STDMUA17-32.768K

Overview

The NDK STDMUA17-32.768K is a surface-mount tuning fork crystal operating at a nominal frequency of 32.768 kHz. It belongs to the NX3215SA series and features a compact 3.2 mm x 1.5 mm SMD package with a maximum height of 0.90 mm. The component supports a load capacitance of 12.5 pF and offers a frequency tolerance of ±20 ppm at 25°C. It operates within a temperature range of -40°C to +85°C and exhibits an equivalent series resistance (ESR) of up to 70 kOhms. The device utilizes a fundamental mode of operation and is designed for low-power applications.

Feature Summary

• Compact thin-profile SMD design suitable for space-constrained PCB layouts
• Low power consumption characteristics optimized for battery-operated devices
• Robust metal lid construction providing enhanced mechanical stability during reflow soldering

Applications

• Real-time clock circuits in portable consumer electronics
• Timekeeping modules in wearable health devices
• Clock sources for automotive telematics and T-BOX systems

Procurement Notes

Verify that the specific ordering suffix matches the required load capacitance, as the NX3215SA series includes variants with different capacitance values such as 6pF, 9pF, and 12.5pF. Confirm whether the project requires the standard industrial grade or the AEC-Q200 qualified automotive grade version, as these differ in temperature range and reliability standards. Ensure compatibility with lead-free reflow soldering profiles specified in the manufacturer datasheet.

Selection Notes

Select this component when a small footprint is critical for RTC implementations in handheld or wearable devices. The 12.5 pF load capacitance must align with the microcontroller's internal or external capacitor configuration to prevent frequency deviation. Consider the ESR limits relative to the MCU's drive strength to ensure reliable startup under low-voltage conditions. Evaluate the thermal requirements against the -40°C to +85°C operational range before finalizing the design.

Part Context

This part is a variant within the NX3215SA series of surface-mount crystals manufactured by NDK. The series is widely recognized for its consistency in low-power timing applications across consumer and industrial sectors. The STDMUA17 designation specifically indicates the 12.5 pF load capacitance configuration within the standard temperature range product line.

Replacement Considerations

Direct substitutes include other NX3215SA variants with identical electrical parameters but different load capacitances, provided the circuit design allows for adjustment. Cross-reference with other manufacturers offering 3215 package 32.768 kHz crystals, ensuring ESR and drive level specifications match the original design constraints.