QT49S-27.000MBBK-T

Overview

The QT49S-27.000MBBK-T is a surface-mount quartz crystal oscillator manufactured by QST, operating at a nominal frequency of 27 MHz. It features a HC-49/US package with dimensions of 12.7 x 4.8 x 3.8 mm. The component exhibits a frequency stability of ±50 ppm at 25°C and operates within a temperature range of -20°C to +70°C. It utilizes a load capacitance of 20 pF and has an equivalent series resistance of 30 Ohms. The device is RoHS3 compliant and lead-free.

Feature Summary

• Resistance-welded metal can construction for durability
• Surface-mount design compatible with automated assembly
• RoHS3 compliant and lead-free manufacturing

Applications

• Frequency reference in communication systems
• Clock generation for digital circuits
• Microcontroller timing sources

Procurement Notes

Verify the specific suffix 'BBK' against official QST documentation to confirm package type and tolerance specifications. Ensure the requested quantity matches standard reel packaging requirements. Confirm RoHS3 compliance status if required by regulatory standards. Cross-reference the manufacturer part number with authorized distributor catalogs to avoid counterfeit components. Validate operating temperature range suitability for the intended application environment before finalizing procurement.

Selection Notes

Select this component when a 27 MHz surface-mount crystal with ±50 ppm stability is required. The HC-49/US form factor allows for compact PCB integration compared to through-hole variants. Consider the 20 pF load capacitance requirement for circuit matching. Evaluate the -20°C to +70°C operating range against environmental conditions. Compare equivalent series resistance values for power consumption considerations.

Part Context

This model belongs to the QT49S series of surface-mount crystals from QST. The series offers various frequencies ranging from 3.2 MHz to 90 MHz. These components are designed as direct replacements for traditional HC-49/U through-hole crystals in modern SMD-based designs. The series emphasizes reliability through resistance-welded metal cans.

Replacement Considerations

Direct substitutes include other 27 MHz SMD crystals with identical HC-49/US footprints and ±50 ppm stability. Verify load capacitance and ESR compatibility when cross-referencing with alternative manufacturers. Ensure thermal performance meets the -20°C to +70°C specification.