The **M7S21FCJ-R** belongs to a specific category of high-performance components, typically categorized as a **Surface Mount (SMD) Quartz Crystal Oscillator**. These components are essential for providing a stable clock frequency to microprocessors, DSPs, and other digital circuits. --- ### 1. General Specifications While specific datasheets can vary by manufacturer (often associated with brands like **Hosonic** or **Kyocera**), the "M7S" series generally follows these technical parameters: | Feature | Typical Specification | | :--- | :--- | | **Component Type** | XO (Crystal Oscillator) | | **Package Size** | 7.0 x 5.0 mm (4 Pads) | | **Output Type** | CMOS / TTL Compatible | | **Supply Voltage (Vdd)** | Usually 3.3V or 5.0V | | **Frequency Range** | 1.000 MHz to 150.000 MHz | | **Operating Temperature** | -40°C to +85°C (Industrial Grade) | --- ### 2. Breakdown of the Part Number Though naming conventions differ, the suffix codes usually represent the following: * **M7S**: Series identifier (7x5mm package size). * **21**: Often refers to frequency stability (e.g., ±25ppm or ±50ppm). * **FC**: Functional code (Output type, typically CMOS). * **J**: Operating temperature range (Standard or Industrial). * **-R**: RoHS Compliant / Lead-Free. --- ### 3. Pin Configuration For a standard 7050 (7.0x5.0mm) 4-pad oscillator like the M7S, the pinout is almost always standardized: | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | **OE or NC** | Output Enable (High = Active) or No Connection | | **2** | **GND** | Ground / Case Connection | | **3** | **Output** | Clock Signal Output | | **4** | **Vdd** | Power Supply Voltage | --- ### 4. Key Applications Because of its size and stability, the M7S21FCJ-R is commonly found in: 1. **Networking Hardware:** Routers, switches, and modems. 2. **Industrial Controllers:** PLC units and automation sensors. 3. **Computing:** Motherboards and peripheral interface cards. 4. **Audio/Video:** Digital signal processing for high-fidelity equipment. --- ### 5. Schematic Symbol Representation ```text +-----------+ (1)-| OE Vdd |-(4) | | (2)-| GND OUT |-(3) +-----------+ ```