The **MHO+18TBD-R** is a specific part number typically associated with **crystal oscillators** or **clock modules**, often manufactured by companies like MtronPTI. These components are critical for providing a stable frequency reference in digital circuits. --- ### 1. Technical Specifications The part number follows a specific nomenclature that defines its electrical and physical characteristics. | Parameter | Specification (Typical) | | :--- | :--- | | **Component Type** | Crystal Oscillator (XO) | | **Output Type** | HCMOS / TTL Compatible | | **Package Style** | 14-pin DIP (Full size) or 8-pin DIP (Half size) | | **Voltage Supply ($V_{dd}$)** | +5.0V DC (Standard for MHO series) | | **Frequency Range** | Usually ranges from 1.0 MHz to 150.0 MHz | | **Stability** | $\pm$100ppm to $\pm$25ppm (Depending on exact sub-rating) | | **Operating Temp** | 0°C to +70°C (Commercial) | --- ### 2. Part Number Breakdown While manufacturer codes vary slightly, the "MHO" series generally breaks down as follows: 1. **MHO**: Series designation (Metal thru-hole oscillator). 2. **+**: Often indicates RoHS compliance (Lead-free). 3. **18**: Code for the specific frequency stability or operating temperature range. 4. **TBD**: Frequency placeholder. In a final order, this is replaced by the specific frequency (e.g., 20.000MHz). 5. **R**: Denotes "RoHS" compliance or "Tape and Reel" packaging, depending on the manufacturer's suffix system. --- ### 3. Pin Configuration (14-pin DIP Style) Even though it fits a 14-pin socket, only 4 pins are typically used: | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | NC / Tri-state | No connection or Output Enable/Disable | | **7** | GND | Case Ground | | **8** | Output | The generated clock signal | | **14** | $V_{cc}$ | +5.0V Power Supply | --- ### 4. Key Applications * **Microprocessors:** Providing the "heartbeat" for CPUs. * **Networking:** Timing for Ethernet controllers and routers. * **Industrial:** Timing for PLCs and automation controllers that require legacy through-hole components for durability. * **Legacy Hardware:** Maintenance and repair of older computing equipment using 5V logic.