QT325G-28.636360MAHJ-T

Overview

The QT325G-28.636360MAHJ-T is a surface-mount crystal oscillator manufactured by QST, designed for precision timing applications in compact electronic devices. It operates at a fundamental frequency of 28.63636 MHz with a load capacitance of 18 pF and an equivalent series resistance (ESR) of 60 Ohms. The component features a 4-SMD, no-lead package with dimensions of 3.2 x 2.5 mm. Frequency tolerance and stability are rated at ±30 ppm across the operating temperature range of -20°C to +70°C, ensuring reliable performance in consumer electronics and industrial control systems requiring stable clock signals.

Feature Summary

• Compact 4-SMD no-lead package design suitable for automated surface-mount assembly processes
• High frequency stability of ±30 ppm ensures consistent timing accuracy under varying thermal conditions
• Optimized load capacitance of 18 pF for efficient integration with standard microcontroller interfaces
• Robust construction supports operation within extended industrial temperature ranges

Applications

• Microcontroller clock sources in embedded systems
• Communication module timing references
• Consumer electronics internal synchronization circuits
• Industrial control system oscillators

Procurement Notes

Verify the complete part number including suffixes such as 'T' for tape-and-reel packaging configuration. Confirm that the specified load capacitance matches the host circuit requirements. Ensure the operating temperature range aligns with the environmental conditions of the final application. Cross-reference the manufacturer's latest datasheet for any updates on material compliance or pinout definitions before placing orders.

Selection Notes

Select this component when a small form factor is required alongside moderate frequency stability. The 18 pF load capacitance is compatible with many common MCU input stages. Consider the ±30 ppm tolerance against system jitter requirements. Evaluate the 60 Ohm ESR against driver capability limits. Compare alternative packages if board space constraints differ from the 3.2x2.5 mm footprint.

Part Context

This part belongs to QST's QT325G series of high-stability crystals. The series offers various frequency options and tolerance grades to suit different timing needs. The specific model provides a balance between size, cost, and performance for mass-produced electronics. It complements other components in timing-critical designs where space is limited but reliability is essential.

Replacement Considerations

Direct substitutes must match the 28.63636 MHz frequency, 18 pF load capacitance, and 4-SMD no-lead package. Verify equivalent ESR and temperature stability specifications. Check mechanical footprint compatibility with existing PCB layouts. Ensure electrical characteristics meet the original design margins without modification.