The M21x Series from MtronPTI is a XO with Frequency 10 MHz - 1400 MHz, Supply Voltage 1.8 V, 2.5 V, 3.3 V, Temperature Stability ±20 ppm, ±50 ppm, ±100 ppm, Operating Temperature -40 °C to +85 °C. Tags: Surface Mount. More details for M21x Series can be seen below.