Post #3990384
2026-07-21 16:32 UTC
Has anyone had issues with putting a 10/100 Ethernet PHY too close to the magnetics? I have a super compact rigid flex design (27.75 mm diameter), and I'm cramming in the stuff pretty close.
I'm maintaining a keep out directly under the magnetics, but the PHY IC body is 5mm away. An app note I read said keep it 25mm away.
Replies (1)
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@0h00000000@ioc.exchange 2026-07-21 19:11
This is what I'm thinking. Dividing up assembly into 3 circular rigid flex regions (magnetics/POE power/phy; processing; and image sensor). These would fold up together, and this would be the outside one with all the tall components on the backside. The PHY and the 60v to 3.3v SMPS module would be noisy in proximity to the Ethernet magnetics. The SMPS does have spread spectrum. Cat5 would solder directly to the board. The rectangle represents the transition to flex and it's bend radius.