The **MHO+42TFG-R** is a high-precision, temperature-compensated crystal oscillator (TCXO) manufactured by **Mercury Electronic**. It is designed for applications requiring high stability in a small form factor, commonly used in telecommunications, GPS, and wireless networking. --- ### 1. Key Technical Specifications The model number "MHO+42TFG-R" encodes specific technical characteristics: | Parameter | Specification | Description | | :--- | :--- | :--- | | **Component Type** | TCXO / VCTCXO | Temperature Compensated Crystal Oscillator | | **Package Size** | 7.0 x 5.0 mm | Standard 4-pad or 6-pad SMD package | | **Supply Voltage** | 3.3V (Typical) | Standard logic level power supply | | **Frequency Stability** | ±2.5 ppm | Stability over the operating temperature range | | **Output Type** | HCMOS / CMOS | Square wave output for digital logic | | **Operating Temp** | -40°C to +85°C | Industrial grade temperature range | | **RoHS Status** | Compliant (-R) | Lead-free and environmentally friendly | --- ### 2. Functional Components Internally, the MHO+42TFG-R consists of several integrated electronic parts: 1. **Quartz Crystal Resonator:** The heart of the part, providing the base vibration frequency. 2. **Compensation Network:** A thermistor-based circuit that senses temperature changes and adjusts the load capacitance to keep the frequency stable. 3. **Oscillator IC:** An integrated circuit that maintains the oscillation and buffers the output signal. 4. **Voltage Regulator (Internal):** Ensures that small fluctuations in the supply voltage do not affect the frequency accuracy. --- ### 3. Pin Configuration (Typical 7x5mm SMD) | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | Vcon / NC | Voltage Control (if VCTCXO) or No Connection | | **2** | GND | Ground | | **3** | Output | The HCMOS frequency output signal | | **4** | Vdd | Positive Power Supply (+3.3V) | --- ### 4. Application Areas Due to its high stability and compact size, this part is typically used in: * **Networking:** Synchronous Ethernet, routers, and switches. * **Wireless:** Wi-Fi 6, Bluetooth modules, and Zigbee. * **GNSS/GPS:** Providing the clock source for satellite positioning systems. * **Test Equipment:** Portable frequency counters and handheld signal analyzers. ---