2SD439-D Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 18 V
• Collector-Base Voltage, max: 20 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 1.2 A
• Collector Dissipation: 8 W
• DC Current Gain (h_fe): 60 to 120
• Transition Frequency, min: 150 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-126

Here is an image showing the pin diagram of this transistor.The 2SD439-D transistor can have a current gain of 60 to 120. The gain of the 2SD439 will be in the range from 60 to 320, for the 2SD439-E it will be in the range from 100 to 200, for the 2SD439-F it will be in the range from 160 to 320.Sometimes the "2S" prefix is not marked on the package - the 2SD439-D might only be marked "D439-D".The complementary PNP transistor to the 2SD439-D is the 2SB559-D.You can replace the 2SD439-D with the 2SC1162, 2SC1162-B, 2SC1368, 2SD793, 2SD793-R, 2SD882, 2SD882R, BD185, BD433, BD433G, BD435, BD435G, KSD882, KSD882-R, KSE200, KSH882, KSH882-R, MJE200, MJE200G or MJE520.