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Product Detailed Parameters
- Description：78.125 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：78.125 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 18QHTF21-78.125-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co., Ltd. It operates at a frequency of 78.125 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and includes a standby or power-down function. It is housed in a compact 4-SMD, no-lead package with dimensions of 2.0x1.6mm.
Feature Summary
- Supports low-voltage operation at 1.8V
- Integrates standby mode for power management
- Provides LVCMOS signal compatibility
Applications
- Digital signal processing systems
- Communication equipment timing
- Embedded system clock generation
Procurement Notes
Verify the specific frequency tolerance and load capacitance requirements against the official datasheet before procurement. Confirm that the 1.8V supply voltage aligns with the target circuit design. Ensure the 4-SMD no-lead package footprint matches the PCB layout specifications to guarantee proper soldering and mechanical stability during assembly.
Selection Notes
Select this component when a precise 78.125 MHz clock source is required for LVCMOS interfaces. Consider the 1.8V operating voltage constraint and the need for power-down capabilities. Evaluate the physical size constraints due to the small 2.0x1.6mm package. Ensure the application environment supports the specified operating temperature range defined in the manufacturer's documentation.
Part Context
This part belongs to the 18QHTF21 series of surface-mount oscillators from Mercury Electronics. The series offers various frequencies with standardized LVCMOS outputs. The 'PD' suffix indicates the inclusion of a power-down control feature. These components are designed for applications requiring stable clock signals in space-constrained electronic devices.
Replacement Considerations
Direct substitutes must match the 78.125 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD no-lead package. Verify pinout compatibility and electrical characteristics with alternative manufacturers. Cross-reference with other Mercury Electronics models in the same series if availability is an issue.
