QT252S-12.000MDDE-T

Overview

The QT252S-12.000MDDE-T is a surface-mount quartz crystal manufactured by QST, designed for precision timing applications. It operates at a fundamental frequency of 12 MHz with a load capacitance of 12 pF and an equivalent series resistance (ESR) of 150 Ohms. The component features a 4-pin CSMD package with dimensions of 2.5 x 2.0 mm. Frequency tolerance is specified at ±20 ppm at 25°C, while stability ranges from ±20 ppm to ±30 ppm across the operating temperature range of -20°C to +70°C.

Feature Summary

• Seam seal construction utilizing ceramic materials for enhanced environmental protection
• Fundamental mode operation ensuring stable oscillation characteristics
• Compact surface-mount footprint suitable for automated assembly processes

Applications

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

Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging configuration prior to ordering. Confirm that the operating temperature range of -20°C to +70°C aligns with the target application environment requirements. Ensure circuit design accounts for the 12 pF load capacitance specification to maintain frequency accuracy within the stated tolerance limits.

Selection Notes

Select this component when a 12 MHz fundamental frequency is required in a compact SMD form factor. Consider the ±20 ppm tolerance and 150 Ohm ESR specifications against system jitter requirements. Evaluate the -20°C to +70°C temperature range against operational extremes to ensure reliability without requiring industrial-grade variants.

Part Context

This part belongs to the QT252S series of seam seal crystals, characterized by a 2.5x2.0 mm body size. The series offers various frequency options and tolerance grades, with the MDDE-T variant specifically providing standard commercial temperature performance. It serves as a direct replacement for legacy through-hole crystals where space constraints necessitate surface-mount solutions.

Replacement Considerations

Compatible substitutes include the QT252S-12.000MDDQ-T and QT252S-12.000MDIE-T from TXC Corporation, which share similar electrical parameters and package dimensions. Verify pin compatibility and mounting pad layout equivalence before substitution to ensure mechanical fit.