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Product Detailed Parameters
- Description：6.864 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：6.864 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)：21mA
- 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 18QHTF21-6.864-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 6.864 MHz and utilizes LVCMOS output logic. The device is designed for low-voltage applications, requiring a supply voltage of 1.8V. It features a standby mode for power management. The component is housed in a compact 4-SMD, No Lead package with dimensions of 2.0 x 1.6 mm. This series supports various frequencies within the specified voltage range.
Feature Summary
- Supports LVCMOS output logic for digital interface compatibility
- Includes standby (power down) functionality for energy efficiency
- Utilizes a lead-free surface-mount package for automated assembly
Applications
- Battery-powered portable devices
- General-purpose timing circuits
- Digital signal processing systems
Procurement Notes
Verify the specific frequency tolerance and load capacitance requirements against the target circuit design before procurement. Confirm that the 1.8V supply rail is stable and within the operational limits defined in the official datasheet. Ensure the PCB footprint matches the 2.0x1.6mm SMD no-lead package specifications to prevent mounting issues during assembly.
Selection Notes
Select this component when a precise 6.864 MHz clock source is required for low-power applications. The LVCMOS output is suitable for direct interfacing with standard digital logic families. Consider the 1.8V operating voltage constraint when designing the power distribution network. The small form factor makes it appropriate for space-constrained designs where board real estate is limited.
Part Context
This part belongs to the Mercury Electronics XO series, which offers various frequency options within a standardized 1.8V platform. The 18QHTF21 series is characterized by its compact 4-pin SMD no-lead package. Similar parts in this family include different frequency variants such as 50.2067 MHz or 33.784 MHz, sharing identical electrical and mechanical characteristics except for the oscillation frequency.
Replacement Considerations
Direct substitutes include other 18QHTF21 series variants from Mercury Electronics with matching 6.864 MHz frequency and 1.8V operation. Cross-brand replacements must match the LVCMOS output type, 4-SMD no-lead package dimensions, and 1.8V supply voltage. Verify pinout compatibility and thermal performance before substitution.
