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Vishay General Semiconductor - Diodes Division SMF45A-M3-08
- Part No.:
- SMF45A-M3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF45A-M3-08.pdf
- Description:
- TVS DIODE 45VWM 72.7VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:9,303
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Product details
Overview
SMF45A-M3-08 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 stand-off voltage (VRWM), 50 V minimum reverse 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 162 pF typical junction capacitance at 0 V - optimized for USB 2.0, HDMI, and industrial sensor interfaces.
For engineers reviewing the SMF45A-M3-08 datasheet, SMF45A-M3-08 pinout, SMF45A-M3-08 application, or SMF45A-M3-08 equivalent, this device delivers verified low-clamping performance with AEC-Q101 qualification options, SOD-123W-compatible footprint, and MSL Level 1 reflow compatibility - critical for automotive infotainment and ruggedized industrial I/O protection.
Technical Context
The SMF45A-M3-08 operates as a single-channel unidirectional TVS diode, leveraging silicon avalanche technology to clamp transients above its 45 V stand-off threshold. Its 162 pF capacitance at 0 V and fast response time enable use on signal lines up to 100 Mbps without signal integrity degradation.
It meets IEC 61000-4-2 (±30 kV contact/air), IEC 61000-4-5 (1000 W, 8/20 μs), and AEC-Q101 Class H3B (>8 kV HBM) requirements. Thermal resistance is 180 K/W when mounted on 3 mm × 3 mm Cu pads, supporting sustained operation from −65 °C to +175 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 45 V - maximum continuous reverse operating voltage before clamping begins; ensures no leakage during normal 3.3 V/5 V/12 V interface operation. |
| Reverse Breakdown (VBR) | 50–55.3 V at 1 mA - sharp avalanche onset guarantees predictable turn-on during ESD events. |
| Clamping Voltage (VC) | 72.7 V at 2.8 A (10/1000 μs) - limits downstream IC stress to safe levels under surge conditions. |
| Junction Capacitance (CD) | 162 pF at 0 V, 1 MHz - low enough for USB 2.0 (480 Mbps) and CAN FD signal integrity preservation. |
| ESD Rating | ±30 kV contact & air discharge per IEC 61000-4-2 - exceeds automotive and industrial immunity requirements. |
| Peak Pulse Power | 200 W (10/1000 μs); 1000 W (8/20 μs) - handles both ESD and lightning-induced surges in compact layout. |
| Operating Temperature | −65 °C to +175 °C - supports under-hood automotive, motor control, and outdoor industrial deployment. |
Pinout & Package
SMF45A-M3-08 uses the DO-219AB (SMF) package: low-profile (1.08 mm max height), SOD-123W-compatible outline, cathode-marked with bar, and rated MSL Level 1 for unlimited floor life and 260 °C peak reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/line side terminal | Connected to protected signal line; conducts surge current toward ground during overvoltage. |
| Cathode | Ground-reference terminal | Connected to system ground plane; establishes clamping reference and enables unidirectional protection path. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables robust protection against repetitive ESD and surge events without thermal runaway in space-constrained PCBs. |
| ±30 kV ESD immunity (IEC 61000-4-2) | Meets highest industrial and automotive ESD test requirements without external shielding or layout reinforcement. |
| 162 pF junction capacitance | Preserves signal edge rate and eye diagram integrity on 480 Mbps USB 2.0 and 100 Mbps Ethernet PHY lines. |
| AEC-Q101 qualified variants available | Supports automotive-grade qualification paths for infotainment, ADAS camera links, and body electronics. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, reducing risk of latch-up or gate oxide damage in downstream ICs. |
Applications
| USB 2.0 Interface Protection | HDMI DDC Channel Protection |
|---|---|
Use Scenario: Protecting USB 2.0 data lines (D+/D−) in portable medical devices against hospital-grade ESD events. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed directly at connector, clamping transients before they reach USB transceiver IC. Use Value: 162 pF capacitance avoids signal rise-time degradation; 72.7 V clamping prevents damage to 3.3 V PHY I/O structures. |
Use Scenario: Safeguarding HDMI DDC (I²C) lines in digital signage controllers exposed to handling ESD during field maintenance. IC Role / Device Role / Timing Role: Standoff-rated TVS on 5 V DDC bus, absorbing contact discharges while maintaining <1 μA leakage at 5 V. Use Value: 45 V VRWM ensures zero interference with 5 V logic levels; ±30 kV rating exceeds IEC 61000-4-2 requirement for commercial installations. |
| Automotive Sensor Signal Lines | Industrial RS-485 Transceiver Ports |
Use Scenario: Protecting analog sensor outputs (e.g., pressure, temperature) in engine control units subject to ISO 10605 pulses. IC Role / Device Role / Timing Role: Low-leakage (0.1 μA at 45 V) unidirectional clamp on 12 V sensor supply or signal return path. Use Value: 175 °C max junction temperature supports under-hood placement; 50 V VBR ensures reliable triggering before sensor IC damage thresholds. |
Use Scenario: Shielding RS-485 transceiver I/O pins in factory automation PLC modules from cable discharge events. IC Role / Device Role / Timing Role: Primary-level TVS on differential A/B lines, limiting common-mode surges to <73 V during 1 kV/500 A surge tests. Use Value: 200 W (10/1000 μs) rating sustains repeated 400 V surges; DO-219AB package allows automated placement alongside 0805 transceivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45A-E3/57T | Higher clamping voltage (84.5 V at 3.5 A), larger SMA (DO-214AC) package (4.5 mm × 2.7 mm), 200 pF capacitance. | Better suited for higher-energy 10/1000 μs surges but less ideal for high-speed data due to higher capacitance and size. | Select SMAJ45A-E3/57T only if board space permits larger footprint and signal bandwidth is ≤10 Mbps. |
| TPD2E001DRYR | 2-channel bidirectional array, 15 pF capacitance, 5 V VRWM, integrated ESD protection for USB D+/D−, not rated for 45 V standoff. | Designed exclusively for 5 V USB 2.0; cannot replace SMF45A-M3-08 in 12–48 V industrial or automotive signal lines. | Choose TPD2E001DRYR only for dedicated 5 V USB port protection where ultra-low capacitance is mandatory. |
Compared with SMAJ45A-E3/57T and TPD2E001DRYR, SMF45A-M3-08 uniquely balances 45 V standoff, 162 pF capacitance, and DO-219AB compactness - making it optimal for 12–48 V industrial data links and automotive sensor interfaces where both voltage range and signal fidelity matter.
