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Vishay SMF26A-HE3_A18
- Part No.:
- SMF26A-HE3_A18
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF26A-HE3_A18.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,799
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Product details
Overview
SMF26A-HE3_A18 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 26 V standoff voltage (VRWM), 42.1 V maximum clamping voltage at 4.8 A peak pulse current, and ±30 kV IEC 61000-4-2 ESD immunity - deployed in USB 2.0 interfaces, HDMI signal paths, and industrial sensor I/O protection.
For engineers reviewing the SMF26A-HE3_A18 datasheet, SMF26A-HE3_A18 pinout, SMF26A-HE3_A18 application, or SMF26A-HE3_A18 equivalent, key selection criteria include clamping performance under 10/1000 μs surge, low capacitance (230 pF at 0 V), AEC-Q101 qualification status, and SOD-123W-compatible footprint compatibility with automated assembly.
Technical Context
This device operates as a single-channel unidirectional TVS diode, leveraging silicon avalanche breakdown to clamp transients above its reverse standoff voltage. Its low incremental surge resistance ensures rapid response (<1 ns) and stable clamping across repeated ESD events per IEC 61000-4-2.
Rated for operation from –65 °C to +175 °C and qualified to AEC-Q101, the SMF26A-HE3_A18 supports automotive and industrial environments where thermal cycling and long-term reliability are critical. Its DO-219AB package enables high-density PCB layouts while maintaining MSL level 1 moisture sensitivity compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 26 V - defines maximum continuous operating voltage before clamping begins; sets safe margin below system rail voltage. |
| Clamping Voltage (VC) | 42.1 V at IPPM = 4.8 A (10/1000 μs) - limits downstream IC stress during surge events; critical for protecting 3.3 V or 5 V logic interfaces. |
| Peak Pulse Power | 200 W (10/1000 μs) - sustains short-duration surges without degradation; validated per IEC 61000-4-5 waveform. |
| Capacitance (CD) | 230 pF at VR = 0 V, f = 1 MHz - impacts signal integrity on high-speed lines; suitable for ≤10 Mbps digital interfaces. |
| ESD Immunity | ±30 kV contact / ±30 kV air discharge (IEC 61000-4-2) - exceeds Level 4 requirements; eliminates need for external ESD staging in many designs. |
| Operating Temp Range | –65 °C to +175 °C - supports under-hood automotive, industrial control, and outdoor equipment deployments. |
Pinout & Package
The SMF26A-HE3_A18 uses the DO-219AB (SMF) package: low-profile (1.08 mm max height), SOD-123W-compatible outline, molded in UL 94 V-0 compound, with cathode indicated by a bar marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side of protection path | Connected to protected line (e.g., USB D+); conducts surge current toward ground when clamped. |
| Cathode | Output side / reference node | Connected to system ground; establishes clamping reference and enables unidirectional operation. |
Key Features
| Feature | Design Value |
|---|---|
| "Low Noise" fast-response technology | Sub-nanosecond response time ensures clamping initiates before sensitive ICs experience overvoltage stress. |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness testing. |
| Wave and reflow solderable | Compatible with standard Pb-free reflow profiles up to 260 °C peak; supports high-volume automated assembly. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients, improving clamping predictability and consistency. |
Applications
| USB 2.0 Interface Protection | HDMI Signal Line Protection |
|---|---|
Use Scenario: Protecting USB 2.0 D+ and D– lines against ESD events during hot-plug insertion in portable and automotive infotainment systems. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between data line and chassis ground to shunt ESD energy away from USB transceiver ICs. Use Value: Maintains 480 Mbps signal integrity while suppressing ±30 kV contact discharges - eliminating need for additional RC filtering or layout spacing. |
Use Scenario: Safeguarding HDMI TMDS clock and data channels from ESD in set-top boxes, monitors, and AV receivers exposed to user handling. IC Role / Device Role / Timing Role: Standalone ESD clamp on each differential pair, referenced to local ground plane to preserve common-mode noise rejection. Use Value: 230 pF capacitance avoids signal edge degradation at 165 MHz pixel clock rates; DO-219AB footprint fits tight HDMI connector routing constraints. |
| Industrial Sensor I/O Protection | Automotive CAN FD Transceiver Protection |
Use Scenario: Shielding 4–20 mA analog sensor outputs and digital I²C/SPI buses in factory automation modules subjected to field ESD and cable discharge events. IC Role / Device Role / Timing Role: Point-of-entry transient suppressor on sensor interface traces, placed immediately before connector entry point. Use Value: –65 °C to +175 °C operating range ensures functionality in unheated enclosures; 26 V VRWM aligns with 24 V industrial supply rails. |
Use Scenario: Secondary-level ESD protection on CAN FD bus lines (CANH/CANL) in body control modules and ADAS domain controllers. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to vehicle ground, installed after primary common-mode choke to avoid interference with differential signaling. Use Value: AEC-Q101 qualification confirms suitability for automotive environments; 42.1 V VC prevents false triggering during CAN bus recessive-to-dominant transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26A-E3/57T | Higher clamping voltage (47.1 V at 5.2 A), SMA package (larger footprint, 2.4 mm height), same VRWM. | Less suitable for space-constrained layouts; higher thermal resistance reduces power handling in dense PCBs. | Select when legacy SMA footprint compatibility is required and board area permits larger package. |
| TPD2E001DRYR | 2-channel bidirectional array (0.85 pF/channel), 26 V VRWM, but rated only to ±8 kV IEC 61000-4-2. | Designed for ultra-high-speed USB 3.0/PCIe; insufficient for automotive-grade ±30 kV ESD requirements. | Choose only for non-automotive, high-frequency applications where sub-pF capacitance outweighs ESD robustness needs. |
Compared with SMAJ26A-E3/57T and TPD2E001DRYR, the SMF26A-HE3_A18 delivers optimal balance of compact DO-219AB packaging, full ±30 kV ESD immunity, and automotive-qualified reliability - making it preferred for new designs targeting IPC Class 3 or AEC-Q101 compliance.
