![]() The goal here is to provide the same cross-sectional areabetween the original pad/trace and the wire, so a rule of thumb ofapproximately 2X to 3x the wire diameter is probably going to work. ![]() Inyour case I believe you need to determine the optimum pad size for a given wirespecification such as the connector lead, for this you can use the table in IPC7711/7721 in reverse. To determine the correct WIRE size for a modification or repair(such as a jumper), IPC 7711/7721 Repair Method #4.2.5 provides a table (Table1) to determine appropriate jumper wire size to use based on the existingtrace or pad, in order to (again) provide ample current-carrying capacity. This is determined by thedesign engineer if the pads and wires are going to be designed-in, and thesecurrent-carrying capacities are spelled out in IPC 2152 of the designstandards. The pad, trace, and the wire size are determined by thecurrent-carrying capacity required of the circuit. Is there a rule of thumb for pad size such as 2x the bare wire diameter? Is there an applicableIPC guide or specification? ![]() I am looking for therecommended pad size for any given wire diameter. We are lap soldering connector wiresfrom a multipin connector to the surface of a board. ![]()
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