The **MHO+31TBD-R** is a high-precision, high-frequency **TCXO (Temperature Compensated Crystal Oscillator)** manufactured by MtronPTI. These components are essential in applications requiring extreme frequency stability over a wide temperature range. --- ### 1. Key Technical Specifications Below are the primary electronic characteristics typical of the MHO+ series (specifically the 31TBD-R variant): | Feature | Specification | | :--- | :--- | | **Output Type** | HCMOS / TTL Compatible | | **Input Voltage ($V_{dd}$)** | 3.3V DC (Typical) | | **Frequency Range** | Usually between 1.0 MHz and 160.0 MHz | | **Frequency Stability** | ±1.0 ppm to ±5.0 ppm (vs Temperature) | | **Operating Temp Range** | -40°C to +85°C (Industrial Grade) | | **Package Style** | 14-pin DIP (Thru-hole), Metal Can | | **RoHS Status** | Compliant (-R suffix indicates RoHS) | --- ### 2. Functional Electronic Components The "MHO" series integrates several internal electronic stages within its metal shielding: 1. **Quartz Crystal Resonator:** The heart of the device, providing the fundamental mechanical resonance. 2. **Compensation Circuitry:** Contains a temperature sensor and a compensation network that adjusts the load capacitance of the crystal to counteract frequency "drift" caused by heat or cold. 3. **Buffer Amplifier:** An internal IC that strengthens the signal to ensure it can drive HCMOS/TTL loads without degrading the waveform. 4. **Voltage Regulator:** Often included internally to minimize frequency fluctuations caused by small changes in the input supply voltage. --- ### 3. Pin Configuration (14-Pin DIP Style) While the physical unit has 14 pins, most are "dummy" pins for mechanical stability. The active electronic pins are usually: * **Pin 1:** NC (No Connection) or Tri-state Control. * **Pin 7:** Case Ground (VSS). * **Pin 8:** Output (The clock signal). * **Pin 14:** Supply Voltage (VDD). --- ### 4. Typical Applications Because of its high stability and metal casing (which provides EMI shielding), this part is commonly used in: * **Telecommunications:** Base stations and switching equipment. * **Test & Measurement:** Oscilloscopes and frequency counters. * **Aerospace/Defense:** Navigation systems where timing precision is critical. * **Data Communications:** High-speed Ethernet synchronization. ---