The Citizen HC-49/U-S40000000ABJB is a high-performance 4MHz quartz crystal, meticulously engineered for applications demanding accurate and stable frequency generation. Encased in a robust HC-49/U package, this crystal provides exceptional resistance to environmental factors. Its precise frequency output makes it suitable for use in microcontrollers, real-time clocks, communication equipment, and various other electronic circuits. As an authorized distributor of Citizen components, Supreme Components International guarantees the authenticity and quality of this crystal. Benefit from reliable performance and consistent operation with this Citizen quartz crystal. Supreme Components International offers this and other quality components with fast shipping and excellent customer support. This crystal is RoHS compliant.