SMBJ40CA

The SMBJ40CA 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 consumer electronics.

Key Features:

1. Voltage Rating: The SMBJ40CA is rated for a breakdown voltage of approximately 40 volts, making it suitable for clamping voltage transients that exceed this threshold.

2. Power Dissipation: It has a peak power dissipation capability of around 600 watts, allowing it to absorb significant energy from transient events without failing.

3. Package Type: The diode is housed in a DO-214AA (SMB) package, which is a surface-mount device (SMD) that provides a compact footprint for easy integration into circuit boards. The package is designed for efficient thermal management, ensuring that heat generated during operation is dissipated effectively.

4. Clamping Voltage: The SMBJ40CA features a low clamping voltage, which means it can limit the voltage seen by the protected circuit to a safe level during a transient event. This is crucial for safeguarding sensitive components from damage.

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

6. Operating Temperature Range: The SMBJ40CA 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 include ESD protection, surge protection in power supplies, and safeguarding data lines in communication equipment. It is also used in automotive applications to protect against load dump and other transient events.

8. Compliance and Standards: The SMBJ40CA complies with various industry standards, ensuring reliability and performance in critical applications.

Electrical Characteristics:

• Reverse Stand-off Voltage (V_R): 40V
• Breakdown Voltage (V_BR): Typically around 44V
• Clamping Voltage (V_C): Approximately 60V at a specified peak pulse current
• Peak Pulse Power (P_PP): 600W (for 8/20μs waveform)

Conclusion:

The SMBJ40CA from Littelfuse Inc. is a robust and reliable transient voltage suppressor diode that provides essential protection for electronic circuits against voltage transients. 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 necessary.