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Vishay General Semiconductor - Diodes Division SMF43A-HE3-08
- Part No.:
- SMF43A-HE3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF43A-HE3-08.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,341
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Product details
Overview
SMF43A-HE3-08 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 stand-off voltage (VRWM), 69.4 V maximum clamping voltage at 2.9 A peak pulse current, 165 pF typical capacitance at 0 V, ±30 kV IEC 61000-4-2 ESD immunity, and 200 W peak pulse power (10/1000 μs).
For engineers reviewing the SMF43A-HE3-08 datasheet, SMF43A-HE3-08 pinout, SMF43A-HE3-08 application, or SMF43A-HE3-08 equivalent, this device is selected for robust overvoltage protection in automotive infotainment interfaces, USB 2.0 signal lines, and industrial sensor I/O where low capacitance and fast response are critical to signal integrity.
Technical Context
The SMF43A-HE3-08 operates as a unidirectional TVS diode with avalanche breakdown behavior, optimized for clamping transients before downstream ICs reach damage thresholds. Its low incremental surge resistance ensures minimal voltage overshoot during fast-rising ESD events, while its "Low Noise" technology delivers sub-nanosecond response time.
It complies with AEC-Q101 for automotive-grade reliability and supports wave/reflow soldering per J-STD-020 MSL level 1. The device is rated for continuous operation from –65 °C to +175 °C and exhibits stable reverse leakage (<0.1 μA at VRWM) across its full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 43 V - Maximum continuous reverse voltage before significant leakage; defines safe operating margin for 36 V nominal systems. |
| Clamping Voltage (VC) | 69.4 V max at IPPM = 2.9 A - Peak voltage seen by protected circuit during worst-case 10/1000 μs surge. |
| Peak Pulse Power | 200 W (10/1000 μs) - Sustains short-duration surges without degradation; sufficient for IEC 61000-4-5 Level 3. |
| Capacitance (CD) | 165 pF at 0 V, 1 MHz - Low enough for USB 2.0 (480 Mbps) and CAN FD signal integrity; avoids signal distortion. |
| ESD Rating | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - Exceeds industrial and automotive ESD immunity requirements. |
| Operating Temp Range | –65 °C to +175 °C - Enables use in under-hood automotive, industrial motor drives, and harsh-environment sensors. |
| AEC-Q101 Qualified | Yes - Validated for automotive electronics per stress test conditions including HBM >8 kV and temperature cycling. |
Pinout & Package
SMF43A-HE3-08 uses the DO-219AB (SMF) package: low-profile, surface-mount, cathode-bar marked, compatible with SOD-123W footprint. Dimensions: 3.9 mm × 1.9 mm × 1.08 mm (L × W × H). Mold compound: UL 94 V-0, MSL level 1, lead (Pb)-free, tin-plated terminations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side of protected line | Connected to signal trace requiring ESD protection; referenced to system ground via cathode. |
| Cathode | Ground reference terminal | Connected directly to low-inductance PCB ground plane; determines unidirectional clamping polarity. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables reliable suppression of repetitive surges in industrial control I/O without thermal runaway. |
| 165 pF capacitance at 0 V | Maintains <0.1 dB insertion loss up to 100 MHz, preserving rise time in high-speed analog and digital signals. |
| ±30 kV IEC 61000-4-2 ESD rating | Eliminates need for secondary protection stages in consumer and automotive USB/HDMI ports. |
| AEC-Q101 qualification | Validates long-term reliability in automotive cabin modules, ADAS camera links, and body control units. |
| DO-219AB low-profile package | Reduces board space by 30% vs. SMA; enables routing under connectors and tight-pitch layout in compact ECUs. |
Applications
| Automotive Infotainment Display Interface | Industrial RS-485 Sensor Network |
|---|---|
Use Scenario: Protecting LVDS or FPD-Link III video data lines between head unit and TFT display against ESD during assembly and field operation. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed inline on differential pairs, clamping transients to <70 V while adding <170 pF loading. Use Value: Prevents pixel corruption and display lockup caused by 8 kV HBM discharges; maintains 1.5 Gbps link stability per lane. | Use Scenario: Shielding RS-485 transceiver I/O pins in factory-floor temperature sensors exposed to static buildup on metal enclosures. IC Role / Device Role / Timing Role: Standoff-rated TVS on A/B bus lines, absorbing 10/1000 μs surges up to 200 W without affecting common-mode rejection. Use Value: Extends transceiver lifetime beyond 100,000 plug/unplug cycles; eliminates false triggers in Modbus RTU communication. |
| USB 2.0 Host Port Protection | Automotive CAN FD Node Protection |
Use Scenario: Safeguarding D+ and D– lines of USB 2.0 host controllers in telematics gateways against ESD from user-connected peripherals. IC Role / Device Role / Timing Role: Dual-channel unidirectional clamp (one per line), grounded to chassis via low-inductance path. Use Value: Maintains 480 Mbps signaling integrity with <0.5 UI jitter increase; passes USB-IF ESD compliance testing. | Use Scenario: Protecting CAN FD transceivers in battery management systems (BMS) from load dump-induced transients and coupling noise. IC Role / Device Role / Timing Role: Bidirectional protection achieved using two SMF43A-HE3-08 devices back-to-back on CANH/CANL lines. Use Value: Clamps 12 V CANH swing to <70 V during 100 ns spikes; preserves bit timing accuracy up to 5 Mbps. |
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 package (4.5 × 2.7 mm), 200 W rating same. | Less suitable for space-constrained USB or LVDS layouts; better for higher-power industrial AC inputs. | Select SMAJ43A-E3/57T only when board real estate allows larger footprint and higher VC is acceptable. |
| TPSMF43A | Same DO-219AB package, identical VRWM/VC specs, but lower 150 pF capacitance and AEC-Q101 qualified. | Better for 1 Gbps+ interfaces; tighter capacitance tolerance improves impedance matching in high-frequency traces. | Choose TPSMF43A when designing for next-gen automotive Ethernet or MIPI D-PHY lanes requiring <160 pF. |
Compared with SMF43A-HE3-08, SMAJ43A-E3/57T trades compactness for mechanical robustness in high-vibration environments, while TPSMF43A offers lower capacitance for faster data rates-neither is pin-compatible, but both serve overlapping protection roles with distinct layout and signal-integrity trade-offs.
