![]() A bipolar transistor allows a small current injected at one of its terminals to control a much larger current flowing between two other terminals, making the device capable of amplification or switching.īJTs use two junctions between two semiconductor types, n-type and p-type, regions in a single crystal of material. In contrast, a unipolar transistor, such as a field-effect transistor, uses only one kind of charge carrier. It is a 200 mA, 40 V, 625 mW transistor with a transition frequency of 300 MHz, with a minimal beta, or current gain, of 100 at a collector current of 10 mA.Ī bipolar junction transistor (BJT) is a transistor that uses both electrons and electron holes as charge carriers. Some manufacturers mark “EBC” on the moulded part, but all are required to have those connections for a part which is a “2N3904”. When looking at the flat side with the leads pointed downward, the three wires emerging from the bottom are connected to, from left to right, the emitter, the base and the collector. This transistor is low-cost, widely available and sufficiently robust to be of use by experimenters and electronics hobbyists. ![]() ![]() Motorola Semiconductor registered in the mid-1960s, together with the complementary PNP type 2N3906, and represented a significant performance/cost improvement, with the plastic TO-92 case replacing metal cans. ![]()
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