>> It doesn't look like it's likely to be in the "part number" (as >> someone else suggested.) It's probably there, but encoded into some >> proprietary single-letter code... >> >> BillW These codes (X7R, Y5V, etc.) describe the ceramic dielectric. In the "no free lunch" standard, you can get a high dielectric constant, low temperature coefficient, tight tolerance, low voltage coefficient, etc., but not all in the same dielectric. Harold --=20 FCC Rules Updated Daily at http://www.hallikainen.com - Advertising opportunities available! --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .