The **CSTCC3M50G56-R0** is a surface-mount (SMD) ceramic resonator manufactured by **Murata Electronics**. It belongs to the CERALOCK® line, which provides a cost-effective alternative to quartz crystals for timing and clock generation in microcontroller circuits. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Nominal Frequency** | 3.50 MHz | | **Frequency Tolerance** | ±0.5% | | **Built-in Capacitance** | 47 pF (Internal load capacitors) | | **Operating Temperature** | -20°C to +80°C | | **Mounting Type** | Surface Mount (SMD) | | **Package Size** | 7.2mm x 3.0mm (Approx.) | | **Frequency Stability** | ±0.3% over temperature | --- ### 2. Functional Characteristics #### Internal Load Capacitors One of the defining features of the "G" series (like the CSTCC) is the **built-in load capacitance**. * Standard crystals require two external ceramic capacitors to complete the oscillation circuit. * The CSTCC3M50G56-R0 has these integrated internally. This saves PCB space and reduces the Bill of Materials (BOM) count. #### Ceramic vs. Quartz * **Precision:** Ceramic resonators are less precise than quartz crystals (±0.5% vs. ±0.005%). * **Startup Time:** Ceramic resonators have a much faster "start-up" time than crystals. * **Cost:** They are generally more affordable and more physically rugged against vibration and shock. --- ### 3. Pinout and Circuit Application The device typically has **three terminals**: 1. **Input (Osc1):** Connected to the MCU clock input. 2. **Ground:** Connected to the system ground (common for internal capacitors). 3. **Output (Osc2):** Connected to the MCU clock output. ```mermaid graph LR MCU_In --| | Resonator_Pin1 GND --| | Resonator_Pin2_GND MCU_Out --| | Resonator_Pin3 ``` --- ### 4. Common Applications Due to its 3.50 MHz frequency and moderate tolerance, it is commonly found in: * **Consumer Electronics:** Remote controls, toys, and small appliances. * **Microcontrollers:** Serving as the external clock source for 8-bit or 16-bit MCUs. * **Communication:** Low-speed data transfer protocols where high-precision timing isn't critical.