M74HC245B1
M74HC245B1R
M74HC245M1R
M74HC245RM13TR
M74HC245TTR
M74HC251B1R
M74HC251M1R
M74HC251RM13TR
M74HC251TTR
M74HC253B1R
010-61190909
19129911934(手机优先微信同号)