Статьи

Standards of printed boards: Class 2 vs. Class 3

Where are the major differences in class 2 and class 3 other than in the IPC-A-610 standard? In which
standards is the difference most significant and notable?

ENIG Surface Industry Standards and Common Practices
Per IPC-4552, there should be 2-5 micro-inches of immersion gold applied over 120 to 240
micro-inches of electroless nickel.