This paper presents a new modeling methodology accounting for generation and propagation of minority carriers that can be used directly in circuit-level simulators in order to estimate coupled parasitic currents. The model is based on a new compact model of basic components (PN junction and resistance) and takes into account minority carriers at the boundary. An equivalent circuit schematic of the substrate is built by identifying these basic elements in the substrate and interconnecting them. Parasitic effects such as bipolar or latch-up result from the continuity of minority carriers guaranteed by the components' model. A structure similar to a half-bridge perturbing sensitive N-well has been simulated. It is composed by four PN junctions connected together by their common P-doped sides. The results are in good agreement with those obtained from physical device simulations. © 2009 IEEE.