Add GaN_Systems_GaNPX-3_5x6.6mm
Hi,
I'd like to add the footprint for the GS66502B GaN-HEMT (https://gansystems.com/wp-content/uploads/2020/04/GS66502B-DS-Rev-200402.pdf).
@johnbeard you did a great review for !3082 (merged). Since this one is similar, could you please conduct it?
Corresponding symbol: Let's wait until !3815 will be merged, I will create an alias then.