Wednesday, November 30, 2011

Basic Advantages Of Film Type Resistors

By Peter Enmore


Nowadays resistors vary depending on their resistive element. For instance, it is possible to find a resistive element that is manufactured from bulk material. Wirewound ones, metal-strip, carbon composition and foil ones have this specific element. There is also a so-called film resistive element that is associated with the majority of modern types. Understanding the main advantages of film type resistors is very important for everyone who wants to make the right choice.

It should be mentioned that these can be metal/metal oxide and carbon. Each of these types has some particular characteristics. Of course, every electronics constructor should take them into consideration.

There are numerous reasons to make metal products your perfect choice. Their great stability is definitely one of them. The point is that high stability is required in a great variety of applications.

It should be also mentioned that metal ones can offer lower temperature coefficient in comparison to other types of resistor. Besides that, the tolerance is only about one percent. Another plus of these is that they provide a bit lower level of noise.

You may also think of choosing carbon ones as well. They have many advantages as well. This carbon type of resistor can provide you with a variety of resistances. Its operating temperature is very high (from 55 degrees Celsius to 155 degrees Celsius). The range of its maximum working voltage is 600 volts. Using carbon products also helps to prevent outgassing.

All electronics constructors pay attention to electronic noise. The point is that thermal noise is fundamental to resistance, and this factor should be taken into consideration. The best thing about modern carbon ones is that they can provide less of thermal noise than the others.

It should be also noted that there are thin and thick film kinds. The important difference between them is a level of noise. The matter is that thick ones offer a much greater noise level than thin ones. This noise level is 10-100 times greater. Among the advantages of a thick resistor is the widest range of values. Besides that, they are much cheaper than the thin products. If to point out the benefits of using thin film resistor, high stability and a possibility of miniaturization should be mentioned.

These types of resistors have some disadvantages as well. For some applications, they may seem less important than all the advantages of film type resistors. However, each of such disadvantages should be considered to make the best choice on what will work the best and last the longest.




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