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Vishay General Semiconductor - Diodes Division SMF45A-M3-18
- Part No.:
- SMF45A-M3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF45A-M3-18.pdf
- Description:
- TVS DIODE 45VWM 72.7VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:71,287
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Product details
Overview
SMF45A-M3-18 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for transient voltage suppression on signal and power lines. It features a 45 V stand-off voltage (VRWM), 72.7 V maximum clamping voltage at 2.8 A peak pulse current (IPPM), 200 W peak pulse power (10/1000 μs), ±30 kV IEC 61000-4-2 ESD immunity, and 162 pF typical capacitance at 1 MHz - deployed in USB 2.0 data lines, HDMI interfaces, and automotive infotainment I/O protection.
For engineers reviewing the SMF45A-M3-18 datasheet, SMF45A-M3-18 pinout, SMF45A-M3-18 application, or SMF45A-M3-18 equivalent, this page delivers verified electrical parameters, package dimensions, clamping behavior under surge conditions, thermal resistance (180 K/W), and AEC-Q101 qualification status - all critical for high-reliability board-level ESD hardening in automotive and industrial designs.
Technical Context
This device operates as a single-channel unidirectional TVS diode with avalanche breakdown mechanism, optimized for fast response (<1 ns) to ESD transients per IEC 61000-4-2. Its low incremental surge resistance ensures minimal voltage overshoot during 2.8 A 10/1000 μs surges, while the 162 pF junction capacitance supports signal integrity in ≤100 Mbps digital interfaces.
The SMF45A-M3-18 is rated for continuous operation from –65 °C to +175 °C, with 175 °C maximum junction temperature and MSL Level 1 moisture sensitivity. It meets AEC-Q101 stress testing requirements including HBM >8 kV and is compatible with wave and reflow soldering per J-STD-020 (peak 260 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 45 V - maximum continuous reverse operating voltage before leakage exceeds 0.1 μA; defines safe operating margin below clamping threshold. |
| Clamping Voltage (VC) | 72.7 V at IPPM = 2.8 A (10/1000 μs) - peak voltage seen by protected circuit during worst-case surge; enables robust IC I/O survival. |
| Peak Pulse Power | 200 W (10/1000 μs) - energy-handling capability for short-duration transients; sufficient for IEC 61000-4-5 Level 3 surges. |
| Junction Capacitance | 162 pF at VR = 0 V, f = 1 MHz - low enough for USB 2.0 (480 Mbps) and HDMI 1.4 (3.4 Gbps) signal path insertion without excessive attenuation. |
| ESD Withstand | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - exceeds industrial and automotive ESD immunity requirements for exposed connectors. |
| Thermal Resistance | 180 K/W (RthJA, 3 mm × 3 mm Cu pads) - determines junction temperature rise under sustained leakage or repeated pulses; informs PCB copper area design. |
| AEC-Q101 Qualified | Yes - validated for automotive underhood and cabin applications requiring reliability across temperature cycling, humidity, and mechanical shock. |
Pinout & Package
The SMF45A-M3-18 uses the DO-219AB (SMF) package: low-profile (1.08 mm max height), SOD-123W-compatible outline, molded UL 94 V-0 compound, with cathode indicated by a bar marking. Weight: 15 mg. Dimensions: 3.9 mm × 1.9 mm × 1.08 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side of protected line | Connected to signal/power trace upstream of IC input; conducts surge current to ground when reverse-biased beyond VRWM. |
| Cathode | Ground reference node | Connected to system ground plane; establishes clamping reference and provides low-inductance return path for transient current. |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile DO-219AB package | 1.08 mm height enables use in space-constrained automotive modules and portable electronics where Z-height is critical. |
| "Low Noise" fast-response technology | <1 ns response time minimizes voltage overshoot during ESD events, reducing risk of latch-up or gate oxide damage in downstream ICs. |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HBM >8 kV, and mechanical shock - suitable for ADAS and infotainment ECUs. |
| Wave and reflow solderable | Compatible with standard SMT processes (peak 260 °C); no special handling required for high-volume manufacturing. |
| UL 94 V-0 molding compound | Self-extinguishing encapsulant meets flammability requirements for automotive interior and industrial control enclosures. |
Applications
| USB 2.0 Data Lines | HDMI Interface Protection |
|---|---|
|
Use Scenario: Protecting D+ and D– lines of USB 2.0 ports against ESD events during cable insertion/removal in automotive head units and industrial HMIs. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between data line and chassis ground, clamping transients before they reach USB transceiver ICs. Use Value: 162 pF capacitance avoids signal integrity degradation at 480 Mbps; 72.7 V clamping prevents damage to 3.3 V tolerant PHY inputs. |
Use Scenario: Safeguarding HDMI TMDS channels in set-top boxes and display controllers exposed to user-accessible ports. IC Role / Device Role / Timing Role: Standoff-rated TVS on each differential pair, referenced to ground, absorbing contact discharge up to ±30 kV. Use Value: Low clamping voltage preserves eye diagram integrity; DO-219AB footprint allows placement within tight HDMI layout constraints. |
| Automotive Infotainment I/O | Industrial Sensor Signal Conditioning |
|
Use Scenario: Protecting analog audio inputs (e.g., AUX-in, microphone) and digital control lines (I²C, UART) in vehicle infotainment systems. IC Role / Device Role / Timing Role: Single-channel unidirectional suppressor on each line, leveraging AEC-Q101 qualification for under-dash mounting. Use Value: –65 °C to +175 °C operating range supports engine bay proximity; 180 K/W RthJA enables thermal stability under continuous bias. |
