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丝印OPA643N OPA642U OPA642P OPA642N OPA642H
OPA642H
OPA640P OPA642PB OPA642H OPA671AP DIP8 BB运放IC =HXC
DIP封装CD4060BCN集成电路
新NL85721-50 74HC595MTC STM705AM6F OPA642N/3K T