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Vishay General Semiconductor - Diodes Division SMC5K40CA-M3/I
- Part No.:
- SMC5K40CA-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC5K40CA-M3/I.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMC5K40CA-M3/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection. It features 40 V standoff voltage (VWM), 44.4–49.1 V breakdown voltage (VBR), 64.5 V clamping voltage at 77.5 A (10/1000 μs), 5000 W peak pulse power, and AEC-Q101 qualification - deployed to protect MOSFETs and signal lines in automotive powertrain control units.
For engineers reviewing the SMC5K40CA-M3/I datasheet, SMC5K40CA-M3/I pinout, SMC5K40CA-M3/I application, or SMC5K40CA-M3/I equivalent, key selection criteria include clamping performance under 10/1000 μs transients, thermal resistance (RthJA = 90 °C/W), bidirectional polarity, MSL Level 1 moisture sensitivity, and halogen-free RoHS-compliant construction.
Technical Context
This TVS operates as a voltage-clamping device triggered by reverse-biased avalanche breakdown, with no cathode band due to its bidirectional structure. Its junction capacitance is not specified at 1 MHz for this variant, but it meets IEC 61000-4-2 ESD immunity up to 30 kV (contact/air mode).
Thermal design relies on RthJM = 4.0 °C/W (junction-to-mount) and RthJA = 90 °C/W (junction-to-ambient on FR4), enabling reliable operation from –55 °C to +175 °C. The device is rated for non-repetitive 10/1000 μs surges up to 5000 W and 8/20 μs surges up to 40 kW.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal line bias margin. |
| VBR min/max | 44.4 V / 49.1 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 64.5 V at 77.5 A (10/1000 μs) - Clamping voltage during standard surge event; determines protected IC's maximum transient stress. |
| PPPM | 5000 W (10/1000 μs) - Peak surge energy handling capacity; validates suitability for automotive load-dump and inductive switching events. |
| TJ max | +175 °C - Maximum junction temperature; supports under-hood automotive environments without derating below 125 °C ambient. |
| Polarity | Bidirectional - Enables symmetrical clamping on AC-coupled or differential signal lines without polarity orientation constraints. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 0.320" x 0.246" footprint; compatible with automated pick-and-place and reflow. |
Pinout & Package
SMC (DO-214AB) package: molded epoxy case with matte tin-plated leads, MSL Level 1, J-STD-002 solderable, JESD 201 Class 2 whisker resistant. Bidirectional construction eliminates cathode marking; both terminals are electrically symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Either terminal serves as current entry point during positive or negative transients; no PCB polarity assignment required. |
| Cathode/Anode (symmetrical) | Transient conduction path | Completes low-impedance clamp loop during opposite-polarity surge; enables full-cycle protection without external diode pairing. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive powertrain and chassis applications per stress test requirements including HTOL, TCT, and ESD. |
| 5000 W peak pulse power (10/1000 μs) | Withstands ISO 7637-2 Pulse 5a load-dump surges in 12 V systems without degradation or failure. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., relay coil flyback), improving protection margin for downstream ICs. |
| UL 497B recognized (E136766) | Meets safety standards for telecom and industrial interface protection, supporting regulatory compliance in end equipment. |
| Halogen-free, RoHS-compliant (M3 suffix) | Complies with environmental directives and enables use in green manufacturing without material declaration exceptions. |
Applications
| Automotive Powertrain Control | Industrial Sensor Signal Lines |
|---|---|
Use Scenario: Protecting microcontroller GPIO and CAN transceiver pins from alternator load-dump and solenoid switching transients in engine control modules. IC Role / Device Role / Timing Role: Voltage-clamping transient suppressor placed directly at connector entry or IC input pins. Use Value: Limits transient voltage to ≤64.5 V during 77.5 A surges, preventing latch-up or gate oxide damage in 3.3 V/5 V logic interfaces. |
Use Scenario: Shielding 4–20 mA analog sensor outputs and RS-485 bus lines from EFT bursts and lightning-induced surges in factory automation PLCs. IC Role / Device Role / Timing Role: Fast-response shunt protector with sub-nanosecond response time, placed before signal conditioning circuitry. Use Value: Maintains signal integrity by clamping transients within 100 ns while sustaining 30 kV HBM ESD immunity per IEC 61000-4-2. |
| Telecom Interface Protection | Consumer Power Adapter Inputs |
Use Scenario: Safeguarding Ethernet PHY magnetics and PoE controller inputs against induced surges on outdoor telecom line cards. IC Role / Device Role / Timing Role: Primary-level surge suppression on DC input rails and data line pairs. Use Value: Handles 40 kW (8/20 μs) surges per UL 497B, meeting Telcordia GR-1089-CORE Level 3 requirements. |
Use Scenario: Suppressing switch-mode power supply turn-on spikes and external line surges in USB-C PD adapters and AC/DC wall adapters. IC Role / Device Role / Timing Role: Input-stage TVS on primary-side rectifier output or secondary-side 5 V/9 V rails. Use Value: Withstands repetitive 5000 W pulses without parameter drift, ensuring long-term reliability in cost-sensitive consumer power designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40CA-E3/5A (Vishay) | Lower PPPM (400 W), SMA package (smaller footprint), same VWM/VBR range, non-AEC-Q101. | Targeted at space-constrained consumer electronics where automotive qualification is unnecessary. | Select when board area is critical and surge energy demand is ≤400 W; not suitable for automotive under-hood use. |
| 1.5KE40CA (ON Semiconductor) | Higher RthJA (~100 °C/W), axial DO-201 package, same VWM/VBR, 5000 W rating, non-AEC-Q101, UL 497B certified. | Used in legacy industrial power supplies where through-hole assembly remains standard. | Choose for through-hole compatibility or existing DO-201 footprints; lacks automotive qualification and SMC thermal performance. |
Compared with SMC5K40CA-M3/I, SMAJ40CA-E3/5A offers smaller size but sacrifices 92% peak power handling and automotive qualification, while 1.5KE40CA retains equivalent surge rating but requires through-hole layout and delivers inferior thermal management in SMT designs.
