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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：48 MHz
- Frequency Stability：±50ppm
- Frequency Tolerance：±50ppm
- Load Capacitance：20pF
- ESR (Equivalent Series Resistance)：80 Ohms
- Operating Mode：3rd Overtone
- 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-48.000MBBK-T is a surface-mount quartz crystal manufactured by QST, operating at a fundamental frequency of 48 MHz. It features a frequency stability and tolerance of ±50 ppm and a load capacitance of 20 pF. The component utilizes an HC-49/US package with dimensions of 11.40mm length, 4.80mm width, and a maximum height of 3.80mm. It exhibits an equivalent series resistance (ESR) of 80 Ohms and operates within a temperature range of -20°C to +70°C. The device is RoHS compliant and packaged in tape and reel format.
Feature Summary
- Resistance-welded metal can construction for enhanced durability
- Surface mount design compatible with automated assembly processes
- Fundamental mode operation ensuring stable oscillation
Applications
- Digital signal processing circuits
- Microcontroller clock sources
- Communication equipment timing references
Procurement Notes
Verify the specific suffix 'BBK' against the manufacturer's current part number guide to ensure correct packaging and material specifications. Confirm that the HC-49/US footprint matches the target PCB design. Check for any recent product change notices regarding environmental compliance or manufacturing location updates.
Selection Notes
Select this component when a 48 MHz fundamental frequency with ±50 ppm stability is required in a compact surface-mount form factor. Ensure the circuit design accounts for the 80 Ohm ESR and 20 pF load capacitance. Verify that the operating temperature range meets the application's thermal requirements.
Part Context
This crystal belongs to the QT49S series, which consists of SMD quartz crystals designed for general-purpose timing applications. The series offers various frequencies and packages, providing a standardized solution for replacing through-hole components in modern electronics manufacturing.
Replacement Considerations
The discontinued TXC 9C-12.000MBBK-T is listed as a parameter-equivalent substitute, though it differs in frequency. For direct replacement, verify electrical compatibility with other 48 MHz SMD crystals from different manufacturers.
