BS170PSTOB

The BS170PSTOB is a single MOSFET from the metal-oxide semiconductor field effect transistor (MOSFET) family. It is a commonly used MOSFET for low-frequency power supplies, such as in then computers and other electronic equipment. Its functionality is based on the principle of four-terminal gate control, and combined with its highly efficient switching characteristics, it has become a highly sought-after component in the electronic industry.

Application field

The most common application of the BS170PSTOB is as a switch in power supplies. A low-frequency power supply typically consists of a FET, an inductor, and a capacitor, with the FET serving as the main switch. The MOSFETs are renowned for their low ‘on’ resistance and high efficiency, making them the perfect choice for such power supplies. The power source is connected to the positive and negative terminals, while the load is connected to the main drain and source terminals.

In addition to power supplies, the BS170PSTOB is also used in audio electronics where low-level signals need to be amplified. The MOSFETs can amplify signals more efficiently than standard transistors, providing superior sound with minimal distortion. As such, it has become synonymous with high-end audio amplifiers.

The BS170PSTOB is also used in automotive electronics, allowing for reliable power distribution to the car’s electrical system. Furthermore, it can be used as a temperature sensor, with its highly responsive switching characteristics providing an ideal platform to detect sudden changes in temperature.

Working Principle

When the BS170PSTOB is under operation, it functions as a three-state switch. The main terminals of the MOSFET are the gate, drain, and source. When a positive voltage is applied to the gate, it causes the drain to become positively charged. This results in a launch of electrons from the source to the drain, creating a closed conducting channel.

When this conducting channel is activated, it lays the foundation for lesser resistance between the source and the drain. This effectively bypasses the high resistance of the OFF state, allowing the current to flow with minimal resistance. When the gate voltage is removed, the MOSFET reverts back to its OFF state and the current flow ceases.

The BS170PSTOB is well-renowned for its low gate capacitance, allowing for more efficient switching of current. Additionally, its low on-state resistance causes less of a voltage drop and reduces heat dissipation. This makes it ideal for power supplies where loss of power needs to be kept to a minimum.