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Vishay SMF45A-HM3_A18
- Part No.:
- SMF45A-HM3_A18
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF45A-HM3_A18.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,500
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Product details
Overview
SMF45A-HM3_A18 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 45 V standoff voltage (VRWM), 50 V minimum breakdown voltage (VBR), 72.7 V maximum clamping voltage at 2.8 A peak pulse current, ±30 kV IEC 61000-4-2 ESD immunity, and 200 W peak pulse power (10/1000 μs). It is used to safeguard USB 2.0, HDMI, and industrial sensor interfaces against electrostatic discharge.
For engineers reviewing the SMF45A-HM3_A18 datasheet, SMF45A-HM3_A18 pinout, SMF45A-HM3_A18 application, or SMF45A-HM3_A18 equivalent, this device delivers verified low-capacitance (162 pF at 0 V), AEC-Q101 qualified reliability, and SOD-123W-compatible footprint - critical for automotive infotainment and industrial I/O port hardening where fast response time and low leakage (<0.1 μA at VRWM) are mandatory.
Technical Context
This unidirectional TVS diode operates in avalanche mode during overvoltage events, with a typical junction capacitance of 162 pF at 0 V and <100 pF at 10 V reverse bias - enabling use in 480 Mbps USB 2.0 signal paths without signal integrity degradation. Its 1.08 mm height and DO-219AB outline support automated placement and reflow soldering per J-STD-020 MSL level 1.
The device meets AEC-Q101 stress requirements including human body model >8 kV, and achieves ±30 kV contact/air discharge per IEC 61000-4-2. Its thermal resistance (RthJA = 180 K/W on 3 mm × 3 mm Cu pads) supports sustained operation across -65 °C to +175 °C ambient range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 45 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 36 V nominal systems. |
| Breakdown Voltage (VBR) | 50–55.3 V at 1 mA - Confirmed avalanche initiation threshold; ensures predictable turn-on during transients. |
| Clamping Voltage (VC) | 72.7 V at 2.8 A (10/1000 μs) - Peak voltage seen by protected circuit under rated surge; limits downstream IC stress. |
| Junction Capacitance (CD) | 162 pF at 0 V, f = 1 MHz - Low enough for USB 2.0 full-speed signaling; drops to ~60 pF at 10 V bias. |
| ESD Rating | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - Exceeds Level 4 immunity requirement for end-equipment compliance. |
| Leakage Current (IR) | ≤ 0.1 μA at 45 V - Minimizes standby power loss and avoids false triggering in high-impedance sensor nodes. |
| Package | DO-219AB (SOD-123W compatible) - Industry-standard low-profile outline (3.9 × 1.9 × 1.08 mm); enables high-density PCB layout. |
Pinout & Package
SMF45A-HM3_A18 uses the DO-219AB (SMF) package: a two-terminal, cathode-marked, surface-mount plastic case with gull-wing leads. The cathode bar identifies Terminal 2; Terminal 1 is anode. Compatible with standard SOD-123W footprint and reflow profiles (peak ≤260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Terminal 1) | Input/Line side connection | Connected to signal line requiring protection; conducts during forward surge (e.g., miswiring). |
| Cathode (Terminal 2, marked) | Ground reference node | Connected to system ground or low-impedance return path; provides low-impedance shunt during reverse transient events. |
Key Features
| Feature | Design Value |
|---|---|
| Low-clamp architecture | 72.7 V clamping at 2.8 A ensures protected ICs see sub-75 V stress - critical for 3.3 V/5 V logic rail safety margins. |
| "Low Noise" fast response | Sub-nanosecond turn-on enables suppression of ESD pulses before propagation into sensitive receivers (e.g., USB PHYs). |
| AEC-Q101 qualification | Validated for automotive applications including infotainment displays and body control modules requiring extended temperature and reliability assurance. |
| Wave/reflow solderable | Compatible with standard Pb-free reflow profiles (J-STD-020 MSL level 1); no special handling or pre-baking required. |
