SMBJ85CA-M3/5B Circuit Protection

Transient Voltage Suppressor (TVS) diodes are a type of semiconductor device that acts as a protector for sensitive electronics. They are usually used to protect against over-voltage or voltage spikes, and they can also be used to protect against reverse connection. The SMBJ85CA-M3/5B is a TVS diode that is commonly used in a variety of applications due to its high voltage breaking capacity (VBR) of 8.5 V and its surge capability of 5 A.

Application Field of SMBJ85CA-M3/5B

The SMBJ85CA-M3/5B is most commonly used in consumer electronics, such as DVD players, laptop computers, and digital cameras. It is also used in industrial electronics, such as power supplies and motor controllers. Additionally, the SMBJ85CA-M3/5B is commonly used in circuit protection, surge protection, and transient protection.

The SMBJ85CA-M3/5B is also suitable for automotive applications, such as battery protection, engine control units, and computer power supplies. It is also well-suited for other applications, such as energy management, microprocessor protection, and lightning protection.

Working Principle of SMBJ85CA-M3/5B

The working principle of the SMBJ85CA-M3/5B is based on the Zener Model of Breakdown Voltage. This model is based on the recombination mechanism of electrons and holes in the diode. When the reverse voltage across the diode exceeds the breakdown voltage, a large number of electrons and holes recombine, creating an avalanche effect. This avalanche effect causes a large current through the diode, which in turn limits the voltage across the diode to the breakdown voltage.

The SMBJ85CA-M3/5B can handle a surge current of up to 5 A. This is because the device has a very low internal resistance (R_S) and a very low VBR. The low R_S is due to the large area of the TVS diode, which acts to reduce the resistance. The low VBR is due to the Zener mechanism of the diode.

The SMBJ85CA-M3/5B also has a built-in thermal shutdown circuit. This thermal shutdown circuit is designed to protect the diode from overheating. When the diode reaches a certain temperature, the thermal shutdown circuit will activate, reducing the current through the diode in order to prevent further damage.

The SMBJ85CA-M3/5B has a very low leakage current, which is beneficial for many applications. Low leakage current means that the device does not draw power unnecessarily, and it stays cool during operation. This is important in applications where high currents could be potentially damaging.

In summary, the SMBJ85CA-M3/5B is a TVS diode commonly used in consumer electronics, industrial electronics, automotive applications, and circuit protection. It has a high VBR and surge capability, making it an ideal choice for many applications. The device also has a low leakage current, which makes it efficient and reliable.