ECS ECS-500-CDX-2240 50MHz SMD Crystals feature ±15ppm maximum frequency stability and operate over a -40°C to +85°C temperature range. The ECS ECS-500-CDX-2240 SMD Crystals feature a frequency of 50.000MHz and 19pF load capacitance in an ECX-53 package (5.0mm x 3.2mm). These crystals also offer 15Ω maximum effective series resistance (ESR) and a maximum frequency tolerance of ±7ppm.