QT49S-30.000MAHJ-T

Overview

The QT49S-30.000MAHJ-T is a surface-mount quartz crystal resonator manufactured by QST, designed for precision timing applications. It operates at a nominal frequency of 30 MHz with a load capacitance of 18 pF and an equivalent series resistance (ESR) of 30 Ohms. The component features a frequency stability of ±30 ppm over the operating temperature range of -20°C to +70°C. Housed in a compact HC-49S SMD package measuring 12.7 x 4.8 x 3.8 mm, it supports automated assembly processes while maintaining reliable performance in consumer electronics and communication devices.

Feature Summary

• Surface-mount design compatible with standard pick-and-place manufacturing equipment
• AT-cut quartz element providing stable oscillation characteristics
• Optimized low-profile physical dimensions for space-constrained circuit boards

Applications

• Clock signal generation in microcontroller systems
• Timing references in portable communication devices
• Oscillator circuits in consumer electronic appliances

Procurement Notes

Verify that the ordering suffix matches the required frequency tolerance and temperature range specifications. Confirm package dimensions align with PCB footprint requirements. Ensure compliance with RoHS directives if applicable to your supply chain standards. Cross-reference the manufacturer's latest datasheet for any updates on material composition or handling instructions prior to procurement.

Selection Notes

Select this component when a 30 MHz reference is required in a surface-mount configuration. Consider the 18 pF load capacitance requirement to ensure proper oscillator circuit tuning. Evaluate the ±30 ppm stability against system jitter requirements. Verify that the HC-49S form factor fits within the available board area constraints compared to smaller packages like 5032 or 3225.

Part Context

This part belongs to the QT49S series of surface-mount crystals from QST Corporation. The series offers various frequencies and tolerances within the HC-49S SMD form factor. These components serve as direct replacements for traditional through-hole HC-49U crystals where space savings are prioritized without sacrificing electrical performance or reliability standards.

Replacement Considerations

Direct substitutes include other manufacturers' HC-49S SMD crystals with identical 30 MHz frequency, 18 pF load capacitance, and similar ESR values. Ensure mechanical compatibility with existing footprints. Verify thermal stability ranges match application requirements before substitution.