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Vishay General Semiconductor - Diodes Division SMF26A-HM3-18
- Part No.:
- SMF26A-HM3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF26A-HM3-18.pdf
- Description:
- TVS DIODE 26VWM 42.1VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:5,921
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Product details
Overview
SMF26A-HM3-18 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 stand-off voltage (VRWM), 42.1 V maximum clamping voltage at 4.8 A peak pulse current (10/1000 μs), 230 pF typical junction capacitance at 0 V, ±30 kV IEC 61000-4-2 ESD immunity, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SMF26A-HM3-18 datasheet, SMF26A-HM3-18 pinout, SMF26A-HM3-18 application, or SMF26A-HM3-18 equivalent, this device is selected for robust electrostatic discharge protection in USB 2.0, HDMI, automotive infotainment interfaces, and industrial sensor signal conditioning where low clamping voltage and fast response time are critical.
Technical Context
This diode operates as a unidirectional TVS (Transient Voltage Suppressor) with avalanche breakdown behavior, triggered when reverse voltage exceeds its 28.9–32.0 V breakdown range (VBR). Its low incremental surge resistance ensures minimal voltage overshoot during transient events, while the "Low Noise" technology enables sub-nanosecond response to ESD pulses.
The device is optimized for placement directly at I/O connectors or IC pins to shunt ESD energy to ground before it reaches sensitive circuitry. Its SOD-123W-compatible DO-219AB package supports wave and reflow soldering, with MSL Level 1 moisture sensitivity and peak reflow temperature up to 260 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 26 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system operating margin. |
| Clamping Voltage (VC) | 42.1 V max at IPPM = 4.8 A (10/1000 μs) - Limits voltage seen by protected IC during surge; critical for 3.3 V/5 V interface survival. |
| Junction 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 Rating | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - Meets highest industrial and automotive ESD immunity requirements. |
| AEC-Q101 Qualified | Yes - Validated for automotive underhood and cabin applications per stress test conditions including HBM >8 kV. |
| Package | DO-219AB (SOD-123W compatible) - 3.9 mm × 1.9 mm × 1.08 mm low-profile footprint; enables dense PCB layout near connectors. |
| Peak Pulse Power | 200 W (10/1000 μs), 1000 W (8/20 μs) - Supports multi-pulse surge events per IEC 61000-4-5; defines single-event energy handling. |
Pinout & Package
SMF26A-HM3-18 uses a 2-terminal DO-219AB (SOD-123W-compatible) surface-mount package with cathode marked by a bar. The device has no internal complexity-only anode and cathode terminals forming a single PN junction for unidirectional clamping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side terminal | Connected to protected signal line or power rail; conducts surge current toward cathode during overvoltage. |
| Cathode | Ground-reference terminal | Connected to system ground; establishes clamping reference and provides low-impedance path for transient energy dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables reliable suppression of common ESD and lightning-induced surges without thermal runaway in compact layouts. |
| ±30 kV ESD immunity (IEC 61000-4-2) | Exceeds Level 4 immunity requirements for industrial and automotive end-equipment without external shielding. |
| AEC-Q101 qualified | Validates reliability for automotive applications including infotainment, body control modules, and ADAS sensor interfaces. |
| Low-profile DO-219AB package | Reduces board space vs. SMA/SMB; maintains mechanical robustness and thermal performance in automated assembly. |
| 230 pF junction capacitance | Minimizes signal distortion on medium-speed buses (e.g., CAN FD, RS-485, UART), preserving rise/fall time integrity. |
Applications
| Automotive Infotainment Interface | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Protecting HDMI, USB 2.0, or LVDS video/data lines between head unit and display in vehicles exposed to ESD during service or operation. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed at connector entry point to clamp transients before reaching serializer/deserializer ICs. Use Value: Prevents latch-up or damage to 3.3 V logic inputs while maintaining <1 ns response time and <42.1 V clamping threshold. |
Use Scenario: Shielding analog outputs (4–20 mA, 0–10 V) and digital I²C/SPI lines of pressure, temperature, or position sensors in factory automation equipment. IC Role / Device Role / Timing Role: Standoff-clamp protector on sensor output traces, referenced to local ground plane to suppress coupling from motor drives or relay switching. Use Value: Ensures signal fidelity during 8/20 μs surge events up to 1000 W, with leakage <0.1 μA at 26 V to avoid measurement drift. |
| USB 2.0 Port Protection | Power Rail Transient Suppression |
|
Use Scenario: Safeguarding D+ and D− lines of embedded USB host/device ports in medical devices, POS terminals, and kiosks subject to frequent human contact. IC Role / Device Role / Timing Role: Dual-diode configuration (one per line) with cathodes tied to ground, providing symmetrical clamping for differential signaling. Use Value: Maintains 230 pF capacitance per line to preserve 480 Mbps data integrity while meeting IEC 61000-4-2 ±30 kV compliance. |
