QT252S-40.000MEIV-T

Overview

The QT252S-40.000MEIV-T is a 40 MHz quartz crystal resonator manufactured by QST. It utilizes a 2.5x2.0 mm SMD package with four solder pads. The device operates within a temperature range of -40°C to +85°C. Frequency tolerance is ±10 ppm at 25°C and ±20 ppm across the full operating temperature range. The load capacitance is specified as 8 pF, and the equivalent series resistance (ESR) is typically 60 Ω. This component is designed for surface-mount assembly in high-reliability electronic circuits.

Feature Summary

• Seam seal construction for environmental protection
• Surface-mount design compatible with automated assembly
• Wide industrial temperature range operation
• High frequency stability with low drift

Applications

• Industrial communication equipment clock sources
• Microcontroller system timing references
• Network interface controller synchronization
• Embedded control systems requiring stable oscillation

Procurement Notes

Verify the complete part number including suffixes such as MEIV-T against official QST documentation to ensure correct frequency tolerance and packaging specifications. Confirm that the required load capacitance matches the circuit design parameters. Check for RoHS compliance status if restricted substances are a concern. Ensure storage conditions adhere to moisture sensitivity level requirements prior to reflow soldering.

Selection Notes

Select this component when a compact 2520 footprint is required for space-constrained designs. Choose based on the specific need for ±10 ppm initial accuracy at room temperature. Consider the 8 pF load capacitance requirement for oscillator circuit matching. Evaluate the ESR value against the driving capability of the host oscillator circuit to prevent overdriving or failure to start.

Part Context

This part belongs to the QT252S series of quartz crystals from QST. The series offers various frequencies and tolerances in a standardized small outline package. These components are engineered for general-purpose timing applications where size and reliability are critical factors. The series supports both standard and wide temperature operational ranges.

Replacement Considerations

Direct substitutes include other manufacturers' 40 MHz crystals in 2520 packages with identical electrical parameters. Verify pin compatibility and mechanical dimensions before substitution. Ensure the replacement part meets the same ±10 ppm/±20 ppm tolerance and 8 pF load capacitance requirements.