2SD525-O Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 100 V
• Collector-Base Voltage, max: 100 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 5 A
• Collector Dissipation: 40 W
• DC Current Gain (h_fe): 70 to 140
• Transition Frequency, min: 12 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 2SD525-O transistor can have a current gain of 70 to 140. The gain of the 2SD525 will be in the range from 40 to 240, for the 2SD525-R it will be in the range from 40 to 80, for the 2SD525-Y it will be in the range from 120 to 240.Sometimes the "2S" prefix is not marked on the package - the 2SD525-O might only be marked "D525-O".The complementary PNP transistor to the 2SD525-O is the 2SB595-O.The BDP953 (SOT-223) is the SMD version of the 2SD525-O transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SD525-O with the 2SC2334, 2SC2334L, 2SC2527, 2SC3834, 2SC4153, 2SD1355, 2SD1355-O, 2SD1407, 2SD1407-O, 2SD1407A, 2SD1407A-O, 2SD2059, 2SD2059-O, 2SD363, 2SD363-O, 2SD772, 2SD772A, 2SD792, 2SD792A, 2SD866A, BD243C, BD539C, BD539D, BD543C, BD545C, BD711, BD743C, BD801, BD911, BD953, BD955, BDT85, BDT85F, BDT87, BDT87F, BDT95, BDT95F, KSC2334, KSC2334O, KSD363, KSD363-O, KTC2018, KTC2018-O, KTC2028, KTC2028O, KTD2059, KTD2059O, MJE15028, MJE15028G, MJE15030, MJE15030G, MJF15030, MJF15030G, TIP41D, TIP41E, TIP41F, TIP42D, TIP42E or TIP42F.