ABMxW & ABMx IoT Optimized Quartz Crystals Abracon ABMxW and ABMx IoT Optimized Quartz Crystals are optimized for low power consumption, wearables, and Internet of Things (IoT) applications. These ABMxW and ABMx quartz crystals feature low ESR that ensures operation in power-sensitive solutions and are seam sealed for long-term reliability. The IoT optimized ABMxW and ABMx series quartz crystals are ideally suited for height-constrained designs with 0.4mm, 0.5mm, 0.6mm, and 0.75mm maximum height.