Will a dismissed charge as result of completing pretrial diversion show up in a background check?

I was offered a really great job, but the offer is contingent upon a pre-employment background check. I made a dumb mistake when I was 19, and received federal charges for it. Because I had never been in trouble before, I was allowed to enter pre-trial diversion. I paid a fine, and did community services, and the charges were dismissed. Will it show up in a background check? Do you think I should mention the situation to the potential employer before they do the check?