The Citizen HC-49/U-S4000000BBIB is a 4MHz quartz crystal, a crucial component for generating stable and accurate frequencies in electronic circuits. Encased in a robust HC-49/U package, this crystal offers excellent stability and reliability across various operating conditions. It's commonly used in microcontrollers, real-time clocks, communication equipment, and other applications demanding precise timing. As an authorized distributor of Citizen components, Supreme Components International guarantees the authenticity and quality of this crystal. Choose the HC-49/U-S4000000BBIB for dependable performance in your frequency control applications. Benefit from our extensive inventory and fast shipping.