This part is a kind of semiconductor called 6N90Z.

Function of this product has 900V N-CHANNEL POWER MOSFET.

Manufacturers : Unisonic Technologies

Image and pinout :

Some of the text within the PDF file :

UNISONIC TECHNOLOGIES CO., LTD 6N90Z Preliminary 6.2A, 900V N-CHANNEL POWER MOSFET  DESCRIPTION The UTC 6N90Z is an N-channel enhancement mode power MOSFET using UTC’s advanced technology to provide costumers with planar stripe and DMOS technology. This technology allows a minimum on-state resistance and superior switching performance. It also can withstand high energy pulse in the avalanche and commutation mode. The UTC 6N90Z is generally applied in high efficiency switch mode power supplies.  FEATURES * RDS(ON) < 2.3Ω @VGS = 10 V * Fast switching * 100% avalanche tested * Improved dv/dt capability  SYMBOL 1 1 Power MOSFET TO-220 TO-262  ORDERING INFORMATION Ordering Number Lead Free Halogen Free 6N90ZL-TA3-T 6N90ZG-TA3-T 6N90ZL-TQ2-T 6N90ZG-TQ2-T Note: Pin [ ... ]

6N90Z PDF Datasheet Download