The **MHO+31FAD-R** is a high-performance **Crystal Oscillator (XO)** manufactured by MtronPTI. It is part of the MHO+ series, known for its reliability and precision in timing applications. --- ### 1. Key Technical Specifications Below are the primary electrical and mechanical characteristics of the component: | Parameter | Specification | | :--- | :--- | | **Frequency Range** | Typically 1.000 MHz to 156.250 MHz | | **Output Type** | CMOS / TTL Compatible | | **Supply Voltage (Vcc)** | 3.3 VDC (±10%) | | **Frequency Stability** | ±100 ppm (Standard), options for ±25 or ±50 ppm | | **Operating Temperature** | -40°C to +85°C (Industrial Grade) | | **Package Style** | 14-pin DIP (Full size) or 8-pin DIP (Half size) equivalent | | **RoHS Status** | Compliant (Lead-free) | --- ### 2. Functional Breakdown The MHO+31FAD-R consists of several internal electronic stages that work together to provide a stable clock signal: #### A. Quartz Crystal Unit The "heart" of the component. It uses the piezoelectric effect to vibrate at a specific resonant frequency when an electric field is applied. #### B. Oscillator Circuitry Integrated circuitry (IC) that maintains the oscillation of the crystal. It includes: * **Amplifier:** To sustain the vibration. * **Feedback Loop:** Ensures the frequency remains locked. * **Voltage Regulator:** Protects the internal frequency from fluctuations in the input power. #### C. Output Buffer (CMOS/TTL) The "FAD" designation implies a specific output drive capability. The output buffer ensures the clock signal has sharp rise and fall times, allowing it to drive multiple digital loads (Fan-out) without signal degradation. --- ### 3. Part Number Decoder The part number follows a specific nomenclature used by MtronPTI: * **MHO:** Series prefix (Metal Hermetic Oscillator). * **+:** Denotes RoHS compliance. * **3:** Represents the voltage (3.3V). * **1:** Frequency Stability code (e.g., 1 = ±100ppm). * **F:** Symmetry/Duty Cycle (typically 40/60% or 45/55%). * **A:** Operating Temperature range (A = -40°C to +85°C). * **D:** Package style (e.g., 14-pin DIP through-hole). * **-R:** Restricted/Tape and Reel or specific revision indicator. --- ### 4. Applications Because of its through-hole (DIP) design and robust stability, this part is commonly used in: * **Industrial Controllers:** PLC systems requiring stable timing in harsh temperatures. * **Legacy Computing:** Replacement parts for older motherboards or timing circuits. * **Communication Equipment:** Providing the base clock for data transmission. * **Test & Measurement:** Oscilloscopes and signal generators.