2SD1273AQ Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 80 V
• Collector-Base Voltage, max: 100 V
• Emitter-Base Voltage, max: 6 V
• Collector Current − Continuous, max: 3 A
• Collector Dissipation: 40 W
• DC Current Gain (h_fe): 500 to 1000
• Transition Frequency, min: 50 MHz
• 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 2SD1273AQ transistor can have a current gain of 500 to 1000. The gain of the 2SD1273A will be in the range from 500 to 2500, for the 2SD1273AO it will be in the range from 1200 to 2500, for the 2SD1273AP it will be in the range from 800 to 1500.Sometimes the "2S" prefix is not marked on the package - the 2SD1273AQ might only be marked "D1273AQ".You can replace the 2SD1273AQ with the 2N6531, 2N6533, 2SC1986, 2SC2075, 2SC2316, 2SC3852A, 2SD1274, 2SD1274A, 2SD1274B, 2SD772, 2SD792, 2SD823, BD241B, BD241C, BD243B, BD243C, BD537, BD539B, BD539C, BD539D, BD543B, BD543C, BD545B, BD545C, BD799, BD801, BD809, BD951, BD953, BD955, BDT83, BDT83F, BDT85, BDT85F, BDT87, BDT87F, BDX53D, BDX53E, BDX53F, BDX77, D44H11, D44H11FP, MJE15028, MJE15028G, MJE15030, MJE15030G, MJF15030, MJF15030G, TIP41D, TIP41E, TIP41F, TIP42D, TIP42E or TIP42F.