QT325S-27.000MDHE-T

Overview

The QT325S-27.000MDHE-T is a surface-mount quartz crystal resonator manufactured by QST, operating at a nominal frequency of 27 MHz. It features a standard 4-SMD, no-lead package with dimensions of 3.2 x 2.5 x 0.7 mm. The component is specified with a load capacitance (CL) of 18 pF and an equivalent series resistance (ESR) of 50 Ohms maximum. Frequency stability is rated at ±20 ppm over the commercial temperature range of -20°C to +70°C, as indicated by the 'D' suffix in the part numbering system.

Feature Summary

• Compact 4-SMD no-lead package design suitable for automated assembly processes
• High frequency stability of ±20 ppm within the commercial operating temperature range
• Standardized electrical parameters including 18 pF load capacitance and 50 Ohm ESR

Applications

• Microcontroller clock sources requiring stable timing references
• Communication modules utilizing 27 MHz carrier or reference frequencies
• Consumer electronics devices with space-constrained printed circuit board layouts

Procurement Notes

Verify the specific suffix codes against official QST documentation to confirm temperature range and stability ratings. Ensure the ordering part number matches the required load capacitance and frequency tolerance for the target application circuit design.

Selection Notes

Select this component when a 27 MHz reference is required in a small form factor SMD package. Confirm that the ±20 ppm stability meets the system timing requirements and that the 18 pF load capacitance aligns with the oscillator circuit design specifications.

Part Context

This part belongs to the QT325S series of thin-film bulk acoustic resonator (FBAR) or similar advanced quartz crystals from QST. The series offers various frequency and stability options through alphanumeric suffixes, allowing designers to customize performance characteristics while maintaining a consistent physical footprint.

Replacement Considerations

Direct replacements must match the 27 MHz frequency, 18 pF load capacitance, and 4-SMD no-lead package dimensions. Verify that alternative suppliers offer comparable ±20 ppm stability over the -20°C to +70°C range to ensure functional equivalence.