Consider joining IIIT Ranchi, only if your JEE mains ranking is around 30-50K and you are not left with any other better options. It's a fairly new college and only had one placement session. 

As of now they do not have a permanent campus and are operating from their interim campus located in Ranchi. Construction of a permanent campus is going on and it will take a few more years to be under active enforcement. Till then you will stay and study in the NIT Jamshedpur campus and will be provided all their facilities. 

Quick stats 2021:

Now, whether or not IIIT Ranchi will be a good option for you, that depends on your expectation from the degree.

• Clearly, if your rank lies in that range, you can opt for IIIT Ranchi rather than some lesser-known private institutes. But you need to work hard and do well during the placement drive. 
• However, you will not get a higher package than NIT Jamshedpur students, since placements are handled by NIT Jamshedpur. 

Companies will certainly look for the best in the lot. So if you are really passionate about ECE and know what you are doing then you can certainly go for IIIT Ranchi.