2SD1265A-O Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 80 V
• Collector-Base Voltage, max: 80 V
• Emitter-Base Voltage, max: 8 V
• Collector Current − Continuous, max: 4 A
• Collector Dissipation: 30 W
• DC Current Gain (h_fe): 80 to 160
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-220F

Here is an image showing the pin diagram of this transistor.The 2SD1265A-O transistor can have a current gain of 80 to 160. The gain of the 2SD1265A will be in the range from 30 to 160, for the 2SD1265A-P it will be in the range from 50 to 100, for the 2SD1265A-Q it will be in the range from 30 to 60.Sometimes the "2S" prefix is not marked on the package - the 2SD1265A-O might only be marked "D1265A-O".The BDP951 (SOT-223) is the SMD version of the 2SD1265A-O transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SD1265A-O with the 2SC1827, 2SC1986, 2SC2075, 2SC2334, 2SC2527, 2SC3258, 2SC3308, 2SC3346, 2SC3540, 2SC3710, 2SC3710A, 2SC3834, 2SC3851A, 2SC4153, 2SC4511, 2SC4512, 2SD1267A, 2SD1269, 2SD1270, 2SD1271, 2SD1274, 2SD1274A, 2SD1274B, 2SD1355, 2SD1356, 2SD1362, 2SD1407, 2SD1407A, 2SD1408, 2SD1411, 2SD1411A, 2SD2059, 2SD2060, 2SD363, 2SD389A, 2SD389A-O, 2SD525, 2SD526, 2SD569, 2SD613, 2SD743, 2SD743A, 2SD772, 2SD792, 2SD812, 2SD823, 2SD857A, 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, KSD1408, KSD363, KSD526, KSD569, KTC2018, KTC2027, KTC2028, KTD2059, KTD2060, MJE15028, MJE15028G, MJE15030, MJE15030G, MJF15030, MJF15030G, NTE152, TIP41D, TIP41E, TIP41F, TIP42D, TIP42E or TIP42F.