The **CSTCC2M40G56-R0** is a specific model of a **Ceramic Resonator** manufactured by Murata Electronics. It belongs to the CERALOCK® family and is primarily used for frequency control and timing in embedded systems. --- ## 1. Technical Specifications The following table outlines the key technical parameters for this component: | Parameter | Specification | | :--- | :--- | | **Nominal Frequency** | 2.40 MHz | | **Frequency Tolerance** | ±0.5% | | **Built-in Load Capacitance** | 47 pF (Typical) | | **Operating Temperature** | -20°C to +80°C | | **Mounting Type** | Surface Mount (SMD) | | **Package Size** | 7.2mm x 3.0mm (Approx.) | | **Resonance Resistance** | 50 Ω (Maximum) | --- ## 2. Key Features and Construction This component is more than just a simple crystal; it integrates several functions into a single package: * **Piezoelectric Ceramic:** Unlike quartz crystals, these use piezoelectric ceramics to create mechanical resonance. * **Built-in Capacitors:** The "CST" prefix indicates that the unit includes internal load capacitors. This simplifies the PCB design because you do not need to add external capacitors to the oscillator circuit. * **Small Footprint:** Designed for high-density surface mounting, saving significant board space. * **Cost-Effective:** Ceramic resonators are generally cheaper than quartz crystals, though they offer slightly lower frequency stability. --- ## 3. Circuit Application In a typical microcontroller circuit, the CSTCC2M40G56-R0 is connected to the `OSC_IN` and `OSC_OUT` pins. Because the capacitors are internal, the center pin is connected to Ground (GND). ```mermaid graph LR MCU_OSC_IN --- Resonator_Pin1 GND --- Resonator_Pin2(Center) MCU_OSC_OUT --- Resonator_Pin3 ``` --- ## 4. Common Use Cases The 2.40 MHz frequency is commonly used in legacy 8-bit or 16-bit microcontrollers where high-speed processing is not required, but low power and cost are priorities. Applications include: * Household appliances (Washing machines, Microwaves). * Remote controls. * Inexpensive consumer electronics. * Automotive body control modules (non-critical systems).