Tool/software:
I have been advised by TI to post here to get in touch with an application engineer who can help me with my problem.
The issue is that in a circuit that is used to generate a high performance square wave and has been in production for over 20 years, parts that are marked with the "new" markings fail production test. Newer according to the following document:
Application Design Guidelines for LM339, LM393, TL331 Family Comparators Including the New B-versions (Rev. F)
Upon investigation, it has been determined that the noise floor of the square wave is higher on these new parts, and that has been tracked down to increased jitter from the LM393A. An A/B part swap test between old and new marked parts has confirmed that LM393A new parts perform worse than the old parts.
Troubleshooting and experimentation has been performed on the circuit and while some changes have been found to reduce the noise floor of the square wave and improve performance, the new parts cannot be made to match performance of the old part.
Short term, we have been able to acquire a reel of old parts that work however we are concerned if the old parts become unavailable we will be unable to ship product that meets current specification. The two versions of the part are being sold under the same TI PN, however they are not equivalent in this application and that makes ensuring that we use only one version of the part very difficult.
Schematic, lab report, scope screen shots, and information on what has been tried are available but I cannot post further details on a public forum due to IP constraints. Please contact me for further discussions. I could use some help troubleshooting this issue.
