Hello Eli,
Both TMP513 and TMP423 support 3 channel inputs. You can use 9 TMP432 and 4 TMP513 devices on an I2C bus. On the other hand TMP175 is a local temperature sensor where in you can connect upto 27 different devices.
Hope this is answers your question but please do let me know if have any more questions.
Regards,
Abhi