This part is a kind of semiconductor called 2SK30A.

Function of this product has Silicon N-Cahannel FET.

Manufacturers : Xiaosheng

Image and pinout :

Some of the text within the PDF file :

Silicon Junction FETs XIAOSHENG Symbol: Drain LH03 Series of Products interconvert: 2SK30A Gate Source Silicon N-Chinnel Junction FET „ Application: For charge sensor, meter amplifier circuit, rheostat , chopper and gain controller for AGC ，electronic switch. Package example: „ Absolute Maximum Ratings (Ta=25℃) Parameter Gate to Drain voltage Gate to Source voltage Gate current Allowable power dissipation Junction Temperature Storage Temperature Symbol VGDO VGSO IG PD Tj Tstg Ratings -50 -50 10 250 125 -55 to +125 Unit V V mA mW ℃ ℃ * Package SC-59 SOT-23 TO-92S TO-92 TO-18 D S G 3 1 2 „ Electrical Characteristics (Ta=25℃) Prameter Symbol Drain to Source cut-off current Gate to Source leakage current Gate to Drain voltage Gate to Source cut-o [ ... ]

2SK30A PDF Datasheet Download