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Vishay General Semiconductor - Diodes Division SMF45A-HE3-08
- Part No.:
- SMF45A-HE3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF45A-HE3-08.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,791
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Product details
Overview
SMF45A-HE3-08 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 interfaces, HDMI signal paths, and automotive infotainment I/O protection.
For engineers reviewing the SMF45A-HE3-08 datasheet, SMF45A-HE3-08 pinout, SMF45A-HE3-08 application, or SMF45A-HE3-08 equivalent, this page delivers verified electrical parameters, package dimensions, real-world clamping behavior, AEC-Q101 qualification status, and direct alternatives for ESD-hardened board-level design.
Technical Context
This device operates as a single-channel unidirectional TVS diode with avalanche breakdown mechanism, optimized for low-capacitance (162 pF typical at 0 V, 1 MHz) and fast response (<1 ns) to electrostatic discharge events. Its DO-219AB package enables high thermal dissipation (RthJA = 180 K/W on 3 mm × 3 mm Cu pads) while maintaining compatibility with standard SMT reflow profiles up to 260 °C peak.
The SMF45A-HE3-08 meets AEC-Q101 stress test requirements for automotive-grade reliability, including human body model (HBM) >8 kV, and supports repetitive surge handling per IEC 61000-4-5 (8/20 μs, 1000 W) and IEC 61000-4-2 (±30 kV contact/air). Its reverse leakage remains ≤0.1 μA at VRWM = 45 V, ensuring minimal signal loading on protected lines.
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 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; critical for IC input stage survivability. |
| Capacitance (CD) | 162 pF at VR = 0 V, f = 1 MHz - Low enough for USB 2.0 (480 Mbps) and HDMI 1.4 signal integrity; avoids signal distortion or rise-time degradation. |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - Exceeds industrial and automotive ESD immunity requirements without external shielding. |
| Peak Pulse Power | 200 W (10/1000 μs), 1000 W (8/20 μs) - Supports multi-pulse surge resilience in power rail and interface line protection applications. |
| AEC-Q101 Qualified | Yes - Validated for automotive underhood and cabin electronics per stress test conditions including temperature cycling, HTRB, and UHAST. |
| Package | DO-219AB (SOD-123W compatible footprint) - 3.9 mm × 1.9 mm × 1.08 mm low-profile outline enabling dense PCB layouts and automated assembly. |
Pinout & Package
SMF45A-HE3-08 uses the DO-219AB (SMF) package: molded epoxy case with cathode band marking, 15 mg weight, and MSL level 1 moisture sensitivity rating. Compatible with wave and reflow soldering (peak 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (non-banded end) | Input/line side connection | Connected to signal or power line requiring ESD protection; conducts surge current toward ground path when clamped. |
| Cathode (banded end) | Ground reference terminal | Must be tied to low-impedance system ground plane; determines unidirectional conduction direction and clamping polarity. |
Key Features
| Feature | Design Value |
|---|---|
| Low clamping voltage | 72.7 V at 2.8 A ensures downstream ICs (e.g., USB transceivers rated to 75 V abs max) remain within safe operating limits during ESD events. |
| Ultra-low leakage | ≤0.1 μA at 45 V VRWM minimizes standby power loss and prevents false triggering in high-impedance sensor or analog signal paths. |
| Fast response time | <1 ns turn-on enables effective suppression of sub-nanosecond ESD transients before they reach sensitive inputs. |
| AEC-Q101 qualification | Validated for automotive use including temperature cycling (-65 °C to +175 °C), HTRB, and UHAST - suitable for ADAS camera modules and infotainment displays. |
| SOD-123W footprint compatibility | Enables drop-in replacement in existing designs using SOD-123W land patterns, reducing layout revision effort and NRE cost. |
Applications
| USB 2.0 Data Lines | HDMI 1.4 Interface |
|---|---|
Use Scenario: Protecting D+ and D− differential pairs in portable media players and docking stations against user-handling ESD. IC Role / Device Role: Unidirectional TVS diode placed between each data line and chassis ground. Use Value: 162 pF capacitance preserves 480 Mbps eye diagram integrity; 72.7 V clamping prevents damage to USB PHY transceivers with 75 V absolute max ratings. |
Use Scenario: Shielding TMDS clock and data channels in automotive head units from cable-discharge events during hot-plug. IC Role / Device Role: Single-channel ESD clamp on each TMDS pair, mounted adjacent to connector. Use Value: ±30 kV IEC 61000-4-2 rating eliminates need for secondary filtering; DO-219AB thermal performance sustains repeated surges without derating. |
| Automotive Infotainment Display | Industrial CAN FD Transceiver I/O |
Use Scenario: Guarding LVDS or MIPI DSI signal traces from ESD during service or panel integration in vehicle dashboards. IC Role / Device Role: Point-of-entry protection on display flex cable connectors. Use Value: AEC-Q101 qualification ensures operation across -40 °C to +125 °C ambient; 1.08 mm height fits tight bezel constraints. |
Use Scenario: Safeguarding CAN FD transceiver pins (TXD/RXD/CANH/CANL) in factory automation gateways exposed to maintenance personnel ESD. IC Role / Device Role: Discrete unidirectional clamp on each transceiver I/O node. Use Value: 45 V VRWM aligns with 12 V automotive supply rails; 200 W pulse rating handles coupled transients from nearby relay switching. |
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 | DO-214AC (SMA) package; 73.3 V VC at 2.7 A; 190 pF capacitance; same VRWM and AEC-Q101 qualified. | Larger footprint (4.5 mm × 2.7 mm) and higher thermal resistance (RthJA ≈ 220 K/W); less suitable for space-constrained USB/HDMI layouts. | Choose SMAJ45A-E3/57T only if legacy SMA land pattern exists or higher surge margin (1500 W, 8/20 μs) is required. |
| TPD2E001DRYR | 2-channel bidirectional array in SOT-563; 12 pF typical capacitance; 15 V VRWM; not AEC-Q101 qualified. | Designed for ultra-high-speed interfaces (USB 3.0, PCIe); insufficient VRWM for 12 V automotive bus protection. | Select TPD2E001DRYR for low-capacitance, multi-line protection in consumer electronics where AEC-Q101 is not mandated. |
Compared with SMAJ45A-E3/57T and TPD2E001DRYR, SMF45A-HE3-08 uniquely balances automotive qualification, compact DO-219AB size, and 162 pF capacitance - making it optimal for next-generation infotainment and ADAS signal line protection where board space and reliability are co-constrained.
