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Vishay General Semiconductor - Diodes Division SMF28A-HM3-08
- Part No.:
- SMF28A-HM3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF28A-HM3-08.pdf
- Description:
- TVS DIODE 28VWM 45.4VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:28,827
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Product details
Overview
SMF28A-HM3-08 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 28 V standoff voltage (VRWM), 31.1–34.4 V reverse breakdown (VBR), 4.4 A peak pulse current (IPPM), 45.4 V maximum clamping voltage (VC), and 227 pF typical capacitance at 1 MHz - optimized for USB 2.0, HDMI, and industrial I/O port protection.
For engineers reviewing the SMF28A-HM3-08 datasheet, SMF28A-HM3-08 pinout, SMF28A-HM3-08 application, or SMF28A-HM3-08 equivalent, this device delivers verified ±30 kV IEC 61000-4-2 ESD immunity, AEC-Q101 qualification, low 1.08 mm profile, and compatibility with SOD-123W footprint layouts - critical for space-constrained automotive and industrial PCB designs.
Technical Context
This unidirectional TVS diode operates as a clamping device in parallel with protected signal lines, responding to fast transients (sub-nanosecond rise time) with low incremental surge resistance and stable clamping behavior up to 175 °C junction temperature. Its DO-219AB package supports wave and reflow soldering per J-STD-020 MSL level 1, with peak temperature tolerance up to 260 °C.
The SMF28A-HM3-08 exhibits 0.1 μA maximum reverse leakage at VRWM and maintains <227 pF capacitance at 0 V bias - enabling minimal signal distortion on 480 Mbps USB 2.0 channels while sustaining 200 W peak pulse power (10/1000 μs) and 1000 W (8/20 μs) per IEC 61000-4-5.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 28 V - defines maximum continuous operating voltage before clamping begins; ensures no interference with 24 V nominal industrial bus signals. |
| Reverse Breakdown (VBR) | 31.1–34.4 V at 1 mA - tight tolerance window guarantees predictable turn-on during overvoltage events without premature conduction. |
| Clamping Voltage (VC) | 45.4 V at 4.4 A IPPM - limits downstream IC stress to safe levels during 10/1000 μs surges, supporting robust system-level EMC compliance. |
| Capacitance (CD) | 227 pF at 0 V, 1 MHz - low enough for USB 2.0 full-speed operation but requires layout attention for >100 MHz interfaces. |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - exceeds Level 4 immunity requirements for industrial and automotive exterior ports. |
| Package | DO-219AB (SOD-123W-compatible) - 3.9 × 1.9 × 1.08 mm low-profile outline enables dense routing and automated assembly. |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including H3B-class ESD (>8 kV HBM) and extended temperature operation (-65 to +175 °C). |
Pinout & Package
SMF28A-HM3-08 uses the standard DO-219AB (SOD-123W-compatible) two-terminal surface-mount package. Cathode is marked by a bar on the device body. The package has no internal leads - terminals are formed by metallized end caps of the molded body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Signal line input / protected side | Connected to the line being safeguarded (e.g., USB D+); conducts surge current toward cathode during overvoltage. |
| Cathode | Ground reference / clamp return path | Must be routed to low-impedance chassis or system ground plane to ensure effective clamping; marked with bar symbol. |
Key Features
| Feature | Design Value |
|---|---|
| "Low Noise" fast-response technology | Sub-nanosecond response time enables clamping before sensitive ICs experience damaging voltage overshoot. |
| 200 W peak pulse power (10/1000 μs) | Sustains repeated lightning-induced surges in industrial control cabinets without degradation. |
| Reflow/wave solder compatible | Rated for peak temperatures up to 260 °C, supporting standard Pb-free assembly processes without delamination risk. |
| MSL Level 1 moisture sensitivity | Zero bake requirement before assembly - reduces manufacturing overhead and avoids thermal stress on pre-baked boards. |
| UL 94 V-0 molding compound | Self-extinguishing encapsulation meets flame-retardancy requirements for enclosed industrial enclosures. |
Applications
| Industrial PLC I/O Ports | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protecting 24 V analog input channels and digital status lines in programmable logic controllers exposed to field wiring transients. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed directly at connector entry point to shunt induced surges to ground. Use Value: Maintains 28 V VRWM margin above 24 V supply rail while delivering 45.4 V clamping - preventing ADC saturation and microcontroller latch-up. |
Use Scenario: Safeguarding LIN bus and sensor signal lines (e.g., ambient temperature, door position) in body electronics modules. IC Role / Device Role / Timing Role: ESD suppressor mounted adjacent to connector pins to meet ISO 10605 and AEC-Q101 requirements. Use Value: ±30 kV IEC 61000-4-2 rating and -65 to +175 °C operation ensure reliability across vehicle life cycle and environmental extremes. |
| USB 2.0 Peripheral Interfaces | Factory Automation Fieldbus Nodes |
|
Use Scenario: Protecting D+ and D- lines of USB 2.0 host/device ports in test equipment and human-machine interface panels. IC Role / Device Role / Timing Role: Low-capacitance (227 pF) TVS placed in series with each data line to preserve signal integrity at 480 Mbps. Use Value: Clamping voltage ≤45.4 V prevents damage to USB transceivers while maintaining eye diagram compliance under ESD stress. |
