Part 2SC1815GRTE2FT from Toshiba is a bipolar transistor not carried by DigiKey.
DigiKey part number KSC1815YTACT-ND is an option to look at as a possible alternative.
To verify this part will work in your application or to view full specifications see the manufacturer datasheet for part KSC1815YTACT-ND.
Please review the datasheets to ensure the alternative will work for your application.