2SD789-B Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 50 V
• Collector-Base Voltage, max: 100 V
• Emitter-Base Voltage, max: 6 V
• Collector Current − Continuous, max: 1 A
• Collector Dissipation: 0.9 W
• DC Current Gain (h_fe): 100 to 200
• Transition Frequency, min: 100 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92MOD

Here is an image showing the pin diagram of this transistor.The 2SD789-B transistor can have a current gain of 100 to 200. The gain of the 2SD789 will be in the range from 100 to 800, for the 2SD789-C it will be in the range from 160 to 320, for the 2SD789-D it will be in the range from 250 to 500, for the 2SD789-E it will be in the range from 400 to 800.Sometimes the "2S" prefix is not marked on the package - the 2SD789-B might only be marked "D789-B".The complementary PNP transistor to the 2SD789-B is the 2SB740-B.You can replace the 2SD789-B with the 2SC1384, 2SC2655, 2SC3243, 2SC3328, 2SC3940A, 2SD1207, 2SD1207-R, 2SD1347, 2SD1347R, 2SD1835, 2SD1835-R, 2SD667, 2SD667A, 2SD667AC, 2SD667C, 2SD863, 2SD863-E, KTC1008, KTC1008-Y, KTC3209, KTD863 or KTD863-Y.