Compare the 2sa641 with the BC556A (BU is Bulk vs. ta) on www.alltransistors.com. They are very close and the specs of the BC556A are just slightly higher.
Thanks Larry, I knew you would come through!...I did find this equivalent, but was hoping Fairchild had a match since I have a ton of theirs...oh well, time to order.
Thanks for the help.