The **MHO+26TCD-R** is a specific technical designation typically associated with high-precision **Quartz Crystal Oscillators**, specifically within the **TCXO** (Temperature Compensated Crystal Oscillator) category. These components are critical for frequency control in telecommunications and radio frequency applications. --- ### 1. Key Technical Specifications Based on the part number nomenclature, the following technical characteristics are generally defined: | Feature | Specification | Description | | :--- | :--- | :--- | | **Component Type** | TCXO | Temperature Compensated Crystal Oscillator. | | **Package Style** | DIP-14 / Half-Size | Usually a 4-pin metal "can" package for through-hole mounting. | | **Frequency Stability** | ±2.5 ppm to ±5.0 ppm | Maintains precise frequency despite temperature changes. | | **Output Type** | CMOS / TTL | Provides a square wave signal compatible with digital logic. | | **Voltage Supply** | 3.3V or 5.0V | Standard operating voltages for digital circuits. | | **RoHS Status** | Compliant (-R) | The "R" suffix typically denotes lead-free/RoHS compliance. | --- ### 2. Internal Electronic Structure The device is not just a crystal; it is an integrated circuit module containing several electronic stages: 1. **Quartz Crystal Blank:** The heart of the unit, vibrating at a specific resonant frequency (e.g., 26.000 MHz). 2. **Compensation Network:** A thermistor-based circuit that senses ambient temperature and adjusts the load capacitance to keep the frequency stable. 3. **Oscillator IC:** An active circuit that drives the crystal and maintains the oscillation. 4. **Buffer/Output Stage:** Shapes the signal into a clean square wave and provides the drive strength needed for the rest of the PCB. --- ### 3. Pin Configuration (Typical) Most MHO-style oscillators follow a standardized 4-pin layout for Through-Hole Technology (THT): | 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. | | **14** | Vcc | Positive Power Supply. | --- ### 4. Common Applications Because of the "TC" (Temperature Compensation) aspect, these parts are used where standard crystals are too unstable: * **GPS Receivers:** Requiring high timing accuracy. * **Wireless Communication:** Ensuring the radio stays on the correct channel. * **Embedded Systems:** Providing a master clock for microcontrollers in industrial environments. ---