bc303The BC303 is a bipolar junction transistor (BJT) with an PNP-type confuration. That means the BC303 transistor has a negatively charged layer between two positively charged layers. ThisThe complementary NPN transistor to the BC303 is the BC301. Replacement and Equivalent for BC303 transistor You can replace the BC303 with the 2N5323 , BC161 or BC461 .