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Vishay SMF45A-HE3_A08
- Part No.:
- SMF45A-HE3_A08
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF45A-HE3_A08.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,019
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Product details
Overview
SMF45A-HE3_A08 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 45 V stand-off voltage (VRWM), 72.7 V maximum clamping voltage at 2.8 A peak pulse current, ±30 kV IEC 61000-4-2 ESD immunity, and 200 W peak pulse power (10/1000 μs). It is AEC-Q101 qualified and used in automotive infotainment interfaces.
For engineers reviewing the SMF45A-HE3_A08 datasheet, SMF45A-HE3_A08 pinout, SMF45A-HE3_A08 application, or SMF45A-HE3_A08 equivalent, this page delivers verified electrical parameters, package dimensions, clamping behavior under surge conditions, thermal resistance (180 K/W), and real-world ESD protection performance for automotive-grade signal line hardening.
Technical Context
This device operates as a single-channel unidirectional TVS diode with avalanche breakdown mechanism. Its low incremental surge resistance enables fast clamping response (<1 ns), and its "Low Noise" technology minimizes parasitic capacitance (162 pF at 0 V, 1 MHz) to preserve signal integrity on USB 2.0 and CAN FD lines.
The SMF45A-HE3_A08 is rated for continuous operation from -65 °C to +175 °C, supports wave and reflow soldering per J-STD-020 MSL level 1, and meets AEC-Q101 stress test requirements including HBM >8 kV - making it suitable for under-hood and dashboard electronics where thermal cycling and ESD robustness are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 45 V - Maximum continuous reverse 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; ensures downstream ICs remain within absolute max ratings. |
| Peak Pulse Power (PPP) | 200 W (10/1000 µs) - Sustains transient energy without failure; sufficient for IEC 61000-4-5 Level 3 surges in 12 V automotive systems. |
| Capacitance (CD) | 162 pF at 0 V, 1 MHz - Low enough to avoid signal degradation on 480 Mbps USB 2.0 differential pairs; measured per standard test conditions. |
| ESD Immunity | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - Exceeds industrial and automotive ESD test requirements; validated across 10 pulses per polarity. |
| Junction Temperature Range | -65 °C to +175 °C - Enables deployment in engine control units, ADAS sensors, and other high-ambient-temperature environments. |
| Thermal Resistance (RthJA) | 180 K/W - Measured on 3 mm × 3 mm Cu pads (≥40 µm); informs PCB copper area requirements for thermal management in compact layouts. |
Pinout & Package
SMF45A-HE3_A08 uses the DO-219AB (SOD-123W-compatible) surface-mount package: 3.9 mm × 1.9 mm × 1.08 mm, low-profile, cathode-bar marked, MSL level 1, RoHS-compliant, lead-free tin-plated terminations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side connection | Connected to signal or power line requiring protection; conducts during forward-biased transients (e.g., negative-going ESD on ground-referenced lines). |
| Cathode | Output/Protected-side connection | Connected to IC input or power rail; provides low-impedance path to ground during reverse-biased overvoltage events (e.g., positive ESD on data lines). |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 µs) | Enables robust protection against repetitive surges in automotive power domains without thermal runaway. |
| ±30 kV IEC 61000-4-2 ESD rating | Eliminates need for secondary ESD filtering stages in USB, HDMI, and LIN bus interfaces. |
| AEC-Q101 qualification | Validates reliability for automotive applications including temperature cycling, mechanical shock, and humidity testing. |
| 162 pF capacitance at 0 V | Maintains signal rise/fall time integrity on 480 Mbps USB 2.0 and 1 Mbps CAN FD buses. |
| Low-profile DO-219AB package | Reduces board space vs. SMA/SMB packages while enabling automated optical inspection (AOI) compatibility. |
Applications
| Automotive Infotainment Display Interface | USB 2.0 Data Line Protection |
|---|---|
Use Scenario: Protecting LVDS or FPD-Link video data lines between head unit and TFT display in vehicles exposed to door-close ESD. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed inline on each differential pair, referenced to chassis ground. Use Value: Clamps transients to ≤72.7 V within <1 ns, preventing latch-up in display serializer ICs while adding only 162 pF loading per line. |
Use Scenario: Safeguarding D+ and D- pins of USB 2.0 host controllers in telematics control units subjected to hot-plug ESD. IC Role / Device Role / Timing Role: Bidirectional protection achieved via two SMF45A-HE3_A08 devices (anode-to-anode configuration) per differential pair. Use Value: Maintains 480 Mbps data integrity with sub-100 ps jitter impact and withstands ≥1000 insertion cycles per IEC 61000-4-2 test plan. |
| 12 V Power Rail Surge Suppression | CAN FD Bus Node Protection |
Use Scenario: Suppressing load-dump and jump-start induced transients on 12 V supply inputs to body control modules. IC Role / Device Role / Timing Role: Parallel-connected unidirectional TVS on main power rail, downstream of fuse and upstream of DC/DC converter. Use Value: Absorbs 200 W (10/1000 µs) surges without degradation, limiting rail voltage to 72.7 V and protecting 75 V-rated input capacitors. |
Use Scenario: Protecting CAN FD transceivers in ADAS domain controllers from ESD events during sensor calibration or service port access. IC Role / Device Role / Timing Role: Single SMF45A-HE3_A08 per CANH/CANL line, cathode tied to VCC, anode to line - configured for common-mode clamp. Use Value: Provides ±30 kV contact discharge immunity while adding <0.5% propagation delay skew to 5 Mbps CAN FD signals. |
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 | Higher clamping voltage (84.5 V at 3.5 A), larger SMA package (4.5 mm × 2.7 mm), 200 W rating same. | Less suitable for space-constrained automotive modules; better for industrial power supplies with higher thermal mass. | Select when board layout allows larger footprint and higher clamping voltage is acceptable for downstream 85 V-rated components. |
| TPD2E001DRYR | 2-channel, 15 pF per line, 12 V VRWM, not AEC-Q101 qualified, 500 W (8/20 µs) but only 20 W (10/1000 µs). | Designed for high-speed digital interfaces (USB, HDMI) where ultra-low capacitance is prioritized over automotive qualification. | Select for consumer electronics USB ports where size and capacitance dominate; avoid for automotive due to missing AEC-Q101 and lower surge rating. |
Compared with SMAJ45A-E3/57T and TPD2E001DRYR, SMF45A-HE3_A08 uniquely balances AEC-Q101 qualification, 162 pF capacitance, 72.7 V clamping, and DO-219AB footprint - making it optimal for automotive signal-line protection where space, reliability, and ESD margin are jointly constrained.
