Thanks Allison for explanation. I had heard that small signal characteristics were same, so that explains it.?
Before the internet I recall an engineer asking a colleague for a PNP complement to a particular NPN he wanted to use. I realize hole and electron behavior is different, so I wonder what parameters they were seeking to match?
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in early days there were countless transistor part numbers for small signal types. I wonder if this way due to process variation. Or to mimic the countless tube part numbers. Often most any silicon NPN will work in many circuits.?
Curt
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