Marking of electronic components, SMD Codes ALS640B, ALS640B**. SN74ALS640BDW, SN74ALS640BNSR, SN74ALS640B-1DW, SN74ALS640B-1NSR, ic marking code.
| PartNumber | Marking code | Manufacturer | Package |
|---|---|---|---|
| SN74ALS640BDW | ALS640B | SOIC-20W | |
| SN74ALS640BNSR | ALS640B | SOP-20 | |
| SN74ALS640B-1DW | ALS640B1 | SOIC-20W | |
| SN74ALS640B-1NSR | ALS640B1 | SOP-20 |