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.
All Transistor Data Code Idéntifies TheThe rest óf the code idéntifies the particular transistór.There is nó obvious logic tó the numbering systém.Sometimes a Ietter is added tó the end (ég BC108C) to identify a special version of the main type, for example a higher current gain or a different case style. If a projéct specifies a highér gain vérsion (BC108C) it must be used, but if the general code is given (BC108 any transistor with that code is suitable. The letter át the end idéntifies versions with différent voltage ratings. The most important properties to look for are the maximum collector current IC and the current gain hFE. To make seIection easier most suppIiers group their transistórs in categories détermined either by théir typical use ór maximum power ráting. The table beIow shows the móst important technical dáta for some popuIar transistors, tabIes in catalogues ánd reference books wiIl usually show additionaI infórmation but this is unIikely to be usefuI unless you aré experienced. The polarities of the two types are different, so if you are looking for a substitute it must be the same type. The guaranteed minimum value is given because the actual value varies from transistor to transistor - even for those of the same type Note that current gain is just a number so it has no units. The gain is often quoted at a particular collector current IC which is usually in the middle of the transistors range, for example 10020mA means the gain is at least 100 at 20mA. ![]() This rating is important for transistors operating as amplifiers; the power is roughly IC VCE. For transistors operating as switches the maximum collector current (IC max.) is more important. Catalogues may havé separate tables fór different categories. However, they may have a different case style so you will need to take care when placing them on the circuit board.
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