The **CSTCC3M68G53-R0** is a surface-mount (SMD) ceramic resonator produced by **Murata Manufacturing Co., Ltd.** It is part of the CERALOCK® line, designed to provide a stable clock signal for microcontrollers and other digital circuits. --- ## 1. Technical Specifications The following table outlines the key electrical and physical characteristics of the component: | Feature | Specification | | :--- | :--- | | **Nominal Frequency** | 3.68 MHz | | **Initial Tolerance** | ±0.5% | | **Built-in Load Capacitance** | 15 pF | | **Frequency Stability** | ±0.3% (over temperature range) | | **Temperature Range** | -20°C to +80°C | | **Mounting Type** | Surface Mount (SMD) | | **Package Size** | 7.2 x 3.0 mm | --- ## 2. Key Internal Components The CSTCC3M68G53-R0 is more than just a vibrating element; it is an integrated timing solution. ### A. Piezoelectric Ceramic Element The core is a high-quality piezoelectric ceramic. When an electric field is applied, it vibrates at its mechanical resonance frequency (3.68 MHz). Ceramic resonators are generally more robust and start up faster than quartz crystals, though they are slightly less precise. ### B. Built-in Load Capacitors The "CST" prefix indicates that this part includes **internal load capacitors**. - In traditional crystal circuits, you must add two external capacitors (usually 15-22pF) to ground. - In this part, those capacitors are integrated into the package. - **Benefit:** Reduces component count, saves PCB space, and lowers assembly costs. --- ## 3. Pin Configuration and Circuitry The device typically has 3 terminals: 1. **Input (1):** Connects to the OSC_IN of the microcontroller. 2. **Ground (2):** The center pin, which must be connected to the system ground (GND) for the internal capacitors to function. 3. **Output (3):** Connects to the OSC_OUT of the microcontroller. ### Typical Application Diagram ```text Microcontroller +---------------+ | | | OSC1 OSC2 | +----|------|---+ | | +----|------|----+ | 1 3 | | [Resonator] | | 2 | +--------|-------+ | Ground ``` --- ## 4. Usage Considerations * **Frequency Accuracy:** With a ±0.5% tolerance, it is ideal for general-purpose microcontrollers, remote controls, and toys. It is **not** recommended for high-speed communication protocols (like high-speed USB) that require the extreme precision of a quartz crystal (±0.001%). * **Space Saving:** Because it uses the "CC" package (7.2x3.0mm), it is relatively large compared to modern 2.0x1.6mm resonators, but it is very reliable for industrial and legacy applications. * **RoHS Compliance:** The "-R0" suffix typically denotes the packaging style (tape and reel) and ensures compliance with environmental lead-free standards. ---