2SD553 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 50 V
• Collector-Base Voltage, max: 70 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 7 A
• Collector Dissipation: 40 W
• DC Current Gain (h_fe): 70 to 240
• Transition Frequency, min: 10 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 2SD553 transistor can have a current gain of 70 to 240. The gain of the 2SD553-O will be in the range from 70 to 140, for the 2SD553-Y it will be in the range from 120 to 240.Sometimes the "2S" prefix is not marked on the package - the 2SD553 might only be marked "D553".The complementary PNP transistor to the 2SD553 is the 2SB553.You can replace the 2SD553 with the 2SC2334, 2SC3254, 2SC3255, 2SC3345, 2SC3346, 2SC3709, 2SC3709A, 2SC3710, 2SC3710A, 2SC3747, 2SC3748, 2SD1061, 2SD1062, 2SD1271, 2SD1362, 2SD1363, 2SD1411, 2SD1411A, 2SD1412, 2SD1668, 2SD1669, 2SD866, 2SD866A, BD203, BD303, BD535, BD537, BD543A, BD543B, BD543C, BD545A, BD545B, BD545C, BD797, BD799, BD801, BD807, BD809, BDT81, BDT81F, BDT83, BDT83F, BDT85, BDT85F, BDX77, D44H11, D44H11FP, D44H8 or KSC2334.