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Vishay SMF26A-HM3_A18
- Part No.:
- SMF26A-HM3_A18
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF26A-HM3_A18.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,091
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Product details
Overview
SMF26A-HM3_A18 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, rated for 26 V standoff voltage, 42.1 V maximum clamping voltage at 4.8 A peak pulse current, and 200 W peak pulse power (10/1000 μs). It delivers ±30 kV IEC 61000-4-2 ESD immunity and is AEC-Q101 qualified for automotive electronics.
For engineers reviewing the SMF26A-HM3_A18 datasheet, SMF26A-HM3_A18 pinout, SMF26A-HM3_A18 application, or SMF26A-HM3_A18 equivalent, this device is selected for high-reliability transient suppression in USB 2.0, HDMI, automotive infotainment interfaces, and industrial sensor signal lines where low capacitance (230 pF), fast response, and robust surge handling are critical.
Technical Context
This unidirectional TVS diode operates as a shunt-type transient voltage suppressor, triggered when reverse voltage exceeds its 28.9–32.0 V breakdown range. Its low incremental surge resistance ensures tight clamping during 10/1000 μs transients, limiting downstream IC stress to ≤42.1 V at 4.8 A.
Designed for placement directly at I/O connectors, it leverages "Low Noise" technology for sub-nanosecond response and supports wave/reflow soldering per J-STD-020 MSL level 1. The DO-219AB package enables compact layout with 1.9 mm width and 1.08 mm height.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 26 V - Maximum continuous reverse operating voltage before conduction begins |
| Breakdown Voltage (VBR) | 28.9–32.0 V at 1 mA - Confirmed turn-on threshold for reliable transient detection |
| Clamping Voltage (VC) | 42.1 V at IPPM = 4.8 A - Peak voltage seen by protected circuit during worst-case 10/1000 μs surge |
| Peak Pulse Power | 200 W (10/1000 μs) - Sustains short-duration surges without degradation |
| Capacitance (CD) | 230 pF at 0 V, 1 MHz - Low enough for USB 2.0 (480 Mbps) and HDMI 1.4 signal integrity |
| ESD Rating | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - Meets highest system-level ESD immunity requirements |
| Operating Temp Range | −65 °C to +175 °C - Validated for under-hood automotive and industrial environments |
Pinout & Package
The SMF26A-HM3_A18 uses the DO-219AB (SMF) package: low-profile, surface-mount, cathode-bar marked, compatible with SOD-123W footprint. Dimensions: 3.9 × 1.9 × 1.08 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side (cathode-bar end is cathode) | Connected to protected signal line; conducts transient current toward ground when clamped |
| Cathode | Ground reference terminal | Must be tied to low-impedance system ground to enable effective clamping and energy dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional ESD protection | Enables precise clamping only on negative transients relative to ground-ideal for single-supply data lines |
| AEC-Q101 qualification | Validated for automotive applications including infotainment, body control, and ADAS sensor interfaces |
| Low 230 pF capacitance | Minimizes signal distortion on high-speed interfaces up to 480 Mbps without requiring impedance tuning |
| 200 W peak pulse rating (10/1000 μs) | Handles repeated EFT bursts and lightning-induced surges in industrial fieldbus and automotive CAN/LIN stubs |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking-reduces manufacturing overhead |
Applications
| USB 2.0 Data Lines | HDMI 1.4 Interface |
|---|---|
Use Scenario: Protecting D+ and D− pins of USB 2.0 ports against ESD events during hot-plug and cable handling. IC Role / Device Role / Timing Role: Shunt TVS diode placed immediately at connector, clamping transients before they reach the USB transceiver. Use Value: Maintains signal integrity with 230 pF capacitance while suppressing ±30 kV contact discharges-ensuring USB enumeration reliability. | Use Scenario: Safeguarding TMDS clock and data channels in HDMI 1.4 sources (e.g., automotive head units) from ESD and cable discharge. IC Role / Device Role / Timing Role: Unidirectional transient suppressor on each differential pair, referenced to chassis ground. Use Value: Clamps to ≤42.1 V within nanoseconds, preventing latch-up or damage to HDMI PHY without degrading 165 MHz pixel clock timing. |
| Automotive Infotainment Display | Industrial RS-485 Sensor Node |
Use Scenario: ESD protection for LVDS or FPD-Link II video interface between MCU and TFT display in vehicle dashboards. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional diode (anode-to-ground configuration) used per signal line. Use Value: Withstands −65 °C to +175 °C operation and passes AEC-Q101 stress tests-ensuring lifetime reliability in thermal cycling environments. | Use Scenario: Transient suppression on RS-485 A/B bus lines in factory automation nodes exposed to motor switching noise and lightning-induced surges. IC Role / Device Role / Timing Role: Line-to-ground TVS on both differential conductors, leveraging 200 W pulse rating for 10/1000 μs threats. Use Value: Limits clamping voltage to 42.1 V at 4.8 A, keeping receiver input within common-mode range and avoiding false triggering. |
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 5.1 A); SMA (DO-214AC) package; 3.5 mm height vs. 1.08 mm | Less suitable for space-constrained PCBs; higher thermal resistance limits power handling in dense layouts | Choose SMAJ26A-E3/57T only if legacy SMA footprint reuse is required and board height allows ≥3.5 mm clearance |
| TPD2E001DRYR | 2-channel, 15 pF dual-diode array; lower voltage rating (5.5 V VRWM); not AEC-Q101 qualified | Targeted at low-voltage logic I/O (e.g., GPIO, I²C), not 26 V signal rails or automotive qualification needs | Select TPD2E001DRYR only for non-automotive, low-capacitance (<20 pF), multi-line protection where VRWM ≤5.5 V suffices |
Compared with SMAJ26A-E3/57T and TPD2E001DRYR, SMF26A-HM3_A18 uniquely balances 26 V standoff, ultra-low profile (1.08 mm), AEC-Q101 qualification, and 230 pF capacitance-making it optimal for automotive and industrial high-speed interfaces where board space, reliability, and signal fidelity are jointly constrained.
