This part is a kind of semiconductor called 19N10V.
Function of this product has 100V N-Channel MOSFET.
Manufacturers : UNISONIC TECHNOLOGIES
Image and pinout :

Some of the text within the PDF file :
UNISONIC TECHNOLOGIES CO., LTD 19N10V 100V N-Channel MOSFET DESCRIPTION Power MOSFET The U TC 100V N-Chan nel enhancement mode po wer fiel d effect transistors (MOSFET) are pro duced by UTC’s plan ar stripe, DMOS techno logy which has bee n tail ored esp ecially in the avalanche an d commutation mode to min imize on-state re sistance, provide sup erior s witching p erformance, and withstand h igh en ergy pulse. T hey are suited for l ow voltage ap plications s uch as aud io amplifier, high efficiency switching DC/DC converters, and DC motor control. FEATURES * RDS(ON) = 0.1Ω @VGS = 10 V * Ultra low gate charge ( typical 19nC ) * Low reverse transfer Capacitance ( CRSS = typical 32pF ) * Fast switching capability * Avalanche energy Specified * Improved dv/dt capability, high [ ... ]
19N10V PDF Datasheet Download
