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Vishay SMF26A-HE3_A08
- Part No.:
- SMF26A-HE3_A08
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF26A-HE3_A08.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,945
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Product details
Overview
SMF26A-HE3_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 AEC-Q101 qualified and used in automotive infotainment USB interfaces.
For engineers reviewing the SMF26A-HE3_A08 datasheet, SMF26A-HE3_A08 pinout, SMF26A-HE3_A08 application, or SMF26A-HE3_A08 equivalent, key selection criteria include clamping voltage vs. protected IC's absolute maximum rating, capacitance (230 pF at 0 V) for signal integrity in USB 2.0 paths, thermal resistance (180 K/W), and SOD-123W-compatible footprint compatibility with automated assembly.
Technical Context
This device operates as a unidirectional TVS diode, leveraging silicon avalanche breakdown to clamp transients above its reverse standoff voltage (26 V). Its low incremental surge resistance ensures rapid voltage limiting during ESD events, while its "Low Noise" technology enables sub-nanosecond response time critical for protecting high-speed interfaces.
The SMF26A-HE3_A08 is rated for 175 °C junction temperature and -65 °C to +175 °C operating range, supporting under-hood automotive environments. Its DO-219AB package meets MSL level 1 per J-STD-020 and supports wave and reflow soldering up to 260 °C peak temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 26 V - Maximum continuous reverse working voltage before clamping begins; sets minimum system operating margin. |
| Clamping Voltage (VC) | 42.1 V max 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; derates linearly above 25 °C ambient. |
| Capacitance | 230 pF at 0 V, 1 MHz - Impacts signal rise/fall times; suitable for USB 2.0 (480 Mbps) but not USB 3.x. |
| ESD Immunity | ±30 kV contact & air discharge (IEC 61000-4-2) - Meets automotive and industrial ESD robustness requirements. |
| Thermal Resistance | 180 K/W (RthJA on 3 mm × 3 mm Cu pad) - Determines steady-state power dissipation limit in PCB layout. |
| Operating Temp Range | -65 °C to +175 °C - Enables use in engine control units, ADAS sensors, and powertrain modules. |
Pinout & Package
SMF26A-HE3_A08 uses the DO-219AB (SMF) package: low-profile (1.08 mm height), 3.9 mm × 1.9 mm footprint, cathode-bar marked top-side orientation. Compatible with SOD-123W, SOD-123F, and SOD-123FL land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Protected circuit ground reference | Connected to system GND; forms return path for clamped surge current. |
| Cathode | Protected line input | Connected to signal line (e.g., USB D+); blocks DC but conducts during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including temperature cycling, mechanical shock, and humidity testing. |
| Low clamping ratio (VC/VRWM ≈ 1.62) | Minimizes stress on downstream ICs-e.g., keeps USB PHY within 42.1 V during 8/20 μs surges. |
| 230 pF capacitance at 0 V | Enables <1 ns rise time preservation in 480 Mbps USB 2.0 links without excessive signal distortion. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow without baking; reduces manufacturing overhead. |
| 175 °C junction rating | Supports placement near heat sources (e.g., power converters) without thermal derating penalties. |
Applications
| Automotive Infotainment USB | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting USB 2.0 data lines (D+/D−) in head unit docking stations exposed to human-body ESD during cable insertion. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed between connector and USB transceiver IC. Use Value: Clamps 30 kV contact discharges to ≤42.1 V, preventing latch-up or gate oxide damage in the PHY IC while maintaining signal integrity via 230 pF capacitance. | Use Scenario: Safeguarding CAN_H/CAN_L lines in factory automation PLC modules subjected to inductive switching transients. IC Role / Device Role / Timing Role: Standoff-rated TVS pair (one per line) referenced to chassis ground to shunt fast-rising noise spikes. Use Value: Withstands 200 W surges and operates across -65 °C to +175 °C, ensuring reliability in uncontrolled ambient industrial enclosures. |
| Medical Patient Monitor Ports | Consumer Smart Home Hub Ethernet |
Use Scenario: ESD protection on RS-232 or USB ports of portable patient monitors handling frequent clinician interaction. IC Role / Device Role / Timing Role: Primary front-end ESD clamp on external interface connectors per IEC 60601-1-2 4th ed. Use Value: Delivers ±30 kV air/contact discharge immunity and AEC-Q101 reliability evidence-leveraged for medical regulatory justification. | Use Scenario: Transient suppression on 10/100BASE-TX Ethernet PHY differential pairs in smart speaker hubs located near AC mains. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS on each data line (TX+/TX−, RX+/RX−) to preserve signal eye diagram. Use Value: 230 pF capacitance avoids jitter accumulation at 100 Mbps; 42.1 V clamping prevents PHY overvoltage beyond 3.3 V rail tolerance. |
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), larger SMA (DO-214AC) package (4.5 mm × 2.7 mm), 350 pF capacitance. | Less suitable for high-speed USB due to higher capacitance and slower response; better for lower-frequency power rails. | Select SMAJ26A-E3/57T only when board space allows larger footprint and signal bandwidth <100 Mbps. |
| TPD2E001DRYR | Bi-directional dual-channel ESD array (0.8 pF per line), 5 V VRWM, integrated 8-kV HBM protection, QFN-6 package. | Designed for ultra-high-speed interfaces (USB 3.0, HDMI); incompatible with 26 V standoff requirement. | Choose TPD2E001DRYR for sub-1-pF, multi-line protection where VRWM ≤5 V is acceptable; not a functional substitute for SMF26A-HE3_A08. |
Compared with SMAJ26A-E3/57T and TPD2E001DRYR, SMF26A-HE3_A08 uniquely balances 26 V standoff, 42.1 V clamping, 230 pF, and DO-219AB compactness-making it optimal for cost-sensitive, space-constrained automotive USB 2.0 designs requiring AEC-Q101 validation.
