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Product Detailed Parameters
- Description：49.45 MHz XO 1.8V 2.0X1.6 MM PD
- Series：18QHTF21
- Mfr：Mercury Electronics Ind. Co. Ltd
- Package：Strip
- Base Resonator：Crystal
- Type：XO (Standard)
- Frequency：49.45 MHz
- Function：Standby (Power Down)
- Output：LVCMOS
- Voltage - Supply：1.8V
- Frequency Stability：±50ppm
- Absolute Pull Range (APR)：-
- Operating Temperature：-40°C ~ 85°C
- Spread Spectrum Bandwidth：-
- Current - Supply (Max)：23mA
- Ratings：-
- Mounting Type：Surface Mount
- Package / Case：4-SMD, No Lead
- Size / Dimension：0.079" L x 0.063" W (2.00mm x 1.60mm)
- Height - Seated (Max)：0.031" (0.80mm)
- Supplier Device Package：-
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Overview
The 18QHTF21-49.450-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 49.45 MHz and utilizes LVCMOS output logic. The device requires a 1.8V supply voltage and features a standby (power down) function for energy management. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.00mm x 1.60mm. This component is designed for surface mount applications.
Feature Summary
- Supports LVCMOS output logic for digital interface compatibility
- Includes standby mode functionality to reduce power consumption
- Utilizes a small form factor 4-SMD no lead package
Applications
- Battery-powered portable devices
- General purpose clock signal generation
- Digital circuit timing references
Procurement Notes
Verify the specific frequency tolerance and load capacitance requirements against the official datasheet before procurement. Confirm that the 1.8V supply voltage aligns with the target system design. Ensure the 4-SMD package footprint matches the PCB layout constraints. Check for RoHS compliance status if required by project specifications.
Selection Notes
Select this component when a low-voltage 1.8V operation is required for timing applications. Consider the 49.45 MHz frequency specifically for systems needing this exact clock rate. Evaluate the need for standby functionality to manage power budgets in portable electronics. Compare physical dimensions against available board space.
Part Context
This part belongs to the 18QHTF21 series from Mercury Electronics, which focuses on quartz crystal oscillators. The manufacturer is a Taiwan-based supplier established in 1973, specializing in frequency control products including crystals, filters, and TCXOs. This series represents their standard XO offerings with various frequency options.
Replacement Considerations
Direct substitutes include other 49.45 MHz LVCMOS oscillators in 2.0x1.6mm packages from compatible manufacturers. Verify pinout compatibility and electrical parameters such as supply voltage and current draw. Cross-reference with similar Mercury parts like the 18QHTF21-49.440-PD if frequency tolerance allows.
