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Vishay General Semiconductor - Diodes Division SMCG40CA-E3/9AT
- Part No.:
- SMCG40CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG40CA-E3/9AT.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,412
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Product details
Overview
SMCG40CA-E3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in the SMCG (DO-215AB) package, designed for high-energy surge protection on signal and power lines. It features a 40 V stand-off voltage (VWM), 1500 W peak pulse power (PPPM), clamping voltage of 64.5 V at 23.3 A, and AEC-Q101 qualification for automotive reliability.
For engineers reviewing the SMCG40CA-E3/9AT datasheet, SMCG40CA-E3/9AT pinout, SMCG40CA-E3/9AT application, or SMCG40CA-E3/9AT equivalent, this device is selected for robust ESD and lightning surge protection in automotive sensor interfaces, industrial I/O modules, and telecom line cards where bidirectional clamping and low clamping ratio are critical.
Technical Context
The SMCG40CA-E3/9AT operates as a bidirectional avalanche diode with symmetrical breakdown characteristics in both polarities, enabling protection of AC-coupled or floating signal paths without polarity concerns. Its glass-passivated junction ensures stable VBR (44.4–49.1 V) and low incremental surge resistance under 10/1000 μs transients.
Thermally, it exhibits RθJA = 75 °C/W and RθJL = 15 °C/W, supporting operation up to TJ = 150 °C when mounted on 8.0 mm × 8.0 mm copper pads. It meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 for automotive under-hood and chassis applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR min/max | 44.4 V / 49.1 V - Breakdown occurs within this band at 1 mA test current; ensures predictable turn-on across production lot. |
| VC @ IPPM | 64.5 V at 23.3 A - Clamped voltage during 10/1000 μs surge; limits stress on downstream ICs to safe levels. |
| PPPM | 1500 W - Peak pulse power handling capability; supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) surge immunity. |
| ID @ VWM | 1.0 μA - Reverse leakage at stand-off voltage; negligible power loss and signal distortion in standby. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments. |
| Package | SMCG (DO-215AB) - Surface-mount gull-wing package with 3.17 mm lead pitch; optimized for automated placement and thermal relief. |
Pinout & Package
SMCG40CA-E3/9AT uses the SMCG (DO-215AB) surface-mount package: a dual-leaded, gull-wing outline with cathode/anode symmetry for bidirectional operation. No polarity marking is present on bidirectional variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient conduction path (positive half-cycle) | Conducts surge current when voltage exceeds +VBR; forms symmetrical clamp with cathode terminal. |
| Cathode | Transient conduction path (negative half-cycle) | Conducts surge current when voltage exceeds –VBR; enables full-wave clamping without external polarity management. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock per AEC standard. |
| Glass-passivated junction | Ensures stable breakdown voltage over time and environmental stress, minimizing parameter drift in harsh conditions. |
| MSL Level 1 rating | Allows unlimited floor life and reflow at peak 260 °C without moisture-induced damage during assembly. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Delivers tight voltage limiting relative to breakdown, reducing overvoltage margin required by protected ICs. |
| UL 94 V-0 molding compound | Self-extinguishing encapsulation material meeting flammability safety requirements for industrial and automotive enclosures. |
Applications
| Automotive Sensor Interface | Industrial PLC Analog Input |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog front-ends in engine control units against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed directly at connector entry point to shunt surge energy before reaching signal conditioning ICs. Use Value: Withstands 1500 W surges while clamping to ≤64.5 V, preserving integrity of 5 V or 3.3 V microcontrollers and ADCs downstream. | Use Scenario: Safeguarding 4–20 mA current loop inputs in programmable logic controllers exposed to field wiring transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on differential input terminals, operating symmetrically across ±15 V common-mode range. Use Value: 1.0 μA leakage at 40 V stand-off avoids loading precision current-sense resistors; bidirectional symmetry eliminates need for polarity-aware layout. |
| Telecom Line Card Protection | Consumer USB-C Port ESD |
Use Scenario: Shielding Ethernet PHYs and PoE injectors from lightning-induced surges on twisted-pair data lines. IC Role / Device Role / Timing Role: Secondary-level surge protector located after gas discharge tube (GDT) primary stage, providing fast-response clamping. Use Value: 10/1000 μs response ensures clamping within nanoseconds, complementing slower GDTs to meet ITU-T K.20/21 immunity standards. | Use Scenario: Adding robust system-level ESD protection to USB-C receptacles in laptops and docking stations. IC Role / Device Role / Timing Role: Board-level TVS placed between connector and USB controller IC, rated for ±15 kV contact/±20 kV air IEC 61000-4-2. Use Value: 64.5 V clamping voltage stays below absolute maximum ratings of USB 3.2 Gen 2x2 transceivers (typically 7 V), preventing latch-up or damage. |
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 | Same VWM (40 V) and PPPM (400 W), but lower power rating; SMA package (DO-214AC), smaller footprint and thermal mass. | Lower surge capacity suits consumer-grade or space-constrained designs; not AEC-Q101 qualified. | Select SMAJ40CA only if surge threat level is limited to IEC 61000-4-2 ESD or low-energy transients, not full IEC 61000-4-5 surges. |
| SMCJ40CA | Same VWM (40 V) and higher PPPM (1500 W); identical DO-214AB package (not SMCG), slightly larger body and different lead form. | Compatible surge rating but requires PCB pad redesign due to different package outline and lead pitch (5.3 mm vs. 3.17 mm). | Choose SMCJ40CA only if existing layout accommodates DO-214AB and thermal design supports its higher RθJA (~85 °C/W). |
Compared with SMCG40CA-E3/9AT, SMAJ40CA offers reduced cost and size but lacks automotive qualification and surge headroom, while SMCJ40CA matches power capability but demands mechanical redesign-making SMCG40CA-E3/9AT optimal for new AEC-Q101-compliant designs needing compact, high-power bidirectional clamping.
Availability
SMCG40CA-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC analog inputs, and telecom line card protection requiring stable component supply and long-term lifecycle support.
Supply support for SMCG40CA-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMCG series targets high-reliability transient suppression in automotive and industrial systems, engineered to deliver consistent clamping behavior, AEC-Q101 compliance, and robust thermal performance in surface-mount form factors.
FAQ
What is the breakdown voltage range of the SMCG40CA-E3/9AT?
The SMCG40CA-E3/9AT has a specified breakdown voltage (VBR) range of 44.4 V to 49.1 V at 10 mA test current, per Vishay's datasheet Document Number 88457. This range ensures reliable, repeatable avalanche conduction onset across manufacturing lots and temperature extremes, directly supporting its role as a precision clamping device in the SMCG40CA-E3/9AT design.
Is the SMCG40CA-E3/9AT suitable for automotive applications?
Yes, the SMCG40CA-E3/9AT is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood and chassis-mounted systems. Its construction-including glass-passivated junction, MSL Level 1 reflow compatibility, and operation up to +150 °C-ensures reliability in automotive environments, making the SMCG40CA-E3/9AT appropriate for ECUs, ADAS sensors, and infotainment interfaces.
Does the SMCG40CA-E3/9AT have polarity markings on the package?
No, the SMCG40CA-E3/9AT does not feature polarity markings because it is a bidirectional TVS diode. As confirmed in the Vishay datasheet, "no marking on bidirectional types" - meaning both terminals are functionally symmetric, and the device clamps equally for positive and negative transients, eliminating orientation constraints during placement of the SMCG40CA-E3/9AT.
What is the maximum clamping voltage of the SMCG40CA-E3/9AT under surge conditions?
The SMCG40CA-E3/9AT clamps to a maximum of 64.5 V at 23.3 A peak pulse current (IPPM) under a standardized 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during worst-case surge events, a key specification for validating system-level immunity when using the SMCG40CA-E3/9AT.
How does the SMCG40CA-E3/9AT differ from unidirectional variants like SMCG40A?
The SMCG40CA-E3/9AT is bidirectional, providing symmetrical clamping for both polarities, whereas SMCG40A is unidirectional with a cathode band and only clamps negative transients. The CA suffix denotes bidirectional functionality, and the SMCG40CA-E3/9AT datasheet confirms identical VWM (40 V) and PPPM (1500 W) but distinct polarity behavior - critical for AC-coupled or floating signal paths where the SMCG40CA-E3/9AT is mandatory.
SMCG40CA-E3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-215AB, SMC Gull Wing
- 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 (SMCG)
SMCG40CA-E3/9AT FAQ
1.How can I place an order for SMCG40CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG40CA-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 SMCG40CA-E3/9AT reliable?
The price and inventory of SMCG40CA-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 SMCG40CA-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG40CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG40CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG40CA-E3/9AT?
SMCG40CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG40CA-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 SMCG40CA-E3/9AT?
For technical support, including SMCG40CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG40CA-E3/9AT requirements.
6.How does Aetrix verify that SMCG40CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG40CA-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 SMCG40CA-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG40CA-E3/9AT?
All SMCG40CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG40CA-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 SMCG40CA-E3/9AT part is unused and in its original packaging.
Return procedure for SMCG40CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG40CA-E3/9AT Tags
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