  It is shown that in case of central potentials, both the fourth component of
Lorentz vector as well as Lorentz scalar in the Dirac Hamiltonian, owing to the
conserved Dirac spin-orbital matrix, there arises Wittens N=2 superalgebra. The
generators of this algebra are constructed and their commutativity with Dirac
Hamiltonian is studied. Under the requirement of in-variance relative to this
super algebra it follows that only Coulomb like potential obeys the
corresponding constraints. This fact allows us to suppose the Wittens
superalgebra as an alternative source for emerging of the Coulomb potential. As
a byproduct, we obtain energy spectrum without solving the Dirac equation, i.e.
by pure algebraically.
