I need to isolate several digital signals up to 4kV.
I think that ADuM240x and ADuM440x (5kV RMS Quad-Channel Digital Isolators) can do it properly, but I don't understand how to respect spacing:
There is 7.5mm between each 5kV isolated side of the components, but IPC-2221 norm indicate that for an external component with uncoated lead or termination, spacing of 12mm is requiered for 4kV.
How ADuM components can be compliant with IPC rules?
Thank you for your help,