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Vishay General Semiconductor - Diodes Division SMC3K40CA-M3/57
- Part No.:
- SMC3K40CA-M3/57
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K40CA-M3/57.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:221
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Product details
Overview
SMC3K40CA-M3/57 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, rated for 3000 W peak pulse power (10/1000 μs), 40 V stand-off voltage (VWM), 44.4–49.1 V breakdown voltage (VBR), and 46.5 A peak pulse current (IPPM), used to protect MOSFETs, ICs, and sensor signal lines against inductive switching transients in automotive and industrial systems.
For engineers reviewing the SMC3K40CA-M3/57 datasheet, SMC3K40CA-M3/57 pinout, SMC3K40CA-M3/57 application, or SMC3K40CA-M3/57 equivalent, key selection criteria include clamping voltage (64.5 V at IPPM), bidirectional polarity, AEC-Q101 qualification status, M3 halogen-free RoHS-compliant construction, and compatibility with wave-soldering restrictions on PCB bottom side mounting.
Technical Context
This TVS diode operates as a voltage-clamped surge protection device, responding within picoseconds to transient overvoltages and limiting reverse voltage across protected circuit nodes to ≤64.5 V during 46.5 A surges. Its bidirectional architecture enables symmetric clamping for AC-coupled or floating signal paths without polarity dependency.
Designed for high-energy transients, it delivers 3000 W peak pulse power per 10/1000 μs waveform, with thermal derating above 25 °C ambient and maximum junction temperature of 150 °C. It meets J-STD-020 MSL Level 1 and UL 497B safety certification (E136766), supporting automotive-grade reliability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe working range for protected line. |
| VBR min/max | 44.4 V / 49.1 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on threshold. |
| VC @ IPPM | 64.5 V - Clamped voltage during 46.5 A surge; determines worst-case overvoltage seen by downstream components. |
| PPPM | 3000 W - Peak pulse power handling capability under standardized 10/1000 μs waveform; quantifies transient energy absorption. |
| Package | SMC (DO-214AB) - Industry-standard surface-mount outline with 8.0 mm × 8.0 mm copper pad area recommendation for thermal management. |
| Polarity | Bidirectional - Provides symmetrical clamping for AC signals or ungrounded interfaces without orientation sensitivity. |
| TJ max | 150 °C - Maximum allowable junction temperature; sets thermal design limits for board layout and power cycling. |
Pinout & Package
SMC3K40CA-M3/57 uses the standard SMC (DO-214AB) package: molded plastic body with two coplanar matte tin-plated leads, compliant with J-STD-002 and JESD 22-B102 solderability standards. No polarity marking on bidirectional variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Anode) | Transient conduction path (bidirectional) | Both terminals function identically; no fixed cathode/anode designation-surge current flows symmetrically in either direction. |
| Anode (Cathode) | Transient conduction path (bidirectional) | Identical role to opposite terminal; enables placement flexibility on PCB without orientation constraints. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics use, including engine control units and ADAS sensor interfaces requiring extended temperature and reliability compliance. |
| 3000 W peak pulse power | Supports robust protection against high-energy transients such as ISO 7637-2 Pulse 5a (load dump) in 12 V vehicle systems. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns response), improving clamping fidelity for sensitive analog front-ends. |
| MSL Level 1 moisture sensitivity | Enables standard reflow assembly without dry-pack or baking requirements, reducing manufacturing complexity and cost. |
| UL 497B recognition (E136766) | Confirms compliance with safety standards for telecom and industrial equipment requiring certified surge protection components. |
Applications
| Automotive Power Line Protection | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins from load dump and alternator ripple in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between signal line and ground, absorbing >3000 W surges without failure. Use Value: Maintains signal integrity below 64.5 V clamp level during ISO 7637-2 Pulse 5a events, preventing latch-up or permanent damage to 5 V logic interfaces. |
Use Scenario: Shielding 4–20 mA current loop inputs in PLC analog modules from ESD and field wiring transients. IC Role / Device Role / Timing Role: Standoff voltage (40 V) exceeds loop compliance range while clamping fast spikes before they reach precision op-amps. Use Value: Enables reliable operation in harsh factory environments where cable-induced surges exceed 1 kV, with <2.0 μA leakage at VWM preserving measurement accuracy. |
| Telecom Interface Surge Protection | Consumer Device USB Port ESD Guard |
Use Scenario: Safeguarding Ethernet PHY magnetics and PoE injectors against lightning-induced surges on outdoor data links. IC Role / Device Role / Timing Role: Primary shunt protector on secondary-side DC lines, coordinated with upstream GDTs for staged suppression. Use Value: Withstands repeated 10/1000 μs surges up to 46.5 A while maintaining <64.5 V clamping, meeting ITU-T K.21 basic protection requirements. |
Use Scenario: Adding secondary-level surge immunity to USB 2.0 D+/D− lines in smart home hubs exposed to user-handling ESD. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed adjacent to connector, suppressing ±15 kV contact discharge per IEC 61000-4-2. Use Value: Delivers sub-nanosecond response and <1.0 mA leakage at 40 V, ensuring no signal degradation on 480 Mbps differential data paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMC3K40CAHM3/57 | AEC-Q101 qualified version with identical electrical specs; HM3 suffix denotes automotive qualification and same M3 halogen-free RoHS construction. | Required for new automotive designs where AEC-Q101 compliance is mandatory; not necessary for commercial-grade applications. | Select SMC3K40CAHM3/57 when automotive qualification documentation and traceability are contractually required. |
| SMC3K43CA-M3/57 | Higher VWM (43 V) and VBR (47.8–52.8 V); clamping voltage 69.4 V at 43.2 A IPPM - trades higher standoff for reduced surge current capacity. | Better suited for 48 V systems or circuits needing tighter margin above nominal rail voltage before clamping begins. | Choose SMC3K43CA-M3/57 if system nominal voltage exceeds 40 V and clamping headroom above 64.5 V is acceptable. |
Compared with SMC3K40CA-M3/57, SMC3K40CAHM3/57 adds formal automotive qualification without altering electrical behavior, while SMC3K43CA-M3/57 shifts the protection threshold upward to accommodate higher-voltage rails at the expense of lower surge current rating.
