-hm and All,
http://www.componentsengineering.com/wp-content/uploads/pdfs/Sample-Request-Form-1.pdf
This is one of two forms I use to save myself a lot of work in selecting or qualifying new or alternate source parts. It takes into consideration the advice of -hm and then some more key items. I give the factory or distributor rep this URL and ask them to complete the form and submit it with the sample parts they are offering. Together with the "Component Information Request" form, I am asking the person selling me the parts to do all the research before I can accept their samples. Questions like, " How long have the parts been in production?" and "What are the reliability numbers?" etc., help me qualify both the part and supplier quickly. More importantly, it helps me disqualify the part and not have to spend unnecessary time in house with qualification procedures. The Reps fill out the forms and often discover the parts are not good alternates as Operating Characteristics may be different or unacceptable. Just give your supplier the URL every time they want to introduce a part and you will have a much easier time with sample part management and allowing or disallowing a supplier as well.
It is also important to read about parts information other then electrical and mechanical characteristics. RoHS compliance, country of origin (free from political troubles), long term stability of vendor and their financial health is also quite relevant in selecting vendor and parts.
It is nice to work with parts from reputed semiconductor vendors. However, when one is to employ specialized semiconductor parts from small manufacturer, data is very limited. It is very difficult to enhance the circuit function in different topology. Designer task becomes very daunting.
So I zoomed in on your symbol and it looks like epsilon (small) or Sigma (large). I think the omicron is just the degree symbol common accross all usage. I suspect that the symbol was either a typo, or represented a quantity from an earlier calculation on the datasheet carried forward. It could be that it represents a summation of vectors or a non-conventional use for phase angle. I would really like to see that datasheet.
It looks like Greek to me. Epsilon and omicron or omega. I have never seen this meaning 45 degrees. Can you scan the datasheet and send it to my email at douglas@componentsengineering.com? Anyone else ever see this? Epsilon usually means "Sum" in formulas. Maybe it is borrowed from another discipline like the building or construction business.
There are some great datasheet archive websites that store every revision of a datasheet and most application notes that refers to the part. It's useful to an engineer to have the complete data set to pick from.
Every datasheet store in the world has huge gaps in their data. Especially PDF datasheets pre 2000. In the 90s datasheets and application notes would disappear from manufacturer websites and be gone forever.
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Join EBN contributor Jennifer Baljko on Thursday August 23, 2012, at 11:00 a.m. EST for a live chat on how electronic manufacturers in Thailand have shored up their supply chain to reduce the impact of future natural disasters.
Peter Drucker famously said "Trying to predict the future is like trying to drive down a country road at night with no lights while looking out the back window." Yet in the razor's-edge world of electronics—with a lean supply chain and just-in-time demands—the need to know the future is vital.
You've heard the saying "the No. 1 supply chain risk is your people." That hasn't always been the case. But today's complex global supply chain requires a new type of multitalented employee. It's one who understands, finance, marketing, economics, is savvy with technology, graceful with relationships and can think analytically.
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