The **MHO+21TAD-R** is a high-precision, industrial-grade **Crystal Oscillator (XO)**. It is part of the MHO series, typically manufactured by companies like **MtronPTI**. This component is designed to provide a stable clock signal for digital circuits and communication systems. --- ### 1. General Specifications The part number follows a specific nomenclature that defines its electronic characteristics: | Feature | Specification | | :--- | :--- | | **Component Type** | Quartz Crystal Oscillator (Fixed Frequency) | | **Package Style** | 14-pin DIP (Dual In-line Package) - 4 pins connected | | **Output Type** | TTL / CMOS Compatible | | **Voltage Supply** | Typically 5.0V DC | | **Frequency Stability** | Usually ±100ppm or ±50ppm (depending on suffix) | | **Operating Temperature** | Commercial (0°C to +70°C) or Industrial (-40°C to +85°C) | --- ### 2. Pin Configuration (Typical 14-pin DIP) Though the casing is the size of a 14-pin IC, only four pins are functional: | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | NC / Tri-state | No connection or Output Enable/Disable | | **7** | GND | Ground / Case Ground | | **8** | Output | The generated clock frequency signal | | **14** | Vcc | Positive Power Supply (+5V) | --- ### 3. Key Electronic Characteristics * **A-Series Designation:** The "A" in the part number often signifies a specific frequency stability or symmetry requirement (e.g., 40/60% duty cycle). * **RoHS Compliance:** The **-R** suffix indicates that the part is **RoHS compliant**, meaning it is manufactured without hazardous materials like lead. * **Drive Capability:** These oscillators are designed to drive multiple gates (typically up to 10 TTL loads), making them robust for older or heavy-duty logic boards. --- ### 4. Common Applications Due to its form factor and reliability, the MHO+21TAD-R is found in: 1. **Legacy Computing:** Motherboards and peripheral controllers. 2. **Industrial Controls:** PLC units and timing modules. 3. **Communication Gear:** Modems and network switching equipment. 4. **Test Equipment:** Signal generators and frequency counters. --- ### 5. Circuit Implementation Example When integrating this part into a circuit, a decoupling capacitor is mandatory to ensure signal purity: ```cpp // Schematic Logic Connection [VCC (+5V)] ----+---- [Pin 14 (Vcc)] | [0.1uF Capacitor] | [GND] ----------+---- [Pin 7 (GND)] [Pin 8 (Output)] ----> [Clock Input of MCU/IC] ``` ---