Availability
SMC3K40CA-M3/57 is available at Aetrix Electronics and suitable for automotive infotainment power rails, industrial PLC analog input protection, and telecom interface surge suppression requiring stable component supply and long-term production continuity.
Supply support for SMC3K40CA-M3/57 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 General Semiconductor is a global supplier of discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on high-reliability and automotive-grade performance.
The SMC3KxxCA series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-power transient suppression in demanding automotive, industrial, and telecom environments where robustness and repeatable clamping are critical.
FAQ
What is the clamping voltage of SMC3K40CA-M3/57 and how is it measured?
The SMC3K40CA-M3/57 has a maximum clamping voltage (VC) of 64.5 V, measured at its rated peak pulse current (IPPM) of 46.5 A using a standardized 10/1000 μs double-exponential waveform. This value represents the highest voltage that appears across the device terminals during a full-power transient event and is specified at TA = 25 °C with proper PCB thermal relief per datasheet recommendations.
Is SMC3K40CA-M3/57 suitable for automotive applications?
SMC3K40CA-M3/57 is halogen-free, RoHS-compliant, and meets J-STD-020 MSL Level 1, but it is not AEC-Q101 qualified. For automotive use, Vishay specifies the SMC3K40CAHM3/57 variant instead. The SMC3K40CA-M3/57 remains appropriate for non-automotive industrial or consumer applications where AEC-Q101 is not mandated.
What does the "-M3/57" suffix mean in SMC3K40CA-M3/57?
The "M3" suffix indicates halogen-free, RoHS-compliant construction with JESD 201 Class 2 whisker resistance, while "/57" denotes packaging in 7-inch diameter plastic tape and reel containing 850 units. This ordering code defines both material compliance and logistics format for automated SMT placement.
Can SMC3K40CA-M3/57 be used in bidirectional signal lines like RS-485 or CAN?
Yes, SMC3K40CA-M3/57 is inherently bidirectional and commonly applied to protect differential buses such as RS-485 and CAN. Its symmetrical clamping characteristic ensures equal protection on both signal lines relative to ground, and its 40 V VWM provides sufficient margin above typical 3.3 V or 5 V logic levels while remaining compatible with 12 V automotive CAN physical layers.
What is the maximum operating temperature for SMC3K40CA-M3/57?
The SMC3K40CA-M3/57 has a maximum junction temperature (TJ max) of +150 °C and an operating junction/storage temperature range of -55 °C to +150 °C. Derating of peak pulse power begins above TA = 25 °C per Figure 2 in the datasheet, requiring thermal design consideration for sustained high-temperature environments.
SMC3K40CA-M3/57 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 46.5A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMC3K40CA-M3/57 FAQ
1.How can I place an order for SMC3K40CA-M3/57 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K40CA-M3/57 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 SMC3K40CA-M3/57 reliable?
The price and inventory of SMC3K40CA-M3/57 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC3K40CA-M3/57 is usually 5 days.
3.What payment methods are accepted for SMC3K40CA-M3/57?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K40CA-M3/57 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K40CA-M3/57?
SMC3K40CA-M3/57 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K40CA-M3/57 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 SMC3K40CA-M3/57?
For technical support, including SMC3K40CA-M3/57 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K40CA-M3/57 requirements.
6.How does Aetrix verify that SMC3K40CA-M3/57 is sourced from the original manufacturer or authorized distributors?
All SMC3K40CA-M3/57 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 SMC3K40CA-M3/57 meets industry standards.
7.What is the process for return or replacement of SMC3K40CA-M3/57?
All SMC3K40CA-M3/57 units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K40CA-M3/57, 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 SMC3K40CA-M3/57 part is unused and in its original packaging.
Return procedure for SMC3K40CA-M3/57:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K40CA-M3/57 Tags
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