• Type: NPN
• Collector-Emitter Voltage, max: 140 V
• Collector-Base Voltage, max: 140 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 10 A
• Collector Dissipation: 100 W
• DC Current Gain (h_fe): 55 to 160
• Transition Frequency, min: 30 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-3P

Here is an image showing the pin diagram of this transistor.

The 2SC5198 transistor can have a current gain of 55 to 160. The gain of the 2SC5198R will be in the range from 55 to 100, for the 2SC5198O it will be in the range from 80 to 160.