Why should i go with Transistor Over the MOSFET ?

 The choice between a transistor (specifically a bipolar junction transistor, BJT) and a MOSFET (metal-oxide-semiconductor field-effect transistor) depends on several factors, including the application requirements, voltage levels, current levels, switching speed, power dissipation, cost, and other specific considerations. 

Here are some key factors to consider when selecting between a transistor and a MOSFET:

Voltage and Current Levels:

 MOSFETs typically excel in high-voltage and high-current applications. They have a lower on-resistance (RDS(on)) compared to BJTs, leading to reduced power dissipation and improved efficiency. MOSFETs are often preferred for power electronics applications, such as motor control, power supplies, and high-power amplifiers.

Switching Speed: 

MOSFETs have faster switching speeds compared to BJTs. They have a lower gate capacitance, enabling rapid charge and discharge cycles. This characteristic makes MOSFETs suitable for high-frequency applications, such as switching power supplies, RF amplifiers, and high-speed digital circuits.

Drive Requirements: 

BJTs require current drive to the base terminal for proper operation, while MOSFETs require voltage drive to the gate terminal. BJTs generally have a higher current gain (hFE or beta) compared to MOSFETs, making them suitable for applications where current amplification is necessary, such as audio amplifiers or low-level signal amplification stages.

Linearity: 

BJTs offer better linearity compared to MOSFETs. They have a more linear current-voltage characteristic, making them suitable for applications that require precise amplification of analog signals, such as audio amplifiers or voltage amplifiers in instrumentation.

Temperature Sensitivity: 

BJTs typically exhibit lower sensitivity to temperature variations compared to MOSFETs. MOSFETs may experience a significant increase in on-resistance (RDS(on)) with temperature, leading to increased power dissipation and reduced performance. BJTs are often preferred in high-temperature environments or when thermal management is challenging.

Cost: 

MOSFETs are generally more expensive than BJTs for low-voltage and low-current applications. However, for high-voltage and high-power applications, MOSFETs can provide cost advantages due to their improved efficiency and reduced heat dissipation requirements.

It's important to note that both BJTs and MOSFETs have their unique advantages and considerations. The selection process should involve evaluating the specific requirements of the application, including voltage and current levels, switching speed, linearity, temperature sensitivity, cost constraints, and other relevant factors. Additionally, datasheets and application notes provided by manufacturers should be consulted for detailed specifications and performance characteristics of specific transistor or MOSFET devices.