There are no Roku models since introduction of the 2nd generation series in 2011 that directly provide component video.
First generation models have not been supported for a long time. The version of the Roku OS those can not be updated and probably can no longer correctly work with the Roku channel store. Also, pre-installed channels such as Netflix probably will no longer work with Netflix servers of today.
Indirectly, there are adapters and audio receivers available to downgrade a digital HDMI signal to an analog component video signal.
The minimum supported resolution of modern Roku OS is 1280x720 so make sure the component video device you plan to use can match or exceed that before investing in any adapter.