Greetings: I just replaced a power tranistor that is mounted on a motherboard. (N45H2A). It was replaced previously by the distributor of this motherboard. It ran for about 3 years and how it is out again. After replacing the tranistor I find it is running pretty hot. Can keep my finger on the heat sing for only about 3 seconds. I haven't been able to find (cross reference) this transitor with another one that will handle more current/power. A larger heat sink would be extremely difficult to install.
My question is, is it normal for such a transistor on a motherboard to run hot? I hope someone can come up with a solution to this problem. I don't trust hot transistors.