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Vishay General Semiconductor - Diodes Division SMF43A-E3-18
- Part No.:
- SMF43A-E3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF43A-E3-18.pdf
- Description:
- TVS DIODE 43VWM 69.4VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:48,100
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Product details
Overview
SMF43A-E3-18 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 A peak pulse current (IPPM) at 10/1000 μs, 165 pF typical capacitance at 0 V, ±30 kV IEC 61000-4-2 ESD immunity, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SMF43A-E3-18 datasheet, SMF43A-E3-18 pinout, SMF43A-E3-18 application, or SMF43A-E3-18 equivalent, this device is selected for robust ESD hardening of USB 2.0, HDMI, CAN FD, and automotive sensor interfaces where low clamping voltage (<69.4 V), fast response time, and low capacitance are critical to signal integrity.
Technical Context
The SMF43A-E3-18 operates as a unidirectional TVS diode with avalanche breakdown behavior, triggered when reverse voltage exceeds its 47.8–52.9 V breakdown range (VBR). Its low incremental surge resistance ensures tight clamping during transients, while its SOD-123W-compatible DO-219AB package supports automated reflow assembly and meets MSL level 1 handling requirements.
It delivers 200 W peak pulse power (10/1000 μs), 1000 W (8/20 μs), and maintains <0.1 μA leakage at VRWM = 43 V. The junction operates from –65 °C to +175 °C, enabling deployment in under-hood automotive environments and industrial control systems requiring extended thermal resilience.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 43 V - Maximum continuous reverse operating voltage before clamping begins; defines safe interface voltage margin. |
| Breakdown Voltage (VBR) | 47.8–52.9 V at 1 mA - Confirmed avalanche threshold range; ensures predictable turn-on during overvoltage events. |
| Peak Pulse Current (IPPM) | 69.4 A at 10/1000 μs - Sustains high-energy surges without failure; supports IEC 61000-4-5 Level 3 compliance. |
| Clamping Voltage (VC) | ≤69.4 V at IPPM - Limits downstream voltage stress on protected ICs; critical for safeguarding 48 V-rated receivers. |
| Capacitance (CD) | 165 pF at 0 V, 1 MHz - Low enough for USB 2.0 (480 Mbps) and CAN FD (5 Mbps) without signal distortion. |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - Meets highest system-level ESD immunity requirement for automotive ECUs. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including HBM >8 kV; enables use in ASIL-B functional safety paths. |
Pinout & Package
The SMF43A-E3-18 uses the DO-219AB (SMF) package: 3.9 mm × 1.9 mm × 1.08 mm, low-profile, molded in UL 94 V-0 compound, with cathode marked by a bar on the top surface. It is compatible with SOD-123W footprint and supports wave/reflow soldering (peak 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (end without bar) | Input side of protected line | Connected to signal trace upstream of IC input; carries surge current into diode during positive transients. |
| Cathode (bar-marked end) | Ground reference node | Connected to low-impedance chassis or signal ground; provides return path for clamped current with minimal inductance. |
Key Features
| Feature | Design Value |
|---|---|
| "Low Noise" fast-response technology | Sub-nanosecond response enables clamping before sensitive IC inputs exceed absolute maximum ratings. |
| 200 W peak pulse power (10/1000 μs) | Handles repeated EFT bursts and lightning-induced surges in industrial fieldbus nodes without degradation. |
| AEC-Q101 qualification | Validated for automotive under-hood operation including temperature cycling, humidity bias, and mechanical shock. |
| 165 pF capacitance at 0 V | Preserves signal rise/fall times in 480 Mbps USB 2.0 links; avoids jitter or eye closure in differential pairs. |
| DO-219AB package with MSL level 1 rating | Enables single-pass reflow assembly without baking; reduces manufacturing cost and process complexity. |
Applications
| Automotive Sensor Interface | USB 2.0 Port Protection |
|---|---|
Use Scenario: Protecting LIN/CAN transceivers and analog sensor outputs (e.g., pressure, temperature) in engine control modules exposed to load dump and ESD. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between signal line and chassis ground to clamp transients before reaching the transceiver's input pins. Use Value: Prevents latch-up and permanent damage to automotive-grade transceivers operating at 12 V/24 V supply rails while maintaining <100 ns response. | Use Scenario: Safeguarding USB 2.0 D+/D− lines on infotainment head units against hot-plug ESD and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional pair (two SMF43A-E3-18 devices) used per differential pair to suppress common-mode and differential transients. Use Value: Maintains 480 Mbps data integrity with <165 pF loading and clamps to ≤69.4 V-well below USB PHY absolute max rating of 7 V. |
| HDMI Source Port Protection | Industrial CAN FD Node |
Use Scenario: Shielding HDMI TMDS clock and data channels in set-top boxes and display controllers from ESD during user interaction and board handling. IC Role / Device Role / Timing Role: Single SMF43A-E3-18 per TMDS channel (with ground-referenced cathode) to limit voltage overshoot during contact discharge. Use Value: Enables compliance with IEC 61000-4-2 Level 4 (±15 kV air) while adding <0.1 dB insertion loss at 225 MHz (HDMI 1.4 bandwidth). | Use Scenario: Hardening CAN FD physical layer (ISO 11898-2) in battery management systems and motor drives subjected to high dv/dt noise and coupling. IC Role / Device Role / Timing Role: Placed across CANH–CANL differential pair (cathodes tied together to ground) to suppress common-mode surges up to 69.4 V. Use Value: Ensures bus uptime during 100 kbps–5 Mbps operation by limiting fault voltage to non-destructive levels without distorting bit timing. |
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 1.5 mm height (SMA package), 70 A IPPM, 70 V VC, 170 pF - larger footprint, lower thermal resistance. | Preferred for higher-power industrial surge zones; less suitable for space-constrained automotive PCBs. | Select SMAJ43A-E3/57T only if board layout allows SMA footprint and thermal dissipation >200 W is required. |
| TPD2E001DRYR | 2-channel, 15 pF, 12 V VRWM, ±8 kV ESD - integrated dual-channel low-capacitance array, not AEC-Q101 qualified. | Better for high-speed digital interfaces (e.g., I²C, UART); insufficient for 43 V rail protection or automotive qualification. | Choose TPD2E001DRYR for compact, low-capacitance protection of sub-12 V logic lines-not for SMF43A-E3-18's 43 V/automotive role. |
Compared with SMAJ43A-E3/57T and TPD2E001DRYR, the SMF43A-E3-18 uniquely balances AEC-Q101 qualification, 43 V stand-off, 165 pF capacitance, and DO-219AB low-profile packaging-making it optimal for automotive sensor and medium-speed serial interface protection where space, reliability, and voltage rating are jointly constrained.
