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进口逻辑IC DM74LS221M SN74LS221DR 贴片SOP-16 质量保证
SN74LS221N PCM2704DBR BA16B-107G PCM2704DBR 74VHC153MX 9
MC3487D SN74LS221D CD74HCT40103M TS5V330D CD74ACT253M
CD74HCT109M SN74LS221DR TSM102ID CD74HC4049M CD74HC4049MT
贴片直插SN74LS240N,SN74LS221D,SN74LS169N,SN74LS175M,4
贴片直插SN74LS183N,SN74LS221M,SN74LS244N,SN74LS244H,4