Availability
SMF26A-HE3_A08 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial CAN nodes, and medical patient monitor interfaces requiring stable component supply across extended product lifecycles.
Supply support for SMF26A-HE3_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 Intertechnology is a global manufacturer of discrete semiconductors and passive components, specializing in high-reliability solutions for automotive, industrial, and computing markets.
The SMF series targets board-level ESD and surge protection in space-constrained, thermally demanding applications-designed specifically for AEC-Q101 compliance and seamless integration into high-volume SMT lines.
FAQ
What is the maximum clamping voltage of SMF26A-HE3_A08 under a 10/1000 μs surge?
The SMF26A-HE3_A08 has a maximum clamping voltage (VC) of 42.1 V when subjected to its rated peak pulse current of 4.8 A using a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 test conditions and defines the upper voltage limit imposed on protected circuitry during transient events. The SMF26A-HE3_A08 maintains this clamping performance across its full operating temperature range.
Is SMF26A-HE3_A08 suitable for USB 2.0 data line protection?
Yes, SMF26A-HE3_A08 is suitable for USB 2.0 data line protection due to its 230 pF capacitance at 0 V and 42.1 V clamping voltage, which preserves signal integrity up to 480 Mbps while safeguarding the PHY against ±30 kV ESD. Its DO-219AB package allows dense routing, and AEC-Q101 qualification supports automotive USB implementations. The SMF26A-HE3_A08 must be placed within 2 mm of the connector for optimal effectiveness.
Does SMF26A-HE3_A08 meet AEC-Q101 reliability standards?
Yes, SMF26A-HE3_A08 is explicitly AEC-Q101 qualified, having passed stress tests including temperature cycling, high-temperature operating life, and ESD (HBM >8 kV). This qualification is documented in Vishay's official specification document 85881 (Rev. 2.4), confirming suitability for automotive applications such as infotainment and body control modules. The SMF26A-HE3_A08 carries the "HE3" suffix denoting AEC-Q101 compliance.
What is the thermal resistance (RthJA) of SMF26A-HE3_A08 on a standard PCB layout?
The SMF26A-HE3_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 assumes no internal plane layers and defines the steady-state temperature rise per watt of dissipated power. For higher power handling, designers should increase copper area or add thermal vias-critical for repeated surge events. The SMF26A-HE3_A08's 175 °C max junction temperature enables operation in hot environments.
How does the capacitance of SMF26A-HE3_A08 affect high-speed signal performance?
The SMF26A-HE3_A08 exhibits 230 pF typical capacitance at 0 V bias and 1 MHz, which introduces minimal loading on USB 2.0 differential pairs-preserving rise/fall times and eye opening at 480 Mbps. At higher reverse biases (e.g., 10 V), capacitance drops significantly, further reducing signal distortion. However, this capacitance makes SMF26A-HE3_A08 unsuitable for USB 3.x or HDMI, where sub-1 pF is required. The SMF26A-HE3_A08's capacitance is verified per Figure 5 in Vishay document 85881.
SMF26A-HE3_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-HE3_A08 FAQ
1.How can I place an order for SMF26A-HE3_A08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF26A-HE3_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-HE3_A08 reliable?
The price and inventory of SMF26A-HE3_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-HE3_A08 is usually 5 days.
3.What payment methods are accepted for SMF26A-HE3_A08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF26A-HE3_A08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF26A-HE3_A08?
SMF26A-HE3_A08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF26A-HE3_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-HE3_A08?
For technical support, including SMF26A-HE3_A08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF26A-HE3_A08 requirements.
6.How does Aetrix verify that SMF26A-HE3_A08 is sourced from the original manufacturer or authorized distributors?
All SMF26A-HE3_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-HE3_A08 meets industry standards.
7.What is the process for return or replacement of SMF26A-HE3_A08?
All SMF26A-HE3_A08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF26A-HE3_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-HE3_A08 part is unused and in its original packaging.
Return procedure for SMF26A-HE3_A08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF26A-HE3_A08 Tags
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