Based on the part number **M7S55FAJ-R**, this component belongs to the **M7S series** of high-performance crystal oscillators manufactured by **NDK (Nihon Dempa Kogyo Co., Ltd.)**. Below is a detailed breakdown of its electronic specifications and characteristics. --- ### 1. General Specifications The M7S series is a line of SPXO (Simple Packaged Crystal Oscillators) known for their high frequency stability and compact surface-mount design. | Feature | Specification Details | | :--- | :--- | | **Manufacturer** | NDK (Nihon Dempa Kogyo) | | **Part Series** | M7S Series | | **Output Type** | CMOS / TTL Compatible | | **Package Size** | 7.0 x 5.0 mm (Standard 7050 SMD) | | **Supply Voltage ($V_{CC}$)** | Typically 3.3V or 5.0V (depending on sub-code) | | **RoHS Status** | Compliant (Lead-Free) | --- ### 2. Functional Block Breakdown A crystal oscillator like the M7S55FAJ-R integrates several electronic sub-components into a single ceramic package: 1. **AT-Cut Quartz Crystal Unit:** The heart of the part, providing the mechanical resonance. 2. **Oscillation IC:** A specialized CMOS IC that maintains the vibration of the crystal and converts it into a square wave signal. 3. **Output Buffer:** Ensures the signal is strong enough to drive the load of the target PCB trace without degrading. 4. **Standby/Tri-state Function:** Usually allows the clock output to be disabled to save power in mobile or battery-operated devices. --- ### 3. Pin Configuration The M7S55FAJ-R typically follows the standard 4-pad layout for 7050 oscillators: | Pin Number | Function | Description | | :--- | :--- | :--- | | **#1** | Standby or NC | High or Open = Output Enabled; Low = High Impedance | | **#2** | GND | Ground Connection | | **#3** | Output | The generated clock signal (Square Wave) | | **#4** | $V_{CC}$ | Positive Supply Voltage | --- ### 4. Key Performance Characteristics * **Frequency Stability:** Usually ranges from $\pm20$ ppm to $\pm100$ ppm depending on the specific suffix, covering temperature fluctuations. * **Operating Temperature:** Typically rated for $-40^\circ\text{C}$ to $+85^\circ\text{C}$ (Industrial grade). * **Low Phase Jitter:** Designed for high-speed data applications where timing precision is critical. ### 5. Common Applications * **Networking:** Switches, routers, and gateways. * **Industrial:** PLCs (Programmable Logic Controllers) and automation sensors. * **Computing:** High-speed motherboards and peripheral interfaces. ---