This part is a kind of semiconductor called 2SK4058.

Function of this product has MOS FIELD EFFECT TRANSISTOR.

Manufacturers : NEC

Image and pinout :

Some of the text within the PDF file :

DATA SHEET MOS FIELD EFFECT TRANSISTOR 2SK4058 SWITCHING N-CHANNEL POWER MOSFET DESCRIPTION The 2SK4058 is N-channel MOSFET device that features a low on-state resistance and excellent switching characteristics, and designed for low voltage high current applications such as DC/DC converter with synchronous rectifier. FEATURES • Low on-state resistance RDS(on)1 = 8.0 mΩ MAX. (VGS = 10 V, ID = 24 A) • Low QGD: QGD = 6.5 nC TYP. • 4.5 V drive available ORDERING INFORMATION PART NUMBER 2SK4058(1)-S27-AY Note 2SK4058-ZK-E1-AY Note 2SK4058-ZK-E2-AY Note PACKAGE TO-251 (MP-3-b) TO-252 (MP-3ZK) TO-252 (MP-3ZK) Note Pb-free (This product does not contain Pb in external electrode.) ABSOLUTE MAXIMUM RATINGS (TA = 25°C) Drain to Source Voltage (VGS = 0 V) VDSS 25 Gate to Source [ ... ]

2SK4058 PDF Datasheet Download