A four point mount 5×7 mm high reliability crystal oscillator for extreme environmental applications

High reliability crystal oscillators for extreme operating environments demands unique designs and processes for both the crystal and oscillator components. This paper addresses the development of a hybrid 5×7 mm AT cut crystal and oscillator circuit for extreme environment applications like jet engine controls, oil and gas well-logging including measure while drilling, geothermal systems, space craft and military. The temperature ranges include -65°C to 250°C with reliability tests to 275°C. Currently, these designs cover the frequency range of 312.5 kHz to 85 MHz and -65°C to 200°C for 312.5 KHz to 160 MHz and supply voltages of +1.8Vdc, +2.5Vdc, +3.3Vdc and +5Vdc.