DFM and Assembly Considerations
, which defines minimum electrical spacing based on voltage and board location (internal vs. external) to prevent arcing and shorts. Thermal Management Ipc-2221 Pcb Design Pdf
Export the clearance tables from the PDF into an Excel matrix. Input your maximum operating voltage (peak) and pollution degree. DFM and Assembly Considerations , which defines minimum
is now often preferred for more accurate, modern current-carrying results. Design for Manufacturability (DFM) Input your maximum operating voltage (peak) and pollution
The document is massive, but most designers focus on specific chapters relevant to their layout tasks.
At 5,000 meters, air is thinner; arc-over happens at 50% of the sea-level voltage. If your product is for a high-altitude city (e.g., Denver or Mexico City), the PDF requires you to multiply internal clearances by 1.5x.
: This is the current revision (released in 2012). It replaced IPC-2221A and IPC-D-275. Accessing the Paper