Availability
SMF45A-HE3-08 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial USB-HID peripherals, and HDMI-enabled medical displays requiring stable component supply across extended product lifecycles.
Supply support for SMF45A-HE3-08 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 reliability-tested ESD protection solutions.
The SMF series targets high-reliability interface protection in automotive, industrial, and computing applications - engineered for low clamping, fast response, and AEC-Q101 compliance without sacrificing SMT manufacturability.
FAQ
What is the maximum clamping voltage of the SMF45A-HE3-08 under standard surge conditions?
The SMF45A-HE3-08 has a maximum clamping voltage (VC) of 72.7 V when subjected to a 10/1000 μs waveform at 2.8 A peak pulse current. This value is measured per IEC 61000-4-5 test conditions and ensures protected circuits remain within safe voltage margins. The SMF45A-HE3-08 maintains this clamping performance across its full operating temperature range of -65 °C to +175 °C.
Is the SMF45A-HE3-08 qualified for automotive applications?
Yes, the SMF45A-HE3-08 is AEC-Q101 qualified, having passed stress tests including temperature cycling, highly accelerated temperature-humidity stress (UHAST), and human body model (HBM) ESD (>8 kV). It is rated for operation from -65 °C to +175 °C junction temperature, making it suitable for under-hood and cabin-mounted automotive electronics such as display modules and telematics units.
What is the capacitance of the SMF45A-HE3-08 and how does it affect high-speed signal integrity?
The SMF45A-HE3-08 exhibits 162 pF typical capacitance at 0 V reverse bias and 1 MHz frequency. This value is low enough to avoid significant signal attenuation or rise-time degradation on USB 2.0 (480 Mbps) and HDMI 1.4 (up to 3.4 Gbps) links when placed close to connectors. The SMF45A-HE3-08's capacitance remains stable across operating voltage, supporting consistent ESD protection without compromising timing margins.
Does the SMF45A-HE3-08 support lead-free reflow soldering?
Yes, the SMF45A-HE3-08 is RoHS-compliant and rated for lead-free reflow soldering with a peak temperature of up to 260 °C, per J-STD-020 MSL level 1 guidelines. Its DO-219AB package uses tin-plated terminations and UL 94 V-0 molding compound, ensuring compatibility with standard SMT assembly lines and long-term intermetallic reliability.
How does the SMF45A-HE3-08 compare to bidirectional ESD diodes in terms of application scope?
The SMF45A-HE3-08 is unidirectional and optimized for DC-biased lines like automotive 12 V buses or USB VBUS, where polarity is fixed and lower clamping voltage is critical. Unlike bidirectional diodes, it cannot protect AC-coupled or floating signals without additional biasing. For applications requiring polarity-agnostic protection (e.g., audio jacks), a bidirectional alternative must be selected - but the SMF45A-HE3-08 delivers superior clamping and leakage performance where unidirectional operation is acceptable.
SMF45A-HE3-08 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:
- -
- Capacitance @ Frequency:
- 162pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF45A-HE3-08 FAQ
1.How can I place an order for SMF45A-HE3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF45A-HE3-08 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-HE3-08 reliable?
The price and inventory of SMF45A-HE3-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF45A-HE3-08 is usually 5 days.
3.What payment methods are accepted for SMF45A-HE3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF45A-HE3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF45A-HE3-08?
SMF45A-HE3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF45A-HE3-08 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-HE3-08?
For technical support, including SMF45A-HE3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF45A-HE3-08 requirements.
6.How does Aetrix verify that SMF45A-HE3-08 is sourced from the original manufacturer or authorized distributors?
All SMF45A-HE3-08 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-HE3-08 meets industry standards.
7.What is the process for return or replacement of SMF45A-HE3-08?
All SMF45A-HE3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF45A-HE3-08, 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-HE3-08 part is unused and in its original packaging.
Return procedure for SMF45A-HE3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF45A-HE3-08 Tags
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