## Overview of CSTCE8M31G55-R0 The **CSTCE8M31G55-R0** is a surface-mount (SMD) ceramic resonator produced by **Murata Manufacturing Co., Ltd.** It belongs to the CERALOCK® family, which is widely used as a clock source for microcontrollers in various electronic applications. --- ### 1. Key Technical Specifications | Parameter | Value | | :--- | :--- | | **Nominal Frequency** | 8.310 MHz | | **Frequency Tolerance** | ±0.5% | | **Resonant Impedance** | 40 Ω (max) | | **Built-in Capacitance** | 33 pF (CL1 and CL2) | | **Operating Temperature** | -20°C to +80°C | | **Package / Case** | 3.2 x 1.3 mm (SMD) | | **Mounting Type** | Surface Mount | --- ### 2. Physical Structure and Pinout The "CSTCE" series is characterized by its small size and **three-terminal** design. Unlike a standard crystal that usually requires external load capacitors, this part integrates them internally. 1. **Terminal 1 (Input):** Connected to the oscillator input of the MCU. 2. **Terminal 2 (GND):** The center pin, connected to the ground. 3. **Terminal 3 (Output):** Connected to the oscillator output of the MCU. --- ### 3. Core Features * **Integrated Capacitors:** The "G" in the part number indicates built-in load capacitors (33pF). This reduces the component count on the PCB and saves space. * **High Stability:** While not as precise as a quartz crystal, ceramic resonators offer much better stability than internal RC oscillators in microcontrollers. * **Fast Startup:** Ceramic resonators have a lower Q-factor than crystals, allowing them to reach stable oscillation much faster after power-on. * **Cost-Effective:** They are generally cheaper than quartz crystals, making them ideal for high-volume consumer electronics. --- ### 4. Common Applications This specific frequency (8.31 MHz) and form factor are typically used in: * **Microcontrollers (MCUs):** Providing the main system clock for 8-bit or 16-bit processors. * **Consumer Electronics:** Remote cleans, toys, and small household appliances. * **Communication Equipment:** Low-speed data processing units. * **USB/Peripheral Interfaces:** Where high-precision timing is not strictly required. --- ### 5. Part Number Breakdown (Naming Convention) | Code Segment | Meaning | | :--- | :--- | | **CSTCE** | Series name (SMD Ceramic Resonator with built-in caps) | | **8M31** | Nominal Frequency (8.31 MHz) | | **G** | Load Capacitance type (Built-in 33pF) | | **55** | Individual specification/Tolerance code | | **-R0** | Packaging (Plastic tape / Reel) | ---