What does mpsa transistor mean?

i have a project that requires mpsa13 transistor but the local electronics shop only carries mpsa12 i don't know what is the difference between the two, what are some alternatives or do they have different names in different country. thanks in advance

They are both .625 watt NPN Darlington transistors However 13 is 30 volts and 0.5 amp and 12 is 20 volts 1.2 amp.

You can get the datasheets here:

http://www.maxim4u.com/

They are both .625 watt NPN Darlington transistors

However 13 is 30 volts and 0.5 amp and 12 is 20 volts 1.2 amp.

You can get the datasheets here:

http://www.maxim4u.com/

No problem:
MPSA13
Do the same for the MPSA12 ;)