The **MHO+75TCD-R** is a specific model of high-frequency crystal oscillator (specifically a Temperature Compensated Crystal Oscillator or TCCO/VC-TCXO derivative) often manufactured by companies like **MtronPTI**. These components are critical in telecommunications and radio frequency applications where precise timing and frequency stability are required. --- ### 1. Key Technical Specifications The part number follows a specific nomenclature that defines its electrical characteristics: | Feature | Specification | Description | |:---|:---|:---| | **Frequency Range** | Typically 1.0 MHz to 160 MHz | Depends on specific calibration. | | **Output Type** | CMOS / HCMOS | Provides a square wave digital output. | | **Supply Voltage** | +5.0V or +3.3V DC | Standard logic level power supply. | | **Stability** | ±1.0ppm to ±5.0ppm | High precision over temperature ranges. | | **Package Style** | 14-pin DIP (Half-size or Full) | Through-hole mounting (metal can). | | **Operating Temp** | -40°C to +85°C | Industrial grade temperature rating. | --- ### 2. Internal Electronic Components The device is not just a raw crystal; it is an integrated module containing: 1. **Quartz Crystal Resonator:** The primary heart of the component, precision-cut to vibrate at a specific frequency. 2. **Compensation Network:** Thermistors and capacitors that adjust the load capacitance to counteract frequency "drift" caused by temperature changes. 3. **Oscillator IC:** An active circuit (transistor-based) that maintains the oscillation and converts it into a usable square wave (CMOS). 4. **Voltage Regulator (Internal):** Many high-end models include internal regulation to prevent "jitter" caused by noisy power supplies. --- ### 3. Pin Configuration (Typical 14-Pin DIP) While the metal can has 14 pins, usually only 4 are electrically connected: | Pin Number | Function | Description | |:---:|:---|:---| | **1** | N/C or Control Voltage | Used for fine-tuning frequency (if VC-TCXO). | | **7** | Case Ground | Connects to the system ground and provides shielding. | | **8** | Output | The generated clock signal (square wave). | | **14** | Vcc | Positive power supply input. | --- ### 4. Typical Applications * **Networking Hardware:** Switches and routers requiring stable clocking for data synchronization. * **Radio Transceivers:** Used to maintain stable carrier frequencies in RF communication. * **Test & Measurement:** Oscilloscopes and frequency counters. * **Legacy Computing:** Industrial motherboards that utilize through-hole components for durability.