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IC替换查询：
以下是HD74LS221可替换型号：
  • 6300656
  • 178744
  • 74221
  • 74LS221
  • 74LS221CH
  • 74LS221J
  • 74LS221W
  • AMX3810
  • ECG74LS221
  • HD74LS221
  • HD74LS221P
  • M74LS221P
  • MB74LS221
  • MB74LS221M
  • N74LS221F
  • N74LS221N
  • NTE74LS221
  • POSN74LS221N
  • S4LS221N
  • SK74LS221
  • SN74LS221
  • SN74LS221J
  • SN74LS221JD
  • SN74LS221JDS
  • SN74LS221JS
  • SN74LS221N
  • SN74LS221ND
  • SN74LS221NDS
  • SN74LS221NS
  • SN74LS221W
  • TCG74LS221
  • TVSS4LS221N
  • VHIHD74LS221/
  • X420302210
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