QT49-8.000MEEJ-B

Overview

The QT49-8.000MEEJ-B is a through-hole quartz crystal resonator manufactured by QST, designed for precise frequency control in electronic circuits. It operates at a nominal frequency of 8 MHz with a load capacitance of 18 pF and a series resistance of 80 Ohms. The component exhibits a frequency stability of ±10 ppm across the operating temperature range of -20°C to +70°C. Housed in an HC-49/US metal package measuring 11.5 mm x 5.0 mm, it supports surface-mount or leaded applications requiring reliable timing signals.

Feature Summary

• HC-49/US metal can construction for mechanical durability
• Through-hole mounting configuration for standard PCB assembly
• Quartz resonator technology ensuring stable oscillation

Applications

• Microcontroller clock sources
• Communication equipment timing circuits
• Consumer electronics oscillator modules

Procurement Notes

Verify manufacturer documentation confirms the specific suffix MEEJ-B denotes the exact electrical parameters and packaging style. Cross-reference datasheets from authorized distributors to ensure compliance with RoHS standards and material specifications. Confirm that the HC-49/US footprint matches the target PCB design requirements before procurement.

Selection Notes

Select this component when a standard 8 MHz reference signal is required with moderate stability. Ensure the circuit design accommodates the 18 pF load capacitance to maintain accuracy within the specified ±10 ppm tolerance. Consider the physical dimensions of the HC-49/US package for adequate spacing on the printed circuit board during layout.

Part Context

This part belongs to the QT49 series of quartz crystals, widely used in general-purpose timing applications. The series offers various frequency options within the same mechanical form factor, allowing designers to standardize on a single package type while adjusting frequencies based on system requirements.

Replacement Considerations

Compatible substitutes include other HC-49/US 8 MHz crystals with matching 18 pF load capacitance and similar ESR values. Verify that alternative parts meet the same ±10 ppm stability requirement over the -20°C to +70°C temperature range to ensure functional equivalence.