The **2JS7-R** is a specific electronic component, primarily categorized as a **Surface Mount (SMD) Ceramic Resonator** or, in some contexts, a part of a specialized connector series depending on the manufacturer (most commonly associated with **Murata** or **Kyocera** timing devices). Below is a breakdown of its technical specifications and characteristics. --- ## 1. Core Technical Specifications The "2JS" series typically refers to Piezoelectric components used for frequency control. | Feature | Specification (Standard) | | :--- | :--- | | **Component Type** | Ceramic Resonator | | **Mounting Type** | Surface Mount Device (SMD) | | **Frequency Range** | Typically 2.00 MHz to 12.00 MHz | | **Frequency Tolerance** | ±0.5% | | **Operating Temperature** | -20°C to +80°C | | **Packaging** | Tape & Reel ("-R" suffix) | --- ## 2. Part Number Breakdown Electronic components follow a specific nomenclature. Here is how to read the **2JS7-R**: * **2JS**: Series identifier. Indicates a ceramic resonator with built-in load capacitors (3-terminal device). * **7**: Often refers to the physical size/dimensions or a specific frequency constant (e.g., 7.xx MHz). * **-R**: Stands for **RoHS Compliant** or **Tape & Reel Packaging**, indicating it is ready for automated pick-and-place assembly. --- ## 3. Key Electronic Characteristics ### Built-in Capacitance Unlike standard crystals that require external load capacitors to oscillate, the 2JS series usually features **built-in capacitors**. This: * Reduces the total component count on the PCB. * Saves board space. * Simplifies the circuit design. ### Structural Design It consists of a piezoelectric ceramic element (Lead Zirconate Titanate) housed in a plastic or ceramic package. It uses mechanical vibration to create a precise electrical signal. --- ## 4. Common Applications The 2JS7-R is used in circuits where a stable clock signal is required but the extreme precision of a Quartz Crystal is not necessary. * **Microcontrollers:** Providing the clock pulse for 8-bit or 16-bit MCUs. * **Consumer Electronics:** Remote controls, toys, and small household appliances. * **Peripherals:** Computer mice, keyboards, and USB hubs. * **Automotive:** Non-safety critical systems like power windows or dashboard displays. --- ## 5. Comparison: Resonator vs. Crystal | Feature | Ceramic Resonator (2JS7-R) | Quartz Crystal | | :--- | :--- | :--- | | **Accuracy** | Moderate (±0.5%) | High (±0.001%) | | **Cost** | Low | Higher | | **Start-up Time** | Very Fast | Slower | | **Size** | Smaller (Integrated Caps) | Larger (Requires External Caps) | ---