2SD843-O Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 80 V
• Collector-Base Voltage, max: 100 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 7 A
• Collector Dissipation: 40 W
• DC Current Gain (h_fe): 70 to 140
• Transition Frequency, min: 10 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 2SD843-O transistor can have a current gain of 70 to 140. The gain of the 2SD843 will be in the range from 70 to 240, for the 2SD843-Y it will be in the range from 120 to 240.Sometimes the "2S" prefix is not marked on the package - the 2SD843-O might only be marked "D843-O".The complementary PNP transistor to the 2SD843-O is the 2SB753-O.You can replace the 2SD843-O with the 2SC2563, 2SC2578, 2SC2579, 2SC2580, 2SC2581, 2SC2706, 2SC2837, 2SC2837-P, 2SC3181, 2SC3181-O, 2SC3181N, 2SC3181N-O, 2SC3182, 2SC3182-O, 2SC3280, 2SC3284, 2SC3284-P, 2SC3519, 2SC3519-P, 2SC3835, 2SC3854, 2SC3854-P, 2SC3855, 2SC3855-P, 2SC4278, 2SC4467, 2SC4467-P, 2SC4468, 2SC4468-P, 2SC4652, 2SC4689, 2SC4690, 2SC5197, 2SC5198, 2SC5199, 2SC5774, 2SC5775, 2SD1046, 2SD1047, 2SD1148, 2SD1288, 2SD1289, 2SD1717, 2SD1840, 2SD1840-Q, 2SD1841, 2SD1841-Q, 2SD1842, 2SD1842-Q, 2SD2052, 2SD2053, 2SD712, 2SD731, 2SD998, BD245B, BD245C, BD249B, BD249C, BD745B, BD745C, BDV93, BDV95, FJA4310, FJA4310O, KTD1047, KTD1047B, KTD718, KTD718B, KTD998 or TIP35CA.