This part is a kind of semiconductor called 2SK3577.

Function of this product has Switching N-Channel Power MOS FET.

Manufacturers : NEC Electronics

Image and pinout :

Some of the text within the PDF file :

DATA SHEET MOS FIELD EFFECT TRANSISTOR 2SK3577 N-CHANNEL MOS FIELD EFFECT TRANSISTOR FOR SWITCHING DESCRIPTION The 2SK3577 is a switching device which can be driven directly by a 2.5 V power source. The device features a low on-state resistance and excellent switching characteristics, and is suitable for applications such as power switch of portable machine and so on. PACKAGE DRAWING (Unit: mm) 0.4 +0.1 –0.05 0.16+0.1 –0.06 0.65–0.15 +0.1 2.8 ±0.2 3 1.5 FEATURES • 2.5 V drive available • Low on-state resistance RDS(on)1 = 63 mΩ MAX. (VGS = 4.5 V, ID = 2.0 A) RDS(on)2 = 65 mΩ MAX. (VGS = 4.0 V, ID = 2.0 A) RDS(on)3 = 91 mΩ MAX. (VGS = 2.5 V, ID = 2.0 A) 0 to 0.1 1 2 0.95 0.95 0.65 0.9 to 1.1 1.9 2.9 ±0.2 ORDERING INFORMATION PART NUMBER 2SK3577 PACKAGE SC-9 [ ... ]

2SK3577 PDF Datasheet Download