Application: Frequently utilized in various types of signal amplification and electronic switch applications. Basic Transistor Bjt at Kai Haddon blog TO-92 BJT Transistor 2N3904 2N3906 2N2222 2N5401 2N5551 A1015 C1815 C945 S8050 S8550 S9012 S9013 S9014 S9015 S9018 I.187266709 Transistor Polarity: NPN type BJT, ideal for a wide range of applications. NPN Transistor TRANSISTOR, NPN, TO-247, Single Bipolar Junction Transistors (BJT Signal Amplification Transistor 50PCS BC547 NPN & BC557 PNP Transistor Assortment Kit - 50V 100mA TO-92 Transistors (25PCS BC547 25PCS BC557) - Ideal for Electronics Projects & Repair Transistor Type: High-performance NPN Bipolar Junction Transistor.