View 2sa1738 e datasheet:

Transistor 2SA1738 Silicon PNP epitaxial planer type For high speed switching Unit: mm +0.2 2.8 –0.3 +0.25 Features 0.65± 0.15 1.5 –0.05 0.65± 0.15 High-speed switch (pair with 2SC3757) Low collector to emitter saturation voltage VCE(sat). 1 Mini type package, allowing downsizing of the equipment and automatic insertion through the tape packing and the magazine 3 packing. 2 Absolute Maximum Ratings (Ta=25?C) Parameter Symbol Ratings Unit 0.1 to 0.3 Collector to base voltage VCBO –15 V 0.4± 0.2 Collector to emitter voltage VCEO –15 V Emitter to base voltage VEBO –4 V Peak collector current ICP –100 mA 1:Base JEDEC:TO–236 2:Emitter EIAJ:SC–59 Collector current IC –50 mA 3:Collector Mini Type Package Collector power dissipation PC 200 mW Junction temperature Tj 15