I am looking at I2C bus temperature sensors and I have found a couple. The TI TMP101 comes in a SOT23 package and has a tristate pin for address selection with an ALERT output. But this part is being used here on a new design and they are having a problem with it correctly responding to the right address when the address pin is left open. We don't know if this is because of excessive circuit noise or if the chip is overly sensitive.
I also found a National LM73 which seems to be a very similar part in the same package, but with a different pinout. It also has the same tri-state pin for address selection. Anyone know if this part would have the same problem?
Of course I don't know if our bad experience is because of the design or the chip, that is why I am asking here is anyone else has seen the same problem or has used these parts successfully.