Hi Kathirkamu annakamu,
MK20Dx128VLF5 is still active now, FRDM-K20D50M is no longer manufactured by NXP®; limited stock may be available through NXP distribution partners.
But you still can choose TWR-K20D50M, this board is still available.
MK20Dx128VLF5 is not the hot promotion product, it's recommended replacement chip is MK22DX128VLF5.
Wish it helps you!
If you still have question, please contact me!
Have a great day,
Kerry
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