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Vishay General Semiconductor - Diodes Division SMF45A-HM3-08
- Part No.:
- SMF45A-HM3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF45A-HM3-08.pdf
- Description:
- TVS DIODE 45VWM 72.7VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:9,207
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Product details
Overview
SMF45A-HM3-08 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in DO-219AB (SOD-123W) package, rated for 45 V standoff voltage, 72.7 V maximum clamping voltage at 2.8 A peak pulse current, 200 W peak pulse power (10/1000 μs), and ±30 kV IEC 61000-4-2 ESD immunity. It protects USB 2.0 data lines, HDMI interfaces, and automotive infotainment I/O ports.
For engineers reviewing the SMF45A-HM3-08 datasheet, SMF45A-HM3-08 pinout, SMF45A-HM3-08 application, or SMF45A-HM3-08 equivalent, key selection criteria include clamping voltage under 2.8 A surge, sub-162 pF capacitance at 0 V, AEC-Q101 qualification status, and compatibility with reflow soldering per J-STD-020 MSL level 1.
Technical Context
This device operates as a transient voltage suppression (TVS) diode with avalanche breakdown behavior, designed for unidirectional clamping in DC-biased signal paths. Its low incremental surge resistance ensures rapid voltage clamping during ESD events, while its "Low Noise" technology delivers sub-nanosecond response time.
The SMF45A-HM3-08 is optimized for high-reliability automotive and industrial applications requiring robust electrostatic discharge protection without signal integrity degradation. It supports bidirectional layout flexibility via cathode-bar marking and maintains stable performance across -65 °C to +175 °C operating temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 45 V - Maximum continuous reverse working voltage before clamping begins |
| Clamping Voltage (VC) | 72.7 V at IPPM = 2.8 A - Peak voltage seen by protected circuit during 10/1000 μs surge |
| Peak Pulse Power (PPP) | 200 W (10/1000 μs) - Sustains short-duration transients without failure |
| Capacitance (CD) | 162 pF at VR = 0 V, f = 1 MHz - Low enough for USB 2.0 (480 Mbps) signal integrity |
| ESD Rating | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - Meets highest system-level ESD immunity requirement |
| Operating Temp Range | -65 °C to +175 °C - Validated for under-hood automotive and industrial environments |
| AEC-Q101 Qualified | Yes - Certified for automotive electronics per stress test standard |
Pinout & Package
SMF45A-HM3-08 uses the DO-219AB (SOD-123W) package: 3.9 mm × 1.9 mm × 1.08 mm, low-profile, wave/reflow solderable, MSL level 1, UL 94 V-0 molding compound. Cathode indicated by bar marking on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side of protected path | Connected to signal line or power rail requiring ESD protection |
| Cathode | Ground reference / clamp node | Connected to system ground or low-impedance return path to sink surge current |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables reliable protection against multiple ESD strikes without parameter shift |
| ±30 kV IEC 61000-4-2 ESD immunity | Exceeds Level 4 system-level ESD requirements for automotive ECUs and industrial HMI |
| 162 pF capacitance at 0 V | Minimizes signal distortion on high-speed digital interfaces up to 480 Mbps |
| AEC-Q101 qualified | Validated for automotive use including temperature cycling, mechanical shock, and humidity testing |
| DO-219AB package compatibility | Drop-in replacement for SOD-123F/FL footprints with improved thermal dissipation |
Applications
| USB 2.0 Data Lines | HDMI Interface Protection |
|---|---|
Use Scenario: Protecting D+ and D- differential pairs in portable USB peripherals and host controllers. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between signal line and ground to clamp ESD-induced overvoltage. Use Value: 162 pF capacitance avoids signal rise-time degradation; 72.7 V clamping prevents damage to 3.3 V PHY transceivers. | Use Scenario: Safeguarding TMDS clock and data channels in automotive infotainment head units. IC Role / Device Role / Timing Role: Standoff-rated clamping device on each TMDS lane, referenced to chassis ground. Use Value: AEC-Q101 qualification ensures reliability in vibration-prone vehicle cabins; -65 °C to +175 °C range covers cold-cranking to under-dash thermal extremes. |
| Automotive LIN Bus Nodes | Industrial Sensor Signal Conditioning |
Use Scenario: Protecting LIN transceiver pins (TXD/RXD) in body control modules and door modules. IC Role / Device Role / Timing Role: Low-leakage unidirectional suppressor on bidirectional LIN bus line. Use Value: 0.1 μA max reverse leakage at 45 V preserves bus bias stability; 45 V VRWM matches typical 12 V automotive supply derating. | Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Front-end transient suppressor on 4–20 mA or 0–10 V output lines. Use Value: 175 °C junction rating supports operation near hot motor drives; 200 W pulse rating handles field-service ESD events during maintenance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45A-E3/57T | DO-214AC (SMA) package; 4.5 mm × 2.7 mm × 2.2 mm; 1000 W PPP (8/20 μs); 73 V VC at 12.3 A | Higher power handling but larger footprint and higher capacitance (250 pF); not AEC-Q101 qualified | Select when surge energy exceeds 200 W and board space allows SMA package |
| TPSMD45CA | Bi-directional configuration; same DO-219AB package; 73.5 V VC at 2.8 A; 170 pF capacitance | Supports AC-coupled or floating signal lines; lacks AEC-Q101 certification per datasheet Rev. C | Choose for bidirectional protection needs where automotive qualification is not mandatory |
Compared with SMAJ45A-E3/57T and TPSMD45CA, SMF45A-HM3-08 offers the smallest footprint, lowest capacitance, and certified AEC-Q101 qualification-making it optimal for space-constrained, high-speed, automotive-grade ESD protection.
