The **CSTCW33M8X53-R0** is a ceramic resonator from the **CERALOCK®** series manufactured by **Murata Electronics**. It is widely used in microcontrollers and timing circuits as a cost-effective, compact alternative to quartz crystals. --- ### 1. Key Specifications The following table highlights the primary electrical and physical characteristics of this component: | Parameter | Specification | | :--- | :--- | | **Nominal Frequency** | 33.868 MHz | | **Frequency Tolerance** | ±0.5% | | **Frequency Stability** | ±0.3% (Over temp range) | | **Operating Temperature** | -20°C to +80°C | | **Built-in Load Capacitance** | Yes (approx. 5pF) | | **Mounting Type** | Surface Mount (SMD) | | **Package Size** | 2.5mm x 2.0mm (W x L) | --- ### 2. Core Features * **Built-in Capacitors:** Unlike standard crystals that require external load capacitors, this part has internal capacitors. This reduces the component count on the PCB and saves space. * **High-Frequency Precision:** Operating at 33.868 MHz, it is specifically tuned for high-speed clocking requirements. * **Small Form Factor:** The "W" in the series name signifies a wash-type, small-scale SMD package, making it ideal for high-density circuit boards. * **Cost-Effectiveness:** Ceramic resonators are generally more affordable than quartz crystals, though they offer slightly lower frequency stability. --- ### 3. Pin Configuration and Circuitry The device typically features three pads (terminals). In a standard Pierce oscillator circuit (used by most microcontrollers), the wiring is simplified: ```mermaid graph LR A[MCU OSC_IN] --- B[Resonator Pin 1] C[GND] --- D[Resonator Pin 2 - Center] E[MCU OSC_OUT] --- F[Resonator Pin 3] ``` * **Pin 1 & 3:** Connected to the oscillator input/output of the IC. * **Pin 2 (Middle):** Connected to Ground (GND) to utilize the internal load capacitors. --- ### 4. Common Applications Due to its specific frequency and reliability, it is commonly found in: 1. **Audio/Video Equipment:** The 33.868 MHz frequency is often used in digital audio processing and CD/DVD player clocking. 2. **Microcontrollers:** Serving as the external clock source for high-speed 8-bit or 32-bit MCUs. 3. **Communication Peripherals:** USB or Ethernet controllers that require stable, high-speed timing.