QT325S-27.000MEEQ-T

Overview

The QT325S-27.000MEEQ-T is a surface-mount quartz crystal manufactured by QST, operating at a nominal frequency of 27 MHz. It features a fundamental oscillation mode with a load capacitance of 10 pF and an equivalent series resistance (ESR) of 50 Ohms. The component exhibits a frequency tolerance and stability of ±10 ppm within the commercial temperature range of -20°C to +70°C. Housed in a compact 4-SMD, no-lead package measuring 3.2mm x 2.5mm with a maximum height of 0.80mm, it supports RoHS 3 compliance.

Feature Summary

• Fundamental mode quartz crystal operation for precise timing applications
• Compact 4-SMD no-lead surface mount package design
• High frequency stability of ±10 ppm across specified temperature ranges

Applications

• Clock signal generation for microcontrollers and processors
• Timing reference for communication interfaces such as UART and SPI
• Frequency control in consumer electronic devices

Procurement Notes

Verify the manufacturer designation on the component marking or datasheet to confirm QST origin, as similar part numbers exist from other vendors like TXC. Ensure the suffix 'E' corresponds to the required ±10 ppm stability over the -20°C to +70°C range. Confirm that the 50 Ohm ESR matches the oscillator circuit requirements. Check for RoHS 3 compliance if environmental regulations apply to the final assembly.

Selection Notes

Select this component when a 27 MHz fundamental frequency is required with tight ±10 ppm stability. The 10 pF load capacitance must match the external capacitors in the oscillator circuit. The 50 Ohm ESR is suitable for standard CMOS oscillator inputs. Consider the 3.2x2.5mm footprint for space-constrained PCB layouts. Verify temperature range compatibility with the operational environment.

Part Context

This part belongs to the QT325S series of surface-mount crystals. It is functionally similar to the TXC QT325S-27.000MEEQ-T, sharing identical electrical parameters and physical dimensions. Both are fundamental mode crystals designed for general-purpose timing applications. The QST version offers equivalent performance characteristics for replacement or dual-sourcing strategies.

Replacement Considerations

The TXC QT325S-27.000MEEQ-T is a direct pin-to-pin and parameter-compatible substitute. Both parts share the same 27 MHz frequency, ±10 ppm stability, 10 pF load capacitance, and 3.2x2.5mm package. Verify that the replacement's ESR and drive level specifications align with the existing circuit design before implementation.