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Marking of electronic components, SMD Codes HC21, HC21**. SN74HC21D, SN74HC21NSR, SN74HC21PW, CD74HC21M, SN74HC21QDRQ1, ic marking code.
| PartNumber | Marking code | Manufacturer | Package |
|---|---|---|---|
| SN74HC21D | HC21 | SO-14 | |
| SN74HC21NSR | HC21 | SOP-14 | |
| SN74HC21PW | HC21 | TSSOP-14 | |
| CD74HC21M | HC21M | SO-14 | |
| SN74HC21QDRQ1 | HC21Q | SO-14 | |
| SN74HC21QPWRQ1 | HC21Q | TSSOP-14 |