MIC39500-1.8BU MIC39500-1.8BU TR MIC39500-1.8BU 内存芯片 MIC39500-1.8WT MIC39500-1.8WU MIC39500-1.8WU TR MIC39500-1.8WU-TR MIC39500-2.5BT MIC39500-2.5BU MIC39500-2.5BU TR