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7
my shunt resistor footprint measures 7.2mm by 3.3mm. Does this sound right for a...
M

markwuflux

@copilot my shunt resistor footprint measures 7.2mm by 3.3mm. Does this sound right for a 2512 (metric) resistor?
2y

copilot

Yes, it does. A 2512 (metric) resistor is approximately 6.35mm by 3.2mm. When considering additional space for easy soldering and to account for tolerances, footprint dimensions of 7.2mm by 3.3mm seem reasonable.
However, I would recommend checking the specific datasheet for your resistor to verify these measurements as part dimensions can vary slightly by manufacturer. Always ensure measurements align with the manufacturer's recommended footprint before moving on with your PCB layout process.
2y
M

markwuflux

lol I just realized I said metric when I meant imperial. Good job noticing!
2y

copilot

Ah, understood. When talking in terms of imperial units, a 2512 package would indeed have footprint measurements close to what you mentioned. In imperial measurements, 2512 refers to 0.25 inches by 0.12 inches, which equals roughly 6.35mm by 3.05mm. Your footprint measures 7.2mm by 3.3mm, which gives a lee-way for soldering and tolerances.
However, these measurements are typical, and might vary depending on the manufacturer. Always double-check specific dimensions from the datasheet of your component.
2y
6
This trace segment is half an inch long https://storage.googleapis.com/flux-com...
M

markwuflux

If we wanted to go further, we could even remove the soldermask of the traces and tin them to get maximum conductivity.
2y
M

markwuflux

Combined with the traces on the bottom layer, we can get the resistance of these trace segments down to 0.75mOhms

commentFileId-2f2512f9eb7bd6cc97f73607f69f5f4d83daec2743f1cc92a95a15bef6d1e4f4.png

https://storage.googleapis.com/flux-comment-files/files/commentFileId-2f2512f9eb7bd6cc97f73607f69f5f4d83daec2743f1cc92a95a15bef6d1e4f4.png?GoogleAccessId=graviton-mvp%40appspot.gserviceaccount.com&Expires=4860415137&Signature=A%2BjqJnZAEpGypwx%2B%2Bs5J0QpDuhz1dwWJYGpAyJHmhZ6iH8ytUxgMMPk6MYZI4R3gfH8Lb9O7HGNtGbSdHrYtxALjqK08fz8ZIRt4rw9n4M3ezbmKHM4pDdNnE9oQeiAKmRKKKSxFQFmT1xb05Q0OZ%2F%2FCnuoswhw9WSwkgiWu1qOWfSUBcbxOScf1%2F7%2F9jBksLIE695CZRfdBJyr3gQVDDH3k6ay1ZrvRpZzXk2aSp6mR5ksIbNnF0I%2FDbxNkzQ6Vs%2BmM3yupC8g8RWOeg7JoUjXekaFXt%2B%2Bz5YT64tocIlRLC%2ByRo9WOZhCeoXDSOOGTYM%2F7d3M5%2FpkYjYcTO8RxfA%3D%3D
2y
M

markwuflux

*1.5mOhms
2y
M

markwuflux

This trace segment is half an inch long

commentFileId-dc696b18fad3d1d64b431def268fdc535d598316e44a54d72dfe74c34d41b13f.png

https://storage.googleapis.com/flux-comment-files/files/commentFileId-dc696b18fad3d1d64b431def268fdc535d598316e44a54d72dfe74c34d41b13f.png?GoogleAccessId=graviton-mvp%40appspot.gserviceaccount.com&Expires=4860414134&Signature=Wijl4TtH7PTgWseNtam6LvcZWAZPxIorX5WMjYSMViS9j40iHCzD7h6j7cQ6jRif8wm7IMiDySddzcoi7dFoPDX4WnYKvrdVF46l3pz9xv9BvkYFvQ78Y82yoygUJE1eQOqqeAELaevWhW0%2FlyMKhEMDaLaa8f3hy1De%2BXzv7crrgvnIKzWrsLedJAfV42fLdhBvxjE3N9V1GhaNDMAdp7pht3RfFBrU11Q7qRrcwW9mF41C5fPzTDCOi%2BuEyyURSWU%2B6O9x%2Fiuk149%2BteTiK%2BbmhQFJ%2FOoPsVt6T%2BYf6PzrnCxfil%2BfOLGu5%2Bn8jlZDhhGuZjJo%2BHuf7yv97Tzklw%3D%3D
This equates to a resistance of 1mOhm at 180mils

