2SD1273Q Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 60 V
• Collector-Base Voltage, max: 80 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 2SD1273Q transistor can have a current gain of 500 to 1000. The gain of the 2SD1273 will be in the range from 500 to 2500, for the 2SD1273O it will be in the range from 1200 to 2500, for the 2SD1273P it will be in the range from 800 to 1500.Sometimes the "2S" prefix is not marked on the package - the 2SD1273Q might only be marked "D1273Q".The complementary PNP transistor to the 2SD1273Q is the 2SB1299Q.You can replace the 2SD1273Q with the 2N6531, 2N6533, 2SC1985, 2SC1986, 2SC2075, 2SC2315, 2SC2316, 2SC3179, 2SC3852, 2SC3852A, 2SD1273A, 2SD1273AQ, 2SD1274, 2SD1274A, 2SD1274B, 2SD2375, 2SD2375-Q, 2SD2396, 2SD823, BD203, BD241A, BD241B, BD241C, BD243A, BD243B, BD243C, BD303, BD535, BD537, BD539A, BD539B, BD539C, BD539D, BD543A, BD543B, BD543C, BD545A, BD545B, BD545C, BD797, BD799, BD801, BD807, BD809, BD949, BD951, BD953, BD955, BDT81, BDT81F, BDT83, BDT83F, BDT85, BDT85F, BDT87, BDT87F, BDX53D, BDX77, D44H11, D44H11FP, D44H8, KSD1273, KSD1273Q, MJE15028, MJE15028G, TIP41D or TIP42D.