SN74HCT540DW
SN74HCT540DWE4
SN74HCT540DWG4
SN74HCT540DWR
SN74HCT540DWRE4
SN74HCT540DWRG4
SN74HCT540N
SN74HCT540NE4
SN74HCT541AN
SN74HCT541ANE4
19129491934(手机优先微信同号)