18QHTF21-1.768-OE

Overview

The 18QHTF21-1.768-OE is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co., Ltd. It operates at a nominal frequency of 1.768 MHz and utilizes LVCMOS output logic levels. The component supports a supply voltage of 1.8V and includes an