Google the manufacturer and go directly to their website. Most manufacturers provide data and they don't charge or make you jump through any hoops to get it.
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The hardest thing to overcome, is not knowing that you don't know.
DSP Innovations has recently launched a FREE data sheet
search site. The site, www.datasheetpro.com , enables component and design
engineers to easily find electronic and semiconductor datasheets necessary for
their projects. Please try
out the service and provide your feedback to support -at-
datasheetpro [dot] com.
Additionally, the site will allow manufacturers to upload
their newest datasheets
and cross references for search. Please see
www.datasheetpro.com/services.php for
details.