STM32手册里一直有一种封装，但是我很少用，就是这种WLCSP封装。 可以简单对比一下。同样是48或者49脚，QFN封装的尺寸是7x7mm，而WLCSP只有3x3.2mm。

Elme Messer Gaas, joint venture of Estonian company BLRT and Messer Group of Germany, is about to set up an air separation plant for the production of liquefied gases in the territory of Special ...