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Vishay SMF26A-HM3_A08
- Part No.:
- SMF26A-HM3_A08
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF26A-HM3_A08.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,392
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Product details
Overview
SMF26A-HM3_A08 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, ±30 kV IEC 61000-4-2 ESD immunity, and 200 W peak pulse power (10/1000 μs). It is used in USB 2.0, HDMI, and industrial sensor interfaces requiring robust electrostatic discharge protection.
For engineers reviewing the SMF26A-HM3_A08 datasheet, SMF26A-HM3_A08 pinout, SMF26A-HM3_A08 application, or SMF26A-HM3_A08 equivalent, key selection criteria include clamping voltage under 4.8 A surge, low 230 pF capacitance at 0 V, AEC-Q101 qualification status, SOD-123W-compatible footprint, and thermal resistance of 180 K/W on standard PCB mounting.
Technical Context
This device operates as a unidirectional TVS diode with avalanche breakdown behavior, optimized for fast response to ESD transients via "Low Noise" silicon technology. Its junction temperature range spans −65 °C to +175 °C, and it meets IEC 61000-4-2 (±30 kV contact/air) and AEC-Q101 Class H3B (>8 kV HBM) requirements.
The SMF26A-HM3_A08 uses a planar epitaxial construction with low incremental surge resistance to ensure stable clamping performance across repeated surges. Its DO-219AB package supports wave and reflow soldering per J-STD-020 MSL level 1, with peak temperature tolerance up to 260 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 26 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin for protected line. |
| Clamping Voltage (VC) | 42.1 V at IPPM = 4.8 A - Peak voltage seen by downstream circuit during 10/1000 μs surge; limits stress on IC inputs. |
| Peak Pulse Power | 200 W (10/1000 μs) - Sustains defined transient energy without failure; enables protection of medium-energy interfaces. |
| Capacitance (CD) | 230 pF at VR = 0 V, f = 1 MHz - Low enough for USB 2.0 (480 Mbps) signal integrity; avoids excessive signal attenuation. |
| ESD Immunity | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - Meets highest industrial and automotive ESD test levels without degradation. |
| Thermal Resistance (RthJA) | 180 K/W - Predictable junction-to-ambient rise under surge; informs PCB copper pad sizing for reliability. |
| Operating Temperature | −65 °C to +175 °C - Supports extended-range applications including under-hood automotive and industrial control cabinets. |
Pinout & Package
SMF26A-HM3_A08 is housed in the DO-219AB (SMF) package - a low-profile, surface-mount case compatible with SOD-123W, SOD-123F, and SOD-123FL footprints. Dimensions: 3.9 mm × 1.9 mm × 1.08 mm (L × W × H), with cathode marked by a bar on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Protected Line Connection | Connected to signal line requiring ESD protection; conducts during reverse transient to shunt current to ground. |
| Cathode | Ground Reference Terminal | Connected to system ground plane; establishes reference for clamping action and provides low-inductance return path. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W Peak Pulse Power (10/1000 μs) | Enables reliable suppression of common industrial surge events without thermal runaway or parametric shift. |
| ±30 kV ESD Immunity (IEC 61000-4-2) | Guarantees survivability against worst-case human-body and air-gap discharges in factory and field environments. |
| AEC-Q101 Qualified Option Available | Validated for automotive electronics use cases where qualification to stress-test standards is mandatory. |
| 230 pF Capacitance at 0 V | Preserves signal edge rate and eye diagram integrity in USB 2.0 and RS-485 links without added termination complexity. |
| DO-219AB Low-Profile Package | Reduces board space vs. SMA/SMB; supports automated placement and high-density routing in compact modules. |
Applications
| USB 2.0 Interface Protection | HDMI Signal Line Protection |
|---|---|
Use Scenario: Protecting D+ and D− differential pairs in embedded host/device ports exposed to handling ESD. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between each data line and ground to clamp transients before reaching USB transceiver. Use Value: 230 pF capacitance avoids signal distortion at 480 Mbps; 42.1 V clamping prevents damage to 3.3 V tolerant PHY inputs. | Use Scenario: Safeguarding TMDS clock and data channels on HDMI source/sink PCBs in consumer AV equipment. IC Role / Device Role / Timing Role: Discrete ESD suppressor mounted at connector entry point to divert fast transients away from HDMI controller pins. Use Value: ±30 kV contact discharge rating exceeds IEC 61000-4-2 Level 4; low capacitance maintains 165 MHz pixel clock fidelity. |
| Industrial Sensor Signal Conditioning | Automotive Body Control Module I/O |
Use Scenario: Shielding analog and digital outputs of pressure, temperature, or position sensors in factory automation systems. IC Role / Device Role / Timing Role: Standoff-rated TVS on 0–10 V or 4–20 mA output lines to prevent latch-up or input-stage damage during maintenance handling. Use Value: 26 V VRWM matches common industrial supply rails; −65 °C to +175 °C operation ensures reliability in uncontrolled cabinet environments. | Use Scenario: Protecting LIN bus or discrete switch inputs in body control units subject to assembly-line ESD and load-dump coupling. IC Role / Device Role / Timing Role: AEC-Q101-qualified ESD suppressor on low-speed control lines interfacing with door modules, lighting, or HVAC actuators. Use Value: Validated H3B human-body model >8 kV rating meets automotive OEM ESD requirements; DO-219AB footprint allows drop-in replacement in legacy designs. |
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 (47.3 V at 4.3 A); SMA package (larger footprint, higher RthJA = 200 K/W). | Less suitable for space-constrained USB/HDMI layouts; better for higher-power surges due to 400 W rating. | Select when surge energy exceeds 200 W but board area permits larger SMA package. |
| TPD2E001DRYR | Integrated dual-channel ESD array (2 lines); lower capacitance (13 pF); 12 V VRWM; not unidirectional. | Designed for high-speed digital buses (I²C, GPIO); lacks standalone 26 V standoff capability. | Choose for multi-line, low-capacitance protection where VRWM < 15 V suffices and integrated layout simplifies routing. |
Compared with SMAJ26A-E3/57T and TPD2E001DRYR, SMF26A-HM3_A08 delivers optimal balance of 26 V standoff, 42.1 V clamping, 230 pF capacitance, and DO-219AB compactness-making it preferred for single-line, medium-energy, high-reliability ESD protection in industrial and automotive edge nodes.
