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Vishay SMF43A-HE3_A08
- Part No.:
- SMF43A-HE3_A08
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF43A-HE3_A08.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,613
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Product details
Overview
SMF43A-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. It features a 43 V standoff voltage (VRWM), 69.4 V maximum clamping voltage at 2.9 A peak pulse current, ±30 kV IEC 61000-4-2 ESD immunity, and 200 W peak pulse power (10/1000 μs). It is used to safeguard USB 2.0, HDMI, and industrial sensor interfaces against electrostatic discharge.
For engineers reviewing the SMF43A-HE3_A08 datasheet, SMF43A-HE3_A08 pinout, SMF43A-HE3_A08 application, or SMF43A-HE3_A08 equivalent, key selection criteria include clamping voltage margin relative to IC I/O rails, capacitance impact on signal integrity (<165 pF at 0 V), AEC-Q101 qualification status, SOD-123W-compatible footprint, and low incremental surge resistance for fast transient response.
Technical Context
This device operates as a unidirectional avalanche diode with cathode-anode polarity, leveraging silicon planar technology to achieve sub-nanosecond response time under ESD stress. Its clamping behavior is defined by a sharp reverse breakdown knee (VBR min = 47.8 V, max = 52.9 V at 1 mA), enabling precise overvoltage protection without premature conduction during normal operation.
The SMF43A-HE3_A08 is optimized for low-capacitance, high-power transient suppression: it delivers 200 W peak pulse power (10/1000 μs), supports ±30 kV contact/air discharge per IEC 61000-4-2, and maintains thermal stability up to TJ = 175 °C with RthJA = 180 K/W on standard epoxy-glass PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 43 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for protected line voltage. |
| Clamping Voltage (VC) | 69.4 V max at IPPM = 2.9 A - Peak voltage seen by downstream circuit during 10/1000 μs surge; defines worst-case stress on IC I/O. |
| Capacitance (CD) | 165 pF typical at 0 V, 1 MHz - Directly impacts signal rise time and insertion loss in high-speed interfaces like USB 2.0. |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - Confirmed immunity level for end-equipment compliance testing. |
| Peak Pulse Power | 200 W (10/1000 μs) - Sustains short-duration transients without degradation; validated per IEC 61000-4-5 waveform. |
| Operating Temp Range | –65 °C to +175 °C - Enables use in automotive under-hood, industrial motor control, and aerospace environments. |
| AEC-Q101 Qualified | Yes - Certified for automotive-grade reliability including HBM > 8 kV and temperature cycling, vibration, and humidity testing. |
Pinout & Package
SMF43A-HE3_A08 uses the DO-219AB (SMF) package: low-profile, surface-mount, molded plastic case with cathode band marking. Dimensions: 3.9 mm × 1.9 mm × 1.08 mm (L × W × H), compatible with SOD-123W, SOD-123F, and SOD-123FL footprints. Reflow solderable per J-STD-020 MSL level 1 (peak 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal | Connected to system ground or low-impedance return path; completes clamping loop during ESD event. |
| Cathode | Protected line input | Connected to signal line (e.g., USB D+, HDMI TMDS+); conducts avalanche current when VRWM exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise fast-response technology | Sub-nanosecond turn-on enables clamping before sensitive ICs experience overstress during ESD events. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving clamping precision and downstream IC safety margin. |
| Wave and reflow solderable | Compatible with standard SMT assembly processes without special handling or pre-baking requirements. |
| UL 94 V-0 molding compound | Ensures flame-retardant performance in enclosed industrial and automotive enclosures per safety standards. |
| 15 mg package weight | Supports lightweight design in portable and space-constrained applications such as handheld test equipment. |
Applications
| USB 2.0 Interface Protection | HDMI Signal Line Protection |
|---|---|
Use Scenario: Protecting USB 2.0 data lines (D+/D−) in embedded host controllers and peripheral devices from ESD events during hot-plug or handling. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed between connector and PHY IC, with cathode tied to signal line and anode to ground. Use Value: 165 pF capacitance avoids signal integrity degradation at 480 Mbps; 69.4 V clamping ensures safe margin above 3.3 V rail. | Use Scenario: Safeguarding HDMI TMDS channels in set-top boxes, monitors, and media players against user-induced ESD during cable insertion. IC Role / Device Role / Timing Role: Point-of-entry ESD clamp on each differential pair, mounted adjacent to HDMI connector to minimize trace inductance. Use Value: ±30 kV IEC 61000-4-2 rating meets IEC 62368-1 end-equipment requirements; DO-219AB footprint allows compact layout near connector. |
| Automotive Sensor Interface | Industrial CAN Bus Node |
