View 2sa1791 e datasheet:

Transistor 2SA1791 Silicon PNP epitaxial planer type For high-frequency amplification Unit: mm Complementary to 2SC4656 1.6± 0.15 0.4 0.8± 0.1 0.4 Features High transition frequency fT. Small collector output capacitance Cob. 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 –50 V Collector to emitter voltage VCEO –50 V Emitter to base voltage VEBO –5 V Collector current IC –50 mA 1:Base 2:Emitter EIAJ:SC–75 Collector power dissipation PC 125 mW 3:Collector SS–Mini Type Package Junction temperature Tj 125 ?C Marking symbol : AL Storage temperature Tstg –55 ~ +125 ?C E