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Go to National Semiconductors http://www.national.com, search for the part you're looking for and then a page will appear with the description of the part/parts and with info about whether free sample is available or not. Before asking for the sample you have to register yourself which is free. You can ask for a maximum of 5 types of samples/week. They send one for each type every week.
thank two friends,but I had knew Ns and TI two web offer free sample,but also I know http://www.maxim-ic.com can offer free sample too.if can tell me the other web. NS and MAXIM is very easy for request sample,TI is difficult.