QT26-32.768KDZF-B

Overview

The QT26-32.768KDZF-B is a through-hole quartz crystal resonator manufactured by QST, designed for precise timing applications. It operates at a nominal frequency of 32.768 kHz with a tolerance of ±20 ppm at 25°C. The component features a cylindrical can package with radial leads, measuring 1.9 mm in diameter and 6 mm in height. It has a load capacitance of 12.5 pF and an equivalent series resistance of approximately 35 kOhms. The unit supports an operating temperature range from -20°C to +70°C and weighs approximately 0.05 grams.

Feature Summary

• Cylindrical metal can construction with radial leads for through-hole mounting
• Precision quartz resonator optimized for real-time clock circuits
• Stable frequency performance within specified temperature ranges

Applications

• Real-time clock (RTC) modules in embedded systems
• Industrial automation control units
• Consumer electronics requiring low-power timekeeping

Procurement Notes

Verify the specific ordering suffix KDZF-B against the manufacturer's current datasheet to confirm load capacitance and tolerance specifications. Ensure compatibility with PCB footprint dimensions of Ø1.9x6mm. Cross-reference the DigiKey part number 4981-QT26-32.768KDZF-B-ND for accurate sourcing channels. Confirm that the ±20 ppm tolerance meets the system requirements before procurement.

Selection Notes

Select this component when a standard 32.768 kHz reference is required for timekeeping functions. The ±20 ppm tolerance is suitable for general-purpose RTCs but may not suffice for high-precision navigation or synchronization systems. Consider the 12.5 pF load capacitance requirement to ensure oscillator circuit stability. The radial lead format dictates specific PCB layout constraints compared to surface-mount alternatives.

Part Context

This crystal belongs to the QT26 series of cylindrical quartz resonators from QST. It is functionally similar to other 32.768 kHz crystals like the QT26-32.768KHZB-B, though differences in load capacitance (12.5 pF vs 6 pF) and tolerance exist. The KDZF-B designation specifically identifies the 12.5 pF variant within the product family.

Replacement Considerations

Direct substitutes include the QT26-32.768KDZB-B, which shares identical physical dimensions and frequency but may differ in electrical parameters. Verify load capacitance and tolerance alignment before substitution. Generic 32.768 kHz cylindrical crystals are compatible if pinout and mechanical dimensions match.