I have this component with the label "C33725" in my circuit:
http://i01.i.aliimg.com/photo/v0/479591199/NXP_IC_chip_C33725_in_stock.jpg
Is this a BC337 npn transistor or something else?

 

I think it is...

 

The devices are indeed identical -- The formal designation = BCC33725xx (where 'xx' represents 'place holders')

FWIW you may download a datasheet here:
http://www.alldatasheet.com/datasheet-pdf/pdf/643708/FAIRCHILD/BC33725BU.html

Best regards
HP

 

For sure you have BC337, from beta group 25.

 

Thank you very much! I was not sure because they omitted th "B".