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Vishay General Semiconductor - Diodes Division SMCJ40CA-E3/57T
- Part No.:
- SMCJ40CA-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ40CA-E3/57T.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,478
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Product details
Overview
SMCJ40CA-E3/57T 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 at rated surge current, and operates across -55 °C to +150 °C junction temperature range - deployed in automotive power line protection and industrial sensor interface circuits.
For engineers reviewing the SMCJ40CA-E3/57T datasheet, SMCJ40CA-E3/57T pinout, SMCJ40CA-E3/57T application, or SMCJ40CA-E3/57T equivalent, key selection criteria include bidirectional clamping capability, low incremental surge resistance, AEC-Q101 qualification eligibility (via HE3 suffix variants), RoHS-compliant matte tin plating, and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This TVS diode uses a glass-passivated silicon junction to achieve sub-nanosecond response time and stable breakdown behavior under repetitive transient stress. Its bidirectional architecture enables symmetrical clamping in AC-coupled or floating signal paths without polarity sensitivity.
Rated for 1500 W peak pulse power (10/1000 μs), it delivers 23.3 A peak pulse current (IPPM) while limiting voltage to ≤64.5 V at that current. Thermal resistance is 75 °C/W junction-to-ambient (RθJA) on standard 8.0 mm × 8.0 mm copper pads, supporting reliable operation in high-energy surge environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working margin below breakdown. |
| VBR min/max | 44.4 V / 49.1 V - Breakdown occurs within this band at 1 mA test current; ensures predictable turn-on threshold. |
| VC @ IPPM | 64.5 V - Clamped voltage during 10/1000 μs 23.3 A surge; determines protected circuit's maximum overvoltage exposure. |
| PPPM | 1500 W - Peak pulse power handling capacity; validates robustness against IEC 61000-4-5 Level 4 surges. |
| ID @ VWM | 1.0 μA - Reverse leakage at 40 V; negligible loading on high-impedance signal lines or supply rails. |
| TJ max | +150 °C - Maximum junction temperature; supports under-hood automotive and industrial ambient conditions. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with J-STD-020 MSL level 1 reflow. |
Pinout & Package
SMCJ40CA-E3/57T is a two-terminal bidirectional TVS device housed in the SMC (DO-214AB) package. No polarity marking is present on bidirectional variants; both terminals are functionally symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Either terminal serves as anode or cathode depending on instantaneous voltage polarity; no fixed polarity assignment. |
| Terminal 2 | Anode/Cathode (bidirectional) | Electrically identical to Terminal 1; forms symmetrical clamping path across protected line pair (e.g., RS-485 A/B, CAN H/L). |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC-coupled or differential signal lines (e.g., USB D+/D-, CAN bus) without external polarity management. |
| 1500 W peak pulse rating | Withstands IEC 61000-4-5 4th-level surge events (4 kV/2 Ω) on 12 V automotive power rails with margin. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage stress on downstream ICs - e.g., limits 40 V rail to ≤64.5 V during surge. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; simplifies SMT manufacturing flow. |
| AEC-Q101 qualification path | HE3/HM3 suffix variants are AEC-Q101 qualified; E3/57T shares identical die and construction, enabling qualification traceability. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: 12 V battery rail in engine control units exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of DC/DC converters and microcontrollers. Use Value: Limits transients to ≤64.5 V, preventing damage to 40 V-rated input stages while surviving 1500 W surge energy. |
Use Scenario: 4–20 mA current loop transmitter connected to field sensors in factory automation. IC Role / Device Role / Timing Role: Bidirectional shunt protector across loop terminals to suppress ESD and inductive switching spikes. Use Value: Symmetrical clamping maintains loop integrity during ±15 kV contact ESD (IEC 61000-4-2) without polarity-dependent failure modes. |
| Telecom Data Line Surge Suppression | Consumer USB Port ESD Protection |
|
Use Scenario: RS-485 transceivers in building management systems subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Differential-line TVS placed across A/B bus lines to clamp common-mode and differential transients. Use Value: 64.5 V clamping voltage ensures transceiver inputs remain within absolute maximum ratings during 1 kV/42 Ω IEC 61000-4-5 surges. |
Use Scenario: USB 2.0 data lines (D+/D-) in portable media players exposed to user-handling ESD. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS integrated into USB connector assembly. Use Value: Sub-1 μA leakage at 40 V avoids signal integrity degradation; fast response preserves high-speed data eye diagram. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40CA-E3/57T | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W). | Suitable for lower-energy surges (IEC 61000-4-2 only); not recommended for IEC 61000-4-5 Level 3+. | Select when board space is constrained and surge threat level is limited to ESD and minor switching noise. |
| SMCJ43CA-E3/57T | Higher VWM (43 V), VBR (47.8–52.8 V), VC (69.4 V); otherwise identical SMC package and 1500 W rating. | Better margin for 42 V nominal systems (e.g., 36 V automotive); slightly higher clamping voltage reduces protection tightness. | Choose when protecting 42 V battery systems where 40 V VWM risks premature conduction during normal operation. |
Compared with SMCJ40CA-E3/57T, SMAJ40CA-E3/57T trades surge robustness for compactness, while SMCJ43CA-E3/57T offers higher standoff voltage for 36–42 V systems - both retain bidirectional operation and RoHS-compliant matte tin terminations but differ in thermal performance and system-level voltage margining.
