Product: xiaguolingsm HC49S SMD Quartz Crystal Resonators — 10 pieces, 12 MHz Key benefits Stable timing source: Provides a reliable 12 MHz clock reference for digital circuits, reducing timing drift and jitter compared with untuned or software-based clocks. Easy surface-mount integration: HC49S SMD package is compact and designed for PCB assembly, saving board space and simplifying automated placement. Passive, low-noise element: As quartz resonators (passive oscillators), these parts require no internal power and introduce minimal noise to sensitive clock paths. Consistent supply pack: Sold as a pack of 10 pieces — convenient for small production runs, prototypes, or maintenance spares. What this product does and why you need it Function: Provides a fixed-frequency resonant element at 12 MHz (12M, 12,000 kHz) to form stable oscillator circuits with standard microcontroller or discrete oscillator driver topologies. Problem solved: Replaces unreliable or inconsistent clock sources, improves timing accuracy for communications and control tasks, and ensures repeatable performance across devices. Standout features: Brand xiaguolingsm, HC49S SMD form factor, quartz crystal material for long-term stability and temperature tolerance typical of HC49 style resonators. Important attributes Model and quantity: HC49S SMD Quartz Crystal Resonators, pack of 10 pieces, brand xiaguolingsm. Frequency: 12 MHz (12M). Function: Passive resonator for creating stable clock/oscillator signals. Size and mounting: HC49S SMD package suitable for surface-mount PCB layouts and automated assembly. Material/performance: Quartz resonator construction provides low aging and good frequency stability for typical electronic timing needs. Compatibility and use Designed for use with standard oscillator circuits, microcontrollers, clock generators, and timing ICs that accept external resonators in the HC49S footprint. Suitable for surface-mount assembly processes and typical PCB pad layouts for HC49S SMD parts. Practical applications (examples) Microcontroller clock source: Use as the main clock resonator for microcontrollers in consumer electronics, embedded controllers, or development boards requiring a 12 MHz reference. Communication and RF modules: Provide a stable reference for UART, USB, or other serial interfaces and timing-sensitive RF control logic. Timing and control circuits: Ideal for digital timing, frequency synthesis front-ends, and general-purpose oscillator circuits in instrumentation or industrial equipment. What to expect in use Install as part of a resonator/oscillator circuit per your MCU or clock IC datasheet recommendations. Typical benefits include improved timing accuracy, repeatable startup behavior, and reduced need for software clock compensation. Pack of 10 gives spares for tuning, testing, or small-scale production. Order information Product: xiaguolingsm HC49S SMD Quartz Crystal Resonators, 12 MHz, 10 pieces.