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Vishay General Semiconductor - Diodes Division SMF26A-M3-18
- Part No.:
- SMF26A-M3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF26A-M3-18.pdf
- Description:
- TVS DIODE 26VWM 42.1VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:3,229
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Product details
Overview
SMF26A-M3-18 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 and power rails. It features a 26 V standoff voltage (VRWM), 42.1 V maximum 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 rating with 10/1000 μs waveform - deployed in automotive infotainment USB interfaces.
For engineers reviewing the SMF26A-M3-18 datasheet, SMF26A-M3-18 pinout, SMF26A-M3-18 application, or SMF26A-M3-18 equivalent, key selection criteria include clamping voltage vs. protected IC's absolute maximum ratings, capacitance impact on signal integrity (e.g., USB 2.0 eye diagram margin), thermal resistance (180 K/W), AEC-Q101 qualification status, and SOD-123W-compatible footprint compatibility.
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 voltage limiting during ESD events, while "Low Noise" technology delivers sub-nanosecond response time critical for protecting high-speed interfaces.
The SMF26A-M3-18 is optimized for board-level ESD hardening per IEC 61000-4-2 and surge immunity per IEC 61000-4-5 (8/20 μs, 1000 W). It supports wave and reflow soldering, complies with AEC-Q101 Class H3B (>8 kV HBM), and is rated for continuous operation from –65 °C to +175 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 26 V - maximum continuous reverse operating voltage before significant leakage; sets minimum system rail margin for reliable clamping. |
| Clamping Voltage (VC) | 42.1 V at IPPM = 4.8 A (10/1000 μs) - peak voltage seen by protected circuit during worst-case surge; must stay below downstream IC's absolute max rating. |
| Capacitance (CD) | 230 pF at VR = 0 V, f = 1 MHz - directly impacts signal rise/fall times; suitable for ≤10 Mbps digital lines but not USB 3.0 or HDMI. |
| ESD Rating | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - exceeds industrial and automotive ESD immunity requirements without external shielding. |
| Peak Pulse Power | 200 W (10/1000 μs), 1000 W (8/20 μs) - defines energy-handling capability for lightning-induced surges and EFT bursts. |
| Thermal Resistance | 180 K/W (RthJA, 3 mm × 3 mm Cu pads) - determines steady-state power dissipation limit; requires adequate PCB copper area for sustained surge duty. |
Pinout & Package
SMF26A-M3-18 uses the DO-219AB (SMF) package: low-profile (1.08 mm height), 3.9 mm × 1.9 mm footprint, cathode-bar marked terminal, compatible with SOD-123W, SOD-123F, and SOD-123FL land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side of protected line (e.g., USB D+) | Connected to signal/power source; reverse-biased under normal operation; conducts only during overvoltage events. |
| Cathode | Return path to ground or lower-potential rail | Provides low-impedance discharge path to GND during ESD/surge; must be routed with minimal inductance to preserve clamping performance. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables robust protection against repetitive ESD and surge events in automotive and industrial environments without thermal runaway. |
| ±30 kV IEC 61000-4-2 ESD immunity | Eliminates need for secondary ESD mitigation layers in front-end interfaces, reducing BOM count and layout complexity. |
| AEC-Q101 qualified (H3B class) | Validated for automotive under-hood and infotainment applications requiring >8 kV HBM reliability across temperature and lifetime. |
| 230 pF capacitance at 0 V | Preserves signal integrity on medium-speed buses (e.g., CAN FD, RS-485, UART) without excessive jitter or attenuation. |
| DO-219AB (SMF) package | Enables automated placement and reflow compatibility while maintaining 1.08 mm profile for space-constrained modules like telematics units. |
Applications
| Automotive Infotainment USB 2.0 | Industrial CAN FD Interface |
|---|---|
Use Scenario: Protecting USB 2.0 D+/D− lines in head unit docking ports exposed to user-handled ESD events. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between connector and USB transceiver IC (e.g., TUSB2036). Use Value: Clamps 30 kV contact discharge to <42.1 V within nanoseconds, preserving transceiver functionality without signal distortion (230 pF adds <1% rise-time degradation). |
Use Scenario: Safeguarding CAN FD physical layer (e.g., TCAN1042) against load dump and ESD in factory automation nodes. IC Role / Device Role / Timing Role: Standoff-clamp TVS on CAN_H/CAN_L differential pair, referenced to chassis ground. Use Value: Maintains 26 V standoff to avoid interference with 12 V nominal bus; 42.1 V clamping prevents CAN controller latch-up during 10/1000 μs surges. |
| Medical Patient Monitor Serial Port | Smart Meter RS-485 Communication |
Use Scenario: Shielding UART lines connecting microcontroller to touch-screen controller in Class II medical devices. IC Role / Device Role / Timing Role: Single-line unidirectional suppressor on TX/RX paths, grounded via short trace to isolated earth plane. Use Value: Meets IEC 60601-1-2 ESD requirements with no added latency; 230 pF capacitance avoids violating 3 Mbps UART timing budgets. |
Use Scenario: Transient protection on RS-485 A/B lines in outdoor smart meters subject to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional protection implemented using two SMF26A-M3-18 diodes (anode-to-anode) across differential pair. Use Value: Delivers 1000 W (8/20 μs) surge handling per line while maintaining 26 V common-mode standoff - compatible with ISO 61000-4-5 Level 3 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26A-E3/57T | Higher clamping voltage (47.1 V), larger SMA (DO-214AC) package (2.5 mm height), 270 pF capacitance. | Less suitable for ultra-thin modules; higher VC may exceed protected IC's voltage tolerance in tight-margin designs. | Prefer SMF26A-M3-18 where board height <1.1 mm or clamping voltage margin is <5 V. |
| TPD2E001DRYR | 2-channel, 15 pF, 12 V VRWM, integrated ESD array; not AEC-Q101 qualified; 30 kV ESD rating. | Designed for high-speed digital I/O (e.g., HDMI, USB 2.0), not power-line or high-voltage bus protection. | Choose SMF26A-M3-18 for standalone 26 V rail protection with AEC-Q101 validation and higher surge power handling. |
Compared with SMAJ26A-E3/57T and TPD2E001DRYR, SMF26A-M3-18 offers the lowest profile, tightest clamping (42.1 V), and automotive-grade qualification - making it optimal for space-constrained, high-reliability 26 V system protection where surge energy and thermal management are critical.
