This part is a kind of semiconductor called 2SB1181.

Function of this product has Power Transistor.

Manufacturers : Kexin

Image and pinout :

Some of the text within the PDF file :

SMD Type Power Transistor 2SB1181 TO-252 +0.15 1.50 -0.15 Transistors Unit: mm 2.30 +0.8 0.50-0.7 +0.1 -0.1 Features Hight breakdown voltage and high current. Low VCE(sat). +0.2 9.70 -0.2 6.50 +0.2 5.30-0.2 +0.15 -0.15 +0.1 0.80-0.1 +0.15 0.50 -0.15 0.127 max 2.3 +0.15 4.60-0.15 +0.1 0.60-0.1 +0.28 1.50 -0.1 +0.25 2.65 -0.1 +0.15 5.55 -0.15 1 Base 2 Collector 3 Emitter Absolute Maximum Ratings Ta = 25 Parameter Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current Collector current pulse Collector power dissipation Collector power dissipation (Tc=25 ) Junction temperature Storage temperature Symbol VCBO VCEO VEBO IC ICP PC PC Tj Tstg Rating -80 -80 -5 -1 -2 1 10 150 -55 to +150 Unit V V V A A W W Electrical Characteristics Ta = 25 Parameter [ ... ]

2SB1181 PDF Datasheet Download