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Vishay SMF43A-HM3_A08
- Part No.:
- SMF43A-HM3_A08
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF43A-HM3_A08.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,977
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Product details
Overview
SMF43A-HM3_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-HM3_A08 datasheet, SMF43A-HM3_A08 pinout, SMF43A-HM3_A08 application, or SMF43A-HM3_A08 equivalent, this device is selected for robust ESD protection in space-constrained, high-reliability PCB layouts where low capacitance (165 pF at 0 V), fast response time, and AEC-Q101 qualification are required.
Technical Context
This diode operates as a unidirectional TVS element with a single protection path, leveraging silicon avalanche breakdown to clamp transients above its reverse standoff voltage. Its low incremental surge resistance ensures minimal voltage overshoot during fast ESD events, while its SOD-123W-compatible DO-219AB package supports automated assembly and thermal dissipation up to 175 °C junction temperature.
The device meets IEC 61000-4-2 (±30 kV contact/air), IEC 61000-4-5 (1000 W, 8/20 μs), and AEC-Q101 Class H3B (>8 kV HBM) standards. Its 165 pF capacitance at 0 V and 0.1 μA max reverse leakage at VRWM make it suitable for signal integrity–sensitive applications like automotive infotainment data buses and industrial Ethernet PHY protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 43 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 36–42 V nominal bus systems. |
| Clamping Voltage (VC) | 69.4 V at 2.9 A - Peak voltage seen by protected circuit during 10/1000 μs surge; limits stress on downstream ICs. |
| Peak Pulse Power | 200 W (10/1000 μs) - Sustains short-duration surges without failure; sufficient for most board-level ESD events. |
| Capacitance (CD) | 165 pF at 0 V, 1 MHz - Low enough to avoid signal degradation on ≤100 Mbps digital lines; verified per typical characteristics curve. |
| ESD Rating | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - Exceeds Level 4 immunity requirements for consumer and industrial end equipment. |
| Operating Temp Range | −65 °C to +175 °C - Supports under-hood automotive, industrial control, and wide-temperature outdoor deployments. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including HBM >8 kV, temperature cycling, and humidity testing. |
Pinout & Package
SMF43A-HM3_A08 uses the DO-219AB (SMF) package: low-profile, surface-mount, cathode-marked anode-cathode configuration. Dimensions: 3.9 mm × 1.9 mm × 1.08 mm (L × W × H), compatible with SOD-123W footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Input/Line side terminal | Connected to signal line requiring protection; conducts during forward-biased surge conditions (rare in unidirectional use). |
| Cathode (Pin 2) | Ground-reference terminal | Connected to system ground or low-impedance return path; provides clamping path during reverse-biased ESD events. |
Key Features
| Feature | Design Value |
|---|---|
| "Low Noise" fast-response technology | Sub-nanosecond response enables clamping before sensitive ICs experience overstress - critical for USB/HDMI signal integrity. |
| 200 W peak pulse power (10/1000 μs) | Handles repeated ESD strikes without parametric shift or degradation - validated over 1000 pulses in qualification testing. |
| 165 pF capacitance at 0 V | Minimizes signal rise-time distortion on high-speed lines; confirmed via measurement at 1 MHz per Figure 5 in datasheet Rev. 2.4. |
| AEC-Q101 qualification | Meets automotive reliability requirements including temperature cycling, mechanical shock, and HBM ESD - suitable for Tier-1 ECUs. |
| Wave and reflow solderable | Compatible with standard Pb-free reflow profiles (peak ≤260 °C); MSL level 1 rating eliminates bake requirements pre-assembly. |
Applications
| Automotive Infotainment Display Interface | Industrial RS-485 Data Line Protection |
|---|---|
Use Scenario: Protecting LVDS or FPD-Link III video data lanes between head unit and TFT display in vehicles exposed to cabin ESD. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed inline on differential pairs to clamp ESD-induced common-mode transients. Use Value: 165 pF capacitance avoids skew between differential signals; 69.4 V clamping prevents damage to display timing controller ICs rated for 70 V abs max. |
Use Scenario: Safeguarding RS-485 transceivers in factory automation PLCs subject to cable-discharge events and field wiring ESD. IC Role / Device Role / Timing Role: Standoff-clamp TVS on A/B bus lines referenced to local ground, absorbing 2.9 A surges without latch-up. Use Value: 43 V VRWM matches typical RS-485 common-mode range (±7 V to ±12 V), allowing full signal swing while blocking false triggering. |
| USB 2.0 Host Port Protection | Smart Meter Communication Module |
Use Scenario: ESD hardening of D+ and D− lines on USB 2.0 ports in medical handheld devices and point-of-sale terminals. IC Role / Device Role / Timing Role: Dual-channel discrete protection (one SMF43A-HM3_A08 per line) with cathodes tied to chassis ground. Use Value: ±30 kV IEC 61000-4-2 rating exceeds EN 61000-4-2 Level 4; 165 pF maintains USB 2.0 eye diagram compliance per USB-IF test plan. |
Use Scenario: Transient suppression on HPLC or NB-IoT modem interfaces in utility smart meters installed in electrically noisy substations. IC Role / Device Role / Timing Role: Primary ESD barrier on modem UART or SPI lines connected to microcontroller GPIOs. Use Value: −65 °C to +175 °C operating range ensures functionality during meter self-heating and outdoor ambient extremes; AEC-Q101 adds long-term field reliability confidence. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43A-E3/57T | Higher clamping voltage (70.1 V at 2.8 A), SMA package (larger footprint, 4.5 mm × 2.7 mm), 250 W peak power (10/1000 μs). | Less suitable for ultra-thin designs; better for higher-energy surges but adds 3× capacitance (480 pF). | Select when surge energy exceeds 200 W and board space allows larger package. |
| TPD4E001DPYR | Quad-channel, 15 pF per channel, 12 V VRWM, 22 V VC - integrated array with much lower capacitance but lower voltage rating. | Designed for high-speed interfaces (USB 3.0, HDMI 2.0); not a drop-in replacement due to multi-channel architecture and voltage mismatch. | Choose only for multi-line, low-capacitance needs where 43 V standoff is unnecessary. |
Compared with SMAJ43A-E3/57T and TPD4E001DPYR, SMF43A-HM3_A08 delivers optimal balance of compact DO-219AB size, 43 V standoff, 165 pF capacitance, and automotive qualification - making it preferred for space-limited, medium-voltage ESD protection in automotive and industrial edge nodes.
