QTK325-32.768KDE-T

Overview

The QTK325-32.768KDE-T is a surface-mount crystal oscillator (XO) manufactured by QST, operating at a nominal frequency of 32.768 kHz. It utilizes CMOS output logic and functions with a supply voltage of 1.8 V. The device features a frequency stability of ±50 ppm and supports an operating temperature range from -40°C to +85°C. Maximum supply current is specified as 3 mA. The component is housed in a compact 4-pin CSMD package with dimensions of 3.2 mm x 2.5 mm.

Feature Summary

• CMOS output interface for digital clock signal generation
• Low voltage operation at 1.8 V supply
• Surface mount construction for automated assembly

Applications

• Real-time clock circuits in portable electronics
• Microcontroller system timing references
• Embedded control systems requiring low-frequency precision

Procurement Notes

Verify the manufacturer designation, as some listings associate this part number with TXC Corporation while others cite QST. Confirm the specific suffix requirements for enable/disable functionality and ensure the package dimensions match the target PCB footprint before ordering.

Selection Notes

Select this component when a low-power, low-voltage 32.768 kHz reference is required for timekeeping or slow-speed synchronization. Ensure the design accommodates the 1.8 V supply constraint and verify that the ±50 ppm stability meets the system's timing accuracy requirements across the industrial temperature range.

Part Context

This oscillator belongs to the QTK325 series, which provides standard clock signals in small surface-mount packages. The 32.768 kHz frequency is a binary-derived value commonly used for dividing down to one-second intervals in real-time applications. The CMOS output ensures compatibility with standard digital logic inputs.

Replacement Considerations

Direct substitutes include the QTK325-32.768KBE-T and QTK325-32.768KBA-T from the same family, though these may differ in supply voltage or stability specifications. Verify pinout compatibility and electrical parameters before cross-referencing with other manufacturers' equivalent parts.