The **SQXO2-SM** is a high-reliability, surface-mount crystal oscillator manufactured by **Statek Corporation**. It is specifically designed for harsh environments, military applications, and aerospace technology due to its exceptional stability and miniature size. --- ### 1. Key Technical Specifications The SQXO2-SM is a quartz crystal oscillator that integrates a CMOS-compatible integrated circuit within a ceramic package. | Parameter | Specification | | :--- | :--- | | **Frequency Range** | 2 MHz to 200 MHz | | **Supply Voltage** | 1.8 V to 5.0 V (standard options) | | **Output Type** | CMOS / TTL compatible | | **Package Size** | 3.2 mm x 2.5 mm | | **Operating Temperature** | -55°C to +125°C (Military Grade) | | **Shock Resistance** | Up to 5,000g or higher (specialized versions) | | **Vibration Resistance** | 20g, 10 Hz to 2,000 Hz | --- ### 2. Physical Construction and Pins The device is housed in a hermetically sealed, 4-pad ceramic package. The construction ensures that the quartz crystal remains uncontaminated by moisture or debris. #### Pin Configuration 1. **Pin 1: Enable/Disable (E/D) or No Connection** – Used to turn the output on or off to save power. 2. **Pin 2: Ground (GND)** – Connected to the system ground. 3. **Pin 3: Output** – The high-frequency clock signal. 4. **Pin 4: Supply Voltage (Vdd)** – Power input for the internal circuitry. --- ### 3. Core Features & Advantages * **Low Power Consumption:** Optimized for battery-operated handheld devices. * **High Stability:** Offers excellent frequency stability over a wide temperature range compared to standard consumer-grade oscillators. * **Fast Start-up:** Typically starts oscillating within milliseconds of power application. * **Radiation Hardened:** Certain versions of this series are available with radiation tolerances for space applications. --- ### 4. Common Applications Due to its ruggedized nature, the SQXO2-SM is rarely found in consumer electronics but is a standard in the following sectors: * **Military:** Radio communications, navigation systems, and telemetry. * **Aerospace:** Satellite clocking and cockpit instrumentation. * **Industrial:** Down-hole drilling equipment (high temperature/vibration). * **Medical:** High-reliability diagnostic equipment. ---