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Marking of electronic components, SMD Codes HC640, HC640**. SN74HC640DW, SN74HC640NSR, SN74HC640PW, CD74HC640M, ic marking code.
| PartNumber | Marking code | Manufacturer | Package |
|---|---|---|---|
| SN74HC640DW | HC640 | SOIC-20W | |
| SN74HC640NSR | HC640 | SOP-20 | |
| SN74HC640PW | HC640 | TSSOP-20 | |
| CD74HC640M | HC640M | SOIC-20W |