The **MHO+74TFD-R** is a high-precision, surface-mount (SMD) **Temperature Compensated Crystal Oscillator (TCXO)** manufactured by **Mercury Electronic**. These components are critical in telecommunications and radio frequency applications where frequency stability across varying temperatures is required. --- ### ## Technical Specifications Below are the primary electronic characteristics typical of the MHO+ series (specifically the 74TFD-R variant): | Parameter | Specification | | :--- | :--- | | **Component Type** | TCXO (Temperature Compensated Crystal Oscillator) | | **Package Size** | 7.0 x 5.0 mm (6 pads) | | **Output Type** | True Sine Wave / Clipped Sine / CMOS (Varies by sub-spec) | | **Supply Voltage (Vdd)** | +3.3V DC (Standard) | | **Frequency Stability** | ±0.5ppm to ±2.5ppm (Over Temp) | | **Operating Temperature** | -40°C to +85°C (Industrial Grade) | | **RoHS Status** | Compliant (R suffix denotes RoHS) | --- ### ## Breakdown of the Part Number The alphanumeric code provides specific details about the component's construction: * **MHO+**: The series identifier for Mercury's High-Stability Oscillators. * **74**: Indicates the physical package size (7.0 x 5.0 mm). * **TFD**: Represents the internal circuit configuration, frequency adjustment type (Voltage Control or Fixed), and output waveform characteristics. * **-R**: Indicates the part is **RoHS Compliant** (Lead-free). --- ### ## Key Electronic Features 1. **Temperature Compensation**: Unlike standard crystals, this part contains an internal compensation circuit that senses the ambient temperature and adjusts the load capacitance to keep the frequency from drifting. 2. **Low Phase Noise**: Designed for RF applications where signal purity is essential for data integrity. 3. **Low Current Consumption**: Optimized for mobile and battery-operated devices. 4. **Tri-state Function**: Often includes an Enable/Disable pin, allowing the output to be turned off to save power without powering down the entire system. --- ### ## Common Applications * **Wireless Communication**: Base stations, repeaters, and point-to-point radio. * **GPS/GNSS**: High-precision timing for satellite navigation. * **Networking**: Synchronous Ethernet and high-speed routers. * **Test Equipment**: Frequency counters and synthesizers.