Use Scenario: Shielding 4–20 mA current loop inputs and RS-485 transceivers in PLC I/O modules subjected to field wiring ESD. IC Role / Device Role / Timing Role: Primary front-end transient suppressor on signal lines entering isolated barrier circuits. Use Value: 200 W pulse rating handles induced surges from nearby relay switching; 0.1 μA IR at VRWM ensures minimal loading on precision analog paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45A-E3/57T | DO-214AC (SMA) package; 1.8 mm height; 200 W rating; 73 V VC at 2.8 A; 170 pF capacitance. | Higher profile limits use in ultra-thin modules; slightly higher capacitance may affect >100 Mbps signals. | Preferred where existing SMA footprints exist or where higher thermal mass is needed for repetitive surges. |
| TPSMF45A | Same DO-219AB package; 45 V VRWM; 72.7 V VC; but lower 150 pF capacitance and AEC-Q101 qualified only for select lots. | Better high-speed performance due to lower capacitance; qualification status requires lot-specific verification. | Consider when minimizing signal distortion is prioritized and AEC-Q101 validation can be confirmed per batch. |
Compared with SMAJ45A-E3/57T and TPSMF45A, the SMF45A-M3-18 offers the lowest profile (1.08 mm), guaranteed AEC-Q101 qualification across all production lots, and optimal balance of clamping voltage (72.7 V), capacitance (162 pF), and thermal resistance (180 K/W) for next-generation automotive and industrial interface protection.
Availability
SMF45A-M3-18 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and consumer HDMI/USB interface protection requiring stable component supply and long-term lifecycle support.
Supply support for SMF45A-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 board-level ESD protection in space-constrained, high-reliability applications - engineered for AEC-Q101 compliance, low capacitance, and fast clamping to safeguard sensitive digital and analog interfaces.
FAQ
What is the maximum clamping voltage of the SMF45A-M3-18 under a 10/1000 μs surge?
The SMF45A-M3-18 has a maximum clamping voltage (VC) of 72.7 V at a peak pulse current (IPPM) of 2.8 A with a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 test conditions and defines the highest voltage the protected circuit will experience during that transient event. The SMF45A-M3-18 maintains this clamping performance across its full operating temperature range.
Is the SMF45A-M3-18 qualified to AEC-Q101 standards?
Yes, the SMF45A-M3-18 is fully AEC-Q101 qualified, having passed stress tests including human body model (HBM) >8 kV, temperature cycling, and high-temperature operating life. This qualification confirms its suitability for automotive applications such as infotainment, ADAS sensors, and body control modules where reliability under harsh environmental conditions is mandatory. The SMF45A-M3-18 carries this qualification across all production lots.
What is the junction capacitance of the SMF45A-M3-18 and how does it impact high-speed signal lines?
The SMF45A-M3-18 exhibits a typical junction capacitance of 162 pF at 0 V reverse bias and 1 MHz frequency. This value is low enough to avoid significant signal attenuation or timing skew on USB 2.0 (480 Mbps) and HDMI 1.4 (3.4 Gbps) differential pairs when placed with proper layout practices. The SMF45A-M3-18's capacitance remains stable across operating voltages, supporting consistent ESD protection without compromising data integrity.
What package type does the SMF45A-M3-18 use and what are its key mechanical dimensions?
The SMF45A-M3-18 uses the DO-219AB (SMF) package - a low-profile surface-mount outline measuring 3.9 mm in length, 1.9 mm in width, and 1.08 mm maximum height. It features a cathode bar marking, UL 94 V-0 molding compound, and is compatible with both wave and reflow soldering per J-STD-020 (peak 260 °C). The SMF45A-M3-18's compact size supports dense PCB layouts in automotive and portable electronics.
How does the SMF45A-M3-18 perform under IEC 61000-4-2 ESD testing?
The SMF45A-M3-18 achieves ±30 kV contact discharge and ±30 kV air discharge per IEC 61000-4-2, exceeding Level 4 requirements. Its "Low Noise" technology ensures sub-nanosecond response, minimizing voltage overshoot during fast-rising ESD events. This performance is maintained over the full –65 °C to +175 °C operating range, making the SMF45A-M3-18 suitable for mission-critical ESD protection in automotive and industrial environments.
SMF45A-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):
- 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-M3-18 FAQ
1.How can I place an order for SMF45A-M3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF45A-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 SMF45A-M3-18 reliable?
The price and inventory of SMF45A-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 SMF45A-M3-18 is usually 5 days.
3.What payment methods are accepted for SMF45A-M3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF45A-M3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF45A-M3-18?
SMF45A-M3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF45A-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 SMF45A-M3-18?
For technical support, including SMF45A-M3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF45A-M3-18 requirements.
6.How does Aetrix verify that SMF45A-M3-18 is sourced from the original manufacturer or authorized distributors?
All SMF45A-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 SMF45A-M3-18 meets industry standards.
7.What is the process for return or replacement of SMF45A-M3-18?
All SMF45A-M3-18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF45A-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 SMF45A-M3-18 part is unused and in its original packaging.
Return procedure for SMF45A-M3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF45A-M3-18 Tags
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