u/Adoremachina

Sorry if this isn’t the correct group, but does anyone know if there is a standard gold thickness for components that have NiPdAu finishes? I am having a debate with a coworker on when gold embrittlement is a concern with gold thickness, and when gold washing is required for SMT parts per industry standards for aerospace product. I found a TI forum that suggested anything over .70 micro inches of gold should have tinning required but my coworker disagrees and said it has to do with the gold to palladium ratio. Note, I only barely understand the basics of this application as I’m about 2 months into the job, but I can find very little online about this