2SD1840-Q Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 100 V
• Collector-Base Voltage, max: 110 V
• Emitter-Base Voltage, max: 6 V
• Collector Current − Continuous, max: 15 A
• Collector Dissipation: 100 W
• DC Current Gain (h_fe): 70 to 140
• 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 2SD1840-Q transistor can have a current gain of 70 to 140. The gain of the 2SD1840 will be in the range from 50 to 140, for the 2SD1840-P it will be in the range from 50 to 100.Sometimes the "2S" prefix is not marked on the package - the 2SD1840-Q might only be marked "D1840-Q".The complementary PNP transistor to the 2SD1840-Q is the 2SB1230-Q.You can replace the 2SD1840-Q with the 2SC3281, 2SC3519, 2SC3519-P, 2SC3519A, 2SC3519A-O, 2SC3519A-P, 2SC3519A-Y, 2SC3856-P, 2SC5949, 2SC6011, 2SC6011-P, 2SD1718, 2SD1841, 2SD1841-Q, 2SD1842, 2SD1842-Q, 2SD2155, BD245C, BD249C, BD745C, NTE2328 or TIP35CA.