FC/FK Automotive-Grade Crystals & Oscillators Fox / Abracon FC and FK Automotive-Grade Crystals and Oscillators are manufactured at TS16949-certified facilities and meet AEC-Q200 requirements. These products feature a wide frequency range and HCMOS, LVPECL, LVDS, or HCSL options. Fox / Abracon FC and FK Automotive-Grade Crystals and Oscillators are available in a broad selection of package sizes.