Why Are BJTs Considered Cheaper to Operate Than FETs?

[iScience]

why are people saying BJTs are cheaper to OPERATE?

the field effect devices require less current and should therefore cost less no?

 

[davenn]

what people ? where ?

any links to that ?

Dave

 

[RBTO]

The original statement is a lot like saying "Fords get better gas mileage than Chevys", without any other information provided. You can't make this type of comparison without talking about the type of circuit (the application), the type of BJT & FETs involved, and possibly several other things, so the statement itself has no merit.

Circuit design dictates transistor choice, and in some cases, BJTs may be the preferred transistor, while in others, FETs are a much better option (for any number of reasons but not usually "operating cost").

 

[jsgruszynski]

As others have said, you can not generalize. There are certain applications where BJTs are better while others where FETs are better. You have to talk about specifics of the application. And add into JFETs vs. MOSFETs vs. BJTs in analog circuits generally.

 

[alphy]

There are several factors that contribute to the perception that BJTs are cheaper to operate compared to FETs. One major factor is the manufacturing process. BJTs can be fabricated using simpler processes and materials, leading to lower production costs. Additionally, BJTs have a lower voltage drop and can operate at higher currents, making them more efficient and cost-effective in high-power applications.

Another factor is the market demand and availability. BJTs have been in use for a longer time and are more widely used in various electronic devices, resulting in a larger market and lower costs. On the other hand, FETs are relatively newer and have a smaller market, making them more expensive.

Furthermore, BJTs have a simpler structure and require fewer components, making them easier and cheaper to assemble and maintain. FETs, on the other hand, have a more complex structure and require more precise manufacturing techniques, leading to higher operational costs.

In conclusion, while FETs may require less current to operate, there are various factors that contribute to the perception that BJTs are cheaper to operate. However, it is important to consider the specific application and requirements when determining the most cost-effective option for a particular project.