On Thu, 7 May 2009 10:34:08 -0700, "William Sommerwerck"
wrote:

Panasonic and Nichicon make about 20 different grades and "types" of
electrolytics. Does one just look for high operating temp and low ESR, or
are there other factors (or combinations thereof) to consider?

Dimensions (which affects life reduction due to self heating as well
as simply fitting the available space), lifetime (at temperature),
cost, availability, low operating temperature, maximum ripple current,
leakage current, tolerance, working voltage, surge voltage, etc.