QT49S-26.000MEEJ-T

Overview

The QT49S-26.000MEEJ-T is a surface-mount crystal oscillator from QST, operating at a nominal frequency of 26 MHz. It features a frequency tolerance of ±10 ppm at 25°C and stability over temperature within the same range. The component utilizes an HC-49/US package with dimensions of 12.7x4.8x3.8 mm. Key electrical parameters include a load capacitance of 18 pF and a series resistance of 30 Ohms. It is supplied in tape and reel packaging for automated assembly.

Feature Summary

• Surface-mount design compatible with automated pick-and-place processes
• High frequency stability with ±10 ppm tolerance at 25°C
• Standard HC-49/US form factor adapted for SMD applications

Applications

• Clock generation for microprocessors and microcontrollers
• Communication interface circuits requiring precise timing
• Consumer electronics with space-constrained PCB layouts

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official datasheet to ensure correct frequency tolerance and stability specifications. Confirm that the HC-49/US SMD package dimensions align with the target PCB footprint. Check for RoHS compliance status if required by project regulations. Ensure storage conditions meet moisture sensitivity level requirements before reflow soldering.

Selection Notes

Select this component when a 26 MHz reference signal is required with tight frequency accuracy. The 18 pF load capacitance must match the oscillator circuit design. Consider the 30 Ohm series resistance for drive level limitations. The SMD format offers advantages in board density compared to through-hole equivalents. Validate thermal performance across the intended operating temperature range.

Part Context

This part belongs to the QT49S series of surface-mount crystals from QST. The series provides various frequency options within the HC-49/US SMD package. Other variants in the series differ primarily in nominal frequency and tolerance grades. The model number indicates the specific 26 MHz frequency and ±10 ppm tolerance grade.

Replacement Considerations

Direct substitutes may include other manufacturers' HC-49/US SMD crystals at 26 MHz with ±10 ppm tolerance and 18 pF load capacitance. Verify equivalent series resistance and drive level specifications. Ensure physical dimensions are identical for mechanical compatibility. Cross-reference with TXC or similar suppliers for pin-compatible alternatives.