Question
hi, We have RS-485 with ST1480. we need 1kV surge protection. We use TVS and serie resistor in front-end. surge pulse higher then absolute rating. Will chip survive this. regards
When surge will be done the lab, they will surge at 1kV so every TVS can get (1000-31)/80 = 12A in theory. As 1A gives already 19V this is also above absolute ratings, 12A will be close to 28V.
absolute rating inpût is 14V. for a quality product: can the device safely accept this surge above absolute ratings without influencing lifetime of the chip or do we need to select another chip with a common mode with higher than the surge or is the surge no issue due to short time and/or the extra resistors of 10R.