MU01259-32.768K

Overview

The MU01259-32.768K is a surface-mount crystal unit manufactured by NDK (NIHON DEMPA KOGYO CO., LTD). It operates at a nominal frequency of 32.768 kHz with a frequency tolerance of ±20 ppm and a load capacitance of 7 pF. The component utilizes a 2-SMD, no-lead package configuration, measuring approximately 2.5 mm in length and 1.2 mm in width. Designed for base mode operation, it features an equivalent series resistance (ESR) typically associated with low-power applications. The device complies with RoHS3 standards and holds an MSL rating of 1, indicating unlimited sensitivity to moisture.

Feature Summary

• Compact 2.5mm x 1.2mm surface-mount footprint suitable for space-constrained designs
• Optimized for low-power consumption in real-time clock circuits
• High frequency stability with ±20 ppm tolerance

Applications

• Real-time clock (RTC) modules in consumer electronics
• Backup timing sources for microcontrollers
• Wearable devices requiring minimal power draw
• IoT sensors with battery-operated constraints

Procurement Notes

Verify the specific suffix or revision code against the manufacturer's latest datasheet to ensure compatibility with current production batches. Confirm that the 7pF load capacitance matches the target oscillator circuit design requirements. Check for RoHS3 compliance documentation if environmental regulations apply to the final assembly. Ensure storage conditions adhere to MSL Level 1 guidelines to maintain component integrity prior to soldering.

Selection Notes

Select this component when a small form factor is critical for the PCB layout. The 32.768 kHz frequency is standard for dividing down to one-second intervals in digital clocks. Consider the ±20 ppm tolerance against the system's overall timing accuracy requirements. Evaluate the 2-pin SMD package against available footprints in the schematic library. Compare ESR specifications with the host MCU's oscillator input capabilities to ensure reliable startup.

Part Context

This part belongs to NDK's line of ultra-small crystal units designed for portable and mobile applications. The NX2012SE series designation often correlates with this physical size category. NDK leverages its expertise in artificial crystal cultivation to provide stable frequency references. These components are widely used in industries prioritizing miniaturization and energy efficiency, such as smartwatches and medical monitors.

Replacement Considerations

STDCRS2-27M is listed as an equivalent part number in distributor databases, though frequency differences exist. Verify pinout and electrical parameters before substitution. No other direct substitutes are confirmed in the provided public data.