The data in this table was compiled from several sources which are not entirely consistent! Most of the discrepancies are minor, but please consult information from your supplier if you require precise data. The quantities shown in the table are explained below. The table below shows the most important technical data for some popular transistors, tables in catalogues and reference books will usually show additional information but this is unlikely to be useful unless you are experienced. They contain a great deal of useful information but they can be difficult to understand if you are not familiar with the abbreviations used. To make a final choice you will need to consult the tables of technical data which are normally provided in catalogues. To make selection easier most suppliers group their transistors in categories determined either by their typical use or maximum power rating. The most important properties to look for are the maximum collector current IC and the current gain hFE. Most projects will specify a particular transistor, but if necessary you can usually substitute an equivalent transistor from the wide range available. There is no obvious logic to the numbering system. The initial '2N' identifies the part as a transistor and the rest of the code identifies the particular transistor. Codes beginning with 2N, for example 2N3053.The letter at the end identifies versions with different voltage ratings. TIP refers to the manufacturer: Texas Instruments Power transistor. Codes beginning with TIP, for example TIP31A.If a project specifies a higher gain version (BC108C) it must be used, but if the general code is given (BC108 any transistor with that code is suitable. Sometimes a letter is added to the end (eg BC108C) to identify a special version of the main type, for example a higher current gain or a different case style. The rest of the code identifies the particular transistor.There is no obvious logic to the numbering system. The second letter indicates the type for example C means low power audio frequency D means high power audio frequency F means low power high frequency. The first letter B is for silicon, A is for germanium (rarely used now). Codes beginning with B (or A), for example BC108, BC478.There are three main series of transistor codes used in the UK:
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