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Vishay General Semiconductor - Diodes Division SMCJ40CA-E3/9AT
- Part No.:
- SMCJ40CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ40CA-E3/9AT.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,421
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Product details
Overview
SMCJ40CA-E3/9AT from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients on power and signal lines. It features 40 V standoff voltage (VWM), 64.5 V maximum clamping voltage (VC) at 23.3 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMCJ40CA-E3/9AT datasheet, SMCJ40CA-E3/9AT pinout, SMCJ40CA-E3/9AT application, or SMCJ40CA-E3/9AT equivalent, key selection criteria include bidirectional surge capability, low clamping ratio (VC/VWM = 1.61), AEC-Q101 qualification eligibility (via HE3 suffix variants), RoHS-compliant matte tin terminations, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This device operates as a voltage-clamping protector using an avalanche breakdown mechanism, with symmetrical bidirectional conduction enabling suppression of both positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while MSL Level 1 rating supports lead-free reflow up to 260 °C peak.
The thermal resistance (RθJA = 75 °C/W) and junction-to-lead resistance (RθJL = 15 °C/W) define its transient power handling under real PCB layout conditions; derating above 25 °C ambient follows Fig. 2 in the datasheet, maintaining safe operation up to TJ = 150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines circuit's normal operating margin. |
| VBR min/max | 44.4 V / 49.1 V at IT = 1.0 mA - Verified breakdown range ensures reliable turn-on during overvoltage events. |
| VC @ IPPM | 64.5 V at 23.3 A - Clamping voltage limits downstream component stress during 10/1000 µs surge. |
| PPPM | 1500 W - Peak transient energy absorption capacity under standardized waveform; critical for IEC 61000-4-5 compliance margin. |
| ID @ VWM | <1.0 µA - Ultra-low leakage preserves signal integrity and minimizes standby power loss in high-impedance circuits. |
| TJ max | +150 °C - Enables use in under-hood automotive environments and thermally constrained industrial enclosures. |
| Package | SMC (DO-214AB) - Standardized 2-pin surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with IPC-7351B. |
Pinout & Package
SMCJ40CA-E3/9AT uses a 2-terminal SMC (DO-214AB) package with no polarity marking for bidirectional operation. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient conduction path | No functional distinction between terminals; either terminal serves as input/output for AC or dual-polarity DC protection. |
| Case (body) | Thermal and mechanical interface | Plastic body provides UL 94 V-0 flammability rating; copper pad layout (8.0 mm × 8.0 mm per terminal) required for rated PPPM performance. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines or floating differential signals without external polarity management. |
| 1500 W peak pulse power | Supports robust immunity against IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) when properly mounted. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage exposure to protected ICs - e.g., keeps 3.3 V or 5 V logic rails within safe operating area during transients. |
| AEC-Q101 qualification path | HE3/HM3 suffix variants are qualified for automotive applications; E3 suffix meets commercial-grade reliability with same form-factor. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard Pb-free reflow (260 °C peak) without baking preconditioning. |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Primary clamping element across power rail inputs, placed upstream of DC/DC converters and microcontrollers. Use Value: Limits voltage excursions to ≤64.5 V during 1500 W surges, preventing latch-up or gate oxide damage in downstream Si devices. |
Use Scenario: Shielding analog front-end inputs of temperature/pressure sensors in PLC modules from ESD and inductive switching noise. IC Role / Device Role / Timing Role: Low-capacitance (typ. <100 pF at 0 V) shunt protector on differential signal pairs (e.g., RS-485, CAN FD stubs). Use Value: Maintains signal fidelity with sub-µA leakage at 40 V bias while clamping fast transients (<1 ns response) before they reach precision ADCs. |
| Telecom DC Power Feeds | Consumer Device USB Power Input |
|
Use Scenario: Safeguarding PoE-powered equipment (e.g., IP cameras) against lightning-induced surges on 48 V DC input lines. IC Role / Device Role / Timing Role: First-stage transient suppressor before primary DC/DC regulation, coordinated with MOVs or GDTs in hybrid protection schemes. Use Value: Absorbs 1500 W pulses without degradation, enabling compact design versus higher-capacitance alternatives that distort high-frequency power signals. |
Use Scenario: Hardening 5 V USB-C power input stages in portable audio gear against hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional clamp on VBUS line, working with polyfuse and overvoltage lockout ICs in integrated protection ICs. Use Value: Delivers 64.5 V clamping at 23.3 A with no polarity dependency - simplifies layout and eliminates risk of reverse installation during assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC40CA-TB-E3 | Same VWM (40 V) and PPPM (1500 W), but SOD-123FL package (smaller footprint, lower thermal mass). | Limited to lower-energy transients due to reduced copper pad area; unsuitable for sustained surge duty cycles. | Select when board space is constrained and peak surge duration is <100 µs. |
| 1.5KE40CA | Through-hole DO-201 package, identical electrical specs (VWM = 40 V, VC = 64.5 V, PPPM = 1500 W), higher RθJA (100 °C/W). | Requires wave soldering or hand-soldering; not compatible with high-speed SMT lines or dense layouts. | Choose for legacy through-hole designs or prototyping where reflow compatibility is not required. |
Compared with SAC40CA-TB-E3 and 1.5KE40CA, the SMCJ40CA-E3/9AT delivers optimal balance of high-power surge handling, SMT manufacturability, and thermal performance on standard FR-4 with 8 mm² copper pads - making it preferred for volume automotive and industrial production.
