以下是9H21PC可替换型号:
- 1479-0257
- 1741-1299
- 569-0881-821
- 74H21PC
- 829704-6
- 829704-7
- 9H21DC
- 9H21PC
- DM74H21J
- ECG74H21
- ITT74H21N
- MB614
- MC3011P
- N74H21A
- N74H21F
- NTE74H21
- SN74H21
- SN74H21J
- T74H21B1
- T74H21D1
- T74H21D2
- UPB233C
- UPB233D
- US74H21A
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