Texas Instruments SN74LVC1T45DRLR is a part with limited availability, so it may help to find some alternatives with similar functionality. Unfortunately there isn’t a perfect cross-reference, so the options require you to compare the pros and cons of each for your particular application.
TXB0101DRLR and TXB0101DRLT are both decent options with the same device package, however, the data rate is lower at 100mbps.
The options listed in the following link match the other specifications well, but are offered in various device packages that differ from the original:
Translators, Level Shifters | Logic | Electronic Components Distributor DigiKey
Please review the datasheets to ensure the alternative will work for your application.