贴片直插SN74LS183N，SN74LS221M，SN74LS244N，SN74LS244H，4

SN74LS221N PCM2704DBR BA16B-107G PCM2704DBR 74VHC153MX 9

MC3487D SN74LS221D CD74HCT40103M TS5V330D CD74ACT253M

CD74HCT109M SN74LS221DR TSM102ID CD74HC4049M CD74HC4049MT

进口逻辑IC DM74LS221M SN74LS221DR 贴片SOP-16 质量保证

贴片直插SN74LS240N，SN74LS221D，SN74LS169N，SN74LS175M，4