FET Substitution Or Replacement Secrets.

Finding the right transistor fet substitution is important if you want the equipment you repair to last longer. Electronic repairers who perform switch mode power supply repair quite often frustrated because they could not find the original part number and to add things worst they also could not find the right fet replacement or substitution.

Without a new fet, the power supply would not work. If you repair any latest model of equipment, you will definetely have difficulty to get the original part number because the parts that you are searching haven’t arrived to your country yet.

You have searched electronic supplier from the internet and they don’t carry such a new stock. In most electronic repair courses, you are taught to replace only with original numbers when comes to replace the power supplies components especially the mosfet or fet. Did you know that, you actually can locate a replacement part number other than the original number? Sometimes the replacement part number will even work better than the original one! Taking computer monitor power supply repair as an example, I’ll explain how this replacement can be done.

A K1118 Mosfet Transistor 

There are a lot of different types of fet part number used in monitor power supplies. If I were to keep each different fet part number in a component's rack, I think I will need dozens of them and is a waste of money and time to arrange them in the rack! To tackle this problem, I begin to do some research on each of the different mosfet. What I found in common on those fet ratings are the voltage, ampere, wattage and the ohms value.

The results that I compiled made me found a universal number that can fit into all 14" and 15" monitor switch mode power supply. The universal mosfet part numbers that I discovered is K1118 or 2SK1118 (JAPANESE TRANSISTOR CODE). If any brands or models of 14" and 15" monitor came in for repair with no power problem and with a failure in fet, I just replace the original fet part number with K1118. This method not only solves the power supply problem, it also helps me to save my time and hassle in finding the original part number.

Whether you are in Monitor repair, TV repair or any other equipment repair, I strongly suggest that you do your homework and spend more time in doing research by comparing each fet data and hope to find a universal part number for the equipment that you are working on it. Times are saved due to the speed of repair especially in easily finding the right fet substitution. The mosfet cross reference you can either get it from the transistor replacement book or search from the internet.

A Power FET In Switch Mode Power Supply