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 spikes 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 dimensions typically measure about 5.2 mm x 6.0 mm, with a height of approximately 2.5 mm.

4. Clamping Voltage: The SMBJ40CA features a low clamping voltage, which ensures that the voltage across the protected load remains within safe limits during transient events.

5. Response Time: The device has a fast response time, which is crucial for protecting sensitive components from damage due to rapid voltage spikes.

6. Operating 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 include ESD protection, surge protection in power supplies, and safeguarding data lines in communication devices.

8. Compliance and Standards: The SMBJ40CA meets various industry standards for reliability and performance, ensuring it can be used 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)
• Capacitance: Low capacitance values, ensuring minimal impact on signal integrity in high-speed applications.

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 compact size, high power handling capability, and fast response time make it an ideal choice for a wide range of applications where overvoltage protection is necessary.