Availability
SMF43A-E3-18 is available at Aetrix Electronics and suitable for automotive sensor interfaces, USB 2.0 port protection, HDMI source ports, and industrial CAN FD nodes requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant sourcing.
Supply support for SMF43A-E3-18 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 automotive-grade validation.
The SMF series targets high-reliability ESD and surge protection in automotive and industrial applications, engineered specifically for AEC-Q101 compliance, low-profile mounting, and precise clamping performance across wide temperature ranges.
FAQ
What is the clamping voltage of the SMF43A-E3-18 at its rated peak pulse current?
The SMF43A-E3-18 has a maximum reverse clamping voltage (VC) of 69.4 V when subjected to its rated 69.4 A peak pulse current (IPPM) under 10/1000 μs waveform conditions. This value is measured per IEC 61000-4-5 test methodology and ensures downstream ICs see no more than 69.4 V during worst-case surge events. The SMF43A-E3-18 achieves this clamping performance while maintaining low incremental surge resistance, directly supporting robust protection of 48 V-rated interfaces.
Is the SMF43A-E3-18 suitable for bidirectional signal lines like USB D+ and D−?
The SMF43A-E3-18 is a unidirectional TVS diode and must be used in back-to-back configuration (two devices) to protect bidirectional lines such as USB D+ and D−. Each SMF43A-E3-18 connects anode-to-line and cathode-to-ground, forming a symmetrical clamping path for both polarities. This arrangement preserves the SMF43A-E3-18's 165 pF capacitance and ±30 kV ESD rating while enabling full differential protection without compromising signal integrity at 480 Mbps.
Does the SMF43A-E3-18 meet AEC-Q101 requirements for automotive under-hood applications?
Yes, the SMF43A-E3-18 is explicitly AEC-Q101 qualified per the Vishay datasheet Rev. 2.4 (04-Jul-2023), with validation including human body model (HBM) Class H3B (>8 kV), temperature cycling, and high-temperature operating life testing. Its –65 °C to +175 °C operating range, DO-219AB package MSL level 1 rating, and UL 94 V-0 molding compound make the SMF43A-E3-18 suitable for under-hood engine control units, battery sensors, and ADAS domain controllers.
What is the leakage current specification for the SMF43A-E3-18 at its stand-off voltage?
At its 43 V stand-off voltage (VRWM), the SMF43A-E3-18 exhibits a maximum reverse leakage current (IR) of 0.1 μA at 25 °C, per the Electrical Characteristics table in the Vishay datasheet. This ultra-low leakage ensures negligible power drain in always-on automotive circuits and prevents false triggering in high-impedance sensor signal paths. The SMF43A-E3-18 maintains this performance across its full operating temperature range, supporting reliable long-term operation in battery-sensitive systems.
Can the SMF43A-E3-18 be used in place of the SMF40A-E3-18 or SMF45A-E3-18?
The SMF43A-E3-18 is not a direct replacement for SMF40A-E3-18 (40 V VRWM) or SMF45A-E3-18 (45 V VRWM), as each has distinct stand-off and breakdown voltages. Substituting requires verifying that the protected circuit's normal operating voltage remains ≥10 % below the new VRWM and that clamping voltage (VC) stays within downstream IC absolute maximum ratings. The SMF43A-E3-18's 43 V VRWM offers tighter margin for 36–42 V nominal systems, whereas SMF45A-E3-18 suits 40–44 V rails. Always validate with actual surge testing.
SMF43A-E3-18 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:
- General Purpose
- Capacitance @ Frequency:
- 165pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF43A-E3-18 FAQ
1.How can I place an order for SMF43A-E3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF43A-E3-18 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-E3-18 reliable?
The price and inventory of SMF43A-E3-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF43A-E3-18 is usually 5 days.
3.What payment methods are accepted for SMF43A-E3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF43A-E3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF43A-E3-18?
SMF43A-E3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF43A-E3-18 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-E3-18?
For technical support, including SMF43A-E3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF43A-E3-18 requirements.
6.How does Aetrix verify that SMF43A-E3-18 is sourced from the original manufacturer or authorized distributors?
All SMF43A-E3-18 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-E3-18 meets industry standards.
7.What is the process for return or replacement of SMF43A-E3-18?
All SMF43A-E3-18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF43A-E3-18, 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-E3-18 part is unused and in its original packaging.
Return procedure for SMF43A-E3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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