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Product Detailed Parameters
- Description：77.8 MHz XO 1.8V 2.0X1.6 MM OE
- Series：18QHTF21
- Mfr：Mercury Electronics Ind. Co. Ltd
- Package：Strip
- Base Resonator：Crystal
- Type：XO (Standard)
- Frequency：77.8 MHz
- Function：Enable/Disable
- 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)：26mA
- 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 18QHTF21-77.800-OE is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 77.8 MHz and utilizes LVCMOS output logic levels. The device supports a supply voltage of 1.8V and includes an enable/disable control function for power management. It is housed in a compact 4-SMD, No Lead package, designed for surface-mount applications requiring precise timing signals.
Feature Summary
- Supports LVCMOS output interface
- Includes enable/disable control functionality
- Operates on 1.8V supply voltage
Applications
- Digital signal processing systems
- Communication equipment timing
- Embedded system clock generation
Procurement Notes
Verify the specific ordering suffix OE against the manufacturer's current documentation to ensure compatibility with required enable/disable features and voltage specifications. Confirm that the 4-SMD no-lead package dimensions align with the target PCB footprint. Cross-reference the 77.8 MHz frequency tolerance requirements with system design constraints before finalizing procurement orders.
Selection Notes
Select this component when a low-voltage 1.8V operation is required alongside standard LVCMOS signaling. The integrated enable/disable feature makes it suitable for power-sensitive designs. Ensure the application can accommodate the 4-SMD no-lead form factor and that the 77.8 MHz frequency meets the specific timing needs of the circuit without requiring additional frequency multiplication or division stages.
Part Context
This oscillator belongs to Mercury Electronics' line of quartz-based frequency control products. The company specializes in manufacturing crystals, oscillators, and filters. This specific model represents their standard XO series, providing reliable timing solutions for electronic circuits requiring stable clock signals.
Replacement Considerations
Direct substitutes include other 77.8 MHz LVCMOS oscillators in 4-SMD packages from compatible manufacturers. Verify pinout compatibility and voltage levels. Models such as 18QHTF21-77.800 from the same family may offer identical electrical characteristics.
