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Vishay General Semiconductor - Diodes Division SMF40A-M3-08
- Part No.:
- SMF40A-M3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF40A-M3-08.pdf
- Description:
- TVS DIODE 40VWM 64.5VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:4,002
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Product details
Overview
SMF40A-M3-08 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 and power rails. It features a 40 V standoff voltage (VRWM), 44.4–49.1 V reverse breakdown (VBR), 64.5 V maximum clamping voltage at 3.1 A peak pulse current (IPPM), and 200 W peak pulse power (10/1000 μs). It is used in automotive infotainment interfaces to protect USB 2.0 and CAN FD signal paths from electrostatic discharge.
For engineers reviewing the SMF40A-M3-08 datasheet, SMF40A-M3-08 pinout, SMF40A-M3-08 application, or SMF40A-M3-08 equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, SOD-123W-compatible packaging, IEC 61000-4-2 ±30 kV contact/air ESD immunity, and real-world clamping behavior under surge conditions - all critical for robust interface protection design.
Technical Context
The SMF40A-M3-08 operates as a single-channel unidirectional TVS diode with avalanche breakdown clamping action. Its low incremental surge resistance ensures rapid voltage limiting during transients, while its "Low Noise" technology enables sub-nanosecond response time (<1 ns rise time per IEC 61000-4-2).
It is rated for continuous operation from –65 °C to +175 °C, supports wave and reflow soldering (peak 260 °C), and meets AEC-Q101 stress test requirements including HBM >8 kV. The device exhibits 172 pF typical junction capacitance at 0 V bias and 0.1 μA maximum reverse leakage at VRWM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 40 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for safe signal rail operation. |
| Breakdown Voltage (VBR) | 44.4–49.1 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering above normal system voltage. |
| Clamping Voltage (VC) | 64.5 V at 3.1 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge; defines protection margin. |
| Peak Pulse Power | 200 W (10/1000 μs) - Sustained energy-handling capability for common lightning/surge waveforms in industrial and automotive environments. |
| Junction Capacitance | 172 pF at 0 V, 1 MHz - Low enough for USB 2.0 (480 Mbps) and CAN FD (5 Mbps) without signal integrity degradation. |
| ESD Immunity | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - Full compliance with Level 4 ESD protection standard for end-equipment certification. |
| AEC-Q101 Qualified | Yes - Validated for automotive applications including temperature cycling, humidity bias, and mechanical shock per AEC stress test plan. |
Pinout & Package
SMF40A-M3-08 uses the DO-219AB (SMF) package - a low-profile, surface-mount case compatible with SOD-123W footprint. Dimensions: 3.9 mm × 1.9 mm × 1.08 mm (L × W × H), cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to signal or power line requiring protection; referenced to ground via cathode path during clamping. |
| Cathode | Ground reference | Connected to system ground plane; provides low-impedance return path for surge current during ESD events. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables robust protection against repetitive surges in 12 V automotive power domains without thermal runaway. |
| ±30 kV IEC 61000-4-2 ESD rating | Meets highest industrial and automotive ESD immunity class, eliminating need for secondary protection layers. |
| 172 pF junction capacitance | Preserves signal edge rate and eye diagram integrity on 480 Mbps USB 2.0 differential pairs. |
| AEC-Q101 qualified | Validated for under-hood and infotainment module deployment with guaranteed reliability over full automotive temperature range. |
| DO-219AB (SMF) package | Compatible with standard SOD-123W pick-and-place and reflow profiles, enabling drop-in replacement in existing layouts. |
Applications
| Automotive USB 2.0 Interface | CAN FD Data Line Protection |
|---|---|
|
Use Scenario: Protecting USB 2.0 D+/D− lines in vehicle head units exposed to human-body ESD during connector insertion. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between signal line and chassis ground to clamp transients before reaching USB transceiver IC. Use Value: 172 pF capacitance avoids signal distortion at 480 Mbps; 64.5 V clamping prevents damage to 3.3 V tolerant PHY inputs. |
Use Scenario: Safeguarding CAN FD bus lines (up to 5 Mbps) in ADAS domain controllers against ESD from cable harness handling. IC Role / Device Role / Timing Role: Standoff-rated TVS placed across CANH/CANL differential pair to suppress common-mode surges without affecting bus biasing. Use Value: 40 V VRWM aligns with CAN FD common-mode voltage range; ±30 kV ESD rating exceeds ISO 10605 requirements. |
| Industrial Ethernet PHY Port | 12 V Power Rail Surge Suppression |
|
Use Scenario: Shielding 10/100BASE-TX Ethernet magnetics interface on programmable logic controller (PLC) I/O modules. IC Role / Device Role / Timing Role: Low-capacitance TVS on MDI lines to absorb fast-rising ESD pulses without loading transformer-coupled signals. Use Value: Sub-1 ns response time ensures clamping occurs before PHY input latch-up; 200 W rating handles multiple ESD strikes. |
Use Scenario: Protecting 12 V supply inputs of telematics control units (TCUs) from load-dump and jump-start transients. IC Role / Device Role / Timing Role: Primary clamping device on main power rail, coordinated with upstream fuse and downstream DC/DC converter. Use Value: 64.5 V VC limits downstream voltage excursion below 65 V absolute max rating of most 12 V-rated regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A-E3/57T | Higher clamping voltage (69.4 V), larger SMA package (4.5 mm × 2.7 mm), 400 W peak power (10/1000 μs) | Better suited for higher-energy surges but adds 2.6× board area and 2.5× junction capacitance (423 pF) | Select when surge energy exceeds 200 W and layout space permits larger footprint. |
| TPD2E001DRYR | 2-channel, 15 pF, 5.5 V VRWM, not AEC-Q101 qualified, 120 W peak power | Targeted at low-voltage digital I/O (e.g., GPIO, I²C); unsuitable for 12 V power or CAN FD due to low VRWM | Choose only for sub-6 V logic-level protection where ultra-low capacitance is mandatory and automotive qualification is not required. |
Compared with SMAJ40A-E3/57T and TPD2E001DRYR, the SMF40A-M3-08 uniquely balances AEC-Q101 qualification, compact DO-219AB size, 172 pF capacitance, and 40 V standoff - making it optimal for space-constrained, automotive-grade USB and CAN FD protection where both reliability and signal fidelity are critical.
