The **MH42TCD-R** refers to a high-precision, temperature-compensated crystal oscillator (TCXO) typically used in telecommunications, networking, and precision timing applications. It is part of a series designed to provide high stability across a wide temperature range. --- ### 1. Key Technical Specifications Below are the general parameters associated with this component type: | Parameter | Specification (Typical) | | :--- | :--- | | **Component Type** | Temperature Compensated Crystal Oscillator (TCXO) | | **Frequency Range** | Typically 10MHz to 52MHz (Model specific) | | **Output Type** | Clipped Sine Wave or CMOS | | **Stability** | ±0.5 ppm to ±2.5 ppm | | **Supply Voltage** | 1.8V to 3.3V DC | | **Operating Temperature** | -40°C to +85°C | | **Package Size** | Compact SMD (e.g., 2.0 x 1.6 mm or 2.5 x 2.0 mm) | --- ### 2. Breakdown of Electronic Features #### A. Temperature Compensation Unlike standard crystals, the "TC" in the part number indicates it contains an internal compensation circuit. This circuit senses the ambient temperature and adjusts the crystal's frequency to counteract the natural drift caused by heat or cold, ensuring a highly stable clock signal. #### B. Low Phase Noise The MH42 series is engineered for low phase noise. This is critical for wireless communication (RF), as high phase noise can lead to jitter and increased bit error rates in data transmission. #### C. Power Efficiency These parts are usually designed for battery-operated devices. They feature low current consumption (often under 2.0mA) and sometimes include a "Standby" or "Enable/Disable" pin to save power when the clock signal is not required. --- ### 3. Common Applications * **GPS/GNSS Modules:** High precision is required to calculate accurate position data from satellites. * **Smartphone & Tablets:** Used as a reference clock for Wi-Fi and Bluetooth modules. * **IoT Devices:** Provides stable timing for LPWAN (Low Power Wide Area Network) communication. * **Wearables:** Its small form factor makes it ideal for smartwatches and fitness trackers. --- ### 4. Part Number Breakdown (Typical Naming Convention) * **MH:** Series prefix (Often associated with specific manufacturers like Micro Crystal or similar). * **42:** Refers to the physical package size or series generation. * **TCD:** Indicates **T**emperature **C**ompensated **D**evice. * **-R:** Usually denotes **RoHS** compliance or **Tape & Reel** packaging for automated assembly.