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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