View 2sa1806 e datasheet:

Transistor 2SA1806 Silicon PNP epitaxial planer type For high speed switching Unit: mm 1.6± 0.15 0.4 0.8± 0.1 0.4 Features High-speed switching. Low collector to emitter saturation voltage VCE(sat). 1 SS-Mini type package, allowing downsizing of the equipment 3 and automatic insertion through the tape packing and the maga- zine packing. 2 Absolute Maximum Ratings (Ta=25?C) Parameter Symbol Ratings Unit 0.2± 0.1 Collector to base voltage VCBO –15 V Collector to emitter voltage VCEO –15 V Emitter to base voltage VEBO –4 V Peak collector current ICP –100 mA 1:Base 2:Emitter EIAJ:SC–75 Collector current IC –50 mA 3:Collector SS–Mini Type Package Collector power dissipation PC 125 mW Marking symbol : AK Junction temperature Tj 125 ?C Storage temperature Tstg –55 ~ +1