18QHTF21-6.76438-OE

Overview

The 18QHTF21-6.76438-OE is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 6.76438 MHz and utilizes LVCMOS output logic. The device requires a 1.8V supply voltage and features an enable/disable function for power management. It is housed in a compact 4-SMD, no-lead package with dimensions of 2.0mm x 1.6mm. The component supports an operating temperature range from -40°C to 85°C and maintains a frequency stability of ±50ppm.

Feature Summary

• Supports LVCMOS output logic for digital interface compatibility
• Includes enable/disable control functionality
• Compact 4-SMD no-lead surface mount package

Applications

• General purpose timing reference in embedded systems
• Clock source for microcontrollers requiring 1.8V operation
• Consumer electronics with space-constrained PCB layouts

Procurement Notes

Verify the specific frequency suffix (6.76438) matches the design requirement, as this series offers multiple frequency options. Confirm the 1.8V supply voltage aligns with the target system's power rails. Ensure the LVCMOS output type is compatible with the receiving logic inputs. Check that the -40°C to 85°C industrial temperature range meets environmental specifications. Validate the 4-SMD no-lead footprint against the PCB layout guidelines.

Selection Notes

Select this component when a precise 6.76438 MHz clock signal is required for 1.8V logic circuits. The LVCMOS output ensures direct interfacing with standard digital components without additional level shifting. The enable/disable feature allows for dynamic power management in battery-operated devices. Consider the ±50ppm stability for applications tolerant to moderate frequency drift. The small 2.0x1.6mm package is suitable for high-density board designs.

Part Context

This part belongs to the 18QHTF21 series of standard XO oscillators from Mercury Electronics. The series provides various frequencies with consistent 1.8V operation and LVCMOS outputs. Mercury Electronics specializes in quartz crystals and timing solutions, offering this component as a reliable timing source for commercial and industrial applications requiring low profile and stable performance.

Replacement Considerations

Direct substitutes within the same series include 18QHTF21-9.465-OE and 18QHTF21-86.643-OE, which share identical packaging and electrical characteristics but differ in frequency. Verify that any replacement maintains the 6.76438 MHz requirement or adjust circuit timing accordingly.