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Vishay SMF30A-HM3_A18
- Part No.:
- SMF30A-HM3_A18
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF30A-HM3_A18.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,408
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Product details
Overview
SMF30A-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 and power rails. It features a 30 V stand-off voltage (VRWM), 48.4 A peak pulse current (IPPM) at 10/1000 μs, 48.4 V maximum clamping voltage (VC) at IPPM, ±30 kV IEC 61000-4-2 ESD immunity, and 200 W peak pulse power capability.
For engineers reviewing the SMF30A-HM3_A18 datasheet, SMF30A-HM3_A18 pinout, SMF30A-HM3_A18 application, or SMF30A-HM3_A18 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 capacitance (207 pF at 0 V), fast response, and AEC-Q101 qualification are critical.
Technical Context
The SMF30A-HM3_A18 operates as a unidirectional TVS diode with avalanche breakdown behavior, optimized for clamping transients on positive-polarity signal or supply lines. Its junction temperature range spans –65 °C to +175 °C, and thermal resistance (RthJA) is 180 K/W when mounted on a 3 mm × 3 mm Cu pad on epoxy-glass PCB.
It complies with IEC 61000-4-2 (±30 kV contact/air discharge) and AEC-Q101 (H3B-class ESD >8 kV HBM), and uses "Low Noise" technology enabling sub-nanosecond response time. The device supports wave and reflow soldering per J-STD-020 MSL level 1, with peak temperature up to 260 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 30 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 24 V nominal systems. |
| Breakdown Voltage (VBR) | 33.3–36.9 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering above VRWM with controlled tolerance. |
| Clamping Voltage (VC) | 48.4 V at 4.1 A (10/1000 μs) - Peak voltage seen by protected circuit during surge; enables safe margin for 3.3 V/5 V logic interfaces. |
| Peak Pulse Power (PPP) | 200 W at 10/1000 μs - Sustains standardized lightning/surge energy without failure; validated per IEC 61000-4-5. |
| Capacitance (CD) | 207 pF at 0 V, 1 MHz - Low enough for USB 2.0 (480 Mbps) and CAN FD signal integrity; measured under defined AC conditions. |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - Meets highest industrial and automotive ESD immunity requirements. |
| Package | DO-219AB (SOD-123W-compatible) - 3.9 mm × 1.9 mm × 1.08 mm low-profile outline; supports automated placement and high-density layouts. |
Pinout & Package
SMF30A-HM3_A18 is a two-terminal unidirectional TVS diode in the DO-219AB (SMF) package. Cathode is marked by a bar on the device body. The package is compatible with SOD-123W footprint and supports standard reflow profiles (peak ≤260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path | Connected to ground or low-impedance reference; completes clamping loop during overvoltage events. |
| Cathode | Protected line connection | Connected to signal/power line being safeguarded; conducts avalanche current when VRWM is exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 surges without derating in compact layouts. |
| ±30 kV ESD immunity (IEC 61000-4-2) | Eliminates need for secondary ESD stages in front-end interfaces of automotive and industrial equipment. |
| AEC-Q101 qualified | Validated for automotive under-hood and infotainment applications requiring extended temperature and reliability compliance. |
| 207 pF capacitance at 0 V | Preserves signal edge rate and eye diagram integrity on USB 2.0 and RS-485 buses up to 25 Mbps. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast transients, improving protection margin for downstream ICs. |
Applications
| Automotive Infotainment Display Interface | Industrial RS-485 Communication Port |
|---|---|
Use Scenario: Protecting LVDS or FPD-Link III video data lines between head unit and display panel against ESD and load dump coupling. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed at connector entry point, clamping fast transients before they reach serializer/deserializer ICs. Use Value: Maintains 207 pF capacitance to avoid skew between differential pairs while delivering ±30 kV ESD immunity required by ISO 10605. |
Use Scenario: Safeguarding RS-485 transceiver I/O pins in factory automation controllers exposed to cable-induced surges and field ESD. IC Role / Device Role / Timing Role: Line-side TVS diode connected anode-to-ground, cathode-to-A/B bus lines; clamps common-mode transients without loading DC bias. Use Value: 48.4 V clamping voltage ensures transceiver survival during 200 W surges, while DO-219AB footprint allows placement within 5 mm of connector. |
| USB 2.0 Host Port Protection | Smart Sensor Power Rail Clamp |
Use Scenario: ESD protection for D+ and D– lines on embedded USB host ports in medical diagnostic devices. IC Role / Device Role / Timing Role: Dual-channel discrete TVS (one per line) providing bidirectional-like coverage via unidirectional configuration with ground reference. Use Value: 207 pF capacitance meets USB 2.0 eye mask requirements; ±30 kV air discharge rating exceeds IEC 61000-4-2 Level 4. |
Use Scenario: Clamping 24 V supply rail transients in MEMS pressure sensors used in HVAC control systems. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VCC and GND, triggered only during overvoltage events to avoid leakage impact on quiescent current. Use Value: 30 V VRWM aligns with 24 V nominal rail; 175 °C max junction temperature supports operation in enclosed enclosures with ambient up to 105 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30A-E3/57T | DO-214AC (SMA) package; 30 V VRWM; 48.4 V VC; 200 W PPP; higher capacitance (350 pF) | Larger footprint (4.5 mm × 2.7 mm); less suitable for space-constrained USB or LVDS routing | Select when board layout allows larger package and higher capacitance is acceptable for lower-speed interfaces. |
| TPD2E001DRYR | 2-channel bidirectional TVS array in SOT-553; 5 V VRWM; 15 V VC; 0.8 pF per channel; not AEC-Q101 qualified | Designed for low-capacitance high-speed data (USB 2.0, HDMI); lacks automotive qualification and 30 V standoff capability | Choose only for non-automotive, low-voltage, ultra-high-speed signal lines where sub-1 pF capacitance is mandatory. |
Compared with SMAJ30A-E3/57T and TPD2E001DRYR, SMF30A-HM3_A18 uniquely balances 30 V standoff, 207 pF capacitance, AEC-Q101 qualification, and DO-219AB miniaturization-making it optimal for automotive and industrial 24 V interface protection where size, reliability, and speed coexist.
