The **M3A13TCG-R** is a high-performance, industrial-grade Crystal Oscillator manufactured by **NDK (Nihon Dempa Kogyo)**. It is part of the SPXO (Simple Packaged Crystal Oscillator) category, specifically designed for high-speed networking and telecommunications. ### Technical Specifications | Parameter | Specification | | :--- | :--- | | **Component Type** | SPXO (Crystal Oscillator) | | **Output Type** | LVPECL (Low-Voltage Positive Emitter-Coupled Logic) | | **Standard Frequency** | Typically 156.25 MHz (Common for Ethernet) | | **Supply Voltage ($V_{cc}$)** | +3.3V | | **Operating Temp Range** | -40°C to +85°C (Industrial Grade) | | **Package Size** | 7.0 x 5.0 mm (6 pads) | | **Frequency Stability** | ±50 ppm (Total Frequency Tolerance) | --- ### Key Electronic Components & Design The M3A13TCG-R is not a single "part" but an integrated module consisting of several internal electronic stages: 1. **AT-Cut Quartz Crystal**: The heart of the device. It provides the mechanical resonance required for frequency stability. 2. **Oscillator IC**: An internal CMOS/BiCMOS integrated circuit that drives the crystal and maintains the oscillation. 3. **LVPECL Output Driver**: * This specific part uses **LVPECL** logic. * **Advantage**: It offers very low phase jitter and high-speed switching, making it ideal for fiber optic modules and high-speed backplanes. 4. **Tri-state Function (OE)**: Pin 1 usually serves as the Output Enable (OE). When set high, the clock signals are active; when low, the output goes into a high-impedance state to save power. ### Pin Configuration | Pin Number | Function | Description | | :--- | :--- | :--- | | 1 | OE (Output Enable) | High: Output active; Low: High Z | | 2 | NC | No internal connection | | 3 | GND | Ground connection | | 4 | OUT | Positive Output signal | | 5 | #OUT | Complementary (Negative) Output signal | | 6 | $V_{cc}$ | Power Supply (+3.3V) | --- ### Typical Applications Due to its high frequency and low jitter characteristics, the M3A13TCG-R is commonly found in: * **10G/40G/100G Ethernet** switches and routers. * **Fiber Channel** host bus adapters. * **SONET/SDH** optical transmission equipment. * **Storage Area Networks (SAN)**. ---