This part is a kind of semiconductor called P1203BV.
Function of this product has N-Channel Enhancement Mode MOSFET.
Manufacturers : UNIKC
Image and pinout :
Some of the text within the PDF file :
P1203BV N-Channel Enhancement Mode MOSFET PRODUCT SUMMARY V(BR)DSS 30V RDS(ON) 12mΩ @VGS = 10V ID 11A SOP- 08 ABSOLUTE MAXIMUM RATINGS (TA = 25 ° C Unless Otherwise Noted) PARAMETERS/TEST CONDITIONS Drain-Source Voltage Gate-Source Voltage Continuous Drain Current2 Pulsed Drain Current Avalanche Current Avalanche Energy Power Dissipation 1,2 http://www.DataSheet4U.net/ SYMBOL VDS VGS LIMITS 30 ±20 11 7 40 28 40 2.5 1 -55 to 150 UNITS V TA = 25 ° C TA = 100 ° C ID IDM IAS A L = 0.1mH TA = 25 ° C TA = 100 ° C EAS PD TJ, TSTG mJ W ° C Operating Junction & Storage Temperature Range THERMAL RESISTANCE RATINGS THERMAL RESISTANCE Junction-to-Case Junction-to-Ambient 1 2 SYMBOL RqJC RqJA TYPICAL MAXIMUM 25 50 UNITS ° C/W Pulse width limited by maximum junction temperatur [ ... ]