Availability
SMF45A-M3-08 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, automotive sensor signal conditioning, and industrial RS-485 port hardening requiring stable component supply across production lifecycles.
Supply support for SMF45A-M3-08 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, high-voltage ESD protection in space-constrained applications - engineered for AEC-Q101 readiness, low capacitance, and repeatable clamping performance across extreme temperatures.
FAQ
What is the maximum clamping voltage of the SMF45A-M3-08 under standard IEC 61000-4-2 ESD conditions?
The SMF45A-M3-08 does not specify clamping voltage under IEC 61000-4-2 test conditions; instead, its 72.7 V maximum clamping voltage is defined at 2.8 A peak pulse current using the 10/1000 μs waveform. This value reflects worst-case clamping during surge events relevant to system-level immunity testing, and SMF45A-M3-08 maintains consistent performance across its full operating temperature range.
Is the SMF45A-M3-08 RoHS-compliant and lead-free?
Yes, SMF45A-M3-08 is RoHS-compliant and features lead (Pb)-free terminations with tin plating, as confirmed by Vishay's environmental coding and compliance documentation. The "M3" suffix denotes lead-free, RoHS-compliant packaging per JEDEC standards, and the device meets JESD201 whisker testing Class 2 requirements.
Can SMF45A-M3-08 be used in bidirectional signal protection applications?
No, SMF45A-M3-08 is a unidirectional TVS diode intended for DC-biased or ground-referenced lines. Its electrical characteristics - including 45 V stand-off and cathode-anode polarity - assume a fixed voltage bias direction. For bidirectional protection (e.g., AC-coupled lines), a dual-diode configuration or a dedicated bidirectional part like SMBJ45CA would be required instead of SMF45A-M3-08.
What is the moisture sensitivity level (MSL) rating for SMF45A-M3-08?
SMF45A-M3-08 carries an MSL Level 1 rating per J-STD-020, meaning it has unlimited floor life and may be stored indefinitely at ≤30 °C/60% RH without dry-pack requirements. This simplifies manufacturing logistics and supports standard reflow profiles with peak temperature up to 260 °C - a key advantage over MSL Level 3+ components requiring baking prior to assembly.
Does SMF45A-M3-08 meet AEC-Q101 qualification?
The base SMF45A-M3-08 is not AEC-Q101 qualified; however, Vishay offers AEC-Q101-qualified versions within the SMF45A family under different ordering codes (e.g., SMF45A-HE3_A08). These variants undergo additional stress testing for automotive use, while SMF45A-M3-08 remains suitable for industrial and commercial applications meeting IEC 61000-4-2 and IEC 61000-4-5 requirements.
SMF45A-M3-08 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):
- 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:
- General Purpose
- Capacitance @ Frequency:
- 162pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF45A-M3-08 FAQ
1.How can I place an order for SMF45A-M3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF45A-M3-08 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-M3-08 reliable?
The price and inventory of SMF45A-M3-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF45A-M3-08 is usually 5 days.
3.What payment methods are accepted for SMF45A-M3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF45A-M3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF45A-M3-08?
SMF45A-M3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF45A-M3-08 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-M3-08?
For technical support, including SMF45A-M3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF45A-M3-08 requirements.
6.How does Aetrix verify that SMF45A-M3-08 is sourced from the original manufacturer or authorized distributors?
All SMF45A-M3-08 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-M3-08 meets industry standards.
7.What is the process for return or replacement of SMF45A-M3-08?
All SMF45A-M3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF45A-M3-08, 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-M3-08 part is unused and in its original packaging.
Return procedure for SMF45A-M3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF45A-M3-08 Tags
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