以下是HD74LS21P可替换型号:
- 443-961
- 74LS21
- 74LS21DC
- 74LS21PC
- ECG74LS21
- GD74LS21
- HD74LS21
- HD74LS21P
- M74LS21P
- MB74LS21
- MB74LS21M
- N74LS21F
- N74LS21N
- NTE74LS21
- SK1920
- SN74LS21
- SN74LS21J
- SN74LS21JD
- SN74LS21JDS
- SN74LS21JS
- SN74LS21N
- SN74LS21ND
- SN74LS21NDS
- SN74LS21NS
- T74LS21B1
- T74LS21D1
- TCG74LS21
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