Understanding Transistor Data and Replacement/Equivalent

If, for some reason, you cant get an exact replacement for the transistor that you want to replace, you can refer to one of the transistor substitution guides or book, and try to identify a near replacement. Beware, however. A substitution guide will sometimes list a replacement for your part, even though the two parts are not very similar. The most commonly used transistor substitution guides is the Philips ECG semiconductors Master Replacement Guide. Selecting the right transistor parameters or specifications for the equipment you repair will avoid callbacks from customers. Callbacks or repeated repairs due to wrong transistor substitution will cost you extra money and a waste of time.

Some important transistor parameters are:

Below is a table of application requirement and important specification that you can use for guidelines when comes to transistor substitution.

Remember, the replacement transistor should not run hot and if problem still persist, try another replacement number or get the original number if possible. Do not overlook that the surrounding components also may caused the transistor to run hot even if original number is used.

Author By : Jestine Yong, he is a electronic repairer and a writer. For more information on electronic repair please visit his website at : http://www.noahtec.com/electronic-repair-articles.htm