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CSD18537NQ5A: The difference of three Type`s Continuous Drain Current (ID)

Part Number: CSD18537NQ5A

Hello

It is a question about Power MOSFET Specification.

For Example, CSD18537NQ5A

Please see "Absolute Maximum Ratings" of datasheet page 1.

I want to know the difference of below 3 types ID.

I suppose that thermal dicipation is releted to below items.

Please advise how we treat below ratings for thermal dicipation caluculation.

1) Continuous Drain Current (Package limited)  : 50A

2) Continuous Drain Current (Silicon limited), Tc=25C : 55A

3) Continuous Drain Current : 11A

Thank you.