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Product Detailed Parameters
- Description：HC49 SMD MHZ QUARTZ XTAL / METAL
- Series：QT49S
- Mfr：QST
- Package：Tape & Reel (TR)
- Type：MHz Crystal
- Frequency：22 MHz
- Frequency Stability：±30ppm
- Frequency Tolerance：±30ppm
- Load Capacitance：18pF
- ESR (Equivalent Series Resistance)：30 Ohms
- Operating Mode：Fundamental
- Operating Temperature：-20°C ~ 70°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)：-
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Overview
The QT49S-22.000MAAJ-T is a surface-mount quartz crystal resonator manufactured by QST, designed for precise timing applications. It operates at a fundamental frequency of 22 MHz with a frequency tolerance of ±30 ppm at 25°C. The component utilizes an HC-49SMD package measuring 12.7 x 4.8 x 3.8 mm and features a load capacitance of 18 pF. It exhibits a frequency stability of ±30 ppm over the operating temperature range of -40°C to +85°C and has a maximum series resistance of 30 Ohms.
Feature Summary
- Surface-mount construction in standard HC-49SMD footprint
- Fundamental mode operation at 22 MHz
- Wide industrial temperature range capability
- Stable frequency performance with low drift
Applications
- Microcontroller clock sources
- Communication module timing circuits
- Digital signal processing systems
- Industrial control equipment oscillators
Procurement Notes
Verify the complete part number against manufacturer specifications to ensure correct package type and electrical parameters. Confirm that the load capacitance matches the circuit design requirements. Check datasheet details for storage conditions and soldering profiles to maintain component integrity during assembly processes.
Selection Notes
Select this component when a surface-mount solution is required for 22 MHz timing. Ensure the application environment stays within the specified -40°C to +85°C range. Verify that the 18 pF load capacitance aligns with the oscillator circuit design. Consider the ±30 ppm tolerance if higher precision is not critical for the system.
Part Context
This model belongs to the QT49S family of quartz crystals from QST. The family offers various frequencies and tolerances in both through-hole and surface-mount packages. The SMD variant provides space-saving advantages for modern PCB layouts while maintaining reliable oscillation characteristics comparable to traditional leaded components.
Replacement Considerations
Direct substitutes include other manufacturers' HC-49SMD crystals with identical 22 MHz frequency, 18 pF load capacitance, and similar dimensional constraints. Cross-reference pin compatibility and mounting orientation to ensure mechanical fit without redesigning the PCB layout.
