It allows you to select Vc, Ic, Beta, Ft etc. If you need to care about Ft then chances are that you should be showing us your circuit and telling us what you are ring to do and then asking for advice.Ī good source (one of quite a few) of information on US available transistors can be had from Digikeys online catalog. The next most important parameter is possible "Ft" - the effective maximum operating frequency (although the transistor is of no use at that frequency). I just entered "transistor" (without quotes) in the search box at the top level, then clicked on "Transistors (BJT) - Single (13,797 items)" and it took me to the transistor search page above It's worth noting how the above transistor search was arrived at. You can use the same method for your 2N3634 once you know its parameters. Or you can start at the top and search Digikey's whole websitewith BC107 data sheet here. You can find many of Digikey's transistors here There are special requirements that are affected by a number of other parameters, but in most cases you will not need to worry about them. If you use a part that has at least the same Vc max or higher, at least the same Ic max or higher and an equal or greater typical current gain then the transistor will work acceptably in the majority of circuits. Minimum and typical current gain figures (= "Beta").Maximum allowed collector current (Ic or Ic or.Maximum allowed Collector Voltage ( Vc or Vce or Vceo).The most important parameters of small bipolar transistors (like your two) are Note that a BC106 quite possibly never existed - see "BC106 where are you?" note at end of this answer.
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