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Vishay General Semiconductor - Diodes Division SMF26A-E3-18
- Part No.:
- SMF26A-E3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF26A-E3-18.pdf
- Description:
- TVS DIODE 26VWM 42.1VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:44,391
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Product details
Overview
SMF26A-E3-18 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for clamping transient overvoltages on signal or power lines. It features a 26 V stand-off voltage (VRWM), 42.1 V maximum reverse clamping voltage at 4.8 A peak pulse current, 230 pF typical capacitance at 0 V, ±30 kV IEC 61000-4-2 ESD immunity, and 200 W peak pulse power (10/1000 μs). It is used in USB 2.0 data lines, HDMI interfaces, and industrial sensor I/O protection.
For engineers reviewing the SMF26A-E3-18 datasheet, SMF26A-E3-18 pinout, SMF26A-E3-18 application, or SMF26A-E3-18 equivalent, this device is selected for high-reliability transient suppression where low clamping voltage, fast response, and AEC-Q101 qualification are required - especially in automotive infotainment and industrial control I/O stages with strict ESD robustness mandates.
Technical Context
The SMF26A-E3-18 operates as a single-channel unidirectional TVS diode, leveraging silicon avalanche breakdown to clamp transients above its 28.9 V minimum breakdown voltage. Its low incremental surge resistance ensures minimal voltage overshoot during fast ESD events (0.7–1 ns rise time), while its 230 pF junction capacitance supports signal integrity up to ~100 MHz in protected lines.
It is rated for operation from –65 °C to +175 °C, qualified to AEC-Q101, and compatible with reflow soldering per J-STD-020 MSL level 1 (peak 260 °C). The DO-219AB package provides 1.08 mm height and 3.9 mm × 1.9 mm footprint - optimized for space-constrained PCB layouts requiring wave or reflow assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 26 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below system rail. |
| Breakdown Voltage (VBR) | 28.9–32.0 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering above VRWM with design margin. |
| Clamping Voltage (VC) | 42.1 V at 4.8 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge; determines downstream component stress. |
| Junction Capacitance (CD) | 230 pF at 0 V, 1 MHz - Impacts high-speed signal integrity; suitable for USB 2.0 (480 Mbps) but not USB 3.x or PCIe Gen3. |
| ESD Withstand | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - Meets highest industrial and automotive ESD immunity requirements without external filtering. |
| Peak Pulse Power | 200 W (10/1000 μs) - Sustains short-duration surges common in I/O port ESD events; derates linearly above 25 °C ambient. |
| Operating Temperature | –65 °C to +175 °C - Enables deployment in under-hood automotive, industrial motor drives, and outdoor equipment. |
Pinout & Package
The SMF26A-E3-18 uses the DO-219AB (SMF) package: low-profile, surface-mount, cathode-marked with a bar. Dimensions: 3.9 mm × 1.9 mm × 1.08 mm. Compatible with SOD-123W footprint layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side (protected path) | Connected to signal/power line requiring ESD protection; referenced to system ground via cathode. |
| Cathode | Ground reference terminal | Must be routed to low-impedance system ground plane; determines clamping reference and affects ESD return path inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Low clamping voltage | 42.1 V at 4.8 A enables protection of 3.3 V–24 V logic and analog ICs without overstressing downstream components. |
| AEC-Q101 qualification | Validated for automotive applications including infotainment, body control modules, and ADAS sensor interfaces. |
| "Low Noise" fast response | Sub-nanosecond turn-on minimizes voltage overshoot during ESD events, critical for high-speed digital interface protection. |
| Solder-compatible packaging | DO-219AB meets J-STD-020 MSL level 1 and supports both wave and reflow soldering without moisture sensitivity concerns. |
| High ESD immunity | ±30 kV contact/air rating exceeds IEC 61000-4-2 Level 4 - eliminates need for secondary ESD mitigation in most designs. |
Applications
| USB 2.0 Data Lines | HDMI Interface Protection |
|---|---|
Use Scenario: Protecting D+ and D− differential pairs in embedded host/device ports against ESD during hot-plug and handling. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between each data line and ground, clamping transients before they reach USB transceiver ICs. Use Value: Maintains signal integrity with 230 pF capacitance while ensuring ±30 kV ESD robustness - compliant with USB-IF ESD test requirements. |
Use Scenario: Safeguarding TMDS clock and data channels in consumer displays and set-top boxes exposed to user-accessible connectors. IC Role / Device Role / Timing Role: Single-channel clamping device on each TMDS lane, referenced to chassis or digital ground to suppress coupling-induced surges. Use Value: 42.1 V clamping voltage prevents damage to HDMI receiver ICs rated for ≤5.5 V absolute max, with no added jitter from excessive capacitance. |
| Automotive Sensor I/O | Industrial PLC Analog Inputs |
Use Scenario: Protecting LIN bus or CAN FD transceiver I/O pins in vehicle cabin sensors (e.g., seat occupancy, ambient light) subject to cable discharge events. IC Role / Device Role / Timing Role: Standoff-rated TVS on bidirectional signal lines, leveraging unidirectional configuration with proper grounding to avoid forward conduction during normal operation. Use Value: AEC-Q101 qualification and –65 °C to +175 °C operation ensure reliability across full automotive temperature range without derating. |
