The **MHO322TAD-R** is a high-precision, industrial-grade Surface Mount Device (SMD) **Crystal Oscillator**. It is specifically designed for high-stability clock generation in telecommunications, networking, and precision measurement equipment. --- ### 1. General Specifications The device belongs to the **MHO** series, typically manufactured by companies like MtronPTI. These oscillators are known for their high reliability and compact form factor. | Parameter | Specification (Typical) | | :--- | :--- | | **Component Type** | XO (Crystal Oscillator) | | **Package Type** | 4-Pin SMD (Ceramic) | | **Standard Frequency** | Varies by sub-model (Check datasheet for exact MHz) | | **Output Logic** | HCMOS / TTL Compatible | | **Operating Voltage** | Typically 3.3V or 5.0V | | **Temperature Stability** | $\pm$25ppm to $\pm$100ppm | --- ### 2. Breakdown of the Part Number While specific manufacturer codes can vary slightly, the nomenclature generally follows this logic: * **MHO:** Series identifier (Metal/Ceramic Hybrid Oscillator). * **3:** Indicates the physical package size (usually 5x7mm or similar). * **22:** Often refers to the frequency stability or specific voltage requirements. * **TAD:** Technical parameters indicating Temperature range (Industrial -40°C to +85°C) and Output type (HCMOS). * **R:** Indicates **RoHS Compliant** (Lead-free) or Tape and Reel packaging. --- ### 3. Key Electronic Features * **Tristate Function:** Most models include an "Enable/Disable" function on Pin 1. This allows the output to go into a high-impedance state, reducing power consumption when the clock is not needed. * **Low Jitter:** Designed for high-speed data applications where timing precision is critical to avoid data corruption. * **Hermetically Sealed:** The internal crystal is sealed in a ceramic package with a metal lid to protect against atmospheric moisture and oxidation. --- ### 4. Pin Configuration For the standard 4-pin SMD layout used by the MHO322 series: | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | E/D or NC | Enable/Disable (Tristate) or No Connection | | **2** | GND | Circuit Ground | | **3** | Output | Clock Signal Output | | **4** | Vcc | Supply Voltage | --- ### 5. Common Applications 1. **Networking:** Routers, Switches, and Fiber Optic modules. 2. **Computing:** Storage Area Networks (SAN) and high-speed servers. 3. **Industrial:** Embedded controllers and PLC systems requiring wide temperature tolerances.