  We present a new supersymmetric version of the SU(3) otimes U(1) gauge model
using a more economic content of particles. The model has a smaller set of free
parameters than other possibilities considered before. The MSSM can be seen as
an effective theory of this larger symmetry. We find that the upper bound of
the ligthest CP-even Higgs boson can be moved up to 140 GeV.
