Pletronics Inc. OHA4 SMD OCXO Oscillators are ovenized quartz crystal high-precision square wave generator oscillators with CMOS output. Pletronics OHA4 SMD OCXO Oscillators feature a 3.3V nominal supply voltage, 10.0MHz typical frequency, and ±20ppb frequency stability vs. temperature. Applications for these 7.5mm x 5.5mm oscillators include Synchronous Optical Networking/Synchronous Digital Hierarchy/Dense wavelength-division multiplexing (SONET/SDH/DWDM), test and measurement, telecom transmission and switching equipment, and more.