Use Scenario: Protecting 24 V DC input rails in PLC I/O modules against load dump and inductive switching spikes in industrial control cabinets. IC Role / Device Role / Timing Role: Parallel-connected TVS on power entry, sized to absorb 200 W (10/1000 μs) surges without degrading upstream fuse or regulator. Use Value: Clamps 24 V rail to ≤42.1 V during transient, preventing overvoltage shutdown of downstream 3.3 V/5 V regulators and microcontrollers. |
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), higher VC (45.7 V), larger SMA package (4.5 mm × 2.7 mm), 600 W (10/1000 μs) rating. | Better suited for higher-energy surges but less space-efficient; higher capacitance (350 pF) limits high-speed use. | Select SMAJ26A-E3/57T only if board area permits and surge energy exceeds 200 W capability of SMF26A-HM3-18. |
| TPD2E001DRYR | Lower VRWM (5.5 V), dual-channel, 12 pF capacitance, integrated ESD array for USB D+/D−; not unidirectional or AEC-Q101 rated. | Designed for low-voltage, high-speed data lines-not for 24–26 V power or signal rails requiring automotive qualification. | Choose TPD2E001DRYR for USB 2.0 data-line protection in consumer electronics; not a functional substitute for SMF26A-HM3-18's 26 V rail protection role. |
Compared with SMAJ26A-E3/57T and TPD2E001DRYR, SMF26A-HM3-18 uniquely balances AEC-Q101 qualification, 26 V standoff, compact DO-219AB footprint, and 230 pF capacitance-making it optimal for space-constrained automotive and industrial 24 V interface protection where both reliability and signal integrity matter.
Availability
SMF26A-HM3-18 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor nodes, and USB 2.0 peripheral designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant, lead-free terminations.
Supply support for SMF26A-HM3-18 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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SMF series targets high-speed, space-constrained ESD protection applications, emphasizing AEC-Q101 qualification, low clamping voltage, and compatibility with modern SMT processes-designed specifically for automotive and industrial interface hardening.
FAQ
What is the clamping voltage of SMF26A-HM3-18 under standard surge conditions?
The SMF26A-HM3-18 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 the device terminals and defines the upper voltage limit imposed on protected circuits during transient events, ensuring compatibility with 3.3 V and 5 V logic interfaces.
Is SMF26A-HM3-18 qualified for automotive applications?
Yes, SMF26A-HM3-18 is AEC-Q101 qualified, having passed stress tests including human body model (HBM) ESD >8 kV and temperature cycling. Its DO-219AB package, -65 °C to +175 °C operating range, and IEC 61000-4-2 ±30 kV rating make it suitable for under-hood and cabin automotive systems such as infotainment and sensor interfaces.
What does the "HM3-18" suffix indicate in SMF26A-HM3-18?
The "HM3-18" suffix denotes Vishay's packaging and environmental coding: "H" indicates AEC-Q101 qualification, "M3" specifies lead (Pb)-free, tin-plated terminations, and "18" means 10,000 units per 13″ reel (8 mm tape). This matches the ordering code SMF26A-HE3_A18 in Vishay's documentation.
Can SMF26A-HM3-18 be used for bidirectional protection?
No, SMF26A-HM3-18 is a unidirectional TVS diode intended for DC-biased lines like power rails or single-ended signals referenced to ground. For bidirectional protection (e.g., AC-coupled data lines), a symmetric device such as SMBJ26A or dedicated dual-rail arrays would be required instead.
What is the thermal resistance (RthJA) of SMF26A-HM3-18 on a standard PCB?
The junction-to-ambient thermal resistance (RthJA) of SMF26A-HM3-18 is 180 K/W when mounted on an epoxy-glass PCB with 3 mm × 3 mm copper pads ≥40 μm thick. This value guides thermal design for repeated surge events and confirms suitability for natural-convection cooling in most industrial and automotive layouts.
SMF26A-HM3-18 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:
- -
- Capacitance @ Frequency:
- 230pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF26A-HM3-18 FAQ
1.How can I place an order for SMF26A-HM3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF26A-HM3-18 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-HM3-18 reliable?
The price and inventory of SMF26A-HM3-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF26A-HM3-18 is usually 5 days.
3.What payment methods are accepted for SMF26A-HM3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF26A-HM3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF26A-HM3-18?
SMF26A-HM3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF26A-HM3-18 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-HM3-18?
For technical support, including SMF26A-HM3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF26A-HM3-18 requirements.
6.How does Aetrix verify that SMF26A-HM3-18 is sourced from the original manufacturer or authorized distributors?
All SMF26A-HM3-18 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-HM3-18 meets industry standards.
7.What is the process for return or replacement of SMF26A-HM3-18?
All SMF26A-HM3-18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF26A-HM3-18, 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-HM3-18 part is unused and in its original packaging.
Return procedure for SMF26A-HM3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF26A-HM3-18 Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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