Thanks a lot Osamu Yves > Hello Yves, > > I think this site would give you sufficient info for you. > > http://homepage3.nifty.com/ebina2540/data/2SC/2SC2201-2300.htm > > As for 2SC2291, > > Mnf. (Manufacturer) is Mitsubishi, > App. (Application) is constant current source and active load. > > Sam Hoshuyama > Saitama, JAPAN