This part is a kind of semiconductor called 2SK1058.

Function of this product has Silicon N-Channel MOS FET.

Manufacturers : Hitachi Semiconductor

Image and pinout :

Some of the text within the PDF file :

2SK1056, 2SK1057, 2SK1058 Silicon N-Channel MOS FET Application Low frequency power amplifier Complementary pair with 2SJ160, 2SJ161 and 2SJ162 Features • • • • • • • Good frequency characteristic High speed switching Wide area of safe operation Enhancement-mode Good complementary characteristics Equipped with gate protection diodes Suitable for audio power amplifier 2SK1056, 2SK1057, 2SK1058 Outline TO-3P D G 1 2 3 1. Gate 2. Source (Flange) 3. Drain S Absolute Maximum Ratings (Ta = 25°C) Item Drain to source voltage 2SK1056 2SK1057 2SK1058 Gate to source voltage Drain current Body to drain diode reverse drain current Channel dissipation Channel temperature Storage temperature Note: 1. Value at TC = 25°C VGSS ID I DR Pch* Tch Tstg 1 Symbol VDSX Ratings 120 140 160 [ ... ]

2SK1058 PDF Datasheet Download