TVS breakdown voltage
Hello,
is the breakdown voltage of a TVS (e.g. SMAJ5.0A) a guaranteed value?
Background: I whish to protect a circuit from overvoltages on the 5V supply which can be normally range from 4.4V to 6V. AN316 would then suggest to use a SMAJ6.0A or better 6.5A as it says, that the maximum operating voltage should be below the Vrm voltage.
But if I read the datasheet right, the Vbr voltage states a minimum (tested?) voltage at which the reverse current reaches / exceeds 1mA.
If I want to have the protection level as low as possible, I would prefer the SMAJ5, as it has a VBr of 6.4V. I know, if my supply goes up to 6V that I get a higher reverse current, which I can to tolerate. But I would expect, that this current is not higher than the test current of 1mA for the Vbr and therefore the dissipated power in the TVS should well below 10mW. Does an elevated voltage near to the breakdown voltage cause problems over time?