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Product Detailed Parameters
- Description：68.695 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：68.695 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)：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 18QHTF21-68.695-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 68.695 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and features a standby or power-down mode capability. It is housed in a compact 4-SMD, No Lead package, suitable for surface-mount applications requiring precise timing signals.
Feature Summary
- LVCMOS output logic interface
- Integrated standby and power-down functionality
- Surface-mount 4-SMD no lead package
Applications
- General clock signal generation
- Digital system timing references
- Embedded electronics control circuits
Procurement Notes
Verify the specific frequency tolerance and load capacitance requirements against the target circuit design before procurement. Confirm that the 1.8V supply voltage aligns with the system power rails. Ensure the 4-SMD footprint matches the PCB layout silkscreen and solder mask definitions to prevent assembly errors during manufacturing.
Selection Notes
Select this component when a stable 68.695 MHz reference is required with low power consumption capabilities. The LVCMOS output ensures compatibility with standard digital logic families operating at 1.8V. Consider the physical dimensions of the 4-SMD package for space-constrained designs requiring reliable surface-mount integration.
Part Context
This part belongs to the 18QHTF21 series from Mercury Electronics, which specializes in quartz crystal frequency control products. The manufacturer has a long history in Taiwan's crystal industry. This specific model represents a standard XO variant within their portfolio, offering consistent performance for general-purpose timing applications.
Replacement Considerations
Direct substitutes must match the 68.695 MHz frequency, LVCMOS output type, 1.8V supply voltage, and 4-SMD package. Verify pinout compatibility and electrical characteristics such as phase noise and jitter if available in official datasheets.
