QT325S-27.000MEIJ-T

Overview

The QT325S-27.000MEIJ-T is a quartz crystal resonator manufactured by QST, operating at a fundamental frequency of 27 MHz. It features a frequency stability of ±10 ppm across the temperature range of -20°C to +70°C. The component utilizes a load capacitance of 18 pF and exhibits an equivalent series resistance (ESR) of 50 Ohms. It is housed in a compact 4-SMD, No Lead package with dimensions of 3.2 x 2.5 x 0.7 mm, designed for surface-mount assembly.

Feature Summary

• Provides precise timing reference with ±10 ppm frequency stability over industrial temperature ranges
• Utilizes low-profile SMD package suitable for space-constrained printed circuit board layouts
• Engineered for stable oscillation characteristics with defined load capacitance requirements

Applications

• Microcontroller clock sources requiring stable 27 MHz input signals
• RF transmitter and receiver circuits utilizing 27 MHz carrier frequencies
• Industrial control systems needing reliable timing references in harsh environments

Procurement Notes

Verify the suffix MEIJ-T confirms the specific ±10 ppm stability rating and -20°C to +70°C temperature range. Ensure the 18 pF load capacitance matches the oscillator circuit design specifications. Confirm the 4-SMD no-lead footprint aligns with the target PCB land pattern to prevent soldering defects during assembly processes.

Selection Notes

Select this component when a 27 MHz fundamental frequency is required with tight tolerance constraints. Consider the ±10 ppm stability requirement against system jitter budgets. Evaluate the 18 pF load capacitance compatibility with the host oscillator's internal capacitors. Assess the thermal performance needs within the -20°C to +70°C operational window for the intended application environment.

Part Context

This part belongs to the QT325S series of thin-mode quartz crystals from QST. The series offers various frequency options and stability grades distinguished by alphanumeric suffixes. The QT325S form factor provides a balance between electrical performance and physical size, commonly used in portable electronics and communication modules where space efficiency is critical.

Replacement Considerations

Direct substitutes must match the 27 MHz frequency, 18 pF load capacitance, and ±10 ppm stability. Verify identical 3.2x2.5mm SMD footprint and pin configuration. Cross-reference datasheets for equivalent ESR values and drive level sensitivity to ensure circuit compatibility without redesign.