Available at Mouser Electronics: ECS ECX-1637B2 SMD Crystals offer low first-year aging of ±2ppm and come in a compact 2.0mm x 1.6mm x 0.45mm ceramic package. The ECS ECX-1637B2 SMD Crystals are ideal for use in wireless applications and feature a 16MHz to 50MHz frequency range. ECX-1637B2 operates over a -30°C to +85°C temperature range and features ±10ppm frequency tolerance and ±10ppm frequency stability.