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Product Detailed Parameters
- Description：114.444444 M XO 1.8V 2.0X1.6 PD
- Series：18QHTF21
- Mfr：Mercury Electronics Ind. Co. Ltd
- Package：Strip
- Base Resonator：Crystal
- Type：XO (Standard)
- Frequency：114.444444 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)：28mA
- 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 18QHTF21-114.444444-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 114.444444 MHz and utilizes LVCMOS output logic. The device requires a 1.8V supply voltage and features a power-down standby function for energy management. It is housed in a compact 4-SMD, No Lead package with dimensions of 0.079 inches in length and 0.063 inches in width.
Feature Summary
- LVCMOS output logic for digital interface compatibility
- Integrated power-down standby mode to reduce consumption
- Surface-mount design suitable for automated assembly
Applications
- Digital signal processing systems requiring precise clock timing
- Communication equipment utilizing high-frequency data transmission
- Embedded control units needing stable oscillator sources
Procurement Notes
Verify the specific frequency tolerance and load capacitance requirements against your circuit design before ordering. Confirm that the 1.8V supply rail is stable and within the operational limits specified in the official datasheet. Ensure the PCB footprint matches the 4-SMD, No Lead package dimensions exactly to prevent soldering defects during assembly.
Selection Notes
Select this component when a fixed 114.444444 MHz frequency is strictly required for system synchronization. Consider the 1.8V operating voltage to ensure compatibility with low-voltage logic families. Evaluate the need for power-down functionality if battery life or thermal management is a critical constraint in the final application environment.
Part Context
This part belongs to the 18QHTF21 series of surface-mount crystal oscillators from Mercury Electronics. The series offers various frequencies and voltage options, all sharing a common compact form factor. The 'PD' suffix indicates the inclusion of a power-down pin, distinguishing it from standard continuous-operation variants within the same physical package family.
Replacement Considerations
Direct substitutes include other 114.444444 MHz LVCMOS oscillators in 4-SMD packages with 1.8V operation and power-down capabilities. Verify pinout compatibility and electrical specifications before swapping manufacturers.