commentFileId-4c8e7aca7ffd3cf4f908964a3868587edf51325fc8d0d0193ccef8123745cde6.png

https://storage.googleapis.com/flux-comment-files/files/commentFileId-4c8e7aca7ffd3cf4f908964a3868587edf51325fc8d0d0193ccef8123745cde6.png?GoogleAccessId=graviton-mvp%40appspot.gserviceaccount.com&Expires=4860414142&Signature=B0jSJzK29gXkcabuoHSySDve2NWKGTFlaYW1r4xs3bDpU1b5gxF1WeU9fzRlPhhmbv%2BuPgJjGA%2BBFm8iiVbR7Mec4XyZwOvEDJNVd6HgdwRvDAze5pUHB8KICpg3UsPaq9zbLoRgxUOJqiCLtH399d3XkYNf1tCvbc89woToDKbJE8CJYY9%2FiOh7cEkBXp70A%2FIGiFbulMRi78LUfbcdx%2BFiR4re1gVaOZePejMd5G1vlWrfL%2FRvDu4f8UExxjSb3BXpBWZsIFzYqCAHphRqn4vFkI1Ad0l%2BlEvb3bQ4humTekrYfks4hVAlrwjLo90DJ25e2Gg0Hx8pxC%2BWez%2Funw%3D%3D
2y
5
A 1 inch length of 120mil trace on 1oz copper has a resistance of 4mOhms. https:...
M

markwuflux

180mils gets you down to 3mOhms

commentFileId-83eccb7581def4b57e630d90485a5ea434d1fef25dfb9ae6863184f3b023e3a9.png

https://storage.googleapis.com/flux-comment-files/files/commentFileId-83eccb7581def4b57e630d90485a5ea434d1fef25dfb9ae6863184f3b023e3a9.png?GoogleAccessId=graviton-mvp%40appspot.gserviceaccount.com&Expires=4860414047&Signature=fz1mTTOJ9lj4byCa8R%2BARrdgOcgrZzmmTOe%2BHqkmXErmoN3Abqfb122UyWqw7CZ9VYdbaw6KlunXEpSQIysNbz3g7O1tykrnTwiyb4I%2Fzx98IlS%2FEFhJbUqfyU8lI5UlyZSDY71C88%2B214NdUlwIqEhXxcgLmUHSXdNaf9KtC0Zjk1ZZIzmbTNzVe4zNL5FgmR6lrZtFrPvq9vKsZtx29XJUpHO4ZoMV03wwQB2eI3JO9H2nUSmUW%2BENzlBlf03vVWP4vvpIYRsEPpmik7gCAqTCFMwW4wQ9Cs7vGDvBV2jC6BoSnBKddeibjrO516QFk3PnSfb07XsaqlBn487aNQ%3D%3D
2y
M

markwuflux

A 1 inch length of 120mil trace on 1oz copper has a resistance of 4mOhms.

commentFileId-c6c27d2230409907e3f7e69289be2eefe538a31a20c1495f3fbe0d5744e321db.png

https://storage.googleapis.com/flux-comment-files/files/commentFileId-c6c27d2230409907e3f7e69289be2eefe538a31a20c1495f3fbe0d5744e321db.png?GoogleAccessId=graviton-mvp%40appspot.gserviceaccount.com&Expires=4860413904&Signature=Sx%2FxjHbGYwDk6VaVPKQ9fNKCog1T%2Bo0lT2FnXOAf3uotWI%2BEunk48f%2FtNe8qEBkuOOQykiQr2DGRUVbQ6vrS3SejXan8eEK6eIsBkEvGK48n3%2Fvi%2BdmviNU%2FH4IkmJ9DVbDIVWZtb%2BPxiUc5tGXXrKRnVEWMl3j%2FWruW9DPDImC4wlgqOTcbuGI2fQVPhCTIIo4rKScALl4p%2BppBBaaZm%2Ffmk0GncSYQE8QfQYOtYRr5QdqSC3fDZxIdgbciac1L5GlpmS3JOc%2Bfb0B9sMFpN%2Bp1NysTTEFlyy%2BRkIcQM87aMNZ%2BGgZ%2Ba6XbkyOL7IBViKfOs4F8WrhJkC3jL8L8UA%3D%3D
2y

FET Explosion Board