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Vishay General Semiconductor - Diodes Division SMF30A-M3-18
- Part No.:
- SMF30A-M3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF30A-M3-18.pdf
- Description:
- TVS DIODE 30VWM 48.4VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:3,996
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Product details
Overview
SMF30A-M3-18 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in DO-219AB (SOD-123W) package, designed for clamping transient overvoltages on data and signal lines. It features a 30 V stand-off voltage (VRWM), 33.3 V minimum breakdown voltage (VBR), 4.1 A peak pulse current (IPPM) under 10/1000 μs waveform, 48.4 V maximum clamping voltage (VC) at IPPM, and 207 pF typical junction capacitance at 0 V - optimized for USB 2.0, HDMI, and industrial I/O port protection.
For engineers reviewing the SMF30A-M3-18 datasheet, SMF30A-M3-18 pinout, SMF30A-M3-18 application, or SMF30A-M3-18 equivalent, this device is selected for high-reliability ESD suppression in automotive infotainment interfaces, industrial sensor signal conditioning, and ruggedized serial communication lines where low clamping voltage and AEC-Q101 qualification are critical.
Technical Context
The SMF30A-M3-18 operates as a single-channel unidirectional TVS diode with avalanche breakdown behavior, providing fast response (<1 ns) to ESD events per IEC 61000-4-2 (±30 kV contact/air). Its low incremental surge resistance ensures minimal voltage overshoot during transient suppression.
Designed for mounting on epoxy-glass PCBs with 3 mm × 3 mm Cu pads, it delivers 180 K/W junction-to-ambient thermal resistance and supports continuous operation from –65 °C to +175 °C - meeting AEC-Q101 stress test requirements including HBM >8 kV and robust surge immunity up to 1000 W (8/20 μs).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 30 V - maximum continuous reverse operating voltage before leakage exceeds 0.1 μA; defines safe signal swing range for protected line. |
| Breakdown Voltage (VBR) | 33.3–36.9 V at 1 mA - guaranteed avalanche initiation threshold; ensures predictable turn-on during transients. |
| Clamping Voltage (VC) | 48.4 V max at 4.1 A (10/1000 μs) - limits downstream IC voltage exposure during surge; enables compatibility with 3.3 V/5 V logic rails. |
| Junction Capacitance (CD) | 207 pF at 0 V, 1 MHz - impacts high-speed signal integrity; suitable for ≤480 Mbps USB 2.0 but not USB 3.0 or PCIe. |
| ESD Rating | ±30 kV contact & air discharge (IEC 61000-4-2) - exceeds Level 4 immunity requirement for industrial and automotive end equipment. |
| Package | DO-219AB (SOD-123W) - 3.9 × 1.9 × 1.08 mm low-profile outline compatible with automated SMT assembly and reflow profiles up to 260 °C. |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing. |
Pinout & Package
SMF30A-M3-18 uses the DO-219AB (SOD-123W) surface-mount package: cathode-bar marked, single-diode configuration with two terminals. The package measures 3.9 mm length × 1.9 mm width × 1.08 mm height and is rated MSL level 1 (unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Input/line side connection | Connected to signal trace requiring ESD protection; carries normal signal current and diverts surge to ground via cathode. |
| Cathode (bar-marked end) | Ground reference terminal | Must be routed to low-impedance system ground plane; determines clamping reference and defines unidirectional conduction path. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Supports repeated low-duty-cycle surges in industrial control I/O without thermal runaway. |
| Low clamping voltage (48.4 V @ 4.1 A) | Protects 3.3 V and 5 V interface ICs (e.g., UART transceivers, CAN controllers) from destructive overvoltage. |
| "Low Noise" fast-response technology | Sub-nanosecond response time minimizes voltage overshoot during ESD events, preserving signal fidelity. |
| AEC-Q101 qualified | Validated for automotive under-hood and infotainment applications requiring extended temperature and reliability compliance. |
| SOD-123W footprint compatibility | Enables drop-in replacement of legacy SOD-123 devices while offering improved power handling and thermal performance. |
Applications
| Automotive Infotainment Interface | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Protecting HDMI and USB 2.0 data lines in head-unit display modules exposed to ESD during connector mating/unmating. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed inline between connector and PHY IC to clamp transients before reaching serializer/deserializer. Use Value: Prevents latch-up or gate oxide damage in HDMI receiver ICs by limiting voltage to ≤48.4 V during ±30 kV ESD strikes. |
Use Scenario: Shielding 4–20 mA analog sensor outputs and RS-485 differential pairs in factory-floor PLC I/O modules. IC Role / Device Role / Timing Role: Standoff-clamp TVS on each signal line, referenced to chassis ground, to absorb induced lightning surges and cable discharge events. Use Value: Maintains signal accuracy under harsh EMI environments by suppressing transients within 1 ns while adding only 207 pF loading. |
| Medical Diagnostic Equipment Port | Ruggedized Serial Communication Line |
Use Scenario: Safeguarding USB ports on portable ultrasound and patient monitor devices subject to clinical ESD protocols. IC Role / Device Role / Timing Role: Primary ESD suppressor on VBUS and D+/D− lines, coordinated with secondary filtering for IEC 60601-1-2 compliance. Use Value: Enables pass-rate on ±30 kV contact discharge testing without compromising USB 2.0 eye diagram integrity. |
Use Scenario: Protecting CAN FD and LIN bus nodes in agricultural machinery control units operating in high-vibration, high-humidity conditions. IC Role / Device Role / Timing Role: Line-to-ground TVS on CAN_H/CAN_L, leveraging unidirectional architecture to avoid DC bias disruption. Use Value: Survives repeated 1000 W (8/20 μs) surges per IEC 61000-4-5 while maintaining <0.1 μA leakage at 30 V operating voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30A-E3/5A (Vishay) | Higher IPPM (12.3 A), higher VC (49.3 V), SMA (DO-214AC) package (4.5 × 2.7 mm) - 2.3× larger footprint. | Better suited for higher-energy surges (e.g., AC mains coupling) but incompatible with space-constrained layouts. | Select when surge energy exceeds 200 W and board area allows SMA package; not pin-compatible with SMF30A-M3-18. |
| TPD2E001DRYR (TI) | Lower capacitance (11 pF), dual-channel, 5 V VRWM - designed for high-speed data lines like USB 3.0 and DisplayPort. | Not suitable for 30 V signal rails; requires redesign for voltage rating and channel count. | Choose for ultra-low-capacitance protection on >1 Gbps interfaces; not a functional substitute for SMF30A-M3-18's 30 V standoff capability. |
Compared with SMAJ30A-E3/5A and TPD2E001DRYR, SMF30A-M3-18 uniquely balances 30 V standoff, 207 pF capacitance, and DO-219AB compactness - making it optimal for cost-sensitive, space-limited 30 V industrial I/O and automotive signal line protection where moderate bandwidth suffices.
