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Vishay General Semiconductor - Diodes Division SMF43A-HM3-18
- Part No.:
- SMF43A-HM3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF43A-HM3-18.pdf
- Description:
- TVS DIODE 43VWM 69.4VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:8,989
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Product details
Overview
SMF43A-HM3-18 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for clamping transient overvoltages on signal or power lines. It features a 43 V stand-off voltage (VRWM), 69.4 A peak pulse current (IPPM) under 10/1000 μs waveform, 69.4 V maximum reverse clamping voltage (VC), and 165 pF typical junction capacitance at 0 V - optimized for high-speed data lines including USB 2.0, HDMI, and industrial I/O interfaces.
For engineers reviewing the SMF43A-HM3-18 datasheet, SMF43A-HM3-18 pinout, SMF43A-HM3-18 application, or SMF43A-HM3-18 equivalent, key selection criteria include its ±30 kV IEC 61000-4-2 ESD immunity, AEC-Q101 qualification, low 1.08 mm profile, and compatibility with automated SMT assembly using wave or reflow soldering per J-STD-020 MSL level 1.
Technical Context
The SMF43A-HM3-18 operates as a single-channel unidirectional TVS diode, leveraging silicon avalanche breakdown to clamp transients above its 47.8 V minimum reverse breakdown voltage (VBR). Its low incremental surge resistance ensures rapid response (<1 ns rise time) and stable clamping performance across temperature (–65 °C to +175 °C).
It complies with IEC 61000-4-2 (±30 kV contact/air discharge) and IEC 61000-4-5 (1000 W peak pulse power at 8/20 μs), while maintaining <0.1 μA leakage at VRWM and supporting 50 A non-repetitive forward surge current (IFSM) - enabling robust protection in automotive and industrial environments where thermal cycling and long-term reliability are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 43 V - maximum continuous operating voltage before clamping begins; defines safe operating margin for 36–42 V nominal bus systems. |
| Reverse Breakdown (VBR) | 47.8–52.9 V at 1 mA - tight tolerance ensures predictable turn-on during fast transients without premature conduction. |
| Clamping Voltage (VC) | 69.4 V at 2.9 A IPPM - limits downstream voltage stress during 10/1000 μs surges, protecting 70 V-rated ICs. |
| Junction Capacitance (CD) | 165 pF at 0 V, 1 MHz - low enough for USB 2.0 (480 Mbps) and CAN FD signal integrity, but not suitable for PCIe Gen3+. |
| ESD Immunity | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - exceeds Level 4 requirements, eliminating need for secondary board-level ESD mitigation. |
| Peak Pulse Power | 200 W at 10/1000 μs - supports repeated surge events in industrial control I/O with 0.01% duty cycle. |
| AEC-Q101 Qualified | Yes - validated for automotive applications including infotainment interfaces, body electronics, and ADAS sensor lines. |
Pinout & Package
SMF43A-HM3-18 uses the DO-219AB (SMF) package: low-profile, surface-mount, cathode-marked anode-cathode configuration. Dimensions: 3.9 mm × 1.9 mm × 1.08 mm. Compatible with SOD-123W footprint and IPC-7351B land pattern recommendations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side terminal | Connected to protected line (e.g., USB D+, HDMI TMDS+); conducts surge current toward cathode during overvoltage. |
| Cathode | Ground/reference terminal | Connected to system ground or low-impedance return path; establishes clamping reference and enables fast transient dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| "Low Noise" fast-response technology | Sub-nanosecond response time ensures clamping activation before sensitive ICs experience voltage overshoot. |
| 200 W peak pulse power (10/1000 μs) | Supports multiple surge events in industrial PLC I/O modules without degradation under specified duty cycle. |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing. |
| MSL level 1 moisture sensitivity | Enables unlimited floor life and standard reflow profiles up to 260 °C peak, reducing manufacturing constraints. |
| UL 94 V-0 molding compound | Meets flammability safety requirements for enclosed industrial enclosures and automotive cabin modules. |
Applications
| Industrial Sensor Interface | Automotive Infotainment Port |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in factory automation cabinets exposed to relay switching noise and ESD from maintenance personnel. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed at connector entry point to shunt transients before reaching ADC input or op-amp buffer. Use Value: 43 V VRWM matches 24 V DC supply rails; 165 pF capacitance avoids signal distortion on 10 kHz analog outputs. |
Use Scenario: Shielding USB 2.0 data lines in head unit docking ports from repeated ESD events during consumer device insertion/removal. IC Role / Device Role / Timing Role: Line-side ESD suppressor between USB connector and USB PHY, with cathode tied to chassis ground. Use Value: ±30 kV IEC 61000-4-2 rating prevents latch-up or damage to USB transceivers; low profile fits tight front-panel spacing. |
| Telecom Remote I/O Module | Smart Building HVAC Controller |
|
Use Scenario: Safeguarding RS-485 differential pairs in outdoor telecom cabinets subject to lightning-induced surges and field technician ESD. IC Role / Device Role / Timing Role: Paired unidirectional SMF43A-HM3-18 devices (one per line) referenced to common ground plane. Use Value: 69.4 V VC clamps induced surges below RS-485 receiver absolute max rating (±12 V common-mode + 60 V fault); 200 W rating handles 10/1000 μs coupling events. |
Use Scenario: Securing 0–10 V analog control inputs on HVAC zone controllers installed in commercial buildings with high foot traffic and static-prone flooring. IC Role / Device Role / Timing Role: Single-point protection at terminal block entry, with anode on signal line and cathode on local ground. Use Value: 43 V VRWM provides 3× margin over 10 V full-scale range; AEC-Q101 qualification ensures longevity in thermally cycled environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SP1003-040HTG | 40 V VRWM, 120 pF, SOD-323 package (1.7 × 1.25 × 0.95 mm) | Lower capacitance suits higher-speed interfaces (e.g., LVDS), but lower VRWM limits use to ≤36 V systems. | Select when signal bandwidth >100 MHz is required and 40 V standoff suffices. |
| ON Semiconductor SZ1.5SMC43A | 43 V VRWM, 1500 W peak power (8/20 μs), DO-214AB package (4.5 × 3.5 × 2.4 mm) | Higher power handling for lightning-surged AC lines, but larger size and higher capacitance (220 pF) limit high-speed use. | Select for mains-connected equipment or where PCB space allows larger footprint and higher clamping energy is needed. |
Compared with SP1003-040HTG and SZ1.5SMC43A, SMF43A-HM3-18 delivers optimal balance of compact DO-219AB form factor, 165 pF capacitance for USB 2.0, and AEC-Q101 qualification - making it preferred for space-constrained automotive and industrial edge nodes where both ESD robustness and signal fidelity matter.
