MU00658-32.768K

Overview

The NDK MU00658-32.768K is a surface-mount tuning fork crystal resonator operating at a nominal frequency of 32.768 kHz. It features a load capacitance of 6 pF and an equivalent series resistance (ESR) of 90 kOhms. The component utilizes a 2-SMD, no-lead package with dimensions of 3.20 mm in length and 1.50 mm in width, and a maximum height of 0.90 mm. Designed for fundamental mode operation, it provides stable timing signals suitable for low-power applications requiring precise clock references.

Feature Summary

• Compact 3.2x1.5 mm surface-mount footprint optimized for space-constrained designs
• High impedance characteristic with 90 kOhm ESR suitable for low power consumption
• Tuning fork configuration ensuring stable oscillation at standard timekeeping frequencies

Applications

• Real-time clock circuits in portable electronic devices
• Battery-powered consumer electronics requiring low standby current
• Wearable technology and smart home IoT modules

Procurement Notes

Verify the specific load capacitance requirement of 6 pF against the target oscillator circuit design to ensure frequency accuracy. Confirm that the 90 kOhm ESR value aligns with the driving capability of the host microcontroller or RTC chip. Ensure PCB layout accommodates the 2-SMD no-lead package dimensions of 3.20 x 1.50 mm with appropriate solder mask definitions for reliable reflow assembly.

Selection Notes

Select this component when a small form factor is critical for the application board space. The 6 pF load capacitance requires careful matching with external capacitors to maintain the specified 32.768 kHz frequency tolerance. Consider the high ESR value as a factor for oscillator circuit stability, particularly in low-drive environments typical of battery-operated systems.

Part Context

This part belongs to NDK's portfolio of SMD tuning fork crystals, which are specialized for timekeeping applications. Unlike general-purpose MHz crystals, these components are engineered specifically for the 32.768 kHz frequency band, leveraging NDK's artificial quartz cultivation technology to achieve long-term frequency stability and reliability in various environmental conditions.

Replacement Considerations

Direct substitutes must match the 32.768 kHz frequency, 6 pF load capacitance, and 2-SMD 3.2x1.5 mm package. Verify ESR compatibility, as values like 70 kOhm or 80 kOhm may require oscillator circuit adjustments. Ensure the replacement maintains the same fundamental mode operation and temperature characteristics.