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Transistors<^< Diodes etc | Course Index | Integrated Circuits >^> ![]() Small-signal Transistors - TO92 These two small-signal transistors provide common-emitter current gains of between 150 and 200 and they are supplied in a plastic TO92 package. Transistors of this type are ideal for use as general purpose amplifiers and as low-current switches. ![]() Small-signal Transistors - TO18 These small-signal transistors are supplied in TO18 packages and they exhibit common-emitter current gains of between 175 and 250. Transistors of this type are used in audio amplifiers and for general purpose applications. ![]() Medium Power Transistor - TO5 Medium-power transistors are often supplied in TO5 packages. These particular devices offer a maximum collector power dissipation of 1W with current gain in the range from 50 to 125. Transistors of this type are often used as driver stages in power amplifiers. ![]() Power Transistors - TO220 This TO220 packaged power transistor is rated at a maximum collector power dissipation of 15W and it is able to withstand collector-emitter voltage of up to 65V. The device is ideal for use in the output stage of a power amplifier (in which case it is normally used in conjunction with another complementary transistor). ![]() Power Transistors - TO3 In very high power applications (e.g. at power levels of 50W, or more) it is necessary to provide a transistor with very effective means of conducting the heat away from the semiconductor junction. This metal-cased TO3 packaged transistor can be used very effectively with a metal finned heatsink to ensure that the junction remains cool. This particular transistor is rated at a maximum collector power dissipation of 115W. <^< Diodes etc | Course index | Integrated Circuits >^> |