  We show that the type-I seesaw, responsible for generating the light neutrino
mass, itself is capable of accommodating one of the three right handed
neutrinos as a freeze-in type of dark matter (DM) where the required smallness
of the associated coupling is connected to the lightness of the (smallest)
active neutrino mass. It turns out that (a) the non-thermal production of DM
having mass $\lesssim \mathcal{O}(1)$ MeV (via decays of $W, Z$ bosons and SM
Higgs) consistent with relic density as well as (b) its stability determine
this smallest active neutrino mass $\sim {\mathcal{O}}(10^{-12})$ eV. On the
other hand, study of flavor leptogenesis in this scenario (taking into account
the latest neutrino data and Higgs vacuum stability issue) fixes the scale of
two other right handed neutrinos.
