The **CSTCE19M2V51-R0** is a surface-mount (SMD) ceramic resonator from the **CERALOCK®** line manufactured by **Murata Electronics**. Ceramic resonators are used as timing devices to provide stable clock frequencies for microcontrollers (MCUs) and other digital ICs. --- ## 1. Technical Specifications Below are the primary electrical and physical characteristics of this component: | Parameter | Specification | | :--- | :--- | | **Oscillating Frequency** | 19.200 MHz | | **Frequency Tolerance** | ±0.5% | | **Frequency Stability** | ±0.3% | | **Operating Temperature** | -20°C to +80°C | | **Built-in Capacitance** | 5 pF (Internal Load Capacitors) | | **Mounting Type** | Surface Mount (SMD) | | **Package Size** | 3.2 x 1.3 mm (EIA 1205) | | **Resonant Impedance** | 40 $\Omega$ (Max) | --- ## 2. Key Features * **Built-in Capacitance:** Unlike standard quartz crystals, this part includes internal load capacitors. This eliminates the need for two external capacitors on the PCB, saving space and reducing BOM (Bill of Materials) costs. * **Small Footprint:** Part of the "CSTCE" series, it is designed for high-density mounting. * **Cost-Effective:** Ceramic resonators are generally cheaper than quartz crystals, though they offer slightly less frequency precision. * **Durability:** They are highly resistant to mechanical shock and vibration compared to traditional crystals. --- ## 3. Pin Configuration and Circuitry The device typically has 3 terminals. In a standard microcontroller oscillator circuit, the connections are as follows: 1. **Input (Term 1):** Connected to the MCU's `OSC_IN` pin. 2. **Ground (Term 2):** The center pin is connected to the system ground (GND). This serves as the common point for the internal capacitors. 3. **Output (Term 3):** Connected to the MCU's `OSC_OUT` pin. ### Typical Application Circuit ```text [ Microcontroller ] | | OSC_IN OSC_OUT | | +-----|-------------|-----+ | [Term 1] [Term 3] | | [Term 2] | <-- CSTCE19M2V51-R0 +------------|------------+ | (GND) ``` --- ## 4. Common Applications * **Consumer Electronics:** Handheld devices, remote controls, and home appliances. * **Microcontroller Clocks:** Providing the base clock for 8-bit or 16-bit MCUs where a frequency tolerance of 0.5% is acceptable. * **USB Controllers:** Often used in low-speed USB peripherals.