The guaranteed minimum value is given because the actual value varies from transistor to transistor - even for those of the same type! H FE - the current gain (strictly the DC current gain). maximum voltage across the collector-emitter junction, ignore this for low voltage circuits. Structure - type of transistor, NPN or PNP, a substitute must be the same type. ![]() These are some of the terms you are likely to see: They contain a great deal of useful information but can be difficult to understand if you are not familiar with the To make a final choice you may need to consult tables of technical data provided in catalogues, books and on-line. To make selection easier most suppliers group their transistors in categoriesĭetermined either by their typical use or maximum power rating. ![]() The most important properties to look for are the maximum collector current I CĪnd the current gain h FE. Most projects will specify a particular transistor but you can usually substitute an equivalent transistorįrom the wide range available.
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