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Vishay General Semiconductor - Diodes Division SMF43A-M3-08
- Part No.:
- SMF43A-M3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF43A-M3-08.pdf
- Description:
- TVS DIODE 43VWM 69.4VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:7,862
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Product details
Overview
SMF43A-M3-08 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for transient voltage suppression on signal and power lines. It features a 43 V stand-off voltage (VRWM), 69.4 V maximum clamping voltage at 2.9 A peak pulse current (10/1000 μs), 165 pF typical junction capacitance at 0 V, ±30 kV IEC 61000-4-2 ESD immunity, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SMF43A-M3-08 datasheet, SMF43A-M3-08 pinout, SMF43A-M3-08 application, or SMF43A-M3-08 equivalent, this device is selected for high-reliability board-level ESD protection where low clamping voltage, fast response time, and robust surge handling (200 W, 10/1000 μs) are required in space-constrained layouts.
Technical Context
This diode operates as a unidirectional TVS device with avalanche breakdown behavior, triggered when reverse voltage exceeds its 47.8–52.9 V breakdown range (VBR). Its low incremental surge resistance enables tight clamping during transients, minimizing voltage overshoot across protected ICs.
The SMF43A-M3-08 uses "Low Noise" silicon technology for sub-nanosecond response to ESD events and is optimized for wave and reflow soldering per J-STD-020 MSL level 1 conditions (peak 260 °C). It supports operation from –65 °C to +175 °C and meets AEC-Q101 stress test requirements including H3B-class human body model (>8 kV).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 43 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin below clamping threshold. |
| Breakdown Voltage (VBR) | 47.8–52.9 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during overvoltage events. |
| Clamping Voltage (VC) | 69.4 V at IPPM = 2.9 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge; critical for IC input stage safety. |
| Junction Capacitance (CD) | 165 pF at 0 V, 1 MHz - Low enough for USB 2.0 and CAN FD signal integrity; limits high-frequency loading on data lines. |
| ESD Immunity | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - Full compliance with industrial and automotive ESD immunity standards. |
| Peak Pulse Power | 200 W (10/1000 μs), 1000 W (8/20 μs) - Sustains high-energy surges without degradation; validated per IEC 61000-4-5. |
| Operating Temperature | –65 °C to +175 °C - Enables deployment in under-hood automotive, industrial motor control, and outdoor power electronics. |
Pinout & Package
SMF43A-M3-08 is housed in the DO-219AB (SOD-123W-compatible) surface-mount package: 3.9 mm × 1.9 mm × 1.08 mm, low-profile, cathode-bar marked, MSL level 1, wave/reflow solderable. Weight: 15 mg.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current path / low-impedance return during clamping | Connected to ground or low-impedance reference plane; completes transient current path during ESD event. |
| Cathode | Protected line connection / high-impedance input side | Connected to I/O line (e.g., CAN_H, USB_D+, sensor output); blocks normal operation current but conducts during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables reliable protection against repetitive lightning-induced surges in industrial fieldbus nodes without thermal runaway. |
| ±30 kV IEC 61000-4-2 ESD rating | Meets highest-tier system-level ESD immunity requirements for automotive infotainment and ADAS interface ports. |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing. |
| 165 pF junction capacitance | Preserves signal rise/fall times on 125 kbps–1 Mbps CAN and RS-485 buses without distortion or timing jitter. |
| Low-profile DO-219AB package | Reduces PCB footprint vs. SMA/SMB; compatible with automated placement and high-density routing in compact ECUs. |
Applications
| Automotive CAN Bus Protection | Industrial RS-485 Interface |
|---|---|
|
Use Scenario: Protecting CAN_H/CAN_L lines in engine control units against ESD and load dump transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between each bus line and chassis ground. Use Value: Clamps transients to ≤69.4 V while maintaining <165 pF loading-ensuring CAN bit timing integrity and preventing PHY latch-up. |
Use Scenario: Safeguarding RS-485 transceivers in factory automation PLCs exposed to cable discharge events. IC Role / Device Role / Timing Role: Line-to-ground transient suppressor on differential pair inputs. Use Value: Withstands ±30 kV contact ESD without parameter shift, preserving common-mode rejection and data throughput up to 10 Mbps. |
| USB 2.0 Data Line Protection | Automotive Sensor Signal Conditioning |
|
Use Scenario: ESD hardening of D+ and D− lines in USB-powered vehicle diagnostic tools. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional diode (cathode to signal, anode to ground) per line. Use Value: 165 pF capacitance avoids USB 2.0 eye diagram closure; 69.4 V clamping prevents damage to USB PHY's 3.3 V I/O cells. |
Use Scenario: Protecting analog outputs of pressure/temperature sensors in exhaust gas recirculation systems. IC Role / Device Role / Timing Role: Stand-off protection on 0–5 V ratiometric output lines routed through harsh under-hood environments. Use Value: 43 V VRWM provides >2× margin over 12 V supply rails; –65 °C to +175 °C rating matches sensor operating envelope. |
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 | DO-214AC (SMA) package; 4.5 mm × 2.7 mm × 2.2 mm; 1000 W (8/20 μs) but only 100 W (10/1000 μs); 70.1 V VC at 3.2 A. | Larger footprint and higher thermal resistance (RthJA = 40 K/W vs. 180 K/W); less suitable for ultra-thin modules or high-density layouts. | Choose SMAJ43A-E3/57T only if legacy board space allows larger package and higher clamping voltage is acceptable. |
| TPSMF43A | Same DO-219AB package; identical VRWM (43 V) and VBR (47.8–52.9 V); slightly lower VC (68.5 V at 2.9 A); 150 pF CD. | Optimized for lower capacitance and tighter clamping-preferred for high-speed CAN FD (5 Mbps) or LIN bus with strict timing budgets. | Prefer TPSMF43A when upgrading for enhanced signal fidelity or margin-critical designs requiring sub-69 V clamping. |
Compared with SMF43A-M3-08, SMAJ43A-E3/57T trades board space for higher 8/20 μs surge capacity but sacrifices 10/1000 μs performance and thermal efficiency, while TPSMF43A delivers measurable improvements in clamping voltage and capacitance-making it a functional upgrade rather than just a drop-in alternative.
