BUL44 series datasheets. Manufacturer: ON Semiconductor.

BUL44 SWITCHMODE NPN Bipolar Power Transistor For Switching Power Supply Applications in 3-pin TO-220 package. Datasheet*) BUL44D2 High Speed, High Gain Bipolar NPN Power Transistor with Integrated Collector-Emitter Diode and Built-in Efficient Antisaturation Network in 3-pin TO-220 package. Datasheet*) BUL44F POWER TRANSISTOR 2.0 AMPERES 700 VOLTS 40 and 100 WATTS Datasheet*) BUL44G Bipolar Power T0220 NPN 2A 400V Datasheet*) There are other manufacturers for this components. For more information please check BUL44 (Motorola)

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