Use Scenario: Protecting analog sensor outputs (e.g., pressure, temperature) in engine control units and ADAS modules exposed to harsh ESD environments. IC Role / Device Role / Timing Role: Low-leakage (0.1 μA at 43 V) unidirectional TVS placed directly at sensor harness entry point. Use Value: –65 °C to +175 °C operating range supports under-hood deployment; AEC-Q101 qualification confirms automotive reliability. | Use Scenario: Adding secondary ESD protection on CAN_H/CAN_L lines downstream of primary transceiver, especially in gateways and junction boxes. IC Role / Device Role / Timing Role: Standby-mode clamping device that activates only during extreme transients beyond transceiver's built-in protection. Use Value: 200 W peak pulse power handles coupled surges from ISO 7637-3; low capacitance prevents CAN bit timing distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43A-E3/57T | Higher clamping voltage (70.1 V), larger SMA (DO-214AC) package (4.5 mm × 2.7 mm), 200 W rating same. | Less suitable for ultra-compact layouts; higher thermal resistance limits power dissipation in dense PCBs. | Choose when board space permits larger footprint and higher clamping margin is acceptable. |
| TPSMF43A | Same DO-219AB package, identical electrical specs (43 V VRWM, 69.4 V VC), but not AEC-Q101 qualified. | Limited to commercial/industrial use; lacks automotive qualification documentation and test reports. | Choose for cost-sensitive non-automotive designs where AEC-Q101 is not mandated. |
Compared with SMAJ43A-E3/57T and TPSMF43A, SMF43A-HE3_A08 uniquely combines AEC-Q101 qualification, DO-219AB miniaturization, and verified ±30 kV ESD performance-making it optimal for space-constrained automotive and industrial edge nodes requiring full compliance traceability.
Availability
SMF43A-HE3_A08 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI signal line safeguarding, and automotive sensor interface applications requiring stable component supply across production lifecycles.
Supply support for SMF43A-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 is part of Vishay's eSMP® family, engineered specifically for high-power, low-capacitance ESD protection in space-constrained, high-reliability applications-including automotive infotainment, ADAS sensors, and industrial IoT connectivity.
FAQ
What is the standoff voltage rating of the SMF43A-HE3_A08?
The SMF43A-HE3_A08 has a maximum standoff voltage (VRWM) of 43 V, meaning it remains non-conductive up to this reverse voltage during normal operation. This value is critical for ensuring compatibility with 36 V nominal systems and provides sufficient margin above common 24 V industrial bus voltages while avoiding false triggering.
Is SMF43A-HE3_A08 AEC-Q101 qualified?
Yes, SMF43A-HE3_A08 is AEC-Q101 qualified, having passed standardized stress tests for automotive-grade reliability including human body model ESD (> 8 kV), temperature cycling, mechanical shock, and humidity exposure. This qualification is documented in Vishay's official certification reports and applies specifically to the HE3_A08 variant.
What is the clamping voltage of SMF43A-HE3_A08 at its rated peak pulse current?
The SMF43A-HE3_A08 exhibits a maximum clamping voltage (VC) of 69.4 V at its rated peak pulse current (IPPM) of 2.9 A using a 10/1000 μs waveform. This value represents the highest voltage imposed on the protected circuit during a standardized surge event and must be compared against the absolute maximum ratings of downstream ICs.
Does SMF43A-HE3_A08 support automated SMT assembly?
Yes, SMF43A-HE3_A08 is fully compatible with wave and reflow soldering processes, conforming to J-STD-020 moisture sensitivity level 1 with a peak reflow temperature of 260 °C. Its DO-219AB package features symmetric terminations and stable thermal profile, enabling high-yield placement and soldering in high-volume manufacturing.
What is the typical capacitance of SMF43A-HE3_A08 at zero bias?
The SMF43A-HE3_A08 has a typical capacitance of 165 pF at 0 V reverse bias and 1 MHz frequency. This low, well-characterized capacitance minimizes loading effects on high-speed signals-making it suitable for USB 2.0, HDMI, and other interfaces where maintaining signal integrity up to 480 Mbps is essential.
SMF43A-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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 2.9A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 165pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF43A-HE3_A08 FAQ
1.How can I place an order for SMF43A-HE3_A08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF43A-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 SMF43A-HE3_A08 reliable?
The price and inventory of SMF43A-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 SMF43A-HE3_A08 is usually 5 days.
3.What payment methods are accepted for SMF43A-HE3_A08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF43A-HE3_A08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF43A-HE3_A08?
SMF43A-HE3_A08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF43A-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 SMF43A-HE3_A08?
For technical support, including SMF43A-HE3_A08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF43A-HE3_A08 requirements.
6.How does Aetrix verify that SMF43A-HE3_A08 is sourced from the original manufacturer or authorized distributors?
All SMF43A-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 SMF43A-HE3_A08 meets industry standards.
7.What is the process for return or replacement of SMF43A-HE3_A08?
All SMF43A-HE3_A08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF43A-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 SMF43A-HE3_A08 part is unused and in its original packaging.
Return procedure for SMF43A-HE3_A08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF43A-HE3_A08 Tags
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