The **MCSO2EL** (Micro-Crystal Small Oscillator 2 EL) is a specialized series of high-performance, radiation-hardened crystal oscillators designed primarily for extreme environments, such as space exploration, aerospace, and medical implants. --- ## 1. Core Technical Specifications The MCSO2EL series is manufactured by **Micro Crystal**, a leading Swiss company specializing in quartz crystals and oscillators. Below are the typical technical parameters: | Feature | Specification | | :--- | :--- | | **Frequency Range** | 10 kHz to 225 MHz | | **Supply Voltage** | 1.8V, 2.5V, 3.3V, or 5.0V | | **Package Size** | 5.0 x 3.2 x 1.2 mm (Ceramic LCC) | | **Output Type** | CMOS / TTL compatible | | **Operating Temperature** | -55°C to +125°C (Standard extreme) | | **Radiation Tolerance** | Up to 100 kRad (TID) | --- ## 2. Key Electronic Components & Construction The "EL" in the part number often signifies **Extreme Low Power** or specific **Enhanced Reliability** features. The internal architecture consists of: ### A. High-Q Quartz Crystal The heart of the component is a high-precision quartz blank. In the MCSO2EL, this is processed using photolithographic techniques to ensure a high **Quality Factor (Q)**, which results in superior frequency stability over time and temperature. ### B. Integrated Circuit (ASIC) The internal ASIC includes: * **Oscillator Circuit:** Sustains the mechanical vibration of the crystal. * **Frequency Dividers:** Allows for low-frequency outputs from higher-frequency crystals. * **Output Buffer:** Ensures the signal integrity (square wave) remains stable despite load changes. ### C. Hermetic Package The components are housed in a **ceramic package with a Kovar lid**, sealed via gold-tin (AuSn) preform. This vacuum-sealed environment prevents moisture and gas from affecting the crystal's vibration frequency (aging). --- ## 3. Specialized Features 1. **Radiation Hardening:** Unlike consumer oscillators, the MCSO2EL uses materials and circuit designs resistant to Single Event Effects (SEE) and Total Ionizing Dose (TID), making it "Space Grade." 2. **Low Current Consumption:** Optimized for battery-powered remote sensors or satellite subsystems. 3. **Shock/Vibration Resistance:** Designed to survive the high G-forces of a rocket launch or mechanical impacts. --- ## 4. Part Number Breakdown Example While codes vary, a typical part number like `MCSO2EL-V-3.3-20.000MHz` represents: * **MCSO2EL:** Series name. * **V:** Operating temperature range (e.g., -55 to +125°C). * **3.3:** Input voltage (3.3 Volts). * **20.000MHz:** The fundamental output frequency.