p2p alternative to ADI AD7689BCPZRL7 (8ch ADC, 250ksps 16-bit)

Hello Josef, 

Unfortunately we do not have a pin to pin drop in device. 

I did a quick parametric search, only limiting by resolution and mux 8 channels,  nd found 10 resulting devices -click here-

Looking at the device functionality I would suggest the ADS8166-click here- as the closet device to same functionality. Also the slightly newer ADS7066 -click here-  note the package for this device is very small. 

Hope this helps, please reach out if the customer is looking to switch 

Cynthia