2sd2100.pdf datasheet:

Ordering number:EN3176APNP/NPN Epitaxial Planar Silicon Transistors2SB1397/2SD2100Compact Motor Driver ApplicationsFeatures Package Dimensions Low saturation voltage.unit:mm Contains diode between collector and emitter.2038 Contains bias resistance between base and emitter.[2SB1397/2SD2100] Large current capacity. Small-sized package making it easy to provide high-density, small-sized hybrid ICs.E : EmitterC : CollectorB : Base( ) : 2SB1397SANYO : PCP(Bottom view)SpecificationsAbsolute Maximum Ratings at Ta = 25CParameter Symbol Conditions Ratings UnitCollector-to-Base Voltage VCBO ()25 VCollector-to-Emitter Voltage VCEO ()20 VEmitter-to-Base Voltage VEBO ()6 VCollector Current IC ()2 ACollector Current (Pulse) ICP ()4 ACollector Dissipation PC Mounted on ceramic board (250mm2 0.8mm) 1.3 WC