QT252S-18.432MAHE-T

Overview

The QT252S-18.432MAHE-T is a surface-mount crystal oscillator manufactured by QST, operating at a nominal frequency of 18.432 MHz. It features a 4-SMD, No Lead package with dimensions of 2.5mm x 2.0mm x 0.55mm. The component exhibits a frequency stability and resonator tolerance of ±30ppm at 25°C, extending to ±30ppm across the -40°C to +85°C operating temperature range. It utilizes a load capacitance of 12pF and is RoHS compliant without SVHC substances.

Feature Summary

• Surface mount design for automated assembly
• Wide industrial temperature operation capability
• Compact footprint suitable for space-constrained layouts

Applications

• Microcontroller clock sources
• Communication module timing references
• Digital signal processing circuits

Procurement Notes

Verify the specific suffix 'MAHE' against the manufacturer's current datasheet to confirm pinout and electrical characteristics match the target design. Ensure the load capacitance requirement of the host circuit aligns with the specified 12pF value to maintain accurate frequency performance. Confirm that the 4-SMD no-lead package type is compatible with the PCB soldering profile and reflow conditions used in production.

Selection Notes

Select this component when a precise 18.432 MHz reference is required within a compact SMD form factor. The ±30ppm stability specification is suitable for general digital applications but may require tighter tolerances for high-precision communication standards. Consider the 12pF load capacitance requirement during schematic design to ensure proper oscillation startup and frequency accuracy without external trimming components.

Part Context

This part belongs to the QT252S series of quartz crystals from QST, designed for surface-mount technology. The series offers various frequencies while maintaining consistent physical dimensions and electrical parameters. The 18.432 MHz variant is commonly used in systems requiring binary-divisible clock rates for UART or SPI interfaces.

Replacement Considerations

Direct substitutes include other manufacturers' 18.432 MHz crystals in 2.5x2.0mm packages with 12pF load capacitance and ±30ppm stability, such as TXC equivalents. Verify mechanical compatibility and electrical specifications before substitution.