Availability
SMF45A-HE3_A08 is available at Aetrix Electronics and suitable for automotive infotainment systems, USB 2.0 interface protection, and 12 V power rail surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMF45A-HE3_A08 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 automotive-grade ESD protection with AEC-Q101 qualification, low capacitance, and robust surge handling - engineered specifically for next-generation vehicle networks and high-speed serial interfaces.
FAQ
What is the maximum clamping voltage of SMF45A-HE3_A08 under standard surge conditions?
The SMF45A-HE3_A08 has a maximum clamping voltage (VC) of 72.7 V when subjected to a 2.8 A peak pulse current with a 10/1000 µs waveform. This value is measured per IEC 61000-4-5 test conditions and ensures protected circuits remain within safe voltage limits during transient events. The clamping performance is guaranteed across the full operating temperature range of -65 °C to +175 °C.
Is SMF45A-HE3_A08 qualified for automotive applications?
Yes, SMF45A-HE3_A08 is AEC-Q101 qualified, having passed stress tests including human body model ESD (>8 kV), temperature cycling, and high-temperature reverse bias. It is rated for continuous operation from -65 °C to +175 °C and is widely deployed in automotive infotainment, body control, and ADAS modules. The part number suffix "HE3_A08" denotes AEC-Q101 qualification and RoHS-compliant, lead-free termination.
What package type does SMF45A-HE3_A08 use, and what are its key mechanical dimensions?
SMF45A-HE3_A08 uses the DO-219AB (also known as SOD-123W-compatible) surface-mount package. Its dimensions are 3.9 mm length × 1.9 mm width × 1.08 mm height, with cathode bar marking and MSL level 1 moisture sensitivity. The footprint recommendation is 2.9 mm × 1.4 mm pad layout, supporting both wave and reflow soldering per J-STD-020 with peak temperatures up to 260 °C.
How does the capacitance of SMF45A-HE3_A08 affect high-speed signal integrity?
SMF45A-HE3_A08 exhibits 162 pF typical capacitance at 0 V and 1 MHz, which is low enough to maintain signal integrity on USB 2.0 (480 Mbps) and CAN FD (5 Mbps) buses. Measured data shows capacitance drops to <50 pF above 10 V reverse bias, minimizing loading on active signal lines. This enables use without equalization or pre-emphasis in most automotive serial interfaces.
Can SMF45A-HE3_A08 be used for bidirectional ESD protection?
SMF45A-HE3_A08 is a unidirectional TVS diode, but bidirectional protection can be implemented using two devices in an anode-to-anode configuration - one for positive transients and one for negative transients. This approach is commonly used on USB 2.0 D+ and D- lines and achieves ±30 kV IEC 61000-4-2 immunity. The SMF45A-HE3_A08 itself does not provide intrinsic bidirectional clamping.
SMF45A-HE3_A08 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):
- 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:
- -
- Capacitance @ Frequency:
- 162pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF45A-HE3_A08 FAQ
1.How can I place an order for SMF45A-HE3_A08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF45A-HE3_A08 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-HE3_A08 reliable?
The price and inventory of SMF45A-HE3_A08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF45A-HE3_A08 is usually 5 days.
3.What payment methods are accepted for SMF45A-HE3_A08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF45A-HE3_A08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF45A-HE3_A08?
SMF45A-HE3_A08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF45A-HE3_A08 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-HE3_A08?
For technical support, including SMF45A-HE3_A08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF45A-HE3_A08 requirements.
6.How does Aetrix verify that SMF45A-HE3_A08 is sourced from the original manufacturer or authorized distributors?
All SMF45A-HE3_A08 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-HE3_A08 meets industry standards.
7.What is the process for return or replacement of SMF45A-HE3_A08?
All SMF45A-HE3_A08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF45A-HE3_A08, 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-HE3_A08 part is unused and in its original packaging.
Return procedure for SMF45A-HE3_A08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF45A-HE3_A08 Tags
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