I am trying to design a 2 stage BJT amplifier and I am having trouble choosing a spec sheet for the 2N2222A transistor which I am using. Normally, when i buy my parts, the spec sheet is not usually provided. So i decided to look for one on the internet using datasheetpro.com, the search engine. Unfortunately I discovered that different manufacturers may have slightyly different values of hfe. One is from 100 to 300, another is 75 to 300. Which value should I use?or is there any way I can match my transistor to a specific datasheet?
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