Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number STFHEB14.318 found under Oscillator Crystal Controlled by At And T Technologies Inc. The National Stock Number assigned to this part is 5955014380862, and the Federal Supply Class is 5955 Oscillators And Piezoelectric Crystals. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like STFHEB14.318.