STDMUA18-32.768K

Overview

The NDK STDMUA18-32.768K is a surface-mount quartz crystal resonator operating at a nominal frequency of 32.768 kHz. It features a load capacitance of 9 pF and an equivalent series resistance (ESR) of 20 kOhms. The component utilizes a 2-SMD, no-lead package with dimensions of 3.20 mm in length and 1.50 mm in width. It supports base harmonic operation and is designed for applications requiring precise timing signals.

Feature Summary

• Utilizes a compact 2-SMD no-lead package design suitable for space-constrained surface mount applications.
• Provides stable oscillation at the standard 32.768 kHz frequency with a low ESR of 20 kOhms.
• Operates as a fundamental mode resonator optimized for real-time clock circuits.

Applications

• Real-time clock (RTC) modules in portable electronics
• Low-power microcontroller timing sources
• Consumer audio and video equipment

Procurement Notes

Verify the specific package variant against the datasheet to ensure compatibility with PCB footprint requirements. Confirm that the 20 kOhm ESR aligns with the target MCU's drive level specifications to prevent over-driving or failure to start. Ensure RoHS compliance documentation is available for regulatory adherence in the final product assembly.

Selection Notes

Select this component when a small form factor is required alongside a low ESR value to facilitate easy starting in low-drive environments. Compare the 9 pF load capacitance against the system's total stray capacitance to ensure frequency accuracy. Consider the no-lead package for improved thermal performance during soldering processes compared to traditional leaded alternatives.

Part Context

This part belongs to the NX3215SA series family from NDK, which specializes in thin-type surface-mount crystals. The STDMUA18 designation indicates a specific package configuration within this series, distinct from other variants like the STD-MUA-8 which may have different load capacitances or pin configurations despite sharing similar electrical characteristics.

Replacement Considerations

Cross-reference with NX3215SA-32.768K-STD-MUA-9 if a 9 pF load capacitance is required. Verify dimensional compatibility with existing footprints before substituting with other 3215-sized crystals from different manufacturers.