Availability
SMF30A-M3-18 is available at Aetrix Electronics and suitable for automotive infotainment interfaces, industrial sensor signal conditioning, and ruggedized serial communication lines requiring stable component supply and AEC-Q101-compliant ESD protection.
Supply support for SMF30A-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 targets high-volume ESD protection in space-constrained applications, combining AEC-Q101 qualification, low-profile packaging, and precise clamping performance for signal integrity-critical interfaces.
FAQ
What is the maximum clamping voltage of the SMF30A-M3-18 under standard test conditions?
The SMF30A-M3-18 has a maximum clamping voltage (VC) of 48.4 V when subjected to a 10/1000 μs waveform at its rated peak pulse current of 4.1 A. This value is measured per IEC 61000-4-5 and ensures downstream 3.3 V or 5 V ICs remain within safe operating voltage limits during transient events. The SMF30A-M3-18 achieves this clamping performance while maintaining low leakage (<0.1 μA at 30 V).
Is the SMF30A-M3-18 suitable for automotive applications?
Yes, the SMF30A-M3-18 is AEC-Q101 qualified and rated for operation from –65 °C to +175 °C, making it suitable for under-hood and infotainment applications. It meets stringent automotive ESD requirements including ±30 kV contact and air discharge per IEC 61000-4-2. The SMF30A-M3-18 is commonly deployed on CAN, LIN, and USB lines in automotive ECUs where reliability across temperature extremes is mandatory.
What package type does the SMF30A-M3-18 use, and is it compatible with standard SMT processes?
The SMF30A-M3-18 uses the DO-219AB (SOD-123W) package - measuring 3.9 mm × 1.9 mm × 1.08 mm - and is fully compatible with standard reflow soldering profiles, including peak temperatures up to 260 °C. Its MSL level 1 rating means unlimited floor life when stored properly, and the cathode bar marking enables automated optical inspection. The SMF30A-M3-18 footprint aligns with IPC-7351B recommendations for SOD-123W.
How does the junction capacitance of the SMF30A-M3-18 affect high-speed signal integrity?
The SMF30A-M3-18 exhibits 207 pF typical junction capacitance at 0 V and 1 MHz, which is appropriate for USB 2.0 (480 Mbps), RS-485, and CAN FD signals but unsuitable for USB 3.0 (>5 Gbps) or PCIe Gen3+ due to excessive signal attenuation and jitter. Designers must verify eye diagram margins when using the SMF30A-M3-18 on high-speed lines; the SMF30A-M3-18's capacitance remains stable below 10 V reverse bias.
What is the standoff voltage rating of the SMF30A-M3-18, and how does it relate to circuit design?
The SMF30A-M3-18 has a maximum stand-off voltage (VRWM) of 30 V - the highest DC or continuous peak AC voltage it can block without exceeding 0.1 μA leakage current. This rating defines the upper limit of normal signal swing on the protected line; for example, it safely guards 24 V industrial control signals or 28 V automotive battery-supplied interfaces. Exceeding 30 V risks premature conduction and increased power dissipation in the SMF30A-M3-18.
SMF30A-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):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 4.1A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 207pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF30A-M3-18 FAQ
1.How can I place an order for SMF30A-M3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF30A-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 SMF30A-M3-18 reliable?
The price and inventory of SMF30A-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 SMF30A-M3-18 is usually 5 days.
3.What payment methods are accepted for SMF30A-M3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF30A-M3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF30A-M3-18?
SMF30A-M3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF30A-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 SMF30A-M3-18?
For technical support, including SMF30A-M3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF30A-M3-18 requirements.
6.How does Aetrix verify that SMF30A-M3-18 is sourced from the original manufacturer or authorized distributors?
All SMF30A-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 SMF30A-M3-18 meets industry standards.
7.What is the process for return or replacement of SMF30A-M3-18?
All SMF30A-M3-18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF30A-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 SMF30A-M3-18 part is unused and in its original packaging.
Return procedure for SMF30A-M3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF30A-M3-18 Tags
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