正品DM74ALS00AMX DM74ACT521SJ DM74ACT374PC DM74ACT373SC

贴插DM74F161ASJX-DM74ACT521SJ-DM74F151ASJX-B

新贴片直插218N04ZZA05G，DS90LV031ATM，DM74ACT521SJ，6

新贴片直插DM74ALS240WM，DM74ACT521SJ，DM74ALS00AMX，6