Availability
SMCJ40CA-E3/57T is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, telecom data line protection, and consumer USB port hardening requiring stable component supply and full traceability.
Supply support for SMCJ40CA-E3/57T 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 high-power handling.
The SMCJ series was developed specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where 1500 W surge immunity and AEC-Q101 readiness are mandatory.
FAQ
What is the clamping voltage of SMCJ40CA-E3/57T at its rated peak pulse current?
The SMCJ40CA-E3/57T clamps to a maximum of 64.5 V when subjected to its rated 23.3 A peak pulse current (IPPM) under a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 standards and confirmed in Vishay's datasheet revision 09-Jan-2024 (Document Number: 88394). The SMCJ40CA-E3/57T achieves this clamping performance while maintaining low incremental surge resistance, ensuring consistent voltage limiting across multiple surge events.
Is SMCJ40CA-E3/57T suitable for automotive applications?
Yes, SMCJ40CA-E3/57T is built on the same die and package as AEC-Q101-qualified variants (e.g., SMCJ40CAHE3_A/H), sharing identical electrical characteristics, glass-passivated junction, and thermal design. While the E3/57T suffix denotes commercial-grade RoHS compliance, its construction meets automotive reliability requirements - making it widely deployed in non-safety-critical automotive subsystems such as body control modules and infotainment power rails.
How does the bidirectional nature of SMCJ40CA-E3/57T affect its use in circuit design?
The bidirectional configuration of SMCJ40CA-E3/57T eliminates polarity dependency, allowing direct placement across AC-coupled or differential signal pairs like RS-485, CAN, or Ethernet PHY lines without orientation concerns. Unlike unidirectional TVS diodes, the SMCJ40CA-E3/57T provides symmetrical clamping in both voltage polarities - critical for protecting balanced interfaces where transient polarity is unpredictable.
What is the thermal resistance of SMCJ40CA-E3/57T, and how does it impact PCB layout?
The SMCJ40CA-E3/57T 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, as specified in the Vishay datasheet. This value assumes minimum recommended pad layout; reducing pad area increases thermal resistance and may derate surge capability. For sustained power dissipation or high ambient temperatures, designers should verify thermal margins using the device's 6.5 W steady-state power rating and derating curve (Figure 2).
Does SMCJ40CA-E3/57T require special handling during reflow soldering?
No - SMCJ40CA-E3/57T is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and withstands standard lead-free reflow profiles (peak 260 °C) without preconditioning or baking. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102, and whisker resistance meets JESD 201 Class 2. This makes the SMCJ40CA-E3/57T fully compatible with high-volume automated SMT assembly lines.
SMCJ40CA-E3/57T 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-E3/57T FAQ
1.How can I place an order for SMCJ40CA-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ40CA-E3/57T 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-E3/57T reliable?
The price and inventory of SMCJ40CA-E3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ40CA-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ40CA-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ40CA-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ40CA-E3/57T?
SMCJ40CA-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ40CA-E3/57T 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-E3/57T?
For technical support, including SMCJ40CA-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ40CA-E3/57T requirements.
6.How does Aetrix verify that SMCJ40CA-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ40CA-E3/57T 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-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ40CA-E3/57T?
All SMCJ40CA-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ40CA-E3/57T, 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-E3/57T part is unused and in its original packaging.
Return procedure for SMCJ40CA-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ40CA-E3/57T Tags
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