This is one of the semiconductor types. This part name is K30A.
This product has 2SK30A functions.
Manufacturers of product is Xiaosheng.
Image and pinout :
K30A PDF Datasheet
Some of the text files 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-off voltage Forward transfer admittamce Input capacitance (Common Source) Reverse transfer capacitance (Common Source) Conditions VDS = 10V, VGS = 0V VGS= -30V, VDS = 0V IG = -100μA，VDS = 0V VDS = [ … ]
Please refer to the file for details.