IQD has extended the performance of their IQOV-90 series high stability low phase noise OCXOs to encompass the full standard industrial temperature range of -40 to 85°C. High operating temperature ranges are significantly more technically challenging in OCXOs than for other frequency products. By increasing the internal crystals turnover point to a safe margin above 85°C and reducing the thermal loss of the circuit, our design team have been able to increase the maximum external temperature range of the part to 85°C.