The **MCSO2EU** is a series of high-performance, radiation-tolerant crystal oscillators manufactured by **Microcrystal** (a Swatch Group company). These components are specifically designed for space, aerospace, and high-reliability industrial applications. --- ## 1. Core Technical Specifications The MCSO2EU is an ultra-low profile, surface-mount (SMD) ceramic package oscillator. Below are its primary electronic characteristics: | Parameter | Specification Details | | :--- | :--- | | **Frequency Range** | 10 kHz to 225 MHz | | **Supply Voltage (Vdd)** | 1.8V, 2.5V, 3.3V, or 5.0V | | **Output Type** | CMOS / HCMOS Compatible | | **Package Size** | 5.0 x 3.2 x 1.2 mm (Ceramic LCC) | | **Temperature Range** | -55°C to +125°C (Military Grade) | | **Aging** | Max ±3 ppm in the first year | --- ## 2. Key Electronic Features ### A. Radiation Hardness Unlike standard commercial oscillators, the MCSO2EU is designed to withstand harsh environments: * **TID (Total Ionizing Dose):** Typically rated up to 100 kRad. * **SEL (Single Event Latch-up):** Immune to latch-up due to its specific silicon-on-insulator or hardened design architecture. ### B. Power Consumption The series is optimized for low power draw, which is critical for satellite payloads. At 3.3V and 20 MHz, the current consumption is typically under **5-10 mA**, depending on the load capacitance. ### C. Start-up and Stability * **Fast Start-up:** Typically reaches stable oscillation within 5ms. * **Tight Tolerance:** Offers frequency stability as low as ±20 ppm across the entire temperature range, reducing the need for external compensation circuits. --- ## 3. Physical & Material Construction The "EU" designation often refers to the specific package and termination style: 1. **Ceramic Package:** Provides excellent hermetic sealing to prevent outgassing in vacuum environments. 2. **Gold Plated Pads:** Ensures high-quality solder joints and prevents oxidation. 3. **Kovar Lid:** The lid is usually seam-sealed to the ceramic base to maintain internal vacuum or inert gas atmosphere. --- ## 4. Typical Pin Configuration The MCSO2EU uses a standard 4-pad layout: | Pin # | Function | Description | | :--- | :--- | :--- | | 1 | E/D or NC | Enable/Disable (Tristate) or No Connection | | 2 | GND | Ground / Case | | 3 | Fout | Frequency Output (CMOS) | | 4 | Vdd | Supply Voltage | --- ## 5. Applications * **Space Satellites:** Used in On-Board Computers (OBC) and telemetry modules. * **Defense:** Missiles, high-altitude drones, and secure communication systems. * **Geothermal:** Deep-well drilling equipment where high temperatures and vibrations are present.