QT49-25.000MBBI-B

Overview

The QT49-25.000MBBI-B is a through-hole quartz crystal oscillator manufactured by QST, designed for precise timing applications. It operates at a nominal frequency of 25 MHz with a load capacitance of 16 pF and a maximum series resistance of 30 Ohms. The component exhibits a frequency tolerance of ±50 ppm at 25°C and maintains stability within ±50 ppm over the temperature range of -20°C to +70°C. Housed in an HC-49/US package measuring 11.5 x 5 x 3.68 mm, it supports standard surface or lead mounting configurations.

Feature Summary

• Provides stable 25 MHz oscillation for clock generation circuits
• Ensures reliable timing performance across specified industrial temperature ranges
• Utilizes standard HC-49/US housing for easy integration into existing PCB layouts

Applications

• Microcontroller clock sources
• Communication interface timing
• Digital signal processing synchronization

Procurement Notes

Verify that the specific MBBI suffix corresponds to the required 16 pF load capacitance and ±50 ppm stability specifications before procurement. Confirm that the HC-49/US form factor aligns with the target board's mechanical constraints. Ensure compliance with RoHS directives if environmental regulations apply to the final assembly. Cross-reference the manufacturer's latest datasheet to validate current production status and any potential obsolescence notices prior to placing orders.

Selection Notes

Select this component when a 25 MHz reference is required with moderate stability requirements suitable for general-purpose digital logic. The HC-49/US package offers robust mechanical protection compared to smaller surface-mount alternatives. Consider the 16 pF load capacitance requirement to ensure proper circuit tuning without additional external capacitors. Evaluate thermal performance needs against the -20°C to +70°C operating range to guarantee reliability under expected environmental conditions.

Part Context

This part belongs to the QT49 series of quartz crystals from QST, which are widely used in consumer electronics and industrial equipment. The HC-49/US style represents a legacy but still prevalent packaging solution for through-hole applications. These components serve as fundamental timing elements in systems requiring accurate frequency division or clock distribution, distinguishing them from voltage-controlled oscillators or ceramic resonators.