QT325G-8.000MDHV-T

Overview

The QT325G-8.000MDHV-T is a quartz crystal resonator manufactured by QST, designed for surface-mount applications. It operates at a fundamental frequency of 8 MHz with a load capacitance of 18 pF. The component features a glass-sealed MHZ package in a 4-SMD, No Lead configuration with dimensions of 3.2 x 2.5 x 0.8 mm. Frequency stability is specified at ±20 ppm over the temperature range of -20°C to +70°C. The equivalent series resistance (ESR) is typically 100 Ohms.

Feature Summary

• Glass-sealed MHZ construction for enhanced environmental durability and long-term stability
• Fundamental operating mode ensuring precise frequency control
• Compact 4-SMD no-lead footprint suitable for automated surface-mount assembly

Applications

• Microcontroller clock sources
• Communication module timing references
• Consumer electronics oscillator circuits

Procurement Notes

Verify the specific suffix MDHV against the manufacturer's official datasheet to confirm the exact tolerance and temperature range specifications. Ensure the ordering part number matches the required load capacitance and ESR values for the target circuit design. Cross-reference the package dimensions with the PCB footprint library to guarantee mechanical compatibility during assembly.

Selection Notes

Select this component when a compact, glass-sealed crystal is required for 8 MHz applications. The ±20 ppm stability suits general-purpose timing needs within the -20°C to +70°C range. Consider the 18 pF load capacitance requirement for oscillator circuit tuning. Evaluate the 100 Ohm ESR against the oscillator driver strength to prevent overdriving or startup failures.

Part Context

This part belongs to the QT325G series of quartz crystals from QST. The series utilizes a glass-seal technology that provides superior moisture resistance compared to standard epoxy-sealed packages. The 325G form factor represents a small outline dimension optimized for space-constrained portable devices and high-density circuit boards.

Replacement Considerations

Direct substitutes must match the 8 MHz frequency, 18 pF load capacitance, and 3.2x2.5mm SMD package. Verify that alternative components offer comparable ±20 ppm stability and similar ESR characteristics to ensure circuit compatibility.