The KDS model 1C209830BC0C is a surface mount (SMD) crystal resonator that is RoHS compliant and meets applicable industry standards. It has a symmetric configuration of four pins (SMD-3225_4P) and can be used to generate precise timing signals for a variety of applications. The chip works by resonance, meaning it oscillates at precise frequencies up to a certain level and has a tight tolerance range. It's designed to be used in applications with higher frequencies, such as cell phones, cable modems, and Ethernet systems, with a frequency range of 16MHz to 128MHz. It also features a high insulation resistance with a low dielectric constant. The 1C209830BC0C, when paired with other components, can be used to create a wide variety of products, such as frequency synthesizers, oscillators, radio transceivers, and audio filters.