The **MHO+71FFD-R** is a specific part number belonging to a series of high-performance **Oven Controlled Crystal Oscillators (OCXO)**. These components are critical in electronics for providing an extremely stable and precise frequency reference, far exceeding the capabilities of standard quartz crystals. --- ### 1. Key Technical Specifications Based on the standard nomenclature for the MHO series (typically manufactured by companies like MtronPTI), here is a breakdown of the typical specifications for this part: | Feature | Specification (Typical) | | :--- | :--- | | **Component Type** | OCXO (Oven Controlled Crystal Oscillator) | | **Output Type** | CMOS / TTL Compatible | | **Supply Voltage** | 3.3V or 5.0V DC (Varies by sub-model) | | **Frequency Stability** | ±0.1 ppm to ±0.01 ppm (Temperature dependent) | | **Package Style** | Through-Hole (DIP-14 equivalent footprint) | | **Operating Temp** | -40°C to +85°C (Industrial Grade) | | **RoHS Status** | Compliant (Indicated by the '-R' suffix) | --- ### 2. Functional Principles The MHO+71FFD-R operates on the principle of thermal stabilization: * **The "Oven":** Inside the metal housing, there is a heating element and a thermistor. It keeps the quartz crystal at a constant "turnover" temperature (usually around 75°C to 85°C). * **Thermal Isolation:** Because the crystal stays at a constant temperature regardless of the external environment, the frequency drift is minimized to parts-per-billion (ppb) levels. * **Internal Circuitry:** Includes a buffer amplifier to ensure the output signal is clean and can drive subsequent logic gates without degradation. --- ### 3. Pinout Configuration While you should always consult the specific datasheet, standard MHO series 14-pin DIP packages usually follow this layout: | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | V_control / N.C. | Voltage control for frequency tuning (or No Connect) | | **7** | GND | Case and Circuit Ground | | **8** | Output | RF Output (Square Wave) | | **14** | Vcc | Positive Supply Voltage | --- ### 4. Common Applications Due to its high stability, this part is found in: 1. **Telecommunications:** Base stations (LTE/5G) and small cells. 2. **Test & Measurement:** Frequency counters and signal generators. 3. **Network Timing:** Synchronous Ethernet (SyncE) and IEEE 1588 PTP clocks. 4. **Satellite Comms:** Up/Down converters and ground station equipment. --- ### 5. Part Number Breakdown * **MHO:** Series designation (High-stability OCXO). * **71:** Package/Physical size code. * **FFD:** Frequency stability and temperature range code. * **-R:** RoHS (Lead-free) compliance.