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芯片实物和规格书图片的差异



 你好,此型号是TPS79801QDGNRQ1,我想问下这个型号的实物底部,圈出来有四个延伸出来的角,但是规格书上的参考图,芯片的底部是标准的正方形,请问为什么会存在差异。