The **CSTCE20M0V51-R0** is a ceramic resonator manufactured by **Murata Electronics**. It belongs to the CERALOCK® family, which are high-accuracy frequency control components often used as a cost-effective alternative to quartz crystals. --- ## 1. Technical Specifications The following table summarizes the key electrical and physical characteristics: | Parameter | Specification | | :--- | :--- | | **Nominal Frequency** | 20.000 MHz | | **Frequency Tolerance** | ±0.5% | | **Operating Temperature** | -20°C to +80°C | | **Load Capacitance** | 5pF (Internal) | | **Mounting Type** | Surface Mount (SMD) | | **Package Size** | 3.2 x 1.3 mm (EIA 1205) | | **Frequency Stability** | ±0.3% over temperature | --- ## 2. Key Features * **Built-in Capacitance:** This specific model includes internal load capacitors. This eliminates the need for two external capacitors on the PCB, saving space and reducing BOM (Bill of Materials) costs. * **Miniaturization:** The low-profile, small-footprint design is ideal for high-density circuit boards. * **Stability:** While not as precise as a quartz crystal (which usually has tolerances in ppm), ceramic resonators provide sufficient stability for most microcontroller (MCU) clocking needs. * **Fast Startup:** Ceramic resonators typically have a faster oscillation start-up time compared to quartz crystals. --- ## 3. Pin Configuration and Circuitry The device features a 3-terminal structure: 1. **Input:** Connected to the MCU's `OSC_IN` or `XTAL1`. 2. **Ground:** Connected to the system ground (GND). This terminal is shared by the internal capacitors. 3. **Output:** Connected to the MCU's `OSC_OUT` or `XTAL2`. ### Typical Application Diagram ```text Microcontroller +---------------+ | | | [OSC_IN] [OSC_OUT] +-------+-------+ | | +------+-------+------+ | (1) (2) (3) | | [ IN ] [GND] [ OUT] | <-- CSTCE20M0V51-R0 +---------------------+ ``` --- ## 4. Common Applications * **Microcontrollers:** Serving as the main clock source for 8-bit or 16-bit MCUs. * **Consumer Electronics:** Remote cleans, kitchen appliances, and toys. * **Communication:** USB peripherals and high-speed data transfer interfaces where ±0.5% accuracy is acceptable. * **Automotive:** (Note: This specific part is generally commercial grade; automotive-grade versions usually have different suffixes like 'A').