This part is a kind of semiconductor called 2SC2812.
Function of this product has Silicon NPN transistor.
Manufacturers : BLUE ROCKET ELECTRONICS
Image and pinout :
Some of the text within the PDF file :
2SC2812 Rev.E Mar.-2016 DATA SHEET 描述 / Descriptions SOT-23 塑封封装 NPN 半导体三极管。Silicon NPN transistor in a SOT-23 Plastic Package. 特征 / Features 低频率。 Low fT. 用途 / Applications 用于普通低频放大。 Low frequency general-purpose amplifier applications. 内部等效电路 / Equivalent Circuit 引脚排列 / Pinning 3 2 1 PIN1：Emitter PIN 2：Base PIN 3：Collector 放大及印章代码 / hFE Classifications & Marking hFE Classifications Symbol hFE Range 4 90～180 5 135～270 Marking L4H L5H 6 200～400 L6H 7 300～600 L7H http://www.fsbrec.com 1/6 2SC2812 Rev.E Mar.-2016 DATA SHEET 极限参数 / Absolute Maximum Ratings(Ta=25℃) 参数 Parameter Collector to Base Voltage Collector to Emitter Voltage Emitter to Base [ ... ]