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Product Detailed Parameters
- Description：122.76785 M XO 1.8V 2.0X1.6MM PD
- Series：18QHTF21
- Mfr：Mercury Electronics Ind. Co. Ltd
- Package：Strip
- Base Resonator：Crystal
- Type：XO (Standard)
- Frequency：122.76785 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 18QHTF21-122.76785-PD is a crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 122.76785 MHz and utilizes LVCMOS output logic. The device supports a supply voltage of 1.8V and includes a standby or power-down function for energy management. It is housed in a compact 4-SMD, No Lead package, designed for surface-mount applications requiring precise timing signals.
Feature Summary
- Supports low-voltage operation with integrated standby capability
- Provides stable clock signals via LVCMOS interface
- Utilizes leadless surface-mount packaging for automated assembly
Applications
- High-speed digital signal processing systems
- Communication equipment requiring precise clock synchronization
- Embedded computing modules needing low-power clock 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 within the operational limits specified in the official datasheet. Ensure the PCB footprint matches the 4-SMD No Lead package dimensions to prevent soldering defects during assembly.
Selection Notes
Select this component when a fixed frequency of 122.76785 MHz is required with LVCMOS compatibility. Consider the 1.8V operating voltage and standby feature for power-sensitive designs. Evaluate the thermal performance and size constraints of the 4-SMD package relative to the target application environment.
Part Context
This part belongs to the 18QHTF21 series of standard crystal oscillators from Mercury Electronics. The series offers various frequencies with consistent LVCMOS outputs and low-voltage support. The 'PD' suffix typically indicates a specific pin configuration or tape-and-reel packaging variant, distinct from bare units.
Replacement Considerations
Direct substitutes must match the 122.76785 MHz frequency, LVCMOS output, 1.8V supply, and 4-SMD No Lead package. Verify electrical parameters such as jitter and stability against the original specification to ensure system compatibility.
