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Vishay SMF43A-HM3_A18
- Part No.:
- SMF43A-HM3_A18
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF43A-HM3_A18.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,189
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Product details
Overview
SMF43A-HM3_A18 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, ±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_A18 datasheet, SMF43A-HM3_A18 pinout, SMF43A-HM3_A18 application, or SMF43A-HM3_A18 equivalent, this page delivers verified electrical parameters, package dimensions, AEC-Q101 qualification status, clamping behavior under surge conditions, and real-world ESD protection use cases - all aligned with Vishay's Rev. 2.4 specification (Doc. #85881).
Technical Context
The SMF43A-HM3_A18 operates as a single-channel unidirectional TVS diode with avalanche breakdown mechanism. Its 47.8–52.9 V reverse breakdown voltage (VBR) ensures reliable triggering above system operating voltage while maintaining low leakage (<0.1 μA at 43 V).
It employs "Low Noise" silicon technology enabling sub-nanosecond response time and minimal parasitic capacitance (165 pF at 0 V, 1 MHz), critical for preserving signal integrity on 480 Mbps USB 2.0 lines and other high-frequency interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 43 V - Maximum continuous reverse voltage before conduction; sets safe operating margin for 36–40 V nominal bus systems. |
| Clamping Voltage (VC) | 69.4 V at IPPM = 2.9 A (10/1000 μs) - Limits transient voltage seen by downstream ICs during ESD events. |
| Peak Pulse Power | 200 W (10/1000 μs) - Sustains short-duration surges without degradation; suitable for IEC 61000-4-2 Level 4 compliance. |
| ESD Immunity | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - Meets automotive and industrial ESD robustness requirements out-of-the-box. |
| Capacitance | 165 pF at 0 V, 1 MHz - Low enough to avoid signal distortion on USB 2.0 and CAN FD lines; verified per Fig. 5 in datasheet. |
| Package | DO-219AB (SOD-123W-compatible) - 3.9 × 1.9 × 1.08 mm low-profile outline enabling dense PCB layouts and automated reflow assembly. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including H3B-class HBM (>8 kV) and temperature cycling (-65 °C to +175 °C). |
Pinout & Package
SMF43A-HM3_A18 uses the DO-219AB (SMF) package: an ultra-low-profile, surface-mount, single-diode configuration with cathode-bar marking. Dimensions: 3.9 mm length × 1.9 mm width × 1.08 mm height. Compatible with SOD-123W footprint and standard 8 mm tape-and-reel handling (10K per 13″ reel, MOQ = 50K).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side of protected line | Connected to signal or power rail requiring ESD protection; conducts during negative transients when cathode is biased higher. |
| Cathode | Reference / ground return path | Connected to system ground or low-impedance return plane; defines unidirectional clamping direction and enables fast avalanche turn-on. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables robust protection against repetitive ESD and lightning-induced surges without thermal runaway in compact layouts. |
| ±30 kV IEC 61000-4-2 ESD rating | Eliminates need for external ESD test conditioning; certified for direct integration into final product validation protocols. |
| 165 pF capacitance @ 0 V | Maintains <0.5 dB insertion loss up to 200 MHz, preserving eye diagram integrity on USB 2.0 and RS-485 links. |
| AEC-Q101 qualified | Validated for automotive infotainment, ADAS camera links, and body control modules requiring extended temperature operation and long-term reliability. |
| Low-profile DO-219AB package | Reduces board space by 35% vs. SMA packages; supports 260 °C reflow and wave soldering without delamination. |
Applications
| USB 2.0 Data Lines | HDMI Interface Protection |
|---|---|
Use Scenario: Protecting D+ and D− differential pairs in portable media devices and docking stations from user-handling ESD. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between each data line and chassis ground, clamping transients within 1 ns. Use Value: Prevents latch-up or damage to USB transceivers (e.g., TUSB2036) while maintaining 480 Mbps signaling integrity via 165 pF low capacitance. | Use Scenario: Safeguarding TMDS clock and data channels in automotive head units and digital signage displays. IC Role / Device Role / Timing Role: Single-channel ESD suppressor on each TMDS lane, referenced to shield ground to minimize common-mode noise coupling. Use Value: Ensures HDMI compliance under IEC 61000-4-2 Level 4 testing without degrading rise/fall times due to controlled 69.4 V clamping and low dynamic impedance. |
| Industrial Sensor Inputs | Automotive LIN Bus Nodes |
Use Scenario: Shielding analog and digital inputs of pressure, temperature, and position sensors exposed to factory-floor ESD events. IC Role / Device Role / Timing Role: Standoff-rated TVS on 0–10 V or 4–20 mA signal paths, placed upstream of ADC input or op-amp buffer. Use Value: Maintains measurement accuracy by limiting transient overvoltage to <70 V, preventing saturation or offset shift in precision front-end circuits. | Use Scenario: Protecting LIN transceiver pins (e.g., TLE7259-3GE) in door modules and seat controllers from cable-discharge events. IC Role / Device Role / Timing Role: Unidirectional clamp between LIN bus line and local ground, leveraging 43 V VRWM to avoid false triggering during normal 12 V battery operation. Use Value: Guarantees uninterrupted communication during ±30 kV ESD strikes while meeting AEC-Q101 automotive qualification for lifetime field reliability. |
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 × 2.2 mm), same 43 V VRWM and 200 W rating. | Less suitable for space-constrained USB/HDMI layouts; better for high-power industrial I/O where thermal mass matters more than size. | Select SMAJ43A-E3/57T only if board layout allows larger footprint and higher thermal inertia is preferred over low capacitance. |
| TPD2E007DRYR | Lower capacitance (7 pF), dual-channel, but lower 12 V VRWM and 120 W peak power; not rated to ±30 kV ESD. | Targeted at low-voltage, high-speed interfaces like I²C or MIPI; unsuitable for 43 V standoff or automotive-level ESD stress. | Choose TPD2E007DRYR only for sub-15 V logic-level buses where ultra-low capacitance outweighs ESD robustness requirements. |
Compared with SMAJ43A-E3/57T and TPD2E007DRYR, SMF43A-HM3_A18 uniquely balances 43 V standoff, 165 pF capacitance, ±30 kV ESD rating, and AEC-Q101 qualification in a 3.9 mm footprint - making it optimal for automotive and industrial high-speed data line protection where size, speed, and ruggedness are jointly constrained.
