QT49S-30.000MBBK-T

Overview

The QT49S-30.000MBBK-T is a surface-mount quartz crystal oscillator manufactured by QST Corporation, operating at a fundamental frequency of 30 MHz. It utilizes an HC49-SMD package with dimensions of 12.7 x 4.8 x 3.8 mm. The component features a load capacitance of 20 pF and an equivalent series resistance (ESR) of 30 Ohms. Frequency tolerance is specified at ±50 ppm at 25°C, with stability maintained within ±50 ppm over the operating temperature range of -20°C to 70°C. This device is designed for applications requiring reliable clock signals in compact electronic systems.

Feature Summary

• Surface mount construction utilizing HC49-SMD package format
• Third overtone operation mode for stable frequency generation
• RoHS compliant manufacturing process
• Designed for general purpose clock signal applications

Applications

• General purpose clock signal generation
• Embedded system timing references
• Consumer electronics circuit boards
• Industrial control modules

Procurement Notes

Verify that the specific suffix B indicates ±50 ppm tolerance when sourcing replacements. Confirm the HC49-SMD footprint matches the PCB design requirements. Ensure the operating temperature range of -20°C to 70°C aligns with the environmental conditions of the target application. Cross-reference datasheets from authorized distributors to confirm RoHS compliance status and package dimensions prior to final procurement decisions.

Selection Notes

Select this component when a 30 MHz surface-mount crystal with moderate frequency stability is required. The HC49-SMD form factor allows for automated assembly processes. Consider the 30 Ohm ESR value for oscillator circuit compatibility. The ±50 ppm tolerance is suitable for non-critical timing applications where higher precision is not mandated. Evaluate thermal performance against the specified -20°C to 70°C range.

Part Context

This part belongs to the QT49S series of quartz crystals from QST Corporation. The series offers various frequency options and tolerance levels, identified by alphanumeric suffixes. The QT49S designation specifically denotes the HC49-SMD package style. Other variants in the series may feature different frequencies, load capacitances, or tighter tolerance specifications depending on the ordering code.

Replacement Considerations

Direct substitutes include other 30 MHz HC49-SMD crystals with matching 20 pF load capacitance and similar ESR values. Verify that alternative parts support third overtone operation if used in overtone circuits. Check that replacement components meet the same -20°C to 70°C operating temperature range and ±50 ppm stability requirements.