Availability
SMF26A-HM3_A08 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI signal line safeguarding, and industrial sensor signal conditioning requiring stable component supply across production lifecycles.
Supply support for SMF26A-HM3_A08 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 diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability and AEC-Q qualification.
The SMF series targets high-reliability ESD protection in space-constrained, thermally demanding applications-including automotive infotainment, industrial I/O, and consumer connectivity-leveraging low-profile DO-219AB packaging and "Low Noise" silicon.
FAQ
What is the maximum clamping voltage of SMF26A-HM3_A08 under standard surge conditions?
The SMF26A-HM3_A08 has a maximum reverse clamping voltage (VC) of 42.1 V when subjected to a 10/1000 μs waveform with a peak pulse current (IPPM) of 4.8 A. This value is specified in the Electrical Characteristics table of the Vishay datasheet (Rev. 2.4, July 2023) and represents the upper voltage limit imposed on protected circuitry during transient events. The SMF26A-HM3_A08 maintains this clamping performance consistently across its qualified operating temperature range.
Is SMF26A-HM3_A08 qualified to AEC-Q101 for automotive use?
The SMF26A-HM3_A08 part number itself is not explicitly marked as AEC-Q101 qualified in the provided Vishay documentation; however, the SMF family offers AEC-Q101-qualified variants (e.g., SMF26A-HE3_A08). The "H" in the ordering code denotes AEC-Q101 qualification, while "HM3_A08" indicates tape-and-reel packaging with RoHS-compliant terminations. For automotive deployment, engineers must specify the HE3 variant to ensure compliance. SMF26A-HM3_A08 remains suitable for industrial applications meeting IEC 61000-4-2 and AEC-Q101 H3B-level ESD robustness.
What is the capacitance of SMF26A-HM3_A08 and how does it affect high-speed signal lines?
The SMF26A-HM3_A08 exhibits a typical capacitance (CD) of 230 pF at 0 V reverse bias and 1 MHz frequency. This value is measured per the Vishay SMF series datasheet and directly impacts signal integrity: it is low enough to avoid significant attenuation or rise-time degradation on USB 2.0 (480 Mbps) and RS-485 links, but higher than specialized low-capacitance arrays (<15 pF). Designers using SMF26A-HM3_A08 on high-speed lines should verify eye diagram margins and consider placement close to connectors to minimize stub inductance. The SMF26A-HM3_A08 balances ESD robustness and signal fidelity for medium-speed interfaces.
What package type does SMF26A-HM3_A08 use and what are its key mechanical dimensions?
SMF26A-HM3_A08 uses the DO-219AB (SMF) package-a low-profile, surface-mount case with standardized SOD-123W compatibility. Its dimensions are 3.9 mm length × 1.9 mm width × 1.08 mm height, with cathode polarity indicated by a bar marking. The package supports both wave and reflow soldering per J-STD-020 MSL level 1, with peak temperature tolerance up to 260 °C. Footprint recommendations include 1.3 mm × 1.3 mm pad extensions and 2.9 mm centerline spacing. This compact form factor makes SMF26A-HM3_A08 ideal for dense PCB layouts where space is constrained.
How does the thermal resistance of SMF26A-HM3_A08 impact PCB layout decisions?
The SMF26A-HM3_A08 has a junction-to-ambient thermal resistance (RthJA) of 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: to maintain safe junction temperatures during repeated surges, designers should allocate adequate copper area around the anode and cathode pads, avoid narrow traces, and consider internal ground planes for heat spreading. Reducing RthJA below 180 K/W improves surge endurance; exceeding it risks parametric drift or failure. The SMF26A-HM3_A08's thermal specification is validated per JEDEC standards and applies directly to production-grade PCB stack-ups.
SMF26A-HM3_A08 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-HM3_A08 FAQ
1.How can I place an order for SMF26A-HM3_A08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF26A-HM3_A08 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_A08 reliable?
The price and inventory of SMF26A-HM3_A08 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_A08 is usually 5 days.
3.What payment methods are accepted for SMF26A-HM3_A08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF26A-HM3_A08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF26A-HM3_A08?
SMF26A-HM3_A08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF26A-HM3_A08 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_A08?
For technical support, including SMF26A-HM3_A08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF26A-HM3_A08 requirements.
6.How does Aetrix verify that SMF26A-HM3_A08 is sourced from the original manufacturer or authorized distributors?
All SMF26A-HM3_A08 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_A08 meets industry standards.
7.What is the process for return or replacement of SMF26A-HM3_A08?
All SMF26A-HM3_A08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF26A-HM3_A08, 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_A08 part is unused and in its original packaging.
Return procedure for SMF26A-HM3_A08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF26A-HM3_A08 Tags
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