Availability
SMF43A-M3-08 is available at Aetrix Electronics and suitable for automotive ECU design, industrial fieldbus node development, and USB peripheral hardening requiring stable component supply and long-term lifecycle assurance.
Supply support for SMF43A-M3-08 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, specializing in high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SMF series targets board-level ESD and surge protection in space-constrained, high-temperature environments-designed specifically for AEC-Q101 compliance and seamless integration into automotive signal chains and industrial communication interfaces.
FAQ
What is the clamping voltage of the SMF43A-M3-08 under standard surge conditions?
The SMF43A-M3-08 has a maximum clamping voltage (VC) of 69.4 V when subjected to a 2.9 A peak pulse current with a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 and ensures downstream ICs see limited overvoltage during transient events. The SMF43A-M3-08 maintains this clamping performance across its full operating temperature range.
Is the SMF43A-M3-08 qualified for automotive applications?
Yes, the SMF43A-M3-08 is AEC-Q101 qualified and rated for operation from –65 °C to +175 °C. It passes human body model (HBM) Class H3B (>8 kV), machine model (MM), and ESD immunity tests per IEC 61000-4-2 (±30 kV contact/air). These qualifications make the SMF43A-M3-08 suitable for under-hood and cabin ECU designs.
What package type does the SMF43A-M3-08 use, and is it compatible with automated assembly?
The SMF43A-M3-08 uses the DO-219AB (SOD-123W-compatible) surface-mount package: 3.9 mm × 1.9 mm × 1.08 mm, with cathode bar marking. It is fully compatible with wave and reflow soldering per J-STD-020 MSL level 1 (peak 260 °C), and supports high-speed pick-and-place assembly with standard SOD-123 footprints.
How does the junction capacitance of the SMF43A-M3-08 affect high-speed data lines?
The SMF43A-M3-08 exhibits 165 pF typical junction capacitance at 0 V and 1 MHz, which is low enough to avoid signal integrity issues on 125 kbps–1 Mbps buses like standard CAN and RS-485. For higher-speed protocols such as CAN FD (5 Mbps), designers should verify eye diagram margins-but the SMF43A-M3-08 remains viable in most non-critical data paths.
What is the standoff voltage rating of the SMF43A-M3-08, and how does it relate to system voltage?
The SMF43A-M3-08 has a maximum working standoff voltage (VRWM) of 43 V, meaning it remains non-conductive up to that DC or RMS voltage. This provides ≥2× margin over nominal 12 V or 24 V automotive systems and aligns with ISO 7637-2 pulse 1/2b immunity requirements. The SMF43A-M3-08 will not interfere with normal operation of 42 V-rated circuits.
SMF43A-M3-08 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:
- 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-M3-08 FAQ
1.How can I place an order for SMF43A-M3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF43A-M3-08 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-M3-08 reliable?
The price and inventory of SMF43A-M3-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF43A-M3-08 is usually 5 days.
3.What payment methods are accepted for SMF43A-M3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF43A-M3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF43A-M3-08?
SMF43A-M3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF43A-M3-08 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-M3-08?
For technical support, including SMF43A-M3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF43A-M3-08 requirements.
6.How does Aetrix verify that SMF43A-M3-08 is sourced from the original manufacturer or authorized distributors?
All SMF43A-M3-08 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-M3-08 meets industry standards.
7.What is the process for return or replacement of SMF43A-M3-08?
All SMF43A-M3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF43A-M3-08, 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-M3-08 part is unused and in its original packaging.
Return procedure for SMF43A-M3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF43A-M3-08 Tags
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