No, most coils outlast condensing units much of the time. sounds like you have just had some bad luck with this.
It does happen sometimes, but most of the leaks that I find are in the connection to the coil and the connection to the condensing unit.
I am assuming that the leak that you speak of is freon, not water from the condensate. If its a leak from the condensate, more than likely, it is from the coil bieng installed out of level. or a clog in the drain.
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