Not really. ECM blasts are focused beams. Plus these platforms are supposed to be flying behind fighter/SEAD aircraft. By the time they are within the engagement envelope, the threat should already be neutralized.And even then, you become the brightest Christmas ornament on the tree and every missile is now pointed at you.
This is why aligning all the vectors of your fighter/strike/SEAD packages with with ECM aircraft and the threats is so critical. When done properly, the ECM platforms should be untouchable when you pick your fights wisely...
On the other hand, if you suddenly get flanked by a 5th gen Raptor/J-20, which pops up out of nowhere to splash your ECM... or it turns out the opponent's ECCM is better than your ECM... well, then you picked the wrong fight and now you're gonna die. Merry Xmas.