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Vishay General Semiconductor - Diodes Division SMF43A-M3-18
- Part No.:
- SMF43A-M3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF43A-M3-18.pdf
- Description:
- TVS DIODE 43VWM 69.4VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:6,546
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Product details
Overview
SMF43A-M3-18 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in DO-219AB (SOD-123W) package, designed for transient voltage suppression in high-speed data lines. It features a 43 V stand-off voltage (VRWM), 69.4 V maximum clamping voltage at 2.9 A peak pulse current, 165 pF typical junction capacitance at 0 V, ±30 kV IEC 61000-4-2 ESD immunity, and 200 W peak pulse power (10/1000 μs).
For engineers reviewing the SMF43A-M3-18 datasheet, SMF43A-M3-18 pinout, SMF43A-M3-18 application, or SMF43A-M3-18 equivalent, this device is selected for robust overvoltage protection in automotive infotainment interfaces, USB 2.0 signal lines, and industrial sensor I/O where low clamping voltage and sub-1 ns response time are critical to safeguarding sensitive transceivers.
Technical Context
This unidirectional TVS diode operates as a shunt-type transient suppressor, conducting above its reverse breakdown voltage (47.8–52.9 V) to clamp surge energy away from protected circuitry. Its low incremental surge resistance ensures minimal voltage overshoot during fast transients, while the "Low Noise" technology enables sub-nanosecond response to ESD events.
Designed for AEC-Q101 qualification (available in HE3 variants), the SMF43A-M3-18 supports wave and reflow soldering per J-STD-020 MSL level 1, with thermal resistance RthJA = 180 K/W on standard epoxy-glass PCBs. It is rated for continuous operation from –65 °C to +175 °C and withstands 50 A non-repetitive forward surge current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 43 V - Maximum continuous reverse voltage before significant leakage; defines operating margin for 36–40 V nominal bus systems. |
| Clamping Voltage (VC) | 69.4 V at IPPM = 2.9 A (10/1000 μs) - Peak voltage seen by protected IC during worst-case surge; limits stress on downstream logic. |
| Junction Capacitance | 165 pF at VR = 0 V, f = 1 MHz - Low enough for USB 2.0 (480 Mbps) signal integrity without excessive rise-time degradation. |
| ESD Withstand | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - Exceeds Level 4 immunity requirements for industrial and automotive end-equipment. |
| Peak Pulse Power | 200 W (10/1000 μs) - Sustains short-duration surges common in board-level ESD events without thermal runaway. |
| Operating Temperature | –65 °C to +175 °C - Enables deployment in under-hood automotive modules and high-ambient industrial controllers. |
Pinout & Package
SMF43A-M3-18 uses the DO-219AB (SOD-123W) surface-mount package: 3.9 mm × 1.9 mm × 1.08 mm, low-profile, cathode-bar marked, compatible with standard SOD-123 footprint. Mold compound is UL 94 V-0 rated; terminals are tin-plated, lead (Pb)-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to signal line or power rail requiring protection; conducts transient current toward cathode during overvoltage. |
| Cathode | Ground reference | Connected to system ground or low-impedance return path; establishes clamping reference and provides discharge path for ESD energy. |
Key Features
| Feature | Design Value |
|---|---|
| Sub-nanosecond response | Enables effective suppression of IEC 61000-4-2 ESD pulses (rise time < 1 ns) before protected ICs experience latch-up or gate oxide damage. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage stress on downstream components compared to higher-ratio TVS devices, improving system reliability. |
| AEC-Q101 qualified option | HE3 variants meet automotive-grade reliability testing (HBM > 8 kV), supporting use in infotainment, ADAS camera links, and body control modules. |
| Reflow/wave solder compatible | Rated for peak reflow temperature up to 260 °C (J-STD-020), enabling integration into standard high-volume PCB assembly processes. |
Applications
| Automotive Infotainment Display Interface | Industrial RS-485 Sensor Network |
|---|---|
Use Scenario: Protecting LVDS or FPD-Link III video data lines between head unit and TFT display against ESD from user touch and cable coupling. IC Role / Device Role / Timing Role: Shunt-type transient voltage suppressor placed directly at connector entry point, clamping fast transients before they reach serializer/deserializer ICs. Use Value: 165 pF capacitance avoids signal integrity loss at 1+ Gbps rates; 69.4 V clamping prevents damage to 45 V-rated receiver inputs. | Use Scenario: Safeguarding RS-485 transceiver I/O pins in factory-floor temperature sensors exposed to static discharge from maintenance personnel. IC Role / Device Role / Timing Role: Bidirectional protection not required-unidirectional SMF43A-M3-18 used on VCC-supplied data lines where ground-referenced surges dominate. Use Value: ±30 kV ESD rating exceeds IEC 61000-4-2 Level 4; 200 W pulse power handles induced lightning surges coupled via long cable runs. |
| USB 2.0 Host Port Protection | 4–20 mA Loop-Powered Transmitter |
Use Scenario: Shielding D+ and D− lines of embedded USB host controllers in medical diagnostic equipment from accidental ESD during cable insertion. IC Role / Device Role / Timing Role: Low-capacitance TVS placed adjacent to USB connector, minimizing stub length to preserve 480 Mbps eye diagram integrity. Use Value: 165 pF capacitance adds <1% rise-time degradation; 43 V VRWM allows safe operation with 5 V VBUS and 3.3 V logic rails. | Use Scenario: Protecting analog output stage of loop-powered pressure transmitter connected to PLC I/O modules in oil & gas control cabinets. IC Role / Device Role / Timing Role: Unidirectional clamp on 24 V supply rail input, absorbing load-dump transients and electrostatic discharges entering via field wiring. Use Value: 69.4 V clamping ensures protected 24 V regulator remains below absolute max rating; 175 °C junction rating supports operation in hot enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43A-E3/57T | DO-214AC (SMA) package; larger footprint (4.5 × 2.7 mm); 70 V clamping at 2.8 A; 200 W rating same. | Less suitable for space-constrained USB or LVDS layouts; better thermal dissipation for higher average surge duty cycles. | Select SMAJ43A-E3/57T when board layout permits larger package and higher thermal mass is needed for repetitive surge environments. |
| TPSMD43A | DO-214AB (SMC) package; 4.5 × 2.7 mm; 70.1 V clamping at 2.9 A; 150 pF capacitance; also ±30 kV ESD rated. | Lower capacitance benefits higher-speed interfaces (e.g., HDMI 1.4); less ideal for ultra-dense routing due to larger size. | Choose TPSMD43A for designs prioritizing lowest possible capacitance in non-footprint-constrained applications like industrial backplanes. |
Compared with SMAJ43A-E3/57T and TPSMD43A, SMF43A-M3-18 offers the smallest footprint (DO-219AB) and best balance of low capacitance, tight clamping, and AEC-Q101 readiness-making it optimal for automotive and portable electronics where board area and signal fidelity are critical.