Availability
SMF40A-M3-08 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial CAN FD networks, USB 2.0 peripheral interfaces, and 12 V power rail protection requiring stable component supply across multi-year production cycles.
Supply support for SMF40A-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 high-speed interface protection with AEC-Q101 qualification, low capacitance, and precise clamping - engineered specifically for next-generation automotive data buses and ruggedized industrial connectivity.
FAQ
What is the clamping voltage of the SMF40A-M3-08 at its rated peak pulse current?
The SMF40A-M3-08 has a maximum clamping voltage (VC) of 64.5 V when subjected to a 3.1 A peak pulse current with a 10/1000 μs waveform. This value is measured under standardized surge conditions and defines the upper voltage limit imposed on protected circuitry during transient events. The SMF40A-M3-08 maintains this clamping performance across its full operating temperature range of –65 °C to +175 °C.
Is the SMF40A-M3-08 qualified to AEC-Q101 for automotive use?
Yes, the SMF40A-M3-08 is AEC-Q101 qualified, having passed all stress tests including high-temperature operating life, temperature cycling, and human-body model ESD (>8 kV). This qualification confirms its suitability for automotive applications such as infotainment, body control modules, and ADAS subsystems. The SMF40A-M3-08 carries full traceability and lot-level documentation required for Tier 1 automotive supply chains.
What is the junction capacitance of the SMF40A-M3-08 and how does it affect high-speed signal lines?
The SMF40A-M3-08 exhibits 172 pF typical junction capacitance at 0 V bias and 1 MHz. This value is low enough to avoid measurable signal degradation on USB 2.0 (480 Mbps) and CAN FD (5 Mbps) lines while maintaining effective ESD suppression. The SMF40A-M3-08's capacitance remains stable across reverse bias voltages up to VRWM, ensuring consistent signal integrity during normal operation.
Can the SMF40A-M3-08 be used in bidirectional signal protection applications?
No - the SMF40A-M3-08 is a unidirectional TVS diode, optimized for clamping positive transients on grounded-line configurations. For bidirectional protection (e.g., RS-485, HDMI), a symmetric device like the SMBJ40CA-M3/57T would be required. The SMF40A-M3-08 must be oriented with cathode toward ground; reverse installation will not provide protection and may cause failure under surge conditions.
What package type does the SMF40A-M3-08 use and is it compatible with automated assembly?
The SMF40A-M3-08 uses the DO-219AB (SMF) package - a low-profile, surface-mount outline measuring 3.9 mm × 1.9 mm × 1.08 mm. It is fully compatible with standard wave and reflow soldering processes, including peak temperatures up to 260 °C per J-STD-020. The SMF40A-M3-08's SOD-123W-compatible footprint allows direct placement using industry-standard pick-and-place equipment without tooling changes.
SMF40A-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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 3.1A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 172pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF40A-M3-08 FAQ
1.How can I place an order for SMF40A-M3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF40A-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 SMF40A-M3-08 reliable?
The price and inventory of SMF40A-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 SMF40A-M3-08 is usually 5 days.
3.What payment methods are accepted for SMF40A-M3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF40A-M3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF40A-M3-08?
SMF40A-M3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF40A-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 SMF40A-M3-08?
For technical support, including SMF40A-M3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF40A-M3-08 requirements.
6.How does Aetrix verify that SMF40A-M3-08 is sourced from the original manufacturer or authorized distributors?
All SMF40A-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 SMF40A-M3-08 meets industry standards.
7.What is the process for return or replacement of SMF40A-M3-08?
All SMF40A-M3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF40A-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 SMF40A-M3-08 part is unused and in its original packaging.
Return procedure for SMF40A-M3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF40A-M3-08 Tags
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