This part is a kind of semiconductor called IXFN48N50U3.

Function of this product has HiPerFET Power MOSFETs.

Manufacturers : IXYS

Image and pinout :

Some of the text within the PDF file :

HiPerFETTM Power MOSFETs VDSS IXFN44N50U2 IXFN44N50U3 500 V IXFN48N50U2 IXFN48N50U3 500 V 3 4 ID (cont) 44 A 48 A RDS(on) trr 0.12 W 35 ns 0.10 W 35 ns 3 Buck & Boost Configurations for PFC & Motor Control Circuits 2 Preliminary data 2 4 1 1 Symbol VDSS VDGR VGS VGSM HiPerFET MOSFET Test Conditions TJ = 25°C to 150°C TJ = 25°C to 150°C; RGS = 1 MW Continuous Transient TC = 25°C TC = 25°C, pulse width limited by max. TJM TC = 25°C Repetitive IS £ IDM, -di/dt £ 100 A/ms, VDD £ VDSS, TJ £ 150°C, RG = 2 W TC = 25°C 44N50 48N50 44N50 48N50 Maximum Ratings 500 500 ±20 ±30 44 48 176 192 24 30 5 V V V V miniBLOC, SOT-227 B 1 2 4 ID25 IDM IAR EAR dv/dt A A A A A mJ V/ns 3 PD VRRM DIODE 520 600 W V A A W °C °C °C V~ V~ IFAVM IFRM PD TJ TJM [ ... ]

IXFN48N50U3 PDF Datasheet Download