Availability
SMF26A-M3-18 is available at Aetrix Electronics and suitable for automotive infotainment, industrial CAN FD nodes, medical patient monitors, and smart meter RS-485 interfaces requiring stable component supply and long-term lifecycle support.
Supply support for SMF26A-M3-18 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 Intertechnology is a global semiconductor manufacturer specializing in discrete components, sensors, and passive elements, with leadership in power management, signal conditioning, and protection technologies.
The SMF series targets board-level ESD and surge protection in automotive, industrial, and medical systems, emphasizing AEC-Q101 reliability, low-profile packaging, and precise clamping performance for sensitive high-speed interfaces.
FAQ
What is the maximum clamping voltage of SMF26A-M3-18 under standard test conditions?
The SMF26A-M3-18 has a maximum clamping voltage (VC) of 42.1 V when subjected to a 10/1000 μs waveform at 4.8 A peak pulse current. This value is measured per IEC 61000-4-5 and defines the upper voltage limit imposed on protected circuitry during surge events. The clamping behavior is repeatable and validated across the full operating temperature range of –65 °C to +175 °C.
Is SMF26A-M3-18 qualified to AEC-Q101, and what does that qualification cover?
Yes, SMF26A-M3-18 is AEC-Q101 qualified per Class H3B for human body model (HBM) ESD immunity exceeding 8 kV. This qualification includes stress testing for temperature cycling, humidity bias, mechanical shock, and high-temperature operating life - confirming suitability for automotive under-hood and cabin applications. The qualification applies specifically to the SMF26A variant in DO-219AB packaging.
What is the capacitance of SMF26A-M3-18, and how does it affect high-speed signal lines?
The SMF26A-M3-18 exhibits 230 pF typical capacitance at 0 V reverse bias and 1 MHz frequency. This value increases slightly at lower reverse voltages but remains stable above 5 V. For signal lines, this capacitance limits use to ≤10 Mbps applications (e.g., UART, RS-485, CAN FD); it is not recommended for USB 3.0 or HDMI due to eye diagram closure risk.
Can SMF26A-M3-18 be used for bidirectional protection, and if so, how?
SMF26A-M3-18 is a unidirectional device, but bidirectional protection can be achieved by connecting two units anode-to-anode across a differential pair (e.g., RS-485 A/B). This configuration provides symmetrical clamping to ±26 V standoff and ±42.1 V clamping, matching the requirements of ISO 61000-4-5 Level 3 surge testing for industrial communication interfaces.
What is the thermal resistance (RthJA) of SMF26A-M3-18, and how should PCB layout accommodate it?
The SMF26A-M3-18 has a junction-to-ambient thermal resistance (RthJA) of 180 K/W when mounted on a standard epoxy-glass PCB with 3 mm × 3 mm copper pads ≥40 μm thick. To maintain safe junction temperatures during repeated surges, designers must provide at least 3 mm² of 1-oz copper connected to each terminal, avoid thermal isolation, and ensure airflow or adjacent heat sinking if duty cycle exceeds 0.01%.
SMF26A-M3-18 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-M3-18 FAQ
1.How can I place an order for SMF26A-M3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF26A-M3-18 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-M3-18 reliable?
The price and inventory of SMF26A-M3-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF26A-M3-18 is usually 5 days.
3.What payment methods are accepted for SMF26A-M3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF26A-M3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF26A-M3-18?
SMF26A-M3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF26A-M3-18 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-M3-18?
For technical support, including SMF26A-M3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF26A-M3-18 requirements.
6.How does Aetrix verify that SMF26A-M3-18 is sourced from the original manufacturer or authorized distributors?
All SMF26A-M3-18 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-M3-18 meets industry standards.
7.What is the process for return or replacement of SMF26A-M3-18?
All SMF26A-M3-18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF26A-M3-18, 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-M3-18 part is unused and in its original packaging.
Return procedure for SMF26A-M3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF26A-M3-18 Tags
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