This part is a kind of semiconductor called W20NM60.

Function of this product has STW20NM60.

Manufacturers : ST Microelectronics

Image and pinout :

Some of the text within the PDF file :

www.DataSheet4U.net N-CHANNEL 600V - 0.26Ω - 20A TO-247 MDmesh™Power MOSFET TYPE STW20NM60 n n n n n n STW20NM60 VDSS 600V RDS(on) < 0.29 Ω ID 20 A TYPICAL RDS(on) = 0.26Ω HIGH dv/dt AND AVALANCHE CAPABILITIES 100% AVALANCHE TESTED LOW INPUT CAPACITANCE AND GATE CHARGE LOW GATE INPUT RESISTANCE TIGHT PROCESS CONTROL AND HIGH MANUFACTURING YIELDS 3 2 1 TO-247 DESCRIPTION The MDmesh™ is a new revolutionary MOSFET technology that associates the Multiple Drain process with the Company’s PowerMESH™ horizontal layout. The resulting product has an outstanding low on-resistance, impressively high dv/dt and excellent avalanche characteristics. The adoption of the Company’s proprietary strip technique yields overall dynamic performance that is significantly better than that [ ... ]

W20NM60 PDF Datasheet Download