Attached is a circuit I've had repeated success with.
I suggested the 2N7000 because of its availability, general utility and very low cost (about 0.11 USD in single quantities). It's been around a long time. Both the MTP3055V and MTP3055VL are also readily available and moderately priced (about 1.16 USD in single quantities).
I have to echo Paul's questions:
What kind of load are you driving?
What current capacity do you actually need?
How often will you be switching?
We could probably be a lot more helpful if we knew these things!





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