This is the typical value of the specification a part; the actual distribution of a population of parts will vary, but the typical value should be representative of the distribution of a large population of parts.
Sometimes a parameter will have a typical value and no minimum and/or maximum values in a data sheet. In this case, the value of this parameter is not gauranteed by the manufacturer. If a specification has a minimum or maximum value, it is usually gauranteed by production test or gauranteed by design.
That's the new politically correct way of writing numbers that would normally have decimal points. Some parts of the world (Germany for example) use a comma to separate the integer and fraction digits. To avoid ambiguity in international situations, some people now put the letter for the units where the decimal point should be. So "3V3" really means 3.3 Volts and "1V8" means 1.8 Volts.
If your audience is English speaking or it is obvious the document or the context is in English, then you are fine using a decimal point normally. After all, using a decimal point is part of the language no less than the words used to describe other things, so this is not ambiguous. In rare cases when numbers are by themselves without a language context, then it's probably best to use the "3V3" type notation. Otherwise, I personally find this notation rather annoying since I have to look at it and think about it rather than the brain parsing it without much conscious thought.
As with most things PC, it's about choosing which group of people to piss off.
Best Answer
typ stands for typical.
This is the typical value of the specification a part; the actual distribution of a population of parts will vary, but the typical value should be representative of the distribution of a large population of parts.
Sometimes a parameter will have a typical value and no minimum and/or maximum values in a data sheet. In this case, the value of this parameter is not gauranteed by the manufacturer. If a specification has a minimum or maximum value, it is usually gauranteed by production test or gauranteed by design.