This document provides a reverse costing analysis of the SI504 MEMS oscillator by Silicon Labs, detailing manufacturing costs, technology data, and selling price estimations. The SI504, the first silicon oscillator from Silicon Labs, utilizes a CMOS+MEMS process for integration, designed for high-volume consumer electronics applications. The study includes an overview of packaging, physical analysis, cost analysis, and supply chain insights, emphasizing economic analysis and the methodology employed.