QT49-16.000MAAJ-B

Overview

The QT49-16.000MAAJ-B is a surface-mount AT-cut crystal resonator manufactured by QST, designed for precision timing applications. It operates at a nominal frequency of 16 MHz with a load capacitance of 18 pF and a frequency tolerance of ±30 ppm at 25°C. The component features an HC-49/US package style with SMD/SMT termination, measuring approximately 12.7 mm in length, 4.8 mm in width, and 3.8 mm in height. It supports an operating temperature range from -40°C to +85°C and utilizes a 100 uW drive level.

Feature Summary

• AT-cut quartz construction ensures high frequency stability and low aging rates over time.
• Surface-mount design facilitates automated assembly and compact PCB layout integration.
• HC-49/US form factor provides mechanical robustness compatible with standard mounting footprints.

Applications

• Microcontroller clock sources
• Communication interface timing circuits
• Digital signal processing systems

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet to confirm exact electrical parameters and packaging details. Ensure compatibility with reflow soldering profiles specified for the HC-49/US SMD variant. Check for any recent lifecycle status updates or alternative lead times due to supply chain variations.

Selection Notes

Select this component when a 16 MHz reference is required with ±30 ppm initial tolerance and operation within -40°C to +85°C. Confirm that the 18 pF load capacitance matches the oscillator circuit requirements. Evaluate space constraints against the 12.7 x 4.8 x 3.8 mm dimensions to ensure adequate PCB real estate for the SMD package.

Part Context

This part belongs to the QT49 series of MHz crystals from QST, which are widely used in consumer electronics and industrial control systems. The series offers various frequency options and tolerance grades, with the MAAJ-B suffix indicating specific performance characteristics including the 16 MHz frequency and ±30 ppm tolerance.

Replacement Considerations

Direct substitutes include other manufacturers' HC-49/US SMD crystals with identical 16 MHz frequency, 18 pF load capacitance, and ±30 ppm tolerance. Verify pinout compatibility and thermal characteristics before substitution.