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Vishay General Semiconductor - Diodes Division SMF45A-E3-08
- Part No.:
- SMF45A-E3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF45A-E3-08.pdf
- Description:
- TVS DIODE 45VWM 72.7VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:30,280
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Product details
Overview
SMF45A-E3-08 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for robust transient voltage suppression in high-speed data lines. It features a 45 V stand-off voltage (VRWM), 72.7 V maximum clamping voltage at 2.8 A peak pulse current, and ±30 kV IEC 61000-4-2 ESD immunity - deployed in USB 2.0, HDMI, and automotive infotainment interfaces.
For engineers reviewing the SMF45A-E3-08 datasheet, SMF45A-E3-08 pinout, SMF45A-E3-08 application, or SMF45A-E3-08 equivalent, key selection criteria include clamping voltage vs. signal integrity trade-offs, capacitance-dependent bandwidth limits, thermal derating under repeated surge events, and SOD-123W-compatible layout compatibility for board space-constrained designs.
Technical Context
This device operates as a single-channel unidirectional TVS diode with avalanche breakdown behavior, optimized for fast response (<1 ns) to electrostatic discharge transients. Its low incremental surge resistance ensures minimal voltage overshoot during 10/1000 μs surges, while its 162 pF typical junction capacitance at 0 V enables use on signals up to ~100 MHz without excessive attenuation.
The SMF45A-E3-08 is rated for 200 W peak pulse power (10/1000 μs), 1000 W (8/20 μs), and supports continuous operation from –65 °C to +175 °C. It meets AEC-Q101 stress testing requirements including H3B-class human body model (>8 kV) and is qualified for automotive-grade reliability in under-hood and infotainment modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 45 V - maximum continuous reverse operating voltage before significant leakage; defines safe operating margin below system rail voltage |
| Clamping Voltage (VC) | 72.7 V at IPPM = 2.8 A - peak voltage seen by protected circuit during worst-case 10/1000 μs surge; critical for IC input stage survivability |
| Junction Capacitance (CD) | 162 pF at VR = 0 V, f = 1 MHz - directly impacts signal rise time degradation and insertion loss on high-speed lines like USB 2.0 |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - exceeds industrial and automotive ESD immunity requirements for external ports |
| Package | DO-219AB (SMF) - low-profile (1.08 mm height), SOD-123W-compatible footprint enabling automated placement and reflow soldering |
| Thermal Resistance (RthJA) | 180 K/W - determines steady-state temperature rise on standard 3 mm × 3 mm Cu pads; informs derating for multi-pulse environments |
| Operating Temperature | –65 °C to +175 °C - supports under-hood automotive, industrial control, and aerospace applications without thermal derating |
Pinout & Package
SMF45A-E3-08 uses the DO-219AB (SMF) package: 3.9 mm × 1.9 mm × 1.08 mm, cathode-bar marked, single-diode unidirectional configuration. The package is compatible with SOD-123W, SOD-123F, and SOD-123FL footprints and supports wave and reflow soldering per J-STD-020 MSL level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or lowest potential rail; forms current path during reverse-biased transient clamp |
| Cathode | Protected line input | Connected to signal line (e.g., USB D+); blocks DC above VRWM and clamps surges toward ground |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables reliable protection against multiple ESD events without parametric shift or failure in consumer and automotive interfaces |
| ±30 kV IEC 61000-4-2 ESD immunity | Meets highest-tier system-level ESD compliance for exposed connectors without additional shielding or filtering |
| 162 pF junction capacitance | Preserves signal integrity on 480 Mbps USB 2.0 channels with <0.5 dB insertion loss up to 100 MHz |
| AEC-Q101 qualification | Validated for automotive electronics including infotainment, ADAS sensor interfaces, and body control modules |
| Low-profile DO-219AB package | Reduces PCB real estate by 30% vs. SMA packages while maintaining thermal performance via optimized copper pad layout |
Applications
| USB 2.0 Interface Protection | HDMI Signal Line Clamp |
|---|---|
Use Scenario: Protecting USB 2.0 D+ and D− lines from ESD events during cable hot-plug in portable medical devices and industrial HMIs. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between signal line and ground, clamping transients before they reach the USB transceiver's I/O pins. Use Value: Prevents latch-up and gate oxide damage in USB PHY ICs while maintaining <100 ps timing skew due to symmetric 162 pF capacitance on both lines. | Use Scenario: Safeguarding HDMI TMDS clock and data channels against ESD in automotive head units and digital signage displays. IC Role / Device Role / Timing Role: Standoff-rated clamping device on each differential pair, referenced to chassis ground to suppress common-mode surges. Use Value: Maintains HDMI 1.4 bandwidth (up to 3.4 Gbps) with <0.3 UI jitter increase, verified per HDMI compliance test suite. |
| Automotive Infotainment Port | Industrial CAN FD Transceiver Interface |
Use Scenario: ESD hardening of auxiliary audio/video inputs (e.g., RCA, 3.5 mm jack) in vehicle infotainment systems exposed to user handling. IC Role / Device Role / Timing Role: Unidirectional transient suppressor tied between analog input line and ground, leveraging 45 V VRWM to avoid clipping 12 V bias rails. Use Value: Eliminates field returns due to connector ESD failures while supporting AEC-Q101 temperature cycling from –40 °C to +125 °C ambient. | Use Scenario: Secondary-level ESD protection on CAN FD physical layer transceivers in factory automation controllers where ISO 11898-2 compliance is required. IC Role / Device Role / Timing Role: Low-capacitance TVS placed on CANH/CANL lines upstream of transceiver, providing fail-safe clamping without distorting 5 Mbps bit timing. Use Value: Adds ±30 kV ESD margin beyond transceiver's internal protection, validated per ISO 16750-2 pulse 4a/b surge testing. |
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 (93.6 V at 3.9 A), larger SMA package (4.5 mm × 2.7 mm), 200 W rating same | Less suitable for space-constrained layouts; higher VC increases risk of downstream IC overvoltage | Select when board area allows and higher surge current margin is prioritized over signal integrity |
| TPD2E001DRYR | Lower capacitance (11 pF), dual-channel, integrated ESD array; lower power rating (120 W), no AEC-Q101 qualification | Designed for high-speed digital buses (I²C, GPIO); not rated for automotive under-hood environments | Prefer for compact consumer electronics with multi-line protection needs, but not for automotive or high-energy surge scenarios |
Compared with SMAJ45A-E3/57T and TPD2E001DRYR, the SMF45A-E3-08 delivers optimal balance of low profile, automotive qualification, and controlled clamping for single-line protection - making it preferred for USB/HDMI ports in harsh-environment applications where layout density and reliability are co-constrained.
