The **MHO312FAD-R** is a high-performance, surface-mount (SMD) Crystal Oscillator manufactured by **MtronPTI**. It belongs to the MHO series, which is known for providing reliable clock signals in a compact, rugged package. --- ### 1. Key Technical Specifications Below are the primary electrical characteristics of the MHO312FAD-R: | Feature | Specification | | :--- | :--- | | **Output Type** | HCMOS / TTL | | **Supply Voltage (Vcc)** | +3.3 VDC (Standard) | | **Operating Temperature** | -40°C to +85°C (Industrial Grade) | | **Stability** | ±100 ppm (Standard variation for 'F' code) | | **Package Type** | 5x7 mm Ceramic SMD (4-Pad) | | **Frequency Range** | Typically 1.000 MHz to 125.000 MHz | | **Duty Cycle** | 40/60% (Standard) | --- ### 2. Part Number Breakdown The nomenclature for MtronPTI oscillators provides specific details about the component's capabilities: * **MHO:** Series designation (Metal-on-Ceramic Hybrid Oscillator). * **3:** Voltage code (3.3V). * **1:** Symmetry/Duty Cycle code (typically 40/60%). * **2:** Operating Temperature code (-40°C to +85°C). * **F:** Frequency Stability code (±100 ppm). * **AD:** Pinout/Configuration and Output type (HCMOS/TTL). * **-R:** RoHS Compliant (Lead-free). --- ### 3. Pin Configuration The device typically utilizes a standard 4-pad layout for SMD oscillators: | Pad Number | Function | Description | | :--- | :--- | :--- | | **1** | Tri-state / E/D | High or Open = Output Active; Low = High Impedance | | **2** | Ground | Case and Circuit Ground | | **3** | Output | The generated clock signal | | **4** | Vcc | Supply Voltage (+3.3V) | --- ### 4. Applications The MHO312FAD-R is designed for high-reliability environments where timing precision is critical: * **Networking:** Ethernet switches and routers. * **Industrial:** Embedded controllers and PLC systems. * **Storage:** Fiber Channel and SAN equipment. * **Telecommunications:** Base stations and wireless infrastructure. --- ### 5. Implementation Code (Example) To interface this oscillator with a microcontroller (like an ESP32 or STM32) for an external clock source, you would typically configure the GPIO as an input or use the dedicated OSC_IN pins. ```cpp // Pseudocode for configuring an external clock input void setup_external_clock() { // 1. Ensure Pad 1 of MHO312FAD-R is pulled HIGH or left floating // 2. Route Pad 3 (Output) to the Microcontroller XTAL_IN/OSC_IN pin // Example: Configuring a microcontroller to accept an external bypass clock Clock_Source_Init(EXTERNAL_CMOS_BYPASS); SystemCoreClockUpdate(); } ```