| UL 94 V-0 molding compound | Flame-retardant encapsulation meets IPC-CC-830B and automotive flammability standards for enclosed modules. |
Applications
| Automotive Infotainment Display Port | Industrial PLC Digital Input Module |
|---|---|
|
Use Scenario: Protecting HDMI and USB 2.0 ports on head-unit displays from ESD during service or user interaction. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed inline between connector and PHY IC to clamp transients before they reach receiver inputs. Use Value: 162 pF capacitance preserves signal integrity up to 480 Mbps; ±30 kV rating exceeds ISO 10605 requirements for vehicle interior ports. |
Use Scenario: Hardening 24 V digital input channels on programmable logic controllers exposed to field wiring surges and operator ESD. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between input line and chassis ground to divert induced transients away from optocoupler input stages. Use Value: 45 V VRWM aligns with 24 V industrial bus tolerances; 72.7 V clamping prevents damage to 5 V logic-level interface circuitry. |
| Medical Patient Monitor Sensor Interface | Smart Building HVAC Control Node |
|
Use Scenario: Shielding analog and digital sensor lines (e.g., temperature, SpO₂) from ESD during clinical handling or cable coupling. IC Role / Device Role / Timing Role: Low-leakage (≤0.1 μA) TVS placed at board edge to suppress fast transients without loading high-impedance sensor outputs. Use Value: Sub-μA leakage avoids DC offset errors in precision front-end amplifiers; AEC-Q101 qualification supports IEC 60601-1 risk management. |
Use Scenario: Securing RS-485 and CAN FD communication lines in distributed HVAC controllers installed in electrically noisy mechanical rooms. IC Role / Device Role / Timing Role: Primary ESD clamp on differential bus lines, coordinated with common-mode chokes and secondary TVS arrays. Use Value: DO-219AB package allows dense routing near connectors; 200 W pulse rating handles repetitive switching noise from nearby VFDs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45A-E3/57T (Vishay) | Higher clamping voltage (88 V at 3.1 A), SMA (DO-214AC) package (4.5 × 2.7 × 2.2 mm), 200 W rating same. | Larger footprint and higher VC reduce suitability for space-constrained USB/HDMI layouts but improve thermal dissipation in high-power industrial zones. | Select SMAJ45A-E3/57T when board area permits and higher surge margin is needed beyond 2.8 A. |
| TPD2E001DRYR (TI) | Bi-directional, 12 pF @ 0 V, 5 V VRWM, 15 kV ESD rating, DRY (SOT-553) 5-pin package with integrated RC filter. | Designed for ultra-low-capacitance high-speed data (USB 3.0, MIPI), not direct replacement for 45 V standoff or unidirectional clamping needs. | Choose TPD2E001DRYR only for <5 V, high-frequency interfaces requiring sub-15 pF; not suitable for 24/36 V industrial or automotive supply rails. |
Compared with SMAJ45A-E3/57T and TPD2E001DRYR, SMF45A-HM3_A18 uniquely balances 45 V standoff, 162 pF capacitance, and compact DO-219AB packaging - making it optimal for cost-sensitive, space-limited 24–48 V data port protection where moderate bandwidth and robust ESD immunity are prioritized over ultra-low capacitance or bi-directionality.
Availability
SMF45A-HM3_A18 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and medical sensor interfaces requiring stable component supply and AEC-Q101-qualified ESD protection.
Supply support for SMF45A-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 Semiconductors is a global leader in discrete semiconductors, specializing in power management, sensing, and protection components with emphasis on reliability, efficiency, and automotive-grade qualification.
The SMF series targets high-reliability transient suppression in automotive, industrial, and medical electronics - engineered for low-profile mounting, fast response, and consistent clamping performance across extreme temperature ranges.
FAQ
What is the maximum clamping voltage of SMF45A-HM3_A18 under standard test conditions?