Availability
SMC5K40CA-M3/I is available at Aetrix Electronics and suitable for automotive powertrain control, industrial sensor interfacing, and telecom surge protection requiring stable component supply, consistent M3-grade halogen-free compliance, and AEC-Q101 validation.
Supply support for SMC5K40CA-M3/I 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 leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, automotive qualification, and industrial robustness.
The SMC5KxxCA family is engineered specifically for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where clamping precision, surge endurance, and long-term stability are mandatory.
FAQ
What is the clamping voltage of SMC5K40CA-M3/I at its rated peak pulse current?
The SMC5K40CA-M3/I has a maximum clamping voltage (VC) of 64.5 V at 77.5 A peak pulse current under the standard 10/1000 μs waveform. This value is measured per Fig.3 in the Vishay datasheet 87024 and defines the upper voltage limit imposed on protected circuits during surge events. The SMC5K40CA-M3/I maintains this clamping performance across its full operating temperature range.
Is SMC5K40CA-M3/I qualified for automotive applications?
Yes, the SMC5K40CA-M3/I is AEC-Q101 qualified, as explicitly stated in the Vishay datasheet revision 10-Sep-2024 (Document Number: 87024). This qualification covers stress tests including high-temperature operating life, temperature cycling, and ESD, making the SMC5K40CA-M3/I suitable for automotive powertrain, body electronics, and chassis systems.
What does the "M3" suffix indicate in SMC5K40CA-M3/I?
The "M3" suffix in SMC5K40CA-M3/I denotes halogen-free, RoHS-compliant construction and industrial-grade qualification per Vishay's ordering nomenclature. It confirms compliance with JEDEC JESD201 Class 2 whisker resistance and J-STD-020 MSL Level 1 handling. The "I" indicates 13-inch tape-and-reel packaging with 3500 units per reel.
How does SMC5K40CA-M3/I differ from unidirectional TVS diodes like SMC5K40A-M3/I?
The SMC5K40CA-M3/I is bidirectional, meaning it clamps both positive and negative transients symmetrically without polarity dependence, whereas SMC5K40A-M3/I is unidirectional and requires correct anode/cathode orientation. The "CA" suffix explicitly identifies the bidirectional variant, critical for AC-coupled or differential signal protection where polarity reversal occurs.
What is the thermal resistance specification for SMC5K40CA-M3/I?
The SMC5K40CA-M3/I has a junction-to-ambient thermal resistance (RthJA) of 90 °C/W when mounted on a standard FR4 PCB per JEDEC 51-2A, and a junction-to-mount thermal resistance (RthJM) of 4.0 °C/W per JEDEC 51-14. These values enable accurate thermal modeling for high-duty-cycle surge environments and confirm suitability for under-hood automotive placement.
SMC5K40CA-M3/I 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):
- 77.5A
- Power - Peak Pulse:
- 5000W (5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMC5K40CA-M3/I FAQ
1.How can I place an order for SMC5K40CA-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC5K40CA-M3/I 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 SMC5K40CA-M3/I reliable?
The price and inventory of SMC5K40CA-M3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC5K40CA-M3/I is usually 5 days.
3.What payment methods are accepted for SMC5K40CA-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC5K40CA-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC5K40CA-M3/I?
SMC5K40CA-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC5K40CA-M3/I 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 SMC5K40CA-M3/I?
For technical support, including SMC5K40CA-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC5K40CA-M3/I requirements.
6.How does Aetrix verify that SMC5K40CA-M3/I is sourced from the original manufacturer or authorized distributors?
All SMC5K40CA-M3/I 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 SMC5K40CA-M3/I meets industry standards.
7.What is the process for return or replacement of SMC5K40CA-M3/I?
All SMC5K40CA-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMC5K40CA-M3/I, 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 SMC5K40CA-M3/I part is unused and in its original packaging.
Return procedure for SMC5K40CA-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC5K40CA-M3/I Tags
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