QT325G-14.7456MAHJ-T

Overview

The QT325G-14.7456MAHJ-T is a quartz crystal resonator manufactured by QST, designed for surface-mount applications. It operates at a fundamental frequency of 14.7456 MHz with a frequency stability tolerance of ±30 ppm across the -40°C to +85°C temperature range. The component features an 18 pF load capacitance and a maximum series resistance of 100 Ohms. It utilizes a 4-SMD, no-lead package with body dimensions of 3.2 x 2.5 x 0.8 mm, employing a glass seal construction for environmental protection.

Feature Summary

• Glass-sealed quartz crystal resonator for enhanced environmental stability
• Surface-mount design with no-lead 4-terminal configuration
• Operates within extended industrial temperature range of -40°C to +85°C

Applications

• Clock signal generation in digital communication systems
• Timing reference for microcontroller circuits
• Frequency control in consumer electronic devices

Procurement Notes

Verify the specific suffix 'H' confirms the ±30 ppm stability rating over the -40°C to +85°C range as documented in QST specifications. Ensure compatibility with 18 pF load capacitance requirements in the target circuit design. Confirm that the 100 Ohm maximum series resistance meets the oscillator driver strength limitations. Cross-reference the 3.2x2.5mm footprint against PCB layout guidelines to prevent mechanical interference.

Selection Notes

Select this component when a precise 14.7456 MHz timing source is required for SMD assembly processes. The ±30 ppm tolerance suits general-purpose digital applications where high precision is not critical. The glass-seal technology provides reliability in standard operating environments. Consider the 100 Ohm ESR limit when designing the oscillator feedback network to ensure reliable startup and stable operation under varying load conditions.

Part Context

This part belongs to the QT325G family of quartz crystals from QST, characterized by a 3.2x2.5mm surface-mount footprint. The 'H' suffix denotes the specific frequency stability grade of ±30 ppm over the industrial temperature range. These components are widely used in compact electronics requiring reliable clock signals without the bulk of through-hole alternatives.

Replacement Considerations

Direct substitutes must match the 14.7456 MHz frequency, 18 pF load capacitance, and 3.2x2.5mm package dimensions. Verify equivalent ±30 ppm stability over -40°C to +85°C and similar ESR characteristics. Generic equivalents may require validation of drive level sensitivity and start-up time performance.