This part is a kind of semiconductor called BUL1688L.

Function of this product has NPN Silicon Power Transistor.

Manufacturers : SI Semiconductors

Image and pinout :

Some of the text within the PDF file :

SI SEMICONDUCTORS CO.,LTD. Product specification NPN SILICON POWER TRANSISTOR BUL1688L ●FEATURES: ■HIGH SWITCHING SPEED ■WIDE SOA ■COMPACT FLUORESCENT LAMP ● APPLICATIONS: SUITABLE FOR 110V CIRCUIT MODE: ■ELECTRONIC BALLASTS FOR FLUORESCENT LIGHTING ■SWITCH MODE POWER SUPPLIES ●MAXIMUM RATINGS（Tc=25°C） SOT-82 PARAMETER Collector-Base Voltage Collector-Emitter Voltage Emitter-Base Voltage Collector Current Total Power Dissipation Junction Temperature Storage Temperature SYMBOL VALUE UNIT VCBO VCEO VEBO IC PC Tj Tstg 400 250 9 8.0 60 150 V V V A W ●ELECTRICAL CHARACTERISTICS（Tc=25°C） CHARACTERISTIC Collector Cutoff Current Collector Cutoff Current Collector-Emitter Sustaining Voltage Base-Emitter Sustaining Voltage Collector-Emitter Saturation Voltag [ ... ]

BUL1688L PDF Datasheet Download