Wireless sensor networks have attracted much research effort in the past five years. With TinyOS, there exists a widely used, microthreaded operating system targeted for single processor sensor nodes. It requires only minimal processing and memory resources. Many research activities in the wireless sensor area focus on the design of efficient protocols in the MAC and network layer. SDL - a high-abstraction level formal description language - has long been used for modeling, simulation, and verification of communication protocols. In this paper, we present a mapping approach and optimizations to derive efficient component-based event-driven TinyOS applications from SDL models. We show, how the basic SDL concepts are reflected in the TinyOS component architecture.