The **CSTCC2M40G56A-R0** is a specific surface-mount ceramic resonator manufactured by **Murata Electronics**. It belongs to the CERALOCK® family, which is widely used as a cost-effective alternative to quartz crystals for providing a clock signal to microprocessors and microcontrollers. --- ## 1. Technical Specifications The following table outlines the key electrical and physical parameters of this component: | Parameter | Specification | | :--- | :--- | | **Nominal Frequency** | 2.40 MHz | | **Frequency Tolerance** | ±0.5% | | **Frequency Stability** | ±0.3% (over operating temp) | | **Built-in Load Capacitance** | 47 pF (Internal) | | **Operating Temperature** | -20°C to +80°C | | **Mounting Type** | Surface Mount (SMD) | | **Package Size** | 7.2 x 3.0 mm | --- ## 2. Key Features and Internal Components The CSTCC series is distinguished by its integration of internal components, which simplifies circuit design. ### A. Built-in Load Capacitors Unlike traditional quartz crystals that require two external ceramic capacitors to function, the "CST" series includes **built-in load capacitors**. * **Benefit:** This saves PCB space, reduces the Bill of Materials (BOM), and minimizes parasitic interference. * **Circuitry:** It is a 3-terminal device (Input, Ground, Output). ### B. Piezoelectric Ceramic Material It utilizes the mechanical vibration of a piezoelectric ceramic element. When an electrical signal is applied, the material vibrates at its resonant frequency (2.40 MHz), providing a stable timing reference. --- ## 3. Pin Configuration Since this is a 3-terminal resonator, the layout is typically as follows: | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | Input | Connected to the oscillator input of the IC. | | **2** | Ground | Connected to the system ground (GND). | | **3** | Output | Connected to the oscillator output of the IC. | --- ## 4. Common Applications Due to its 2.40 MHz frequency and standard stability, it is commonly used in: * **Microcontroller Clocks:** Providing the heartbeat for 8-bit or 16-bit MCUs. * **Consumer Electronics:** Remote controls, toys, and small appliances. * **Automotive/Industrial:** Non-safety critical timing (e.g., body control modules or status displays). --- ## 5. Comparison: Resonator vs. Crystal | Feature | Ceramic Resonator (CSTCC) | Quartz Crystal | | :--- | :--- | :--- | | **Accuracy** | Moderate (±0.5%) | High (±0.001%) | | **Cost** | Low | Higher | | **Start-up Time** | Very Fast | Slower | | **Size** | Smaller (Internal Caps) | Larger (External Caps needed) |