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HMC751LC4 / HMC963LC4 Heat sink recommendations

Hi,

I just received two evaluation boards of the RF amplifiers HMC751 and HMC963. They didn't come with any heat sink attached but in the datasheet I read "The evaluation board should be mounted to an appropriate heat sink". Is it totally necessary? If it is, are there specific models of heat sinks that I can buy for such small boards?

Many thanks in advance.

All the best,

Pascual