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Vishay General Semiconductor - Diodes Division VTVS40ASMF-M3-18
- Part No.:
- VTVS40ASMF-M3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
VTVS40ASMF-M3-18.pdf
- Description:
- TVS DIODE 39.6VWM 67VC DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,858
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Product details
Overview
VTVS40ASMF-M3-18 from Vishay Semiconductors is a unidirectional 400 W TransZorb® transient voltage suppressor diode in SMF (DO-219AB) package, designed for ESD and surge protection of low-voltage DC lines such as USB, HDMI, and automotive sensor interfaces. It features 39.6 V stand-off voltage (VRWM), 44.7–49.4 V reverse breakdown (VBR at IT = 1 mA), 67 A peak pulse current (IPPM, 10/1000 μs), 67 V maximum clamping voltage (VC), and 309 pF typical junction capacitance at 0 V.
For engineers reviewing the VTVS40ASMF-M3-18 datasheet, VTVS40ASMF-M3-18 pinout, VTVS40ASMF-M3-18 application, or VTVS40ASMF-M3-18 equivalent, key selection criteria include clamping performance under 10/1000 μs surges, ±5 % VBR tolerance, IEC 61000-4-2 ±30 kV ESD immunity, low-profile SOD-123W-compatible packaging, and operation up to +175 °C junction temperature.
Technical Context
This device operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its specified breakdown range (44.7–49.4 V), then clamping transients to ≤67 V at 67 A. Its low 309 pF capacitance minimizes signal distortion on high-speed data lines while maintaining robust 400 W peak pulse power handling per 10/1000 μs waveform.
Designed for surface-mount reflow and wave soldering, it meets MSL level 1 per J-STD-020, supports halogen-free and lead-free terminations, and achieves thermal resistance RthJL = 20 K/W when mounted on an infinite heat sink - enabling reliable operation in automotive and industrial environments with ambient temperatures from –55 °C to +175 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W (per 10/1000 μs waveform; defines maximum transient energy absorption capability) |
| Stand-off Voltage (VRWM) | 39.6 V (maximum continuous reverse operating voltage before significant leakage) |
| Breakdown Voltage (VBR) | 44.7–49.4 V at IT = 1 mA (avalanche initiation range; ±5 % tolerance) |
| Clamping Voltage (VC) | 67 V at IPPM = 67 A (maximum voltage seen by protected circuit during worst-case surge) |
| Junction Capacitance | 309 pF at VR = 0 V, f = 1 MHz (low enough for USB 2.0 and CAN FD signal integrity) |
| ESD Immunity | ±30 kV contact & air discharge per IEC 61000-4-2 (enables single-device ESD hardening without external RC filters) |
| Operating Temperature | –55 °C to +175 °C (supports under-hood automotive and industrial control applications) |
Pinout & Package
Package: SMF (DO-219AB), 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 | Current entry terminal during forward conduction | Connected to protected line's low-side reference (e.g., ground return path for unidirectional clamp) |
| Cathode | Current exit terminal during reverse avalanche | Connected to protected signal line; clamps voltage to VC when transient exceeds VRWM |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables protection against ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 Level 4 surges without derating |
| ±30 kV ESD immunity (IEC 61000-4-2) | Eliminates need for secondary ESD stages in USB, display, and sensor interface designs |
| 309 pF junction capacitance | Maintains signal rise/fall time integrity on 480 Mbps USB 2.0 and 5 Mbps CAN FD buses |
| Unidirectional polarity | Optimized for DC-biased lines where negative transients are not expected (e.g., power rails, sensor VCC) |
| AEC-Q101 qualified option available | Validated for automotive electronics per stress test requirements (not standard for -M3-18; see -HM3 variants) |
Applications
| Automotive Sensor Interface | USB 2.0 Data Line Protection |
|---|---|
Use Scenario: Protecting LIN/CAN sensor nodes (e.g., pressure, temperature) from load dump and ESD events in engine control modules. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between sensor signal line and ground, clamping transients before they reach MCU input pins. Use Value: Prevents latch-up and permanent damage to 3.3 V/5 V analog front-end ICs during ISO 16750-2 load dump tests (up to 120 V, 50 ms). |
Use Scenario: Safeguarding USB 2.0 D+/D− lines against ESD and hot-plug surges in docking stations and peripheral hubs. IC Role / Device Role / Timing Role: Low-capacitance TVS connected across differential pair, referenced to ground, with minimal impact on 480 Mbps eye diagram. Use Value: Maintains USB 2.0 compliance while delivering ±30 kV IEC 61000-4-2 protection without adding series impedance or signal delay. |
| Industrial PLC Digital Input | DC Power Rail Surge Suppression |
Use Scenario: Shielding 24 V digital input channels in programmable logic controllers from field-induced surges and lightning-induced coupling. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between input terminal and common rail, absorbing repetitive 10/1000 μs transients up to 400 W. Use Value: Extends mean time between failures (MTBF) by preventing cumulative degradation of optocoupler input stages during factory floor EMI exposure. |
Use Scenario: Clamping 12 V/24 V supply rails against switching transients from relay coils, motor drivers, and solenoids. IC Role / Device Role / Timing Role: Unidirectional TVS connected between rail and ground, triggered only during overvoltage events above 39.6 V. Use Value: Limits rail overshoot to ≤67 V, protecting downstream LDOs, microcontrollers, and communication ICs without crowbar action or shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A | Same VRWM (40 V), but higher VC = 64.5 V at IPPM = 64.5 A; SMA package (DO-214AC), larger footprint (4.5 mm × 2.7 mm) | Less suitable for space-constrained USB or automotive sensor PCBs due to 2.5× larger area and 0.2 mm greater height | Select when board layout allows larger SMC/SMA packages and lower clamping voltage is prioritized over capacitance |
| SMF40A | Identical VRWM (40 V), same SMF package, but VC = 69 V at IPPM = 64 A; 320 pF capacitance; ±5 % VBR tolerance | Marginally higher clamping and capacitance reduce margin for high-speed data lines like USB 2.0 | Prefer for cost-sensitive industrial controls where 309 pF vs. 320 pF has negligible effect and tighter VC spec is not required |
Compared with VTVS40ASMF-M3-18, SMAJ40A offers slightly lower clamping but requires more PCB area and lacks the optimized 309 pF capacitance for data lines; SMF40A matches the package but trades off 2 V higher clamping and 11 pF higher capacitance, reducing noise margin in high-frequency applications.
