AT27C2048-15PI AT27C2048-15VC AT27C2048-15VI AT27C2048-55JC AT27C2048-55JI AT27C2048-55JI(KIT5080-2573) AT27C2048-55JU AT27C2048-55JU 其他被动元件 AT27C2048-55JU-T AT27C2048-55PC