Dielectric properties of an organic material, which shows conductance switching with associated memory phenomenon, have been studied. The devices have been modeled as a parallel combination of a resistor and a capacitor. During conductance switching, devices' resistive and capacitive properties have been found to change. Multilevel conductivity, which is due to different density of high-conducting reduced molecules in the devices, has also been manifested in dielectric measurements. We could induce ('write') a low-conducting state and three high-conducting states and probe ('read') them by measuring frequency dependence impedance characteristics without any dc bias for multilevel read-only and random access memory applications. (C) 2004 Elsevier B.V. All rights reserved.