The **CSTCC2M45G56-R0** is a specific type of Surface Mount (SMD) Ceramic Resonator manufactured by **Murata Electronics**. It belongs to the CERALOCK® family and is primarily used for clock generation in microprocessors and microcontrollers. --- ### 1. Key Technical Specifications | Parameter | Specification | |:--- |:--- | | **Nominal Frequency** | 2.45 MHz | | **Frequency Tolerance** | ±0.5% | | **Resonant Impedance** | 80 Ω (max) | | **Capacitance (Built-in)** | 47 pF | | **Temperature Stability** | ±0.3% (-20°C to +80°C) | | **Mounting Type** | Surface Mount (SMD) | | **Dimensions** | 7.2mm x 3.0mm x 1.8mm | --- ### 2. Functional Description The CSTCC2M45G56-R0 acts as a frequency-determining element. It utilizes the mechanical resonance of piezoelectric ceramics. * **Integrated Capacitors:** Unlike standard crystals that require external load capacitors, this "CSTCC" series has **built-in load capacitors**. This reduces the component count and saves PCB space. * **Piezoelectric Effect:** It converts electrical energy into mechanical vibrations and back, providing a stable clock signal when paired with an integrated circuit's oscillator pins. --- ### 3. Physical Layout and Pinout This device typically features **3 terminals**: 1. **Input:** Connected to the XTAL_IN of the MCU. 2. **Ground:** Connected to the system ground (shared by the internal capacitors). 3. **Output:** Connected to the XTAL_OUT of the MCU. --- ### 4. Comparison: Ceramic Resonator vs. Quartz Crystal | Feature | Ceramic Resonator (CSTCC) | Quartz Crystal | |:--- |:--- |:--- | | **Cost** | Lower | Higher | | **Precision** | Moderate (±0.5%) | High (±0.001%) | | **Startup Time** | Fast | Slow | | **Built-in Caps** | Yes (often) | No | --- ### 5. Common Applications * **Microcontrollers:** Serving as the system clock for 8-bit or 16-bit MCUs. * **Consumer Electronics:** Remote controls, toys, and small appliances. * **Communication Equipment:** Low-speed data processing units where high precision (PPM levels) is not critical.