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Product Detailed Parameters
- Description：HC49 SMD MHZ QUARTZ XTAL / METAL
- Series：QT49S
- Mfr：QST
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：MHz Crystal
- Frequency：8 MHz
- Frequency Stability：±30ppm
- Frequency Tolerance：±30ppm
- Load Capacitance：18pF
- ESR (Equivalent Series Resistance)：80 Ohms
- Operating Mode：Fundamental
- Operating Temperature：-40°C ~ 85°C
- Ratings：-
- Mounting Type：Surface Mount
- Package / Case：HC-49/US
- Size / Dimension：0.449" L x 0.189" W (11.40mm x 4.80mm)
- Height - Seated (Max)：0.161" (4.10mm)
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Overview
The QST QT49S-8.000MAHJ-T is a surface-mount quartz crystal resonator with a nominal frequency of 8 MHz. It features an HC-49/US package measuring 12.7 x 4.8 x 3.8 mm. The unit has a load capacitance of 18 pF and a frequency stability of ±30 ppm. The equivalent series resistance is specified as 80 Ohms. This component utilizes a metal can construction for enhanced durability and signal integrity in electronic circuits.
Feature Summary
- Surface-mount design compatible with automated assembly processes
- Metal enclosure provides robust physical protection and shielding
- Standardized HC-49/US footprint ensures broad circuit board compatibility
Applications
- Microcontroller clock generation
- Communication module timing references
- Digital logic circuit synchronization
Procurement Notes
Verify the specific suffix codes against official QST documentation to ensure correct tolerance and packaging specifications. Confirm that the HC-49/US form factor aligns with the target PCB layout constraints. Cross-reference the 18 pF load capacitance requirement with the oscillator circuit design to guarantee stable oscillation conditions.
Selection Notes
Select this component when a standard surface-mount crystal with moderate stability is required. The 80 Ohm ESR suits typical low-power oscillator designs. Ensure the application environment does not exceed the thermal limits defined in the datasheet. Consider the metal package size relative to available board space during the initial schematic capture phase.
Part Context
This part belongs to the QT49S series, which represents a line of surface-mount quartz crystals manufactured by QST. The series offers various frequency options within the same mechanical envelope. These components are designed to replace traditional through-hole crystals in modern compact electronics while maintaining reliable performance standards.
Replacement Considerations
Direct substitutes include other manufacturers' HC-49/US SMD crystals with matching 8 MHz frequency, 18 pF load capacitance, and similar ESR values. Verify pinout compatibility and mounting dimensions before integration.
