QT216S-40.000MEIQ-T

Overview

The QT216S-40.000MEIQ-T is a surface-mount quartz crystal resonator manufactured by QST, designed for precision timing applications. It operates at a fundamental frequency of 40 MHz with a standard load capacitance of 10 pF and an equivalent series resistance (ESR) of 50 Ohms. The device exhibits a frequency tolerance of ±10 ppm at 25°C and maintains stability within ±20 ppm across the industrial temperature range of -40°C to +85°C. Housed in a compact 4-SMD, No Lead package measuring 2.0 x 1.6 mm, it utilizes seam seal technology to ensure environmental durability and long-term reliability in electronic circuits.

Feature Summary

• Seam seal construction for enhanced environmental protection
• Compact 2.0x1.6mm SMD footprint for space-constrained designs
• Industrial temperature range operation from -40°C to +85°C
• High frequency stability with ±10ppm initial tolerance

Applications

• Microcontroller clock sources
• Communication module timing references
• Consumer electronics internal clocks
• Industrial control system oscillators

Procurement Notes

Verify the complete part number including suffixes such as MEIQ-T against official QST documentation to ensure correct frequency, tolerance, and packaging specifications. Confirm that the supplier provides genuine components with traceable manufacturing data. Request datasheets specific to the 40 MHz variant to validate electrical parameters like ESR and load capacitance prior to integration into final products.

Selection Notes

Select this component when a 40 MHz reference signal is required in a minimal footprint design. Ensure the application circuit supports a 10 pF load capacitance to maintain specified accuracy. Consider the ±10 ppm tolerance sufficient for most digital logic interfaces. Verify thermal management requirements align with the -40°C to +85°C operational range for industrial or consumer environments.

Part Context

This model belongs to the QT216S series of surface-mount crystals from QST, characterized by small dimensions and high reliability. Similar variants in the family include different frequencies such as 32 MHz or 39 MHz, and alternative packages like larger SMD sizes. The 40 MHz version specifically targets applications requiring precise synchronization without the need for active oscillator modules.

Replacement Considerations

Direct substitutes must match the 40 MHz frequency, 10 pF load capacitance, 50 Ohm ESR, and 2.0x1.6mm package dimensions. Cross-reference with other manufacturers' 40 MHz seam-seal crystals ensuring identical pinout and mechanical tolerances. Verify that alternative parts meet the same ±10 ppm tolerance and industrial temperature rating.