We’ve had a few questions regarding markings on the ECX-71 Oscillators, regarding part markings that follow a format of “XXxxx” (capital = letters; lower-case = numbers). Generally the fact that these markings don’t appear to follow ECS Inc’s part numbering system causes confusion.
This marking denotes a date/lot code, and does not relate to the part number. If you need to confirm that a given date code matches the one requested in your order, please contact us via email, with an attached photo of the parts showing the marking, and we will confirm the code.
Applicable Part Numbers: