SMCJ400A

The SMCJ400A is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed to protect sensitive electronic components from voltage spikes and transients. This device is particularly useful in applications where overvoltage protection is critical, such as in telecommunications, automotive electronics, and industrial equipment.

Key Features:

1. Voltage Rating: The SMCJ400A has a breakdown voltage of approximately 400 volts, making it suitable for clamping high-voltage transients while allowing normal operating voltages to pass through without interference.

2. Power Dissipation: It is capable of handling a peak power dissipation of up to 600 watts, which allows it to absorb significant energy from transient events without failing.

3. Package Type: The SMCJ400A is housed in a DO-214AB (SMC) package, which is a surface-mount device that provides a compact footprint while ensuring efficient thermal management. The package is designed for easy integration into circuit boards.

4. Clamping Voltage: The device features a low clamping voltage, which means it can effectively limit the voltage that reaches sensitive components during a transient event, thereby preventing damage.

5. Response Time: The SMCJ400A has a fast response time, typically in the nanosecond range, allowing it to react quickly to voltage spikes and provide immediate protection.

6. Temperature Range: It operates effectively over a wide temperature range, typically from -55°C to +150°C, making it suitable for various environmental conditions.

7. Applications: Common applications for the SMCJ400A include ESD protection, surge protection in power supplies, and safeguarding sensitive components in automotive and industrial systems.

8. Compliance and Standards: The device meets various industry standards for safety and performance, ensuring reliability in critical applications.

Electrical Characteristics:

• Reverse Stand-off Voltage (V_R): 400V
• Breakdown Voltage (V_BR): Typically around 440V
• Clamping Voltage (V_C): Approximately 600V at a specified surge current
• Peak Pulse Power (P_PP): 600W (for 10/1000μs waveform)
• Capacitance (C): Low capacitance values, ensuring minimal impact on signal integrity in high-speed applications.

Conclusion:

The SMCJ400A from Littelfuse Inc. is a robust and reliable transient voltage suppressor that provides essential protection for electronic circuits against voltage spikes. Its combination of high power handling, fast response time, and compact packaging makes it an ideal choice for a wide range of applications where overvoltage protection is paramount.