Yes, most digital logic outputs are not purely ground. The are guaranteed to be within a certain range close to 0, usually 0.2 v which is typical VCE of a saturated transitor. For your application, the lowest Rds FET you can find would work best. Also make sure it can be controlled by a 5VDC signal. Like a BSS138LT or Si4410BDY or IRLL014N.