Availability
VTVS40ASMF-M3-18 is available at Aetrix Electronics and suitable for automotive sensor interfaces, USB 2.0 data line protection, and industrial PLC digital inputs requiring stable component supply, RoHS-compliant lead-free terminations, and halogen-free molding compound.
Supply support for VTVS40ASMF-M3-18 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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The VTVS eSMP® Series targets compact, high-power transient suppression in space-constrained applications, with emphasis on AEC-Q101 qualification, low capacitance, and compatibility with modern SMT assembly processes.
FAQ
What is the maximum clamping voltage of the VTVS40ASMF-M3-18 under rated surge conditions?
The VTVS40ASMF-M3-18 exhibits a maximum reverse clamping voltage (VC) of 67 V when subjected to its rated 67 A peak pulse current (IPPM) using the standard 10/1000 μs waveform. This value is measured at the device terminals and represents the highest voltage imposed on the protected circuit during worst-case transient events, ensuring downstream ICs rated for ≤67 V withstand stress without damage.
Is the VTVS40ASMF-M3-18 suitable for protecting USB 2.0 differential pairs?
Yes, the VTVS40ASMF-M3-18 is suitable for USB 2.0 data line protection due to its 309 pF junction capacitance at 0 V, which introduces negligible loading on 480 Mbps signals, and its unidirectional configuration that avoids forward conduction during normal bus signaling. Its 39.6 V VRWM ensures no leakage during 5 V VBUS operation, and ±30 kV ESD rating meets IEC 61000-4-2 requirements without additional filtering.
Does the VTVS40ASMF-M3-18 meet AEC-Q101 qualification?
The VTVS40ASMF-M3-18 itself is not AEC-Q101 qualified; however, Vishay offers AEC-Q101 qualified versions in the same family under part numbers such as VTVS40AHM3-18 (with "H" denoting AEC-Q101). The -M3-18 suffix indicates RoHS-compliant, lead-free, halogen-free construction in 3 k per 7″ reel packaging, but does not imply automotive qualification.
What is the thermal resistance and maximum junction temperature of the VTVS40ASMF-M3-18?
The VTVS40ASMF-M3-18 has a thermal resistance RthJL of 20 K/W when mounted on an infinite heat sink, and its maximum junction temperature (TJ) is rated at +175 °C. This enables reliable operation in under-hood automotive environments and industrial enclosures where ambient temperatures exceed 125 °C, provided PCB copper area and airflow meet minimum thermal design guidelines per Vishay's application notes.
How does the VTVS40ASMF-M3-18 compare to bidirectional TVS diodes in surge protection?
The VTVS40ASMF-M3-18 is unidirectional and optimized for DC-biased lines where negative transients are absent or clamped separately. Unlike bidirectional devices, it avoids leakage current during normal positive bias and delivers lower capacitance (309 pF vs. typically >400 pF for bidirectional equivalents), making it preferable for 5 V power rails and single-ended data lines. Bidirectional variants would be required only for AC-coupled or floating-signal applications.
VTVS40ASMF-M3-18 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-219AB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 39.6V
- Voltage - Breakdown (Min):
- 44.7V
- Voltage - Clamping (Max) @ Ipp:
- 67V
- Current - Peak Pulse (10/1000µs):
- 5.7A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 309pF @ 1MHz
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
VTVS40ASMF-M3-18 FAQ
1.How can I place an order for VTVS40ASMF-M3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for VTVS40ASMF-M3-18 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 VTVS40ASMF-M3-18 reliable?
The price and inventory of VTVS40ASMF-M3-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VTVS40ASMF-M3-18 is usually 5 days.
3.What payment methods are accepted for VTVS40ASMF-M3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VTVS40ASMF-M3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VTVS40ASMF-M3-18?
VTVS40ASMF-M3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VTVS40ASMF-M3-18 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 VTVS40ASMF-M3-18?
For technical support, including VTVS40ASMF-M3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VTVS40ASMF-M3-18 requirements.
6.How does Aetrix verify that VTVS40ASMF-M3-18 is sourced from the original manufacturer or authorized distributors?
All VTVS40ASMF-M3-18 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 VTVS40ASMF-M3-18 meets industry standards.
7.What is the process for return or replacement of VTVS40ASMF-M3-18?
All VTVS40ASMF-M3-18 units undergo pre-shipment inspection (PSI). If there is an issue with VTVS40ASMF-M3-18, 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 VTVS40ASMF-M3-18 part is unused and in its original packaging.
Return procedure for VTVS40ASMF-M3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
VTVS40ASMF-M3-18 Tags
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