## CSTCE13M5G55-R0 Technical Overview The **CSTCE13M5G55-R0** is a high-precision surface-mount **Ceramic Resonator** manufactured by **Murata Electronics**. It belongs to the **CERALOCK®** family, which utilizes the mechanical resonance of piezoelectric ceramics to provide stable clock frequencies for microcontrollers and other digital circuits. --- ### 1. Key Technical Specifications | Parameter | Value / Specification | | :--- | :--- | | **Nominal Frequency** | 13.56 MHz | | **Frequency Tolerance** | ±0.5% | | **Frequency Stability** | ±0.3% (over temperature) | | **Operating Temperature** | -20°C to +80°C | | **Load Capacitance** | 33 pF (Built-in) | | **Mounting Type** | Surface Mount (SMD) | | **Package Size** | 3.2 x 1.3 mm | | **Resonant Impedance** | 50 Ω (Maximum) | --- ### 2. Physical Structure and Pinout This device is a **3-terminal** component. Unlike traditional 2-pin crystals, the CSTCE series integrates load capacitors internally, saving significant PCB space. * **Pin 1:** Input * **Pin 2:** Ground (GND) * **Pin 3:** Output --- ### 3. Core Advantages 1. **Space Efficiency:** By integrating the load capacitors (33pF), it eliminates the need for two external capacitors on the board. 2. **Cost-Effective:** Generally cheaper than quartz crystals while offering sufficient stability for most consumer electronics. 3. **High Reliability:** Highly resistant to mechanical vibration and shock compared to fragile quartz oscillators. 4. **No Adjustment Needed:** Since capacitors are internal, the circuit design is simplified, and frequency deviation due to board stray capacitance is minimized. --- ### 4. Typical Applications The 13.56 MHz frequency is highly standardized, making this part common in: * **NFC/RFID Modules:** 13.56 MHz is the standard frequency for Near Field Communication. * **Microcontrollers (MCUs):** Used as the primary system clock for various 8-bit or 32-bit MCUs. * **USB Peripherals:** Providing the timing signal for low-to-full speed USB devices. * **Consumer Electronics:** Remote controls, toys, and small appliances. --- ### 5. Schematic Representation In a standard circuit, you connect the resonator directly to the `OSC_IN` and `OSC_OUT` pins of your microcontroller, with the center pin connected to ground. ```mermaid graph LR MCU_OSC_IN --- Pin1[Resonator Pin 1] GND --- Pin2[Resonator Pin 2 - Center] MCU_OSC_OUT --- Pin3[Resonator Pin 3] ```