常用芯片QFN类封,装PCB封装库（AD库，封装带3D视图）Altium Designer的PCB封装库，.PcbLib格式的，带3D视图，非常实用。详细封装型号如下：Component Count : 14 Component Name ----------------------------------------------- QFN 5X7 QFN12 3x3 QFN16 3x3 QFN16 4x4 QFN20 4x4 QFN24 4x4 QFN28 4X4 UFQFN QFN28 5x5 QFN32 5x5 QFN40 6X6 QFN48 6X6 QFN48 7X7 QFN64 9x9 QFN68 8x8