Thanks, all. I see there's a PHL flight that arrives at 620a as well.
It looks like 60 minutes is the MCT for a T5-T5 international connection.
My experience is that a one-hour connection should not be an issue, even if one comes in to the B or C concourse (obviously subject to a close-to-on-time arrival). Do others agree? I'll be traveling in J or F, so close to first off the aircraft and entitled to fast track security.