GRM155B31A105KE15D

The GRM155B31A105KE15D is a multilayer ceramic capacitor (MLCC) manufactured by Murata, one of the world's leading producers of passive electronic components. This capacitor belongs to Murata's GRM series, which represents a broad family of general-purpose ceramic capacitors widely used across consumer electronics, industrial equipment, and telecommunications applications. Multilayer ceramic capacitors are among the most commonly specified passive components in modern electronics due to their small size, reliability, and cost-effectiveness. The GRM155 series specifically uses a 0402 metric package size (1.0mm × 0.5mm), making it ideal for space-constrained applications where board real estate is at a premium. This compact form factor has become standard in contemporary PCB design, allowing engineers to achieve higher component density without sacrificing performance or reliability. The "31" designation in this part number indicates the capacitor uses Murata's X7R dielectric material. X7R is a temperature-stable ceramic formulation that maintains relatively stable capacitance across a wide temperature operating range, making it suitable for applications requiring consistent performance in varying environmental conditions. This dielectric type is preferred over Y5V alternatives in many industrial and precision applications where predictable electrical characteristics are essential. Typical applications for this capacitor include decoupling and filtering in power supply circuits, signal coupling and bypassing in audio and RF circuits, and energy storage in timing circuits. Engineers commonly specify this part in microcontroller and digital signal processor designs, where decoupling capacitors are needed at power pins to suppress high-frequency noise and maintain stable voltage rails. It is also frequently found in automotive electronics, industrial control systems, and portable instrumentation where reliability and temperature stability are critical requirements. The choice of Murata components is driven by several factors: the manufacturer's reputation for consistent quality across large production volumes, extensive validation in mission-critical applications, and availability through established distribution channels. The GRM155B31A105KE15D's part number structure allows engineers to identify its key characteristics at a glance, facilitating design decisions and simplifying component substitution processes when necessary. For applications requiring this specific package size and dielectric type, the GRM155B31A105KE15D provides a proven, widely-used solution. Its prevalence in production environments means that supply chain stability and design support resources are readily available, reducing integration risk for manufacturers.