QT161S-25.000MDDV-T

Overview

The QT161S-25.000MDDV-T is a surface-mount quartz crystal resonator manufactured by QST, operating at a fundamental frequency of 25 MHz. It features a frequency stability and tolerance of ±20 ppm within an operating temperature range of -20°C to +70°C. The component utilizes a load capacitance of 8 pF and exhibits an equivalent series resistance (ESR) of 100 Ohms. It is housed in a compact 4-SMD, No Lead package with dimensions of 1.60mm x 1.20mm x 0.40mm maximum height. This device is designed for base harmonic operation and complies with RoHS3 standards.

Feature Summary

• Compact 4-SMD no-lead surface mount package suitable for automated assembly
• High frequency stability of ±20 ppm across the specified industrial temperature range
• Low equivalent series resistance of 100 Ohms for efficient circuit integration
• Compliant with RoHS3 environmental regulations

Applications

• Clock signal generation for microcontrollers and digital logic circuits
• Frequency reference sources for communication modules
• Timing components in consumer electronics devices
• Oscillator circuits requiring stable 25 MHz input frequencies

Procurement Notes

Verify the specific suffix 'D' confirms the ±20 ppm stability rating and -20°C to +70°C temperature range as defined in the official QST QT161S series documentation. Ensure the ordering part number matches the exact electrical parameters required for the target application, particularly the 8 pF load capacitance and 100 Ohm ESR specifications. Cross-reference the datasheet to confirm compliance with RoHS3 requirements if necessary for regulatory adherence.

Selection Notes

Select this component when a 25 MHz fundamental mode crystal is required with ±20 ppm stability in an industrial temperature environment. The 4-SMD no-lead footprint offers space efficiency compared to larger packages. Consider the 8 pF load capacitance requirement for oscillator circuit design compatibility. Evaluate the 100 Ohm ESR against the driving capability of the host oscillator circuit to ensure reliable startup and operation without overdriving the crystal.

Part Context

The QT161S-25.000MDDV-T belongs to the QT161S series of surface-mount crystals from QST. This series provides various frequency options and stability grades, distinguished by suffix letters indicating temperature ranges and ppm tolerances. The 'D' suffix specifically denotes the ±20 ppm stability and -20°C to +70°C operating range. The series is characterized by its small form factor and suitability for high-volume surface mount technology (SMT) manufacturing processes.

Replacement Considerations

Direct substitutes include other manufacturers' 25 MHz crystals in 1.6x1.2mm SMD packages with ±20 ppm stability and 8 pF load capacitance, such as TXC's 8Q-25.000MEEV-T or Abracon's ABM12W-25.0000MHZ-6-B1U-T3, provided their mechanical and electrical specifications align with the original design constraints.