MNDO, AM1 and PM3 semiempirical models have been employed to study the bonding and structure of 1-fluorosilatrane using full geometry optimization. Heats of formations were calculated at different Si-N distances between 200 pm and 360 pm. Two minima were found on the energy profile when C3 Symmetry was retained. A third local energy minimum has been found, in a non-symmetrical conformation.