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Vishay General Semiconductor - Diodes Division SMCJ40CA-M3/9AT
- Part No.:
- SMCJ40CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ40CA-M3/9AT.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,306
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Product details
Overview
SMCJ40CA-M3/9AT from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients up to 1500 W peak pulse power with a 10/1000 µs waveform. It features a 40 V standoff voltage (VWM), 64.5 V maximum clamping voltage (VC) at 23.3 A peak pulse current (IPPM), and operates across -55 °C to +150 °C junction temperature range. It is widely deployed in automotive sensor signal lines and industrial I/O protection.
For engineers reviewing the SMCJ40CA-M3/9AT datasheet, SMCJ40CA-M3/9AT pinout, SMCJ40CA-M3/9AT application, or SMCJ40CA-M3/9AT equivalent, this page delivers verified electrical specs, thermal behavior, mechanical footprint, AEC-Q101 qualification status, and real-world protection use cases - all confirmed against Vishay Document #88394 (Rev. 09-Jan-2024).
Technical Context
The SMCJ40CA-M3/9AT uses a glass-passivated silicon junction optimized for fast transient response (<1 ns) and low incremental surge resistance. Its bidirectional architecture enables symmetrical clamping in both polarities without polarity marking, supporting AC-coupled or floating signal paths.
It meets J-STD-020 MSL Level 1 (peak reflow 260 °C), has matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and achieves 75 °C/W junction-to-ambient thermal resistance on standard 8.0 mm × 8.0 mm copper pads per terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 40 V - Maximum continuous reverse voltage before clamping begins; defines operating margin below breakdown. |
| VBR (Breakdown Voltage) | 44.4–49.1 V at 1 mA - Confirmed minimum/maximum breakdown threshold under standardized test conditions. |
| VC (Clamping Voltage) | 64.5 V at IPPM = 23.3 A - Peak voltage seen by protected circuit during 10/1000 µs surge; critical for IC survival. |
| PPPM (Peak Pulse Power) | 1500 W - Surge energy handling capacity under standardized 10/1000 µs waveform; determines robustness vs. lightning/EFT. |
| ID (Reverse Leakage) | 1.0 µA max at VWM - Ensures minimal standby power loss and signal integrity in high-impedance circuits. |
| TJ Range | -55 °C to +150 °C - Enables deployment in under-hood automotive, industrial motor drives, and outdoor telecom equipment. |
| Package | SMC (DO-214AB) - Standardized 2-pin surface-mount outline with 7.75 mm × 6.22 mm body and 2.62 mm height; compatible with automated pick-and-place. |
Pinout & Package
SMCJ40CA-M3/9AT is housed in an SMC (DO-214AB) package: a 2-terminal, non-polarized, bidirectional TVS diode with no cathode band marking. Terminals are matte tin-plated leads suitable for reflow soldering per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional conduction path | Both terminals function identically; no polarity dependency - simplifies PCB layout for AC or floating signals. |
| Case (body) | Thermal and mechanical interface | Non-electrical; provides mechanical anchoring and heatsinking via copper pad contact per JEDEC MO-213AA. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled interfaces (e.g., RS-485, CAN, Ethernet PHY) without polarity concerns. |
| AEC-Q101 qualified variant available | HM3 suffix indicates halogen-free, RoHS-compliant, and automotive-grade qualification - validated for engine control, ADAS sensors. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving protection margin for 3.3 V/5 V logic and analog front-ends. |
| MSL Level 1 rating | Supports lead-free reflow without pre-baking; compatible with standard SMT assembly lines using peak temperatures up to 260 °C. |
| UL 497B recognized (QVGQ2) | Meets Underwriters Laboratories requirements for telecom/data line protectors - simplifies end-equipment safety certification. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting LIN bus or analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching spikes in vehicle ECUs. IC Role / Device Role: Bidirectional voltage clamp placed between signal line and ground, absorbing transients before reaching MCU ADC or transceiver. Use Value: Maintains signal integrity under ISO 7637-2 Pulse 5a (load dump) and ensures <1 µA leakage at 40 V VWM for low-power sensor sleep modes. |
Use Scenario: Shielding PLC digital input modules from field-wiring surges caused by relay coil de-energization or ESD events. IC Role / Device Role: Primary transient suppressor on 24 V DC input lines, mounted directly at connector entry point. Use Value: Clamps to ≤64.5 V within nanoseconds, preventing damage to optocoupler input stages and enabling compliance with IEC 61000-4-5 Level 3 (2 kV). |
| Telecom Line Protection | Consumer Power Adapter Feedback Loop |
Use Scenario: Safeguarding Ethernet PHY differential pairs and PoE detection circuitry against lightning-induced surges on outdoor network ports. IC Role / Device Role: Common-mode TVS pair (two SMCJ40CA devices) across data lines to chassis ground, leveraging bidirectional symmetry. Use Value: Delivers 1500 W surge capability with <1 ns response, meeting UL 497B and GR-1089-CORE requirements for telecom infrastructure. |
Use Scenario: Protecting optocoupler feedback pins in isolated AC/DC adapters from secondary-side voltage spikes during transformer reset or MOSFET switching. IC Role / Device Role: Clamp device across feedback resistor divider to limit voltage excursion during overvoltage fault conditions. Use Value: 40 V VWM aligns with typical TL431 reference voltage ranges; 64.5 V VC prevents optocoupler CTR degradation during transient events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40CA-E3/61T | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W), same VWM/VC ratings. | Better suited for space-constrained consumer electronics where 400 W surge margin suffices. | Select when board area is limited and surge threat level is moderate (IEC 61000-4-2 ±8 kV, not lightning-level). |
| SMCJ40CAHM3_A/I | Identical electrical specs; HM3 suffix denotes AEC-Q101 qualification and halogen-free construction. | Required for automotive production programs needing PPAP documentation and long-term reliability validation. | Choose for Tier 1 automotive designs where qualification traceability and extended temperature cycling are mandatory. |
Compared with SMAJ40CA-E3/61T, SMCJ40CA-M3/9AT offers 275 % higher surge power handling and lower thermal resistance - critical for industrial environments. Against SMCJ40CAHM3_A/I, it shares core performance but lacks formal AEC-Q101 certification, making it suitable for cost-sensitive commercial or industrial applications where automotive qualification is not required.
