This is a pretty generic part anyway but my TITS says the USA equivalent is 2N5818 EU equivalent is just listed as bc337
The only difference between them is the gain (Hfe) The -25 is listed as 160 and the -40 at 250
vcb=50v vce-45v veb=5vmax ic=800ma
depending on your application anything similar may well do the job.
If you need the full spec let me know