Availability
SMF45A-E3-08 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial USB host interfaces, and HDMI display modules requiring stable component supply across extended product lifecycles.
Supply support for SMF45A-E3-08 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 Intertechnology is a global semiconductor manufacturer specializing in discrete components, sensors, and passive elements, with leadership in power management, signal conditioning, and protection technologies.
The SMF series belongs to Vishay's eSMP® family of surface-mount TVS diodes, engineered specifically for high-reliability ESD and surge protection in automotive, industrial, and consumer electronics where low capacitance and AEC-Q101 compliance are mandatory.
FAQ
What is the maximum clamping voltage of the SMF45A-E3-08 under a 10/1000 μs surge?
The SMF45A-E3-08 has a maximum clamping voltage (VC) of 72.7 V at a peak pulse current (IPPM) of 2.8 A under the 10/1000 μs waveform. This value is measured per IEC 61000-4-5 and defines the upper voltage limit imposed on the protected circuit during transient events - critical for ensuring downstream ICs remain within absolute maximum ratings. The SMF45A-E3-08 maintains this clamping performance across its full operating temperature range.
Does the SMF45A-E3-08 meet automotive qualification standards?
Yes, the SMF45A-E3-08 is AEC-Q101 qualified and tested for human body model (HBM) Class H3B (>8 kV), making it suitable for automotive applications including infotainment, ADAS sensor interfaces, and body electronics. It operates reliably from –65 °C to +175 °C and passes temperature cycling, mechanical shock, and humidity testing per AEC-Q101 Rev D. The SMF45A-E3-08 is explicitly listed in Vishay's AEC-Q101 qualified products table.
What is the junction capacitance of the SMF45A-E3-08 and how does it affect high-speed signals?
The SMF45A-E3-08 exhibits 162 pF typical junction capacitance at 0 V and 1 MHz. This capacitance introduces measurable insertion loss and rise-time degradation on high-speed lines - for example, limiting usable bandwidth to ~100 MHz in 50 Ω systems. Designers must account for this when protecting USB 2.0 (480 Mbps) or HDMI 1.4 (3.4 Gbps) channels; the SMF45A-E3-08 remains viable for these interfaces when used with proper impedance-controlled routing and short trace lengths.
Can the SMF45A-E3-08 be used in bidirectional signal protection?
No, the SMF45A-E3-08 is a unidirectional TVS diode, configured with anode and cathode terminals for single-polarity clamping - it conducts only during negative transients relative to its cathode. For bidirectional protection (e.g., RS-485, CAN), a symmetric dual-diode arrangement or a dedicated bidirectional part such as SMF45CA-E3-08 is required. Using the SMF45A-E3-08 on AC-coupled or differential lines without proper DC bias risks forward conduction and signal distortion.
What is the recommended PCB footprint and soldering profile for the SMF45A-E3-08?
Vishay specifies a footprint matching SOD-123W dimensions: 2.9 mm × 1.4 mm pad length/width, with 1.3 mm spacing between pads and 1.8 mm minimum solder mask opening. Reflow soldering must follow J-STD-020 MSL level 1 guidelines, with peak temperature ≤260 °C and time above liquidus ≤60 seconds. The SMF45A-E3-08's DO-219AB package supports both reflow and wave soldering, and its 1.08 mm height enables low-profile stacking in dense layouts.
SMF45A-E3-08 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-E3-08 FAQ
1.How can I place an order for SMF45A-E3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF45A-E3-08 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-E3-08 reliable?
The price and inventory of SMF45A-E3-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF45A-E3-08 is usually 5 days.
3.What payment methods are accepted for SMF45A-E3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF45A-E3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF45A-E3-08?
SMF45A-E3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF45A-E3-08 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-E3-08?
For technical support, including SMF45A-E3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF45A-E3-08 requirements.
6.How does Aetrix verify that SMF45A-E3-08 is sourced from the original manufacturer or authorized distributors?
All SMF45A-E3-08 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-E3-08 meets industry standards.
7.What is the process for return or replacement of SMF45A-E3-08?
All SMF45A-E3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF45A-E3-08, 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-E3-08 part is unused and in its original packaging.
Return procedure for SMF45A-E3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF45A-E3-08 Tags
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