ECS HC-49UX Quartz Crystals provide excellent first-year aging of ±5ppm and operate over a 1.8MHz to 100MHz frequency range. ECS HC-49UX Quartz Crystals are cost-effective AT cut crystal devices that operate over a -10°C to +70°C temperature range. The series is moisture sensitivity level (MSL) 1 rated and lead-free/RoHS compliant.