### Overview: MHO+42FCG-R The **MHO+42FCG-R** is a high-precision, temperature-compensated crystal oscillator (TCXO) module. These components are primarily used in telecommunications, networking, and GPS hardware where timing stability is critical despite environmental temperature changes. --- ### Technical Specifications Below are the typical electronic characteristics associated with this specific part series: | Parameter | Specification | | :--- | :--- | | **Component Type** | TCXO (Temperature Compensated Crystal Oscillator) | | **Package Style** | 4-Pad SMD (Surface Mount Device) | | **Dimensions** | Typically 5.0 x 3.2 mm or 7.0 x 5.0 mm | | **Output Type** | CMOS / Clipped Sine Wave | | **Supply Voltage (Vcc)** | Usually 3.3V (standard for the "42" series) | | **Frequency Stability** | ±0.5ppm to ±2.5ppm (depending on grade) | | **Operating Temp Range** | -40°C to +85°C | --- ### Key Electronic Internal Parts A TCXO like the MHO+42FCG-R is not a simple crystal; it is an integrated circuit assembly containing several functional blocks: 1. **Quartz Crystal Resonator:** The heart of the part, providing the base mechanical vibration at a specific frequency. 2. **Compensation Network:** A temperature sensor (thermistor) and a compensation circuit that adjusts the load capacitance of the crystal to counteract frequency drift caused by heat or cold. 3. **Oscillator IC:** An active circuit that maintains the oscillation of the crystal. 4. **Voltage Regulator (Internal):** Ensures that small fluctuations in the input power supply do not affect the frequency output. 5. **Output Buffer:** A stage that ensures the signal is strong enough to drive the next component in the system without "loading down" the oscillator. --- ### Pin Configuration (Typical) For the SMD package, the pins are generally assigned as follows: * **Pin 1:** NC (No Connection) or Vcon (Voltage Control for VCTCXO variants). * **Pin 2:** GND (Ground). * **Pin 3:** Output (The clock signal). * **Pin 4:** Vcc (Supply Voltage). --- ### Applications The "R" suffix often denotes **RoHS Compliance**, making it suitable for modern environmentally-conscious manufacturing. Common uses include: * **Wireless Communication:** Base stations and point-to-point radio. * **GPS Receivers:** Where precise timing is needed to calculate position. * **Ethernet Switches:** Synchronizing data packets across high-speed networks.