The HC-49/U-S4000000ABJB is a 4MHz quartz crystal manufactured by Citizen. This component is crucial for applications requiring precise and stable frequency generation. Housed in a HC-49/U package, this crystal offers reliable performance and is suitable for a wide range of electronic devices. As an authorized distributor of Citizen components, Supreme Components International guarantees the authenticity and quality of this crystal. This 4MHz crystal is commonly used in microcontrollers, communication devices, and other timing-sensitive circuits. Ensure optimal performance in your projects with this high-quality crystal from Citizen. Supreme Components International is your trusted source for genuine electronic components.