Availability
SMF43A-M3-18 is available at Aetrix Electronics and suitable for automotive infotainment interfaces, industrial RS-485 networks, and USB 2.0 host ports requiring stable component supply across production lifecycles.
Supply support for SMF43A-M3-18 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 belongs to Vishay's eSMP® family of surface-mount TVS diodes, engineered specifically for space-constrained, high-speed ESD protection in automotive and industrial electronics where low capacitance and AEC-Q101 compliance are mandatory.
FAQ
What is the maximum clamping voltage of SMF43A-M3-18 under standard test conditions?
The SMF43A-M3-18 has a maximum reverse clamping voltage (VC) of 69.4 V when subjected to a 10/1000 μs waveform with a peak pulse current (IPPM) of 2.9 A. This value is measured per IEC 61000-4-5 and guarantees the protected circuit sees no more than 69.4 V during such transients. The SMF43A-M3-18 maintains this performance across its full operating temperature range of –65 °C to +175 °C.
Is SMF43A-M3-18 suitable for protecting USB 2.0 data lines?
Yes, SMF43A-M3-18 is suitable for USB 2.0 data line protection due to its 165 pF typical junction capacitance at 0 V and 1 MHz, which introduces negligible signal distortion at 480 Mbps. Its 43 V stand-off voltage safely accommodates 5 V VBUS and 3.3 V logic levels, while ±30 kV IEC 61000-4-2 ESD rating exceeds USB compliance requirements. The SMF43A-M3-18 must be placed within 3 mm of the connector for optimal effectiveness.
Does SMF43A-M3-18 meet AEC-Q101 qualification?
The base SMF43A-M3-18 is RoHS-compliant and lead-free but is not itself AEC-Q101 qualified; however, the variant SMF43A-HE3_A18 is fully AEC-Q101 qualified per Rev. 2.4 of the Vishay datasheet (Document Number: 85881). That version undergoes extended reliability testing including HBM > 8 kV and high-temperature operating life. For automotive applications, specify the HE3_A suffix to ensure SMF43A-M3-18 meets AEC-Q101 requirements.
What is the package type and dimensions of SMF43A-M3-18?
SMF43A-M3-18 uses the DO-219AB package (also known as SOD-123W), measuring 3.9 mm in length, 1.9 mm in width, and 1.08 mm in height. It features a cathode bar marking, low-profile profile optimized for automated placement, and is compatible with standard SOD-123 footprints. The SMF43A-M3-18 package is UL 94 V-0 rated and supports both wave and reflow soldering per J-STD-020 MSL level 1.
How does SMF43A-M3-18 compare to SMF45A-M3-18 in terms of voltage ratings?
SMF43A-M3-18 has a stand-off voltage (VRWM) of 43 V and breakdown voltage range of 47.8–52.9 V, whereas SMF45A-M3-18 specifies VRWM = 45 V and VBR = 50–55.3 V. The 2 V difference in VRWM makes SMF43A-M3-18 preferable for 42–44 V nominal systems (e.g., 24 V automotive with 100% tolerance), while SMF45A-M3-18 suits tighter 45 V rails. Both share identical package, capacitance (162 pF), and ESD rating; the SMF43A-M3-18 clamps at 69.4 V vs. 72.7 V for SMF45A-M3-18.
SMF43A-M3-18 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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 2.9A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 165pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF43A-M3-18 FAQ
1.How can I place an order for SMF43A-M3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF43A-M3-18 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 SMF43A-M3-18 reliable?
The price and inventory of SMF43A-M3-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF43A-M3-18 is usually 5 days.
3.What payment methods are accepted for SMF43A-M3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF43A-M3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF43A-M3-18?
SMF43A-M3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF43A-M3-18 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 SMF43A-M3-18?
For technical support, including SMF43A-M3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF43A-M3-18 requirements.
6.How does Aetrix verify that SMF43A-M3-18 is sourced from the original manufacturer or authorized distributors?
All SMF43A-M3-18 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 SMF43A-M3-18 meets industry standards.
7.What is the process for return or replacement of SMF43A-M3-18?
All SMF43A-M3-18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF43A-M3-18, 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 SMF43A-M3-18 part is unused and in its original packaging.
Return procedure for SMF43A-M3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF43A-M3-18 Tags
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