ABC2 Low-Frequency SMT Microprocessor Crystal The ABRACON ABC2 Series Low-Frequency SMT Microprocessor Crystal feature low frequency in a small SMD size with a 2.0mm height - ideal for high-density circuit boards. The ceramic package of the ABC2 offers excellent environmental resistance and heat resistance (-40ºC to +85ºC). The ABRACON ABC2 Series Low-Frequency SMT Microprocessor Crystal is used in a wide range of communication and measuring equipment, commercial and industrial applications, and automotive electronics.