  In this work we discuss in detail the known solutions of the stationary
Schr\"odinger equation subject to a deformable hyperbolic tangent potential
exactly soluble $ V(x) = \frac {V_0} {2} (1+ \tanh (\delta x)) $. We find the
analytical solutions in terms of Gauss hypergeometric functions for the
scattering states with energy greater than the maximum value of the potential.
We also discussed the case for the energy lower than the maximum and the
similarities and differences with the abrupt step potential in both cases. We
graphically illustrate the relevant physical situations to the problem.