Use Scenario: Shielding 4–20 mA current loop or 0–10 V analog inputs in programmable logic controllers from field wiring ESD and inductive switching transients. IC Role / Device Role / Timing Role: Primary front-end transient suppressor mounted directly at connector entry point, shunting energy to ground before reaching precision ADC or op-amp front-end. Use Value: 26 V VRWM aligns with common industrial supply rails; 200 W pulse rating handles repetitive surge events in factory-floor environments. |
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 | Same VRWM (26 V) and VC (42.1 V), but SMA (DO-214AC) package - 4.5 mm × 2.7 mm, 2.3 mm height; higher thermal resistance (RthJA = 40°C/W vs. 180 K/W). | Less suitable for ultra-thin or high-density layouts; better for higher-power dissipation in non-space-constrained designs. | Select SMAJ26A-E3/57T only if board real estate allows larger footprint and thermal management prioritizes junction-to-ambient conduction over compactness. |
| TPD2E001DRYR | 2-channel, 15 pF, 12 V VRWM - significantly lower capacitance and standoff, but not AEC-Q101 qualified; requires dual-diode configuration for unidirectional protection. | Targeted at high-speed USB 2.0 or MIPI lanes where <20 pF is mandatory; unsuitable for 24 V industrial or automotive power-line protection. | Choose TPD2E001DRYR only when protecting sub-5 V high-frequency signals where SMF26A-E3-18's 230 pF would degrade eye diagram margin. |
Compared with SMAJ26A-E3/57T and TPD2E001DRYR, SMF26A-E3-18 uniquely balances AEC-Q101 compliance, compact DO-219AB packaging, and 26 V system-level protection - making it optimal for automotive and industrial edge nodes where size, reliability, and voltage rating must coexist.
Availability
SMF26A-E3-18 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC analog I/O modules, and USB 2.0 peripheral designs requiring stable component supply and long-term lifecycle support.
Supply support for SMF26A-E3-18 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 power management, sensing, and protection devices with emphasis on reliability, efficiency, and automotive-grade qualification.
The SMF series targets high-reliability ESD protection for automotive, industrial, and computing interfaces - engineered for robust transient suppression in harsh environments with minimal PCB footprint.
FAQ
What is the maximum clamping voltage of the SMF26A-E3-18 under standard test conditions?
The SMF26A-E3-18 has a maximum reverse clamping voltage (VC) of 42.1 V when subjected to a 4.8 A peak pulse current with a 10/1000 μs waveform. This value is measured at 25 °C and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring compatibility with downstream ICs rated for ≤45 V absolute maximum.
Is the SMF26A-E3-18 suitable for automotive applications?
Yes, the SMF26A-E3-18 is AEC-Q101 qualified and rated for operation from –65 °C to +175 °C, making it suitable for automotive use cases including infotainment interfaces, body control modules, and sensor I/O protection. Its ±30 kV ESD immunity and DO-219AB package meet stringent automotive layout and reliability requirements.
What does the "E3-18" suffix indicate in SMF26A-E3-18?
The "E3" denotes lead (Pb)-free, RoHS-compliant terminations with matte tin plating; "18" specifies packaging in 10 k per 13″ reel (8 mm tape), with a minimum order quantity of 50 k units. This format ensures compatibility with high-volume SMT assembly lines and supports traceable, controlled moisture handling per J-STD-020 MSL level 1.
How does the 230 pF capacitance of SMF26A-E3-18 affect high-speed signal lines?
The SMF26A-E3-18's 230 pF typical junction capacitance at 0 V limits its use to signal lines operating up to ~100 MHz - appropriate for USB 2.0 (480 Mbps) and RS-485, but not for USB 3.x, HDMI 2.0, or PCIe Gen3. Designers must verify eye diagram integrity and insertion loss when integrating SMF26A-E3-18 into high-speed paths.
Can SMF26A-E3-18 be used in bidirectional signal protection?
No - SMF26A-E3-18 is a unidirectional TVS diode, intended for protection of DC-biased or ground-referenced lines. For truly bidirectional signals (e.g., USB D+/D− without DC bias), a symmetric dual-diode array like SMAJ26CA or dedicated bidirectional TVS must be used instead of SMF26A-E3-18.
SMF26A-E3-18 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):
- 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:
- General Purpose
- Capacitance @ Frequency:
- 230pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF26A-E3-18 FAQ
1.How can I place an order for SMF26A-E3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF26A-E3-18 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-E3-18 reliable?
The price and inventory of SMF26A-E3-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF26A-E3-18 is usually 5 days.
3.What payment methods are accepted for SMF26A-E3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF26A-E3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF26A-E3-18?
SMF26A-E3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF26A-E3-18 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-E3-18?
For technical support, including SMF26A-E3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF26A-E3-18 requirements.
6.How does Aetrix verify that SMF26A-E3-18 is sourced from the original manufacturer or authorized distributors?
All SMF26A-E3-18 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-E3-18 meets industry standards.
7.What is the process for return or replacement of SMF26A-E3-18?
All SMF26A-E3-18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF26A-E3-18, 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-E3-18 part is unused and in its original packaging.
Return procedure for SMF26A-E3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF26A-E3-18 Tags
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