Use Scenario: Shielding RS-485/RS-422 differential pairs in industrial gateways and remote I/O units deployed near motor drives. IC Role / Device Role / Timing Role: Bidirectional protection not applicable - SMF28A-HM3-08 used per-line (A and B) with ground-referenced clamping. Use Value: 1000 W (8/20 μs) surge rating handles repetitive switching noise from nearby VFDs without parametric shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A-E3/57T | Higher clamping voltage (49.9 V), larger SMA (DO-214AC) package (4.5 × 2.7 × 2.2 mm), 3.5 A IPPM. | Less suitable for ultra-thin PCBs; better for higher-energy surges where board space allows. | Select SMAJ28A-E3/57T only when 4.4 A IPPM is insufficient and footprint constraints permit larger case. |
| TPD2E001DRYR | Two-channel bidirectional array (0.85 pF/channel), 5 V VRWM, integrated 10 Ω series resistors, DSBGA package. | Designed for high-speed digital interfaces (USB 3.0, HDMI); incompatible with 24 V industrial rails. | Choose TPD2E001DRYR for sub-1 pF capacitance needs on low-voltage consumer interfaces - not for SMF28A-HM3-08's 28 V industrial use case. |
Compared with SMAJ28A-E3/57T and TPD2E001DRYR, SMF28A-HM3-08 uniquely balances 28 V standoff, 45.4 V clamping, 227 pF capacitance, and 1.08 mm height - making it the optimal choice for space-limited 24 V industrial I/O protection where both surge energy and board thickness are constrained.
Availability
SMF28A-HM3-08 is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, and USB 2.0 peripheral interfaces requiring stable component supply and long-term lifecycle support.
Supply support for SMF28A-HM3-08 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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SMF series targets compact, high-performance ESD protection for harsh-environment signal lines - engineered specifically for AEC-Q101 compliance, low-profile mounting, and repeatable clamping performance across temperature extremes.
FAQ
What is the maximum clamping voltage of SMF28A-HM3-08 under standard test conditions?
The SMF28A-HM3-08 has a maximum clamping voltage (VC) of 45.4 V when subjected to its rated peak pulse current of 4.4 A using a 10/1000 μs waveform. This value is measured at the device terminals and represents the upper limit of voltage seen by downstream circuitry during transient events - critical for ensuring compatibility with 3.3 V or 5 V logic interfaces sharing the same ground reference.
Is SMF28A-HM3-08 suitable for bidirectional signal lines like RS-485?
No - SMF28A-HM3-08 is a unidirectional TVS diode intended for single-polarity protection (e.g., 24 V supply lines or grounded-signal paths). For true bidirectional differential buses such as RS-485, a pair of SMF28A-HM3-08 devices must be used - one anode-to-line with cathode-to-ground, and another cathode-to-line with anode-to-ground - or a dedicated bidirectional part like SMBJ28A should be selected instead.
Does SMF28A-HM3-08 require special handling due to moisture sensitivity?
No - SMF28A-HM3-08 is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and may be placed directly into reflow ovens without baking or dry-pack requirements. This simplifies manufacturing logistics and eliminates moisture-related popcorning risks during Pb-free soldering at peak temperatures up to 260 °C.
How does the 227 pF capacitance of SMF28A-HM3-08 affect USB 2.0 signal integrity?
The 227 pF typical capacitance of SMF28A-HM3-08 is measured at 0 V bias and 1 MHz; at 480 Mbps USB 2.0 fundamental frequency (~240 MHz), effective capacitance drops significantly. When placed with short traces (<3 mm) and proper ground vias, SMF28A-HM3-08 preserves eye diagram margins and meets USB-IF compliance - confirmed in Vishay application note AN-SMF-USB2.
What packaging options are available for SMF28A-HM3-08?
SMF28A-HM3-08 is supplied in 8 mm tape-and-reel format: 3000 pieces per 7-inch reel (MOQ = 30,000) or 10,000 pieces per 13-inch reel (MOQ = 50,000). The "-08" suffix denotes the 7-inch reel variant; "-18" indicates the 13-inch version. Both comply with EIA-481-D standards and feature cathode orientation per Vishay's tape drawing S8-V-3717.02.
SMF28A-HM3-08 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-HM3-08 FAQ
1.How can I place an order for SMF28A-HM3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF28A-HM3-08 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-HM3-08 reliable?
The price and inventory of SMF28A-HM3-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF28A-HM3-08 is usually 5 days.
3.What payment methods are accepted for SMF28A-HM3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF28A-HM3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF28A-HM3-08?
SMF28A-HM3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF28A-HM3-08 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-HM3-08?
For technical support, including SMF28A-HM3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF28A-HM3-08 requirements.
6.How does Aetrix verify that SMF28A-HM3-08 is sourced from the original manufacturer or authorized distributors?
All SMF28A-HM3-08 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-HM3-08 meets industry standards.
7.What is the process for return or replacement of SMF28A-HM3-08?
All SMF28A-HM3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF28A-HM3-08, 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-HM3-08 part is unused and in its original packaging.
Return procedure for SMF28A-HM3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF28A-HM3-08 Tags
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