When choosing an I2C switch, you might be curious as to why a PCA family switch has a TCA counterpart and vice versa.
The differences are the following:
1) TCA devices typically have lower supply voltage thresholds
2) TCA devices have corrected previous erratas found in the PCA devices.
3) TCA devices use newer process technologies which allows them to be more cost competitive than the PCA line up
4) TCA devices provide less strict supply voltage ramp times
Though, you can rest assured the following similarities exist between TCA and PCA families:
1) Pin to Pin (P2P) replacements (Please note that not all packages from the PCA line up made it into the TCA line up)
2) Addresses of responder devices and internal registers remain same