Transistor 2SC5149 is designed for different purpose.I look around two different
datasheets for 2SC4466 from SANYO and SANKEN.From futurelec.com You may
use 2SC3281, but may have problems. First necessity isolate collector from
heatsink.
Good luck from Riga!
That is 2SC4466, please note that Japanese transistors are always omitted "2S" in their number codes on packages. It is not MOSFET, but npn BJT.
You can get the datasheet from either following link:
**broken link removed** https://www.alldatasheet.com/datasheet-pdf/pdf/38005/SANKEN/2SC4466.html **broken link removed**
Knowing well about it, you can easily find out the replacement.
just write the number of transistor and the key word transistor in www.google.com
if didnt work search "datasheet" on google therell be thousands of datasheet searching engins available.