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Vishay General Semiconductor - Diodes Division SMF28A-HE3-08
- Part No.:
- SMF28A-HE3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF28A-HE3-08.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,944
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Product details
Overview
SMF28A-HE3-08 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for low-capacitance transient suppression in high-speed data lines. It features a 28 V stand-off voltage (VRWM), 31.1–34.4 V reverse breakdown range (VBR), 4.4 A peak pulse current (IPPM), 45.4 V maximum clamping voltage (VC), and 227 pF typical capacitance at 0 V - optimized for USB 2.0, HDMI, and industrial I/O port protection.
For engineers reviewing the SMF28A-HE3-08 datasheet, SMF28A-HE3-08 pinout, SMF28A-HE3-08 application, or SMF28A-HE3-08 equivalent, key selection criteria include clamping performance under IEC 61000-4-2 ±30 kV contact/air discharge, AEC-Q101 qualification status, SOD-123W-compatible footprint, and low incremental surge resistance for fast response in signal integrity-critical interfaces.
Technical Context
This device operates as a single-channel unidirectional TVS diode with cathode-anode polarity, leveraging silicon avalanche technology to clamp transients above its breakdown threshold while maintaining low leakage (<0.1 µA at VRWM). Its DO-219AB package enables compact PCB layout with thermal resistance RthJA = 180 K/W on standard epoxy-glass substrates.
The SMF28A-HE3-08 delivers 200 W peak pulse power (10/1000 µs waveform) and 1000 W (8/20 µs per IEC 61000-4-5), with junction temperature rated from –65 °C to +175 °C and ESD immunity meeting IEC 61000-4-2 Class 4 requirements. It is qualified to AEC-Q101 for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 28 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 24 V nominal systems. |
| Reverse Breakdown (VBR) | 31.1–34.4 V at 1 mA - precise avalanche onset ensures predictable turn-on during fast transients without premature conduction. |
| Clamping Voltage (VC) | 45.4 V at 4.4 A IPPM - limits downstream IC stress during 10/1000 µs surges, enabling robust protection of 3.3 V/5 V logic interfaces. |
| Capacitance (CD) | 227 pF at 0 V, 1 MHz - low enough for USB 2.0 (480 Mbps) and RS-485, but not suitable for USB 3.x or PCIe Gen3+. |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - exceeds industrial and automotive ESD immunity requirements for exposed connectors. |
| AEC-Q101 Qualified | Yes - validated for automotive applications including infotainment, body control modules, and ADAS sensor interfaces. |
| Package | DO-219AB (SOD-123W-compatible) - 3.9 × 1.9 × 1.08 mm footprint with MSL Level 1 rating and reflow-solderable terminations. |
Pinout & Package
SMF28A-HE3-08 uses the DO-219AB (SOD-123W-equivalent) surface-mount package: anodic terminal at one end, cathodic terminal at the other, marked by a bar on the cathode side. The package supports wave and reflow soldering with peak temperature ≤260 °C and meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Input/Signal Line Connection | Connected to protected line (e.g., USB D+, HDMI TMDS+); conducts during positive transients when referenced to ground. |
| Cathode (bar-marked end) | Ground Reference Terminal | Connected to system ground plane; provides low-impedance path for surge current during ESD events. |
Key Features
| Feature | Design Value |
|---|---|
| Low-Noise Fast Response | Sub-nanosecond turn-on enables clamping before sensitive ICs experience overvoltage - critical for high-speed serial links. |
| 200 W Peak Pulse Power (10/1000 µs) | Sustains repeated low-duty-cycle surges without degradation, supporting long-term reliability in industrial fieldbus nodes. |
| AEC-Q101 Qualification | Validated for automotive environments including temperature cycling, mechanical shock, and humidity testing per JESD22 standards. |
| Low Incremental Surge Resistance | Minimizes voltage overshoot during fast-rising transients, reducing risk of latch-up or gate oxide damage in downstream ICs. |
| SOD-123W Footprint Compatibility | Enables drop-in replacement in existing layouts designed for legacy SOD-123 packages, simplifying design migration. |
Applications
| Industrial I/O Protection | Automotive Infotainment Ports |
|---|---|
|
Use Scenario: Protecting RS-485/RS-232 ports on PLCs and motor drives from ESD and lightning-induced surges in factory automation. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed between signal line and chassis ground. Use Value: Clamps 4.4 A surges to ≤45.4 V while adding only 227 pF loading - preserving signal integrity up to 10 Mbps. |
Use Scenario: Shielding USB 2.0 and HDMI Type-A ports in head units and rear-seat entertainment systems from user-handling ESD. IC Role / Device Role / Timing Role: Single-line ESD clamp on differential data pairs, mounted adjacent to connector. Use Value: Withstands ±30 kV contact discharge per IEC 61000-4-2 without degradation, ensuring AEC-Q101-compliant field reliability. |
| Medical Sensor Interfaces | Smart Building Control Panels |
|
Use Scenario: Safeguarding analog sensor inputs (e.g., thermocouple, pressure transducer) in portable diagnostic devices from electrostatic discharge. IC Role / Device Role / Timing Role: Low-leakage (≤0.1 µA) unidirectional TVS placed before ADC input stage. Use Value: Maintains <0.1 µA reverse current at 28 V, preventing measurement offset drift while delivering 45.4 V clamping under surge. |