Availability
SMF26A-HE3_A18 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI signal line safeguarding, and industrial sensor I/O requiring stable component supply across automotive Tier-1, industrial OEM, and medical device production programs.
Supply support for SMF26A-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 high-speed data line protection with optimized clamping, low capacitance, and AEC-Q101 qualification - engineered specifically for USB, HDMI, DisplayPort, and industrial serial interface applications demanding robust ESD resilience.
FAQ
What is the maximum clamping voltage of the SMF26A-HE3_A18 under standard test conditions?
The SMF26A-HE3_A18 has a maximum clamping voltage (VC) of 42.1 V when subjected to a 10/1000 μs surge waveform at 4.8 A peak pulse current. This value is measured per IEC 61000-4-5 and ensures predictable overvoltage limiting for downstream 3.3 V or 5 V logic circuits. The SMF26A-HE3_A18 maintains this clamping performance across its full operating temperature range.
Is the SMF26A-HE3_A18 qualified to AEC-Q101, and what does that mean for automotive use?
Yes, the SMF26A-HE3_A18 is AEC-Q101 qualified, confirming it meets rigorous stress tests for automotive applications including temperature cycling, highly accelerated life testing (HALT), and ESD robustness. This qualification validates its suitability for under-hood and cabin modules where reliability over 15+ years is mandatory. The SMF26A-HE3_A18's –65 °C to +175 °C operating range further supports deployment in harsh automotive environments.
How does the 230 pF capacitance of the SMF26A-HE3_A18 affect high-speed signal integrity?
The SMF26A-HE3_A18's typical capacitance of 230 pF at 0 V reverse bias is optimized for data rates up to 10 Mbps - appropriate for USB 2.0 full-speed (12 Mbps) and industrial I²C/SPI interfaces. While not suited for USB 3.0 or PCIe, this capacitance avoids excessive signal rise-time degradation or reflection in medium-speed applications. The SMF26A-HE3_A18's low incremental surge resistance helps maintain consistent clamping without introducing timing jitter.
Can the SMF26A-HE3_A18 be used in bidirectional signal paths like RS-485 or CAN?
No - the SMF26A-HE3_A18 is a unidirectional TVS diode, designed for protection on single-ended lines referenced to ground (e.g., USB D+, HDMI TMDS+). For bidirectional differential buses like RS-485 or CAN, a symmetric bidirectional TVS or dedicated dual-rail clamp is required. Using the SMF26A-HE3_A18 on such lines would only protect one polarity and risk damage during negative transients. The SMF26A-HE3_A18 must be applied per channel with correct anode/cathode orientation.
What is the recommended PCB footprint and soldering profile for the SMF26A-HE3_A18?
The SMF26A-HE3_A18 uses the DO-219AB (SMF) package with standardized SOD-123W-compatible dimensions: 3.9 mm × 1.9 mm × 1.08 mm. Vishay recommends a footprint with 1.3 mm pad length, 1.4 mm pad width, and 2.9 mm center-to-center spacing. Reflow soldering follows J-STD-020 MSL level 1 guidelines, with peak temperature ≤260 °C. The SMF26A-HE3_A18 supports both wave and reflow processes without derating.
SMF26A-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):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 4.8A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 230pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF26A-HE3_A18 FAQ
1.How can I place an order for SMF26A-HE3_A18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF26A-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 SMF26A-HE3_A18 reliable?
The price and inventory of SMF26A-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 SMF26A-HE3_A18 is usually 5 days.
3.What payment methods are accepted for SMF26A-HE3_A18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF26A-HE3_A18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF26A-HE3_A18?
SMF26A-HE3_A18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF26A-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 SMF26A-HE3_A18?
For technical support, including SMF26A-HE3_A18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF26A-HE3_A18 requirements.
6.How does Aetrix verify that SMF26A-HE3_A18 is sourced from the original manufacturer or authorized distributors?
All SMF26A-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 SMF26A-HE3_A18 meets industry standards.
7.What is the process for return or replacement of SMF26A-HE3_A18?
All SMF26A-HE3_A18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF26A-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 SMF26A-HE3_A18 part is unused and in its original packaging.
Return procedure for SMF26A-HE3_A18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF26A-HE3_A18 Tags
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