This part is a kind of semiconductor called 2SK508.

Function of this product has N-CHANNEL JFET.

Manufacturers : Unisonic Technologies

Image and pinout :

Some of the text within the PDF file :

UNISONIC TECHNOLOGIES CO., LTD 2SK508 HIGH FREQUENCY AMPLIFIER N-CHANNEL SILICON JUNCTION FIELD EFFECT TRANSISTOR N-CHANNEL JFET 3  DESCRIPTION The UTC 2SK508 is NPN transistor with High forward transfer admittance and low input capacitance. It is suitable for cordless telephone, AM tuner and wireless installation, etc.  FEATURES * High forward transfer admittance * Low input capacitance  ORDERING INFORMATION Ordering Number 2SK508G-x-AE3-R Note: Pin Assignment: D: Drain S: Source G: Gate Package SOT-23 1 2 SOT-23 (JEDEC TO-236) Pin Assignment 123 DSG Packing Tape Reel  MARKING www.unisonic.com.tw Copyright © 2014 Unisonic Technologies Co., Ltd 1 of 3 QW-R206-101.C 2SK508 N-CHANNEL JFET  ABSOLUTE MAXIMUM RATINGS (TA=25°C, unless otherwise specified) PARAMETE [ ... ]

2SK508 PDF Datasheet Download