Dear support team
Do you have any data of voltage surge tolerance of INA 225-Q1 IN+ and IN-?
For example, will INA225-Q1 endure when square pulse of -5V/100us apply to it?
(It is not necessary to guarantee it)
If it cannot endure,What kind of measures should I take using external components?
Regards
Tomohiro Nagasawa
A surge of voltage below (GND - 0.3V) exceeds the maximum ratings for the device so it will likely not work. The problem is that it is very hard to protect with a level of just -0.3V. We found some diode-connected FETs might work. See this thread: 
for an example of how this problem was addressed by another customer. It's a tough problem with no real good solution but this can help. Will the surge current be a lot or just a little? The breakdown voltage of the MOSFET can exceed -0.3V if you apply too much current to it.
Let me know if you have any questions.
