QT2M-32.768KDZB-T

Overview

The QT2M-32.768KDZB-T is a surface-mount kHz crystal manufactured by QST, designed for precision timing applications. It operates at a fundamental frequency of 32.768 kHz with a tight tolerance of ±5ppm. The component features a load capacitance of 6pF and an equivalent series resistance of 50 kOhms. It is housed in a compact 4-SOJ package with a 5.50mm pitch, measuring 8.00mm x 3.80mm. The unit supports a maximum standing height of 2.50mm and functions reliably within an operating temperature range of -40°C to +85°C.

Feature Summary

• Precision tuning fork crystal design for stable timekeeping
• High frequency stability with ±5ppm tolerance
• Compact surface-mount SOJ packaging for automated assembly

Applications

• Real-time clock circuits in consumer electronics
• Microcontroller system oscillators
• Wearable device timing modules

Procurement Notes

Verify the specific suffix 'KDZB' against official QST documentation to confirm package dimensions and pin configuration. Ensure compatibility with existing PCB footprints, as SOJ variants may differ from standard SMD crystals. Cross-reference the 50 kOhm ESR requirement with circuit design specifications to guarantee proper oscillator startup conditions.

Selection Notes

Select this component when high accuracy is required over wide temperature ranges. The ±5ppm tolerance exceeds standard ±20ppm options, making it suitable for battery-powered devices where long-term drift must be minimized. The 4-SOJ form factor offers a balance between size and mechanical robustness compared to smaller 2-pin alternatives.

Part Context

This part belongs to QST's QT2M series of tuning fork crystals. Unlike lower-tolerance models such as the QT2C series which offer ±20ppm, the QT2M variant provides superior stability. The KDZB suffix indicates specific manufacturing attributes related to the surface-mount lead frame structure and termination style.

Replacement Considerations

Direct substitutes include other manufacturers' 32.768kHz SOJ crystals with matching 6pF load capacitance and ≤50kΩ ESR. Verify that replacement parts maintain the same 8.00mm x 3.80mm footprint and 2.50mm max height to ensure mechanical fit.