The SMF45A-HM3_A18 has a maximum clamping voltage (VC) of 72.7 V when subjected to a 10/1000 μs waveform at 2.8 A peak pulse current. This value is measured per IEC 61000-4-5 and defines the upper voltage limit imposed on protected circuitry during surge events. The clamping behavior is repeatable and stable across its full operating temperature range (-65 °C to +175 °C), ensuring consistent protection in harsh environments where SMF45A-HM3_A18 is deployed.
Is SMF45A-HM3_A18 suitable for protecting USB 2.0 data lines?
Yes, SMF45A-HM3_A18 is suitable for USB 2.0 data line protection due to its 162 pF junction capacitance at 0 V and reduced capacitance (~60 pF) at 10 V reverse bias - well within the 150–200 pF budget for full-speed (480 Mbps) signaling. Its unidirectional configuration matches typical USB line grounding schemes, and its ±30 kV ESD rating exceeds IEC 61000-4-2 Level 4 requirements. SMF45A-HM3_A18 must be placed close to the connector with minimized trace inductance to preserve effectiveness.
Does SMF45A-HM3_A18 meet AEC-Q101 qualification?
Yes, SMF45A-HM3_A18 is AEC-Q101 qualified, having passed stress tests including human body model (>8 kV), temperature cycling, and high-temperature operating life. This qualification confirms its suitability for automotive applications such as infotainment display ports, body control modules, and telematics units where long-term reliability under thermal and mechanical stress is mandatory. The AEC-Q101 status applies specifically to the SMF45A-HM3_A18 variant as documented in Vishay's official qualification reports.
What is the package type and dimensions of SMF45A-HM3_A18?
SMF45A-HM3_A18 uses the DO-219AB (SMF) package: 3.9 mm length × 1.9 mm width × 1.08 mm height, with gull-wing terminals and cathode bar marking. It is mechanically and footprint-compatible with SOD-123W, enabling drop-in use in existing designs. The package supports wave and reflow soldering per J-STD-020 MSL level 1, with peak temperature tolerance up to 260 °C. This compact outline makes SMF45A-HM3_A18 ideal for high-density PCBs in automotive and industrial modules.
How does the leakage current of SMF45A-HM3_A18 impact high-impedance sensor circuits?
SMF45A-HM3_A18 exhibits ≤0.1 μA reverse leakage current at its 45 V standoff voltage (VRWM), minimizing DC loading on high-impedance sensor nodes such as thermistor dividers or pH electrode amplifiers. This low IR ensures negligible voltage error or drift in precision analog front-ends, preserving measurement accuracy. In battery-powered medical sensors where quiescent current matters, SMF45A-HM3_A18 contributes less than 100 nA per protection channel - a design advantage confirmed in Vishay's electrical characteristics table for SMF45A-HM3_A18.
SMF45A-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):
- 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 (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF45A-HM3_A18 FAQ
1.How can I place an order for SMF45A-HM3_A18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF45A-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 SMF45A-HM3_A18 reliable?
The price and inventory of SMF45A-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 SMF45A-HM3_A18 is usually 5 days.
3.What payment methods are accepted for SMF45A-HM3_A18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF45A-HM3_A18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF45A-HM3_A18?
SMF45A-HM3_A18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF45A-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 SMF45A-HM3_A18?
For technical support, including SMF45A-HM3_A18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF45A-HM3_A18 requirements.
6.How does Aetrix verify that SMF45A-HM3_A18 is sourced from the original manufacturer or authorized distributors?
All SMF45A-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 SMF45A-HM3_A18 meets industry standards.
7.What is the process for return or replacement of SMF45A-HM3_A18?
All SMF45A-HM3_A18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF45A-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 SMF45A-HM3_A18 part is unused and in its original packaging.
Return procedure for SMF45A-HM3_A18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF45A-HM3_A18 Tags
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