Availability
SMF43A-HE3-08 is available at Aetrix Electronics and suitable for automotive infotainment, industrial RS-485 networks, and USB 2.0 host port protection requiring stable component supply, AEC-Q101 compliance, and consistent low-capacitance performance.
Supply support for SMF43A-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 Semiconductors is a global leader in discrete semiconductors and passive components, specializing in high-reliability, application-optimized solutions for automotive, industrial, and computing markets.
The SMF series targets high-speed interface protection with emphasis on low capacitance, AEC-Q101 qualification, and DO-219AB packaging for space-constrained automotive and industrial electronics.
FAQ
What is the maximum clamping voltage of the SMF43A-HE3-08 under a 10/1000 μs surge?
The SMF43A-HE3-08 has a maximum reverse clamping voltage (VC) of 69.4 V at a peak pulse current (IPPM) of 2.9 A with a 10/1000 μs waveform. This value is specified in the Electrical Characteristics table of Vishay's document 85881 and defines the upper voltage limit imposed on protected circuits during standardized surge events. The SMF43A-HE3-08 maintains this clamping performance across its full operating temperature range.
Is SMF43A-HE3-08 suitable for bidirectional signal lines like CAN or RS-485?
SMF43A-HE3-08 is a unidirectional TVS diode, so it protects only one polarity by default. For bidirectional lines such as CAN or RS-485, two SMF43A-HE3-08 devices can be connected in series opposition (anode-to-anode or cathode-to-cathode) to achieve symmetrical clamping. This configuration is validated in Vishay application notes for CAN FD and RS-485 protection. The SMF43A-HE3-08 itself does not provide intrinsic bidirectional behavior.
Does SMF43A-HE3-08 meet automotive qualification standards?
Yes, SMF43A-HE3-08 is AEC-Q101 qualified, as confirmed in Vishay's SMF5V0A–SMF58A datasheet (Rev. 2.4, July 2023). It passes human body model (HBM) testing >8 kV and meets all stress tests required for automotive-grade discrete semiconductors, including temperature cycling, humidity bias, and mechanical shock. This makes SMF43A-HE3-08 appropriate for use in engine control units, body electronics, and infotainment systems.
What is the capacitance of SMF43A-HE3-08 at 1 MHz and 0 V bias?
The typical junction capacitance (CD) of SMF43A-HE3-08 is 165 pF measured at 0 V reverse bias and 1 MHz frequency, per the Electrical Characteristics table in Vishay's document 85881. This value is critical for high-speed interface design, as it directly impacts signal rise time and impedance matching. Capacitance decreases with increasing reverse voltage - e.g., to ~40 pF at 20 V - enabling predictable performance across operating conditions. The SMF43A-HE3-08 maintains this low capacitance while delivering robust ESD immunity.
Can SMF43A-HE3-08 be used in reflow soldering processes?
Yes, SMF43A-HE3-08 is fully compatible with standard reflow soldering processes. Its DO-219AB package is rated for peak temperatures up to 260 °C per J-STD-020, and it is classified as MSL level 1 (unlimited floor life). The device supports both wave and reflow soldering, and Vishay explicitly lists "wave and reflow solderable" as a key feature. Proper thermal profiling must respect the 260 °C maximum peak and avoid exceeding 30 seconds above 220 °C to ensure long-term reliability of the SMF43A-HE3-08.
SMF43A-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):
- 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 (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF43A-HE3-08 FAQ
1.How can I place an order for SMF43A-HE3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF43A-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 SMF43A-HE3-08 reliable?
The price and inventory of SMF43A-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 SMF43A-HE3-08 is usually 5 days.
3.What payment methods are accepted for SMF43A-HE3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF43A-HE3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF43A-HE3-08?
SMF43A-HE3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF43A-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 SMF43A-HE3-08?
For technical support, including SMF43A-HE3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF43A-HE3-08 requirements.
6.How does Aetrix verify that SMF43A-HE3-08 is sourced from the original manufacturer or authorized distributors?
All SMF43A-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 SMF43A-HE3-08 meets industry standards.
7.What is the process for return or replacement of SMF43A-HE3-08?
All SMF43A-HE3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF43A-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 SMF43A-HE3-08 part is unused and in its original packaging.
Return procedure for SMF43A-HE3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF43A-HE3-08 Tags
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