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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：16 MHz
- Frequency Stability：±30ppm
- Frequency Tolerance：±30ppm
- Load Capacitance：18pF
- ESR (Equivalent Series Resistance)：30 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 QT49S-16.000MAHJ-T is a surface-mount quartz crystal resonator manufactured by QST, operating at a nominal frequency of 16 MHz. It features a frequency stability and tolerance of ±30 ppm. The component utilizes an 18 pF load capacitance and exhibits a maximum series resistance of 30 Ohms. It is housed in an SMD package with dimensions of 12.7 mm x 4.8 mm x 3.8 mm. The device supports an operating temperature range from -40°C to +85°C.
Feature Summary
- Surface-mount design for automated assembly
- High frequency stability within ±30 ppm tolerance
- Wide operating temperature range suitable for industrial environments
Applications
- Microcontroller clock sources
- Communication module timing references
- Digital signal processing circuits
Procurement Notes
Verify the specific suffix (MAHJ-T) against official QST documentation to confirm pin configuration and termination type. Ensure the load capacitance requirement matches the target circuit design. Confirm that the ±30 ppm stability meets the system's jitter and phase noise specifications before finalizing procurement.
Selection Notes
Select this component when a 16 MHz reference is required in a compact surface-mount form factor. Consider the 30 Ohm impedance and 18 pF load capacitance compatibility with the oscillator circuit. Evaluate the -40°C to +85°C temperature range against environmental conditions to ensure long-term reliability and frequency accuracy.
Part Context
This part belongs to the QT49S series of quartz crystals from QST. The series offers various frequencies and packages, providing standardized timing solutions for electronic designs. The HC-49/US equivalent footprint allows for space-constrained applications while maintaining reliable oscillation characteristics across diverse industrial and commercial sectors.
Replacement Considerations
Direct substitutes include other manufacturers' 16 MHz SMD crystals with identical 12.7x4.8mm footprints, 18pF load capacitance, and ±30ppm stability. Verify mechanical dimensions and electrical parameters such as ESR and shunt capacitance to ensure circuit compatibility without redesign.
