This part is a kind of semiconductor called 20NM60.

Function of this product has N-CHANNEL POWER MOSFET.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

STP20NM60-STP20NM60FP-STW20NM60 STB20NM60 - STB20NM60-1 N-CHANNEL 600V - 0.25Ω - 20A TO-220/FP/D²/I²PAK/TO-247 MDmesh™ MOSFET Table 1: General Features TYPE VDSS RDS(on) ID STP20NM60 STP20NM60FP STB20NM60 STB20NM60-1 STW20NM60 600 V 600 V 600 V 600 V 600 V < 0.29 Ω < 0.29 Ω < 0.29 Ω < 0.29 Ω < 0.29 Ω 20 A 20 A 20 A 20 A 20 A s TYPICAL RDS(on) = 0.25 Ω s HIGH dv/dt AND AVALANCHE CAPABILITIES s 100% AVALANCHE TESTED s LOW INPUT CAPACITANCE AND GATE CHARGE s LOW GATE INPUT RESISTANCE 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 characteristic [ ... ]

20NM60 PDF Datasheet Download