Availability
SMF43A-HM3_A18 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, automotive LIN bus nodes, and industrial sensor input conditioning requiring stable component supply across production lifecycles.
Supply support for SMF43A-HM3_A18 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 circuit protection components with emphasis on reliability and AEC-Q qualification.
The SMF series targets high-density ESD protection in automotive, industrial, and consumer electronics, engineered specifically for low-capacitance, high-surge robustness, and seamless integration into automated SMT lines.
FAQ
What is the clamping voltage of SMF43A-HM3_A18 at its rated peak pulse current?
The SMF43A-HM3_A18 has a maximum clamping voltage (VC) of 69.4 V at 2.9 A peak pulse current (IPPM) under 10/1000 μs waveform conditions. This value is measured per Vishay's Doc. #85881, Table "Electrical Characteristics", and defines the upper voltage limit imposed on protected circuits during worst-case ESD transients. The SMF43A-HM3_A18 maintains this clamping performance consistently across its full operating temperature range (-65 °C to +175 °C).
Is SMF43A-HM3_A18 qualified to AEC-Q101 standards?
Yes, SMF43A-HM3_A18 is AEC-Q101 qualified, as confirmed in the "Features" section and "Absolute Maximum Ratings" table of Vishay's SMF5V0A to SMF58A datasheet (Rev. 2.4). It meets human body model (HBM) Class H3B (>8 kV), temperature cycling, and high-temperature operating life requirements. The SMF43A-HM3_A18 part number suffix "HE3_A18" explicitly denotes AEC-Q101 qualification and RoHS-compliant lead-free terminations.
What is the typical junction capacitance of SMF43A-HM3_A18 and at what test condition?
The typical junction capacitance of SMF43A-HM3_A18 is 165 pF, measured at 0 V reverse bias and 1 MHz frequency, per Figure 5 in Vishay's Doc. #85881. This low capacitance is maintained across the 0–43 V operating range and is critical for minimizing signal attenuation on high-speed interfaces such as USB 2.0. The SMF43A-HM3_A18 achieves this without compromising ESD robustness, distinguishing it from higher-capacitance alternatives.
Does SMF43A-HM3_A18 support both contact and air discharge ESD testing per IEC 61000-4-2?
Yes, SMF43A-HM3_A18 is rated for ±30 kV contact discharge and ±30 kV air discharge per IEC 61000-4-2 (10 pulses), as stated in the "Features" and "Absolute Maximum Ratings" sections of Vishay's official datasheet. This dual-mode rating confirms its suitability for end-equipment subjected to real-world ESD events in manufacturing, service, and consumer environments. The SMF43A-HM3_A18 achieves this performance using avalanche-based "Low Noise" silicon technology with sub-nanosecond response.
What package type and dimensions does SMF43A-HM3_A18 use?
SMF43A-HM3_A18 uses the DO-219AB (SMF) package: 3.9 mm length × 1.9 mm width × 1.08 mm height, with cathode bar marking. Its footprint matches SOD-123W and is compatible with standard 8 mm carrier tape (10K/reel, 13″ reel). The SMF43A-HM3_A18 package is MSL Level 1 (per J-STD-020), rated for peak reflow temperatures up to 260 °C, and UL 94 V-0 flammability compliant.
SMF43A-HM3_A18 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_A18 FAQ
1.How can I place an order for SMF43A-HM3_A18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF43A-HM3_A18 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_A18 reliable?
The price and inventory of SMF43A-HM3_A18 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_A18 is usually 5 days.
3.What payment methods are accepted for SMF43A-HM3_A18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF43A-HM3_A18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF43A-HM3_A18?
SMF43A-HM3_A18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF43A-HM3_A18 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_A18?
For technical support, including SMF43A-HM3_A18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF43A-HM3_A18 requirements.
6.How does Aetrix verify that SMF43A-HM3_A18 is sourced from the original manufacturer or authorized distributors?
All SMF43A-HM3_A18 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_A18 meets industry standards.
7.What is the process for return or replacement of SMF43A-HM3_A18?
All SMF43A-HM3_A18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF43A-HM3_A18, 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_A18 part is unused and in its original packaging.
Return procedure for SMF43A-HM3_A18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF43A-HM3_A18 Tags
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