This part is a kind of semiconductor called STR-A6351.

Function of this product has STR-A6300 Series.

Manufacturers : SanKen

Image and pinout :

Some of the text within the PDF file :

STR-A6300 Application Notes （Ver.1.2） STR-A6300 Series Application Notes(Ver. 1.2) May 15th, 2002 System Engineering Dept. Semiconductor Operations Sanken Electric Co., Ltd. Page 1 STR-A6300 Application Notes （Ver.1.2） CONTENTS 1. INTRODUCTION 2. FEATURES 3. LINE-UP OF STR-A6300 SERIES 4. OUTLINE DRAWINGS 5. BLOCK DIAGRAM 6. ELECTRICAL CHARACTERISTICS 7. FUNCTIONS OF EACH TERMINAL AND OPERATION 8. CALCULATION OF PRIMARY INDUCTANCE 9. DESIGN GUIDELINES 3 3 4 5 6 7~8 8~14 14 14~17 *Specifications and information herein are subject to change without notice. Page 2 STR-A6300 Application Notes （Ver.1.2） 1 INTRODUCTION STR-A6300 series is a hybrid IC with a built-in power MOSFET and a controller IC, designed for fly-back converter type SMPS(Switching Mode Power Supply) ap [ ... ]

STR-A6351 PDF Datasheet Download