2SD1399 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 800 V
• Collector-Base Voltage, max: 1500 V
• Emitter-Base Voltage, max: 7 V
• Collector Current − Continuous, max: 6 A
• Collector Dissipation: 50 W
• DC Current Gain (h_fe): 8
• Transition Frequency, min: 3 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.Sometimes the "2S" prefix is not marked on the package - the 2SD1399 might only be marked "D1399".You can replace the 2SD1399 with the 2SC3153, 2SC3153-K, 2SC3153-L, 2SC3153-M, 2SC3460, 2SC3460-L, 2SC3460-M, 2SC3460-N, 2SC3461, 2SC3461-L, 2SC3461-M, 2SC3461-N, 2SC3552, 2SC3552-K, 2SC3552-L, 2SC3552-M, 2SC3992, 2SC3992-K, 2SC3992-L, 2SC3992-M, 2SC3993, 2SC3993-K, 2SC3993-L, 2SC3993-M, 2SC3994, 2SC3994-K, 2SC3994-L, 2SC3994-M, 2SC3995, 2SC3996, 2SC3997, 2SC3998, 2SD1403, KSC3552, KSC3552-N, KSC3552-O, KSC3552-R, KSC5030, KSC5030-N, KSC5030-O or KSC5030-R.