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Product Detailed Parameters
- Description：64.2178 MHz XO 1.8V 2.0X1.6MM PD
- Series：18QHTF21
- Mfr：Mercury Electronics Ind. Co. Ltd
- Package：Strip
- Base Resonator：Crystal
- Type：XO (Standard)
- Frequency：64.2178 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 18QHTF21-64.2178-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 64.2178 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, suitable for surface-mount assembly on printed circuit boards.
Feature Summary
- LVCMOS output logic interface
- Integrated standby and power-down functionality
- Compact 4-SMD no-lead surface mount package
Applications
- General clock signal generation
- Digital system timing references
- Embedded electronics requiring low-power oscillators
Procurement Notes
Verify the specific part number suffix against official manufacturer documentation to ensure correct frequency and package configuration. Confirm that the 1.8V supply requirement aligns with the target circuit design. Check for any specific handling instructions related to the SMD no-lead package format during assembly.
Selection Notes
Select this component when a precise 64.2178 MHz clock source is required with low voltage operation. The LVCMOS output is compatible with standard digital logic families. Ensure the PCB layout accommodates the 4-SMD footprint and that the thermal profile supports the no-lead soldering process specified by the manufacturer.
Part Context
This model belongs to the Mercury Electronics XO series, designed for standard clock applications. The '18' prefix typically indicates the 1.8V supply voltage capability, while 'QHTF' denotes the specific series characteristics. The '-PD' suffix confirms the inclusion of power-down control features within the device architecture.
Replacement Considerations
Direct substitutes must match the 64.2178 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD package. Verify compatibility with existing power-down control signals. Cross-reference with other Mercury Electronics models in the same series for potential pin-compatible alternatives.
