The **MHO+51TCD-R** is a specific model of a **Quartz Crystal Oscillator**, typically manufactured by companies like **Mercury Electronic**. These components are fundamental in electronics for generating a stable clock signal required by microprocessors and digital circuits. --- ### 1. Technical Specifications The part number follows a specific nomenclature that defines its electronic characteristics: | Feature | Specification | Description | | :--- | :--- | :--- | | **Type** | TCXO | Temperature Compensated Crystal Oscillator. | | **Output Type** | CMOS / TTL | Standard logic levels for digital circuits. | | **Package** | 14-pin DIP (Full size) | Through-hole rectangular metal can. | | **Stability** | ±1.5 ppm to ±5.0 ppm | High precision across temperature ranges. | | **Voltage** | 5.0V (Standard) | Standard operating voltage for "5" series. | | **Frequency Range** | 1.0 MHz ~ 160 MHz | Varies based on specific factory calibration. | --- ### 2. Key Components & Construction The "MHO" series is built using several internal electronic sub-parts integrated into the metal housing: 1. **Quartz Crystal Blank:** The core vibrating element that determines the fundamental frequency. 2. **Compensation Network:** A specialized circuit (thermistor-based) that adjusts the capacitance to counteract frequency drift caused by temperature changes. 3. **Oscillator IC:** An internal integrated circuit that maintains the oscillation and provides the output buffer. 4. **Metal Shielding:** The outer casing acts as a Faraday cage to protect the signal from Electromagnetic Interference (EMI). --- ### 3. Pin Configuration (Internal Mapping) Since this is a standard 14-pin DIP package, only four pins are typically functional: | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | NC or Vcont | No connection or Voltage Control (if it's a VCTCXO). | | **7** | GND | Circuit Ground. | | **8** | Output | The generated clock signal (Square wave). | | **14** | Vdd | Power Supply (+5V). | --- ### 4. Applications Because the **TCD** variant offers temperature compensation, it is used in environments where frequency stability is critical: * **Telecommunications:** Base stations and radio hardware. * **Measurement Tools:** Frequency counters and high-end multimeters. * **Legacy Computing:** Industrial motherboards requiring stable 5V timing signals. ---