To fully understand an , you must understand its revision history. The standard has evolved significantly.
If your legacy design still calls out "IPC-SM-840-C Class H," what should you do? ipc-sm-840 pdf
This earlier revision introduced the concept of (Telecommunications) and Class H (High Reliability). It focused heavily on surface insulation resistance (SIR) and electromigration resistance. To fully understand an , you must understand