The **MHO+45TCD-R** is a high-performance **Crystal Oscillator (XO)** manufactured by MtronPTI. It belongs to the MHO+ series, which is characterized by its 14-pin DIP (Dual In-line Package) compatible metal header and high-frequency stability. --- ### 1. Key Technical Specifications The part number follows a specific nomenclature that defines its electrical characteristics: | Parameter | Specification | | :--- | :--- | | **Output Type** | CMOS / TTL Compatible | | **Package Style** | 14-pin DIP (Full Size) | | **Operating Voltage** | Typically 5.0V (Standard for MHO+ series) | | **Frequency Stability** | ±50 ppm (denoted by '45') | | **Temperature Range** | -40°C to +85°C (Industrial Grade, denoted by 'T') | | **Symmetry/Duty Cycle** | 40/60% to 45/55% (denoted by 'C') | | **Tristate Function** | Yes (denoted by 'D') | | **RoHS Compliant** | Yes (denoted by '-R') | --- ### 2. Functional Characteristics #### A. The "D" Suffix (Tristate / Output Enable) The "D" in the part number indicates a **Tristate** or **Output Enable (OE)** function. - When the OE pin is High (or floating), the oscillator outputs the frequency. - When the OE pin is Low, the output goes into a high-impedance state, allowing for power saving and easier circuit testing. #### B. The "T" Suffix (Industrial Temperature) Standard commercial oscillators operate from 0°C to +70°C. The "T" signifies an extended range of **-40°C to +85°C**, making it suitable for outdoor equipment, automotive interfaces, and industrial automation. #### C. Metal Package Shielding The part is housed in a hermetically sealed metal "can." This provides excellent **EMI (Electromagnetic Interference) shielding**, protecting the internal quartz crystal from external noise and reducing the emissions the oscillator sends to nearby components. --- ### 3. Common Pin Configuration (14-Pin DIP Layout) Although it is a "14-pin" size, most models only utilize 4 pins physically: | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | N/C or Tri-state | Control pin to enable/disable output | | **7** | GND | Case Ground | | **8** | Output | Frequency Signal (Square Wave) | | **14** | Vcc | Positive Power Supply (+5V) | --- ### 4. Typical Applications * **Networking:** Routers, switches, and modems requiring stable clocking. * **Industrial Control:** PLCs (Programmable Logic Controllers) operating in harsh temperatures. * **Legacy Hardware:** Maintenance of older telecommunication systems that use through-hole PCB mounting. * **Data Acquisition:** High-speed measurement systems requiring low-jitter clock sources.