Availability
SMF43A-HM3-18 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive infotainment ports, and smart building HVAC controllers requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant ESD protection.
Supply support for SMF43A-HM3-18 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 targets high-density, high-reliability ESD protection in space-constrained applications - engineered for AEC-Q101 compliance, low-profile mounting, and consistent clamping performance across extreme temperature ranges.
FAQ
What is the maximum clamping voltage of the SMF43A-HM3-18 under standard test conditions?
The SMF43A-HM3-18 has a maximum reverse clamping voltage (VC) of 69.4 V when subjected to its rated peak pulse current of 2.9 A using a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 and ensures downstream circuitry remains within safe voltage limits during transient events. The SMF43A-HM3-18 achieves this clamping performance while maintaining low leakage and fast response.
Is the SMF43A-HM3-18 suitable for automotive applications?
Yes, the SMF43A-HM3-18 is AEC-Q101 qualified, meaning it has passed rigorous stress tests for automotive-grade reliability including temperature cycling, high-temperature operating life, and ESD robustness. It is commonly deployed in automotive infotainment USB ports, body control module I/O lines, and ADAS sensor interfaces where 43 V standoff and ±30 kV ESD immunity are required. The SMF43A-HM3-18 meets these demands without derating.
What is the junction capacitance of the SMF43A-HM3-18 and how does it affect signal integrity?
The SMF43A-HM3-18 exhibits 165 pF typical junction capacitance at 0 V and 1 MHz. This value is low enough to preserve signal integrity on USB 2.0 (480 Mbps) and RS-485 links, but too high for PCIe Gen3+ or HDMI 2.0. For SMF43A-HM3-18, the 165 pF capacitance introduces minimal loading on 10–50 MHz analog or digital signals, making it appropriate for industrial I/O and automotive sensor buses.
Does the SMF43A-HM3-18 require special PCB layout considerations?
Yes - to maintain effective ESD suppression, the SMF43A-HM3-18 must be placed as close as possible to the protected connector or IC pin, with short, low-inductance traces to ground. The recommended footprint follows IPC-7351B for DO-219AB, and thermal pads should match Vishay's 1.3 mm × 1.3 mm recommendation. Ground plane integrity directly impacts SMF43A-HM3-18 clamping performance, especially above 100 MHz.
What packaging and reel options are available for the SMF43A-HM3-18?
The SMF43A-HM3-18 is supplied in 8 mm tape-and-reel format: 3,000 units per 7-inch reel (MOQ = 30,000) or 10,000 units per 13-inch reel (MOQ = 50,000). The "-18" suffix denotes the 13-inch reel option. All reels comply with EIA-481 standards and include moisture barrier bagging per J-STD-033 for MSL level 1 handling. Traceability data for each SMF43A-HM3-18 reel is provided upon request.
SMF43A-HM3-18 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:
- -
- Capacitance @ Frequency:
- 165pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF43A-HM3-18 FAQ
1.How can I place an order for SMF43A-HM3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF43A-HM3-18 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-HM3-18 reliable?
The price and inventory of SMF43A-HM3-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF43A-HM3-18 is usually 5 days.
3.What payment methods are accepted for SMF43A-HM3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF43A-HM3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF43A-HM3-18?
SMF43A-HM3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF43A-HM3-18 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-HM3-18?
For technical support, including SMF43A-HM3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF43A-HM3-18 requirements.
6.How does Aetrix verify that SMF43A-HM3-18 is sourced from the original manufacturer or authorized distributors?
All SMF43A-HM3-18 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-HM3-18 meets industry standards.
7.What is the process for return or replacement of SMF43A-HM3-18?
All SMF43A-HM3-18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF43A-HM3-18, 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-HM3-18 part is unused and in its original packaging.
Return procedure for SMF43A-HM3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF43A-HM3-18 Tags
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