  The energy eigenvalues of a Dirac particle for the hyperbolic-type potential
field have been computed approximately. It is obtained a transcendental
function of energy, $\mathcal{F}(E)$, by writing in terms of confluent Heun
functions. The numerical values of energy are then obtained by fixing the zeros
on "$E$-axis" for both complex functions $Re[\mathcal{F}(E)]$ and
$Im[\mathcal{F}(E)]$.