Availability
SMF45A-HM3-08 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and USB 2.0 peripheral designs requiring stable component supply and long-term lifecycle support.
Supply support for SMF45A-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 diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade validation.
The SMF series belongs to Vishay's eSMP® family of surface-mount TVS diodes, engineered specifically for high-density PCB layouts in automotive, industrial, and consumer electronics where low capacitance, fast response, and AEC-Q101 compliance are critical.
FAQ
What is the clamping voltage of SMF45A-HM3-08 under a 10/1000 μs surge?
The SMF45A-HM3-08 has a maximum clamping voltage (VC) of 72.7 V at 2.8 A peak pulse current with a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 test conditions and ensures downstream 3.3 V or 5 V ICs remain within safe operating limits during transient events. The SMF45A-HM3-08 achieves this with low incremental surge resistance and fast avalanche response.
Is SMF45A-HM3-08 qualified to AEC-Q101?
Yes, SMF45A-HM3-08 is AEC-Q101 qualified, as confirmed in Vishay document 85881 Rev. 2.4. It undergoes stress tests including high-temperature operating life, temperature cycling, and ESD human body model (H3B > 8 kV). This qualification makes SMF45A-HM3-08 suitable for automotive powertrain, body electronics, and ADAS subsystems where reliability is mandated.
What is the capacitance of SMF45A-HM3-08 and how does it affect high-speed signals?
The SMF45A-HM3-08 exhibits 162 pF typical capacitance at 0 V and 1 MHz. This low value minimizes signal attenuation and timing skew on interfaces such as USB 2.0 (480 Mbps) and LIN bus. Unlike higher-capacitance alternatives (>250 pF), the SMF45A-HM3-08 preserves edge rates and eye diagram integrity without requiring layout compensation. The SMF45A-HM3-08 datasheet confirms this value across production lots.
Does SMF45A-HM3-08 support automated assembly processes?
Yes, SMF45A-HM3-08 is fully compatible with standard SMT processes: it is wave and reflow solderable per J-STD-020, rated MSL level 1 (unlimited floor life), and features a DO-219AB package with defined footprint recommendations. Its 1.08 mm height and cathode-bar orientation simplify optical recognition in pick-and-place machines. The SMF45A-HM3-08 tape-and-reel packaging (8 mm width, 3K per 7″ reel) aligns with industry-standard feeders.
What is the maximum operating temperature range for SMF45A-HM3-08?
The SMF45A-HM3-08 is specified for an operating temperature range of -65 °C to +175 °C, matching the junction temperature limit. This range supports deployment in under-hood automotive locations, industrial motor controls, and outdoor equipment exposed to thermal extremes. The SMF45A-HM3-08 maintains stable clamping performance and leakage current (<0.1 μA at 45 V) across this full span, as verified in Vishay's thermal characterization data.
SMF45A-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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 2.8A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 162pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF45A-HM3-08 FAQ
1.How can I place an order for SMF45A-HM3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF45A-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 SMF45A-HM3-08 reliable?
The price and inventory of SMF45A-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 SMF45A-HM3-08 is usually 5 days.
3.What payment methods are accepted for SMF45A-HM3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF45A-HM3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF45A-HM3-08?
SMF45A-HM3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF45A-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 SMF45A-HM3-08?
For technical support, including SMF45A-HM3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF45A-HM3-08 requirements.
6.How does Aetrix verify that SMF45A-HM3-08 is sourced from the original manufacturer or authorized distributors?
All SMF45A-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 SMF45A-HM3-08 meets industry standards.
7.What is the process for return or replacement of SMF45A-HM3-08?
All SMF45A-HM3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF45A-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 SMF45A-HM3-08 part is unused and in its original packaging.
Return procedure for SMF45A-HM3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF45A-HM3-08 Tags
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