MOS tube selection guide: How to choose the MOS tube suitable for your project?

Choosing the right MOS tube is crucial to controlling costs and product performance. The correct choice will ensure that the equipment operates efficiently and stably during use.

First, determine whether N-type or P-type MOS tube. Type N is suitable for low-voltage side switches, while type P is suitable for high-voltage side switches. When selecting, the required rated voltage should be considered, and a voltage margin of 1.2 to 1.5 times is usually left to ensure protection and prevent MOS tube failure.

Then, determine the rated current of the MOS tube according to the circuit structure to ensure that it can withstand the maximum current under all circumstances. Consider the continuous conduction mode and the maximum current at the pulse spike, and calculate the conduction loss.

Consider thermal requirements, including the cooling requirements of the computing system and the ambient temperature. Consider the maximum junction temperature of the device and the thermal resistance between the semiconductor junction and the environment.

Choose the appropriate package form. Different packages have different limit currents, voltages and heat dissipation effects. Common packages include TO-3P, TO-247, TO-220, TO-220F, TO-251, TO-92, etc.

Finally, choose a reputable brand. The products of European, American and Japanese companies have excellent technology and performance, but the prices are higher. Companies in South Korea and Taiwan have advantages in price, while local companies in mainland China are competitive in the mid- to low-end market. Choosing the appropriate MOS tube requires comprehensive consideration of factors such as performance, cost, and reputation to ensure the best results in product design.