2SD812-P Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 80 V
• Collector-Base Voltage, max: 80 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 5 A
• Collector Dissipation: 40 W
• DC Current Gain (h_fe): 100 to 200
• Transition Frequency, min: 15 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-220

Here is an image showing the pin diagram of this transistor.The 2SD812-P transistor can have a current gain of 100 to 200. The gain of the 2SD812 will be in the range from 40 to 200, for the 2SD812-Q it will be in the range from 60 to 120, for the 2SD812-R it will be in the range from 40 to 80.Sometimes the "2S" prefix is not marked on the package - the 2SD812-P might only be marked "D812-P".The complementary PNP transistor to the 2SD812-P is the 2SB747-P.The BDP951 (SOT-223) is the SMD version of the 2SD812-P transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SD812-P with the 2SC1986, 2SC2334, 2SC2527, 2SC3258, 2SC3308, 2SC3346, 2SC3540, 2SC3710, 2SC3710A, 2SC3834, 2SC4153, 2SD1270, 2SD1271, 2SD1274, 2SD1274A, 2SD1274B, 2SD1355, 2SD1362, 2SD1407, 2SD1407A, 2SD1411, 2SD1411A, 2SD2059, 2SD363, 2SD525, 2SD569, 2SD569-K, 2SD613, 2SD613-E, 2SD772, 2SD792, 2SD823, 2SD866, 2SD866A, BD243B, BD243C, BD537, BD539B, BD539C, BD539D, BD543B, BD543C, BD545B, BD545C, BD799, BD801, BD809, BD951, BD953, BD955, BDT83, BDT83F, BDT85, BDT85F, BDT87, BDT87F, BDT93, BDT93F, BDT95, BDT95F, BDX77, D44H11, D44H11FP, KSC2334, KSD363, KSD569, KSD569-Y, KTC2018, KTC2028, KTD2059, MJE15028, MJE15028G, MJE15030, MJE15030G, MJF15030, MJF15030G, TIP41D, TIP41E, TIP41F, TIP42D, TIP42E or TIP42F.