2SD1266-O Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 60 V
• Collector-Base Voltage, max: 60 V
• Emitter-Base Voltage, max: 6 V
• Collector Current − Continuous, max: 3 A
• Collector Dissipation: 35 W
• DC Current Gain (h_fe): 160 to 320
• Transition Frequency, min: 30 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 2SD1266-O transistor can have a current gain of 160 to 320. The gain of the 2SD1266 will be in the range from 70 to 320, for the 2SD1266-P it will be in the range from 120 to 250, for the 2SD1266-Q it will be in the range from 70 to 150.Sometimes the "2S" prefix is not marked on the package - the 2SD1266-O might only be marked "D1266-O".The BDP949 (SOT-223) and FZT692B (SOT-223) is the SMD version of the 2SD1266-O transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SD1266-O with the 2SC1826, 2SC1985, 2SC1986, 2SC2075, 2SC3179, 2SC3851, 2SC3851A, 2SC4007, 2SC4007-F, 2SC4008, 2SC4008-F, 2SC4550, 2SC4551, 2SC4552, 2SD1134, 2SD1134-D, 2SD1266A, 2SD1266A-O, 2SD1274, 2SD1274A, 2SD1274B, 2SD1761, 2SD1761-F, 2SD2012, 2SD2061, 2SD2394, 2SD2394-F, 2SD313, 2SD313F, 2SD613, 2SD613-F, 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, BDX77, D44H11, D44H11FP, D44H8, KSD2012, KSD2012-G, MJE15028, MJE15028G, TIP41D or TIP42D.