availability
SMF51A-HE3_A18 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial Ethernet gateways, and medical patient-monitoring interfaces requiring stable component supply across long production lifecycles.
Supply support for SMF51A-HE3_A18 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-designed specifically for AEC-Q101 compliance, low-capacitance signal integrity, and seamless integration into automated SMT lines.
FAQ
What is the clamping voltage of the SMF51A-HE3_A18 at its rated peak pulse current?
The SMF51A-HE3_A18 has a maximum clamping voltage (VC) of 82.4 V when subjected to its rated peak pulse current of 2.4 A using the 10/1000 μs waveform. This value is measured per IEC 61000-4-5 test conditions and ensures protected downstream ICs remain within safe operating limits during surge events. The SMF51A-HE3_A18 achieves this performance while maintaining low incremental surge resistance for minimal overshoot.
Is the SMF51A-HE3_A18 qualified for automotive applications?
Yes, the SMF51A-HE3_A18 is AEC-Q101 qualified and rated for human body model (HBM) Class H3B (> 8 kV). It meets stringent automotive reliability requirements including temperature cycling, humidity testing, and mechanical shock. The SMF51A-HE3_A18 is explicitly intended for use in automotive subsystems such as body electronics, infotainment, and ADAS sensor interfaces where ESD robustness and extended temperature operation (−65 °C to +175 °C) are mandatory.
What package type does the SMF51A-HE3_A18 use, and what are its key mechanical dimensions?
The SMF51A-HE3_A18 uses the DO-219AB (SMF) package: length 3.9 mm, width 1.9 mm, height 1.08 mm max, with cathode marking on the top surface. Its footprint matches SOD-123W and is compatible with standard 0805 land patterns. The SMF51A-HE3_A18's low profile and MSL level 1 rating enable direct placement in high-density layouts without baking or special reflow profiles.
How does the capacitance of the SMF51A-HE3_A18 affect high-speed signal integrity?
The SMF51A-HE3_A18 exhibits 151 pF typical capacitance at 0 V and 1 MHz, which is optimized for interfaces up to 100 Mbps-including USB 2.0 (480 Mbps) and CAN FD (5 Mbps)-without causing measurable rise-time degradation or impedance mismatch. Its capacitance vs. voltage curve shows monotonic decrease above 5 V, further reducing loading at operating bias. The SMF51A-HE3_A18's low capacitance is a deliberate design feature enabling clean signal transmission while retaining robust ESD protection.
Does the SMF51A-HE3_A18 support both contact and air discharge ESD immunity per IEC 61000-4-2?
Yes, the SMF51A-HE3_A18 is rated for ±30 kV contact discharge and ±30 kV air discharge per IEC 61000-4-2, tested with 10 pulses per polarity. This full Level 4 immunity exceeds standard requirements for consumer, industrial, and automotive end equipment. The SMF51A-HE3_A18 achieves this via optimized junction design and low-noise avalanche structure, ensuring consistent performance across repeated ESD events without parameter drift.
SMF51A-HE3_A18 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_A18 FAQ
1.How can I place an order for SMF51A-HE3_A18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF51A-HE3_A18 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_A18 reliable?
The price and inventory of SMF51A-HE3_A18 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_A18 is usually 5 days.
3.What payment methods are accepted for SMF51A-HE3_A18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF51A-HE3_A18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF51A-HE3_A18?
SMF51A-HE3_A18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF51A-HE3_A18 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_A18?
For technical support, including SMF51A-HE3_A18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF51A-HE3_A18 requirements.
6.How does Aetrix verify that SMF51A-HE3_A18 is sourced from the original manufacturer or authorized distributors?
All SMF51A-HE3_A18 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_A18 meets industry standards.
7.What is the process for return or replacement of SMF51A-HE3_A18?
All SMF51A-HE3_A18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF51A-HE3_A18, 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_A18 part is unused and in its original packaging.
Return procedure for SMF51A-HE3_A18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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