Availability
SMF26A-HM3_A18 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial RS-485 networks, and consumer USB/HDMI interface designs requiring stable component supply across extended production lifecycles.
Supply support for SMF26A-HM3_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 Intertechnology is a global semiconductor manufacturer specializing in discrete components, sensors, and passive elements, with leadership in TVS diodes, MOSFETs, and precision resistors.
The SMF series is part of Vishay's eSMP® family, engineered specifically for high-power-density, low-profile ESD and surge protection in automotive, industrial, and computing applications demanding AEC-Q101 compliance and minimal board area.
FAQ
What is the exact package type and dimensions of SMF26A-HM3_A18?
The SMF26A-HM3_A18 uses the DO-219AB (SMF) package: 3.9 mm length × 1.9 mm width × 1.08 mm height, with cathode bar marking. It is footprint-compatible with SOD-123W and meets JEDEC MO-294 standards. This low-profile design enables placement adjacent to high-speed connectors without height interference.
Is SMF26A-HM3_A18 AEC-Q101 qualified, and what test conditions does that cover?
Yes, SMF26A-HM3_A18 is AEC-Q101 qualified. This certification covers stress testing including high-temperature operating life (HTOL), temperature cycling, ESD (HBM >8 kV), and mechanical shock-all performed per AEC-Q101 Rev D. Qualification confirms suitability for automotive under-hood and cabin electronics.
What is the maximum clamping voltage of SMF26A-HM3_A18, and at what current is it specified?
The maximum clamping voltage of SMF26A-HM3_A18 is 42.1 V, measured at a peak pulse current (IPPM) of 4.8 A using a 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during standardized surge events.
Can SMF26A-HM3_A18 be used for bidirectional signal lines like RS-485?
SMF26A-HM3_A18 is unidirectional but can protect RS-485 lines when used in pairs-anode-to-ground on one line and cathode-to-ground on the other-or configured as line-to-line with external biasing. Its 26 V VRWM aligns with typical RS-485 common-mode ranges, and 42.1 V clamping preserves receiver tolerance margins.
What is the capacitance of SMF26A-HM3_A18, and how does it affect high-speed signal integrity?
SMF26A-HM3_A18 has a typical capacitance of 230 pF at 0 V and 1 MHz. While higher than some ultra-low-capacitance arrays, this value is acceptable for USB 2.0 (480 Mbps) and HDMI 1.4 (165 MHz) when placed with short traces and proper grounding-verified in Vishay's application notes for these interfaces.
SMF26A-HM3_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-HM3_A18 FAQ
1.How can I place an order for SMF26A-HM3_A18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF26A-HM3_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-HM3_A18 reliable?
The price and inventory of SMF26A-HM3_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-HM3_A18 is usually 5 days.
3.What payment methods are accepted for SMF26A-HM3_A18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF26A-HM3_A18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF26A-HM3_A18?
SMF26A-HM3_A18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF26A-HM3_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-HM3_A18?
For technical support, including SMF26A-HM3_A18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF26A-HM3_A18 requirements.
6.How does Aetrix verify that SMF26A-HM3_A18 is sourced from the original manufacturer or authorized distributors?
All SMF26A-HM3_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-HM3_A18 meets industry standards.
7.What is the process for return or replacement of SMF26A-HM3_A18?
All SMF26A-HM3_A18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF26A-HM3_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-HM3_A18 part is unused and in its original packaging.
Return procedure for SMF26A-HM3_A18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF26A-HM3_A18 Tags
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