NPN Small Signal Transistor, bjt as a switch, types of transistor, mosfet as a switch

 PUMH9 Series 50 V 100 mA Surface Mount NPN Small Signal Transistor - SOT-363

https://www.futureelectronics.com/p/semiconductors--discretes--transistors--bipolar-transistors/pumh9-115-nexperia-2016607