High voltage mosfet, transistor circuits, mosfet switch circuit, types of mosfet

 BSS138L Series 50 V 200 mA 225 mW SMT N-Channel Power Mosfet - SOT-23-3

https://www.futureelectronics.com/p/semiconductors--discretes--transistors--mosfets/bss138lt1g-onsemi-4159696