Welcome, @SPist.1, to the community!
In the current market situation, it is very difficult to name alternatives. For example, you have not mentioned which parameters of the MOSFET are important or absolutely necessary for you or for which application the MOSFET is used. But based on the parameters of the STP20NK50Z, I have selected a few types for you - please check for yourself whether they are available:
Our eStore should at least have the STP36N60M6 in stock at the moment.
Before you order, you should check again whether the important parameters fit your application.
If the problem is resolved, please mark this topic as answered by selecting Select as best. This will help other users find that answer faster.
Good luck!
/Peter
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