The **MHO+55TFD-R** is a high-performance **Crystal Oscillator (XO)** manufactured by MtronPTI. It belongs to the MHO series, which is known for providing reliable clock signals in a through-hole package format. --- ### 1. General Specifications This component is designed to provide a stable frequency reference for digital circuits. Below are the primary technical characteristics: | Feature | Specification | | :--- | :--- | | **Output Type** | HCMOS / TTL Compatible | | **Package Type** | 14-pin DIP (Full Size) Through-Hole | | **Input Voltage (Vcc)** | +5.0V DC | | **Operating Temperature** | 0°C to +70°C (Standard Commercial) | | **Frequency Stability** | ±100 ppm (Standard for 'blank' grade) | | **Symmetry/Duty Cycle** | 40/60% to 60/40% | --- ### 2. Part Number Breakdown The nomenclature for MtronPTI parts identifies specific features of the component: * **MHO:** Series designation (High-speed CMOS/TTL, 5.0V, 14-pin DIP). * **+:** Indicates Lead-Free / RoHS compliance. * **5:** Represents the Voltage (5.0V). * **5:** (Specific Stability/Temperature code - usually refers to ±50ppm or ±100ppm depending on the specific datasheet revision). * **T:** Tri-state Enable/Disable function (allows the output to be "turned off" to a high-impedance state). * **F:** Full-size DIP package. * **D:** Duty Cycle (usually 40/60%). * **R:** Frequency specific identifier or RoHS compliance suffix. --- ### 3. Pin Configuration (14-Pin DIP) While the physical case is a 14-pin size, only four pins are typically active: | Pin Number | Function | Description | | :--- | :--- | :--- | | **Pin 1** | **NC / Tri-State** | High or Open = Output Active; Low = High Impedance | | **Pin 7** | **Case Ground** | Connected to the metal header for shielding | | **Pin 8** | **Output** | The square wave frequency signal | | **Pin 14** | **Vcc (+5V)** | Power Supply Input | --- ### 4. Key Applications Because of its 5V operation and through-hole design, the MHO+55TFD-R is commonly found in: * **Legacy Computing:** Motherboards and peripheral controllers requiring a 5V clock. * **Industrial Control:** PLCs and automation hardware that prioritize robust through-hole mounting over SMD. * **Networking Gear:** Routers and switches for timing synchronization. * **Test & Measurement:** Oscilloscopes and signal generators. --- ### 5. Technical Precautions 1. **Decoupling:** A 0.01µF to 0.1µF bypass capacitor should be placed as close to Pin 14 (Vcc) and Pin 7 (GND) as possible to minimize noise. 2. **Logic Levels:** Since this is a 5V part, ensuring it interfaces correctly with 3.3V logic is critical (level shifting may be required). 3. **Termination:** To prevent signal reflection on long traces, a series termination resistor near the Output (Pin 8) is recommended.