Availability
SMF30A-HM3_A18 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial RS-485 networks, and USB 2.0 host designs requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant ESD protection.
Supply support for SMF30A-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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SMF series targets high-speed, space-constrained ESD protection applications demanding AEC-Q101 qualification, low clamping voltage, and compatibility with modern SMT assembly processes.
FAQ
What is the maximum clamping voltage of SMF30A-HM3_A18 under standard surge conditions?
The SMF30A-HM3_A18 has a maximum clamping voltage (VC) of 48.4 V when subjected to a 4.1 A peak pulse current with a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 test conditions and ensures downstream ICs see limited overvoltage during transient events. The clamping performance is guaranteed across the full operating temperature range of –65 °C to +175 °C.
Is SMF30A-HM3_A18 qualified for automotive applications?
Yes, SMF30A-HM3_A18 is AEC-Q101 qualified and rated for human body model (HBM) ESD >8 kV (Class H3B). It meets stringent automotive reliability requirements including temperature cycling, humidity testing, and mechanical shock. The device is commonly deployed in infotainment displays, body control modules, and sensor interfaces where under-hood or cabin-grade robustness is mandated.
What package type does SMF30A-HM3_A18 use, and is it compatible with automated assembly?
SMF30A-HM3_A18 uses the DO-219AB (SMF) package - a low-profile, surface-mount outline measuring 3.9 mm × 1.9 mm × 1.08 mm. It is fully compatible with wave and reflow soldering per J-STD-020 MSL level 1, supporting peak temperatures up to 260 °C. The cathode bar marking and tape-and-reel packaging (A18 = 10K per 13″ reel) enable reliable pick-and-place integration.
How does the 207 pF capacitance of SMF30A-HM3_A18 affect high-speed signal integrity?
The 207 pF typical capacitance of SMF30A-HM3_A18 at 0 V and 1 MHz is optimized for interfaces up to 25 Mbps (e.g., RS-485, CAN FD) and USB 2.0 (480 Mbps) with careful layout. When placed within 5 mm of the connector and using symmetric routing, it introduces minimal signal degradation. For >1 Gbps links, lower-capacitance alternatives like TPD2E001DRYR would be preferred-but those lack 30 V standoff and AEC-Q101 rating.
What is the standoff voltage and why is it important for SMF30A-HM3_A18 selection?
The standoff voltage (VRWM) of SMF30A-HM3_A18 is 30 V - the maximum continuous reverse voltage it can withstand without significant leakage current (<0.1 μA). This parameter is critical for matching the protected circuit's operating voltage; selecting a VRWM too close to nominal rail voltage risks false triggering, while excessive margin reduces clamping efficiency. For 24 V systems, 30 V VRWM provides optimal safety margin and clamping responsiveness.
SMF30A-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):
- 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:
- -
- Capacitance @ Frequency:
- 207pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF30A-HM3_A18 FAQ
1.How can I place an order for SMF30A-HM3_A18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF30A-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 SMF30A-HM3_A18 reliable?
The price and inventory of SMF30A-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 SMF30A-HM3_A18 is usually 5 days.
3.What payment methods are accepted for SMF30A-HM3_A18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF30A-HM3_A18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF30A-HM3_A18?
SMF30A-HM3_A18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF30A-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 SMF30A-HM3_A18?
For technical support, including SMF30A-HM3_A18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF30A-HM3_A18 requirements.
6.How does Aetrix verify that SMF30A-HM3_A18 is sourced from the original manufacturer or authorized distributors?
All SMF30A-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 SMF30A-HM3_A18 meets industry standards.
7.What is the process for return or replacement of SMF30A-HM3_A18?
All SMF30A-HM3_A18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF30A-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 SMF30A-HM3_A18 part is unused and in its original packaging.
Return procedure for SMF30A-HM3_A18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF30A-HM3_A18 Tags
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