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AntoJijoKICKU/Smart_PLUG
This is Untested version of Hardware Double check your guts before take this as reference
STMicroelectronicsExtended
-65℃~+150℃ 1 NPN 1.5A 100nA 15V 200 500mW 5V 850mV NPN SOT-23 Bipolar (BJT) ROHS
The 2STR1215 is a bipolar made by STMicroelectronics in a SOT-23 package with 3 pins. -65℃~+150℃ 1 NPN 1.5A 100nA 15V 200 500mW 5V 850mV NPN SOT-23 Bipolar (BJT) ROHS.
PCBKit's library has its KiCad symbol (Pinmap_Generic:Q_NPN_1B_2E_3C, from PCBKit's generic symbols) and its footprint (Package_TO_SOT_SMD:SOT-23, from KiCad's library), ready for a KiCad board. 1 are in stock at JLCPCB (part C2935151). 1 open-source board in 1 repository on GitHub use it.
The library has no symbol for this part yet.
The library has no footprint for this part yet.

AntoJijoKICKU/Smart_PLUG
This is Untested version of Hardware Double check your guts before take this as reference
Yes. The symbol is Pinmap_Generic:Q_NPN_1B_2E_3C and the footprint Package_TO_SOT_SMD:SOT-23, both drawn on this page. PCBKit places them on a board for you when you design with it.
SOT-23, with 3 pins. Its footprint is drawn on this page.
STMicroelectronics publishes it: the Datasheet link on this page opens it.
JLCPCB lists it as part C2935151, with 1 in stock; the sellers' links on this page open their listings.
Parts like it in the library: the 8550M-D by Foshan Blue Rocket Elec, the SS8550 by MSKSEMI, the S8550 2TY-TD(0.35) by TDSEMIC and the SS8050 Y1-TD(0.4) by TDSEMIC. Check their datasheets: a part that fits the footprint may still differ in its ratings.
1 board in 1 repository on GitHub; the most starred are listed on this page, with their KiCad files.