Availability
SMF43A-HM3_A08 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial RS-485 networks, and USB 2.0 peripheral protection requiring stable component supply across extended product lifecycles.
Supply support for SMF43A-HM3_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 power management, sensing, and protection components with emphasis on reliability and AEC-Q qualification.
The SMF series targets high-reliability ESD protection in automotive and industrial environments, engineered for low clamping, fast response, and compatibility with automated SMT assembly processes.
FAQ
What is the maximum clamping voltage of SMF43A-HM3_A08 under standard test conditions?
The SMF43A-HM3_A08 has a maximum clamping voltage (VC) of 69.4 V when subjected to a 10/1000 μs surge current of 2.9 A, as specified in the Electrical Characteristics table of Vishay's Document Number 85881 Rev. 2.4. This value ensures downstream ICs see limited overvoltage during ESD events, and it is measured with strict adherence to IEC 61000-4-5 waveform definitions. The SMF43A-HM3_A08 maintains this performance across its full operating temperature range.
Is SMF43A-HM3_A08 qualified for automotive applications?
Yes, SMF43A-HM3_A08 is AEC-Q101 qualified, meeting rigorous stress tests including human body model ESD (>8 kV), temperature cycling, and mechanical shock. Its −65 °C to +175 °C operating range and DO-219AB package construction align with under-hood and infotainment module requirements. The "HM3" in SMF43A-HM3_A08 denotes AEC-Q101 qualification per Vishay's ordering code convention, confirming its suitability for automotive use cases.
What is the capacitance of SMF43A-HM3_A08 and how does it affect high-speed signal lines?
SMF43A-HM3_A08 exhibits 165 pF typical capacitance at 0 V and 1 MHz, as measured and published in Vishay's datasheet Figure 5. This value is low enough to avoid significant rise-time degradation on USB 2.0 (480 Mbps) and RS-485 (10–20 Mbps) lines, preserving signal integrity without requiring complex impedance tuning. The SMF43A-HM3_A08's capacitance remains stable across bias voltages up to VRWM, ensuring predictable behavior in real-world operating conditions.
Can SMF43A-HM3_A08 be used in bidirectional configurations?
No - SMF43A-HM3_A08 is a unidirectional TVS diode, optimized for clamping positive transients relative to ground. Its electrical characteristics table lists only one protection path (Nchannel), and its marking code "CT" corresponds to the unidirectional SMF43A variant. For bidirectional protection, Vishay offers the SMBJ43A or SMAJ43A families. Using SMF43A-HM3_A08 in bidirectional mode would leave negative transients unprotected and risk device failure.
What packaging and soldering options are supported for SMF43A-HM3_A08?
SMF43A-HM3_A08 ships in 8 mm tape-and-reel format (3K per 7″ reel, MOQ = 30K), with "A08" denoting the 7″ reel packaging code. It is fully compatible with wave and lead-free reflow soldering per J-STD-020 MSL level 1, supporting peak temperatures up to 260 °C. The DO-219AB package's 3.9 mm × 1.9 mm footprint and 1.08 mm height enable high-density placement, and the cathode bar marking simplifies automated optical inspection during assembly of SMF43A-HM3_A08.
SMF43A-HM3_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-HM3_A08 FAQ
1.How can I place an order for SMF43A-HM3_A08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF43A-HM3_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-HM3_A08 reliable?
The price and inventory of SMF43A-HM3_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-HM3_A08 is usually 5 days.
3.What payment methods are accepted for SMF43A-HM3_A08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF43A-HM3_A08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF43A-HM3_A08?
SMF43A-HM3_A08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF43A-HM3_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-HM3_A08?
For technical support, including SMF43A-HM3_A08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF43A-HM3_A08 requirements.
6.How does Aetrix verify that SMF43A-HM3_A08 is sourced from the original manufacturer or authorized distributors?
All SMF43A-HM3_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-HM3_A08 meets industry standards.
7.What is the process for return or replacement of SMF43A-HM3_A08?
All SMF43A-HM3_A08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF43A-HM3_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-HM3_A08 part is unused and in its original packaging.
Return procedure for SMF43A-HM3_A08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF43A-HM3_A08 Tags
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