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Product Detailed Parameters
- Description：79.0 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：79 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 18QHTF21-79.000-OE is a 79 MHz crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It utilizes LVCMOS output logic and operates at a supply voltage of 1.8V. The component features an Enable/Disable control function for power management. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0mm x 1.6mm and a maximum seated height of 0.80mm.
Feature Summary
- Compact surface-mount design suitable for space-constrained applications
- Integrated enable/disable functionality for efficient power management
- Standard LVCMOS output logic compatibility
Applications
- Portable electronic devices requiring low-power timing solutions
- Communication equipment utilizing standard digital interfaces
- Embedded systems needing precise clock signals
Procurement Notes
Verify the specific frequency tolerance and load capacitance requirements against your circuit design before procurement. Ensure the 1.8V supply voltage aligns with your system's power rails. Confirm that the LVCMOS output levels are compatible with the receiving logic inputs to prevent signal integrity issues or potential damage to connected components.
Selection Notes
Select this component when a small form factor and low operating voltage are critical. The 1.8V specification makes it suitable for modern battery-powered devices. Consider the Enable/Disable feature if dynamic power saving is required. Verify that the 79 MHz frequency meets the exact timing needs of the target application without requiring additional frequency multiplication or division stages.
Part Context
This part belongs to the 18QHTF21 series from Mercury Electronics, which specializes in quartz-based frequency control products. The series includes various oscillators such as TCXOs and VCTCXOs. This specific model represents a standard XO variant designed for general-purpose timing applications where size and power efficiency are prioritized over high stability.
Replacement Considerations
Direct substitutes include other 79 MHz LVCMOS oscillators in 2.0x1.6mm packages from manufacturers like Epson or NDK. Ensure replacement parts match the 1.8V supply requirement and pinout configuration. Verify that the replacement offers similar enable/disable functionality and output drive strength.
