  We have studied the temperature dependence of the integer quantum Hall
transitions in the molecular crystal (TMTSF)$_2$PF$_6$. We find that the
transition width between the quantum Hall plateaus does not exhibit the
universal power-law scaling behavior of the integer quantum Hall effect
observed in semiconducting devices. Instead, the slope of the $\rho_{xy}$
risers, $d\rho_{xy}/dB$, and the (inverse) width of the $\rho_{xx}$ peaks,
$(\Delta B)^{-1}$, show a BCS-like energy gap temperature dependence. We
discuss these results in terms of the field-induced spin-density wave gap and
order parameter of the system.