Use Scenario: Protecting touch-screen controller I/O and Ethernet PHY lines in wall-mounted HVAC and lighting control panels. IC Role / Device Role / Timing Role: Board-level ESD suppressor on front-panel buttons, display flex cables, and RJ45 magnetics secondary side. Use Value: 175 °C max junction temperature and –65 °C min storage rating support operation in unconditioned indoor/outdoor enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A-E3/5A (Vishay) | Higher clamping voltage (49.1 V), larger SMA (DO-214AC) package (4.5 × 2.7 × 2.2 mm), 5.0 A IPPM. | Better suited for higher-energy surges (e.g., 400 W 8/20 µs), but adds >2× board area and 3× capacitance (700 pF). | Select when surge energy exceeds SMF28A-HE3-08's 200 W rating or when legacy SMA footprints are fixed. |
| TPD2EUSB30DRYR (TI) | 2-channel bidirectional array, 0.8 pF per line, 5.5 V VRWM, integrated 5.5 V DC blocking capacitor. | Designed specifically for USB 3.1 Gen1 (5 Gbps); incompatible with 28 V systems due to low stand-off voltage. | Choose only for ultra-high-speed differential interfaces requiring sub-1 pF loading - not a functional substitute for SMF28A-HE3-08's 28 V rail protection. |
Compared with SMAJ28A-E3/5A and TPD2EUSB30DRYR, SMF28A-HE3-08 uniquely balances 28 V system compatibility, compact DO-219AB size, and 227 pF capacitance - making it optimal for cost-sensitive, space-constrained 24 V industrial and automotive data line protection where USB 2.0/HDMI speed grades apply.
Availability
SMF28A-HE3-08 is available at Aetrix Electronics and suitable for industrial I/O protection, automotive infotainment ports, and medical sensor interfaces requiring stable component supply across extended product lifecycles.
Supply support for SMF28A-HE3-08 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 power management, sensing, and protection components with emphasis on reliability, precision, and automotive-grade qualification.
The SMF series targets high-reliability ESD protection for automotive, industrial, and medical applications - engineered for low clamping, fast response, and AEC-Q101 compliance in compact surface-mount packages.
FAQ
What is the maximum clamping voltage of SMF28A-HE3-08 under a 4.4 A transient?
The SMF28A-HE3-08 has a maximum clamping voltage (VC) of 45.4 V at 4.4 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is guaranteed per Vishay's Electrical Characteristics table and defines the upper voltage limit imposed on protected circuitry during standardized surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMF28A-HE3-08 qualified to AEC-Q101?
Yes, SMF28A-HE3-08 is AEC-Q101 qualified, as confirmed in Vishay's "Features" section and ordering information notes. This qualification covers stress tests including temperature cycling, high-temperature operating life, and ESD robustness - validating its suitability for automotive applications such as infotainment, body electronics, and ADAS sensor interfaces.
What package type does SMF28A-HE3-08 use, and is it compatible with SOD-123W layouts?
SMF28A-HE3-08 uses the DO-219AB package (also known as eSMP®), which Vishay explicitly states is compatible with SOD-123W, SOD-123F, and SOD-123FL case outlines. Its dimensions (3.9 × 1.9 × 1.08 mm) match SOD-123W footprints, enabling direct placement in existing designs without PCB revision.
Does SMF28A-HE3-08 meet IEC 61000-4-2 ESD immunity requirements?
Yes, SMF28A-HE3-08 meets IEC 61000-4-2 with ±30 kV contact discharge and ±30 kV air discharge ratings - exceeding Class 4 requirements. This performance is verified per Vishay's "Features" and "Absolute Maximum Ratings" sections and applies to both single-pulse and 10-pulse test conditions.
What is the typical capacitance of SMF28A-HE3-08 at 0 V and 1 MHz?
The typical capacitance of SMF28A-HE3-08 is 227 pF at 0 V reverse bias and 1 MHz frequency, as specified in Vishay's Electrical Characteristics table. This value is measured under standardized AC conditions and directly impacts signal integrity - making SMF28A-HE3-08 appropriate for USB 2.0 and HDMI 1.4 but not for higher-speed protocols like USB 3.2 or DisplayPort 1.4.
SMF28A-HE3-08 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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 4.4A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 227pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF28A-HE3-08 FAQ
1.How can I place an order for SMF28A-HE3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF28A-HE3-08 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 SMF28A-HE3-08 reliable?
The price and inventory of SMF28A-HE3-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF28A-HE3-08 is usually 5 days.
3.What payment methods are accepted for SMF28A-HE3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF28A-HE3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF28A-HE3-08?
SMF28A-HE3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF28A-HE3-08 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 SMF28A-HE3-08?
For technical support, including SMF28A-HE3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF28A-HE3-08 requirements.
6.How does Aetrix verify that SMF28A-HE3-08 is sourced from the original manufacturer or authorized distributors?
All SMF28A-HE3-08 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 SMF28A-HE3-08 meets industry standards.
7.What is the process for return or replacement of SMF28A-HE3-08?
All SMF28A-HE3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF28A-HE3-08, 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 SMF28A-HE3-08 part is unused and in its original packaging.
Return procedure for SMF28A-HE3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF28A-HE3-08 Tags
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