Availability
SMCJ40CA-M3/9AT is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O interface hardening, and telecom line surge suppression requiring stable component supply, full traceability, and volume-ready packaging (3500 pcs/reel on 13" tape).
Supply support for SMCJ40CA-M3/9AT 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, power efficiency, and automotive-grade qualification.
The SMCJ series was engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial automation, and telecom infrastructure where failure tolerance and long-term stability are non-negotiable.
FAQ
What is the clamping voltage of SMCJ40CA-M3/9AT at its rated peak pulse current?
The SMCJ40CA-M3/9AT has a maximum clamping voltage (VC) of 64.5 V at its rated peak pulse current (IPPM) of 23.3 A, measured under the standardized 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ40CA-M3/9AT maintains this clamping performance due to its low incremental surge resistance and glass-passivated junction design.
Is SMCJ40CA-M3/9AT suitable for automotive applications?
SMCJ40CA-M3/9AT is halogen-free and RoHS-compliant but is not AEC-Q101 qualified. For automotive production, Vishay offers the SMCJ40CAHM3_A/I variant, which carries full AEC-Q101 qualification. The SMCJ40CA-M3/9AT may be used in non-safety-critical automotive subsystems (e.g., infotainment power rails) where qualification is not mandated, but designers must validate reliability independently. The SMCJ40CA-M3/9AT shares identical electrical specs with its HM3 counterpart except for qualification status.
How does the bidirectional nature of SMCJ40CA-M3/9AT affect PCB layout?
The SMCJ40CA-M3/9AT has no polarity marking and functions identically in both directions, eliminating orientation constraints during placement. This simplifies PCB layout for AC-coupled or floating signal paths such as RS-485, CAN FD, or Ethernet differential pairs. Unlike unidirectional TVS diodes, the SMCJ40CA-M3/9AT requires no cathode alignment check, reducing assembly errors and enabling symmetric routing. Its SMC (DO-214AB) footprint remains unchanged regardless of signal polarity.
What is the thermal resistance of SMCJ40CA-M3/9AT, and how does it impact power derating?
The SMCJ40CA-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. This value directly governs steady-state power derating: at 50 °C ambient, its power dissipation (PD) drops to 6.5 W, and above 25 °C, derating follows the curve in Figure 2 of Vishay Doc #88394. Proper copper pour design is essential to maintain clamping performance during repetitive surges, as excessive junction temperature reduces surge lifetime. The SMCJ40CA-M3/9AT's RθJL of 15 °C/W further supports heat transfer through leads into the PCB.
Does SMCJ40CA-M3/9AT meet any safety certifications?
Yes, the SMCJ40CA-M3/9AT is Underwriters Laboratories (UL) recognized under file E136766 for both unidirectional and bidirectional configurations, complying with UL 497B for primary protector classification. It also meets the flammability requirement UL 94 V-0 for its molding compound. These certifications validate its suitability in telecom, industrial, and consumer equipment requiring third-party safety approval. The SMCJ40CA-M3/9AT's recognition applies to the base device - no additional system-level testing is needed for UL listing when used per Vishay's recommended layout guidelines.
SMCJ40CA-M3/9AT 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):
- 23.3A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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 (SMC)
SMCJ40CA-M3/9AT FAQ
1.How can I place an order for SMCJ40CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ40CA-M3/9AT 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 SMCJ40CA-M3/9AT reliable?
The price and inventory of SMCJ40CA-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ40CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ40CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ40CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ40CA-M3/9AT?
SMCJ40CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ40CA-M3/9AT 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 SMCJ40CA-M3/9AT?
For technical support, including SMCJ40CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ40CA-M3/9AT requirements.
6.How does Aetrix verify that SMCJ40CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ40CA-M3/9AT 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 SMCJ40CA-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ40CA-M3/9AT?
All SMCJ40CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ40CA-M3/9AT, 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 SMCJ40CA-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ40CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ40CA-M3/9AT Tags
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