The **CSTCE12M2G55Z-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 timing and clock generation in microcontrollers. --- ## 1. Technical Specifications The following table summarizes the key electrical and physical parameters of this component: | Parameter | Specification | | :--- | :--- | | **Oscillation Frequency** | 12.000 MHz | | **Frequency Tolerance** | ±0.5% | | **Frequency Stability** | ±0.3% | | **Built-in Capacitance** | 33 pF (Internal) | | **Operating Temperature** | -40°C to +125°C | | **Package Type** | SMD (Small Cap Chip Type) | | **Dimensions** | 3.2mm x 1.3mm | | **Mounting Type** | Surface Mount (SMT) | --- ## 2. Key Internal Components The CSTCE series is unique because it integrates several passive elements into a single miniature package: ### A. Piezoelectric Ceramic Element The core is a ceramic plate that exhibits the piezoelectric effect. When an electrical signal is applied, it vibrates at a specific resonant frequency (12 MHz). Ceramic resonators have a faster "start-up" time compared to quartz crystals. ### B. Built-in Load Capacitors Unlike traditional 2-pin crystals that require external capacitors (C1 and C2) to stabilize the oscillation, the **CSTCE** series features three terminals. The middle terminal is grounded, and the two internal 33pF capacitors are already connected. * **Benefit:** Reduces component count and saves PCB space. --- ## 3. Pin Configuration The device features 3 pads on the bottom of the SMD package: 1. **Input (Osc1):** Connected to the XTAL input of the MCU. 2. **Ground (GND):** The center pin, must be connected to the system ground. 3. **Output (Osc2):** Connected to the XTAL output of the MCU. --- ## 4. Applications Due to its high-temperature rating (up to 125°C) and compact size, this part is commonly found in: * **Automotive Electronics:** Powertrain control, safety systems, and body electronics. * **Consumer Electronics:** Remote controls, home appliances, and toys. * **Industrial:** Basic logic timing for PLC modules or sensor nodes. ---