Availability
SMCJ40CA-E3/9AT is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, telecom DC power feeds, and consumer device USB power input requiring stable component supply and full traceability.
Supply support for SMCJ40CA-E3/9AT 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 AEC-Q qualification.
The SMCJ series was developed for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure modes must be mitigated without compromising signal integrity or thermal stability.
FAQ
What is the clamping voltage of SMCJ40CA-E3/9AT at its rated peak pulse current?
The SMCJ40CA-E3/9AT has a maximum clamping voltage (VC) of 64.5 V at 23.3 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value is measured per ANSI/IEEE C62.35 standards and reflects worst-case voltage seen by protected circuitry during surge events - a critical parameter for ensuring downstream ICs remain within absolute maximum ratings. The SMCJ40CA-E3/9AT achieves this with a clamping ratio of 1.61 (VC/VWM), indicating efficient transient suppression.
Is SMCJ40CA-E3/9AT suitable for automotive applications?
The SMCJ40CA-E3/9AT itself is commercial-grade (E3 suffix), but Vishay offers AEC-Q101-qualified versions under HE3 and HM3 suffixes (e.g., SMCJ40CAHE3_A/I). While the SMCJ40CA-E3/9AT shares identical electrical and thermal specifications, its qualification status depends on suffix - users requiring automotive-grade assurance must select HE3/HM3 variants. The SMCJ40CA-E3/9AT remains widely deployed in non-safety-critical automotive subsystems where commercial reliability suffices.
How does the bidirectional nature of SMCJ40CA-E3/9AT affect its PCB layout?
The SMCJ40CA-E3/9AT has no polarity marking and functions identically regardless of terminal orientation, eliminating orientation-dependent placement errors during SMT assembly. This simplifies pick-and-place programming and reduces inspection overhead. Layout requires symmetric 8.0 mm × 8.0 mm copper pads per terminal to achieve rated 1500 W pulse power; asymmetry or undersized pads will degrade clamping performance and increase thermal impedance. No ground plane isolation or guard rings are needed beyond standard creepage/clearance rules.
What is the maximum operating temperature for SMCJ40CA-E3/9AT?
The SMCJ40CA-E3/9AT has a maximum junction temperature (TJ max) of +150 °C, verified per JEDEC test conditions. This allows operation in under-hood automotive environments, industrial motor drives, and enclosed power supplies where ambient temperatures exceed 85 °C. Derating curves (Fig. 2 in datasheet) show usable pulse power drops linearly above 25 °C ambient - at 100 °C ambient, the device retains ~60 % of its 1500 W rating when mounted on specified copper pads. The SMCJ40CA-E3/9AT maintains stable VBR and low leakage across this full range.
Does SMCJ40CA-E3/9AT require external heat sinking?
No external heat sink is required for transient suppression, as the SMCJ40CA-E3/9AT handles short-duration surges (≤1000 µs) via junction thermal capacitance. However, its steady-state power dissipation (PD = 6.5 W at TA = 50 °C) assumes infinite heatsink conditions - in practice, PCB copper acts as the thermal mass. For repeated surge events or elevated ambient temperatures, thermal relief via internal layer copper pours and thermal vias beneath the SMCJ40CA-E3/9AT pads is recommended to maintain TJ ≤ 150 °C. The device's RθJL = 15 °C/W enables effective conduction into PCB planes.
SMCJ40CA-E3/9AT 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 (SMCJ)
SMCJ40CA-E3/9AT FAQ
1.How can I place an order for SMCJ40CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ40CA-E3/9AT 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-E3/9AT reliable?
The price and inventory of SMCJ40CA-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ40CA-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ40CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ40CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ40CA-E3/9AT?
SMCJ40CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ40CA-E3/9AT 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-E3/9AT?
For technical support, including SMCJ40CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ40CA-E3/9AT requirements.
6.How does Aetrix verify that SMCJ40CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ40CA-E3/9AT 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-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ40CA-E3/9AT?
All SMCJ40CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ40CA-E3/9AT, 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-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ40CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ40CA-E3/9AT Tags
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