This part is a kind of semiconductor called D1303.

Function of this product has NPN Transistors.

Manufacturers : FGX

Image and pinout :

Some of the text within the PDF file :

NPN Transistors ■■ APPLICATION：Audio Muting Applications. D1303 —NPN Silicon— ■■ MAXIMUM RATINGS（Ta=25℃） PARAMETER SYMBOL RATING UNIT Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current Base current Collector Power Dissipation VCBO VCEO VEBO Ic Ib Pc 25 V 20 V 12 V 0.3 A 0.03 A 0.4 W Junction Temperature Storage Temperature Range Tj 150 ℃ Tstg -55~150 ℃ ■■ ELECTRICAL CHARACTERISTICS（Ta=25℃，RG=10%） PARAMETER SYMBOL MIN. TYP. MAX. UNIT TEST CONDITION Collector-Base Breakdown Voltage BVcbo 25 V Ic=10uA Ie=0 Collector-Emitter Breakdown Voltage BVceo 20 V Ic=1mA Ib=0 Emitter-Base Breakdown Voltage BVebo 12 V Ie=10uA Ic=0 Collector Cut-off Current Icbo 0.1 uA Vcb=25V Ie=0 Emitter Cut-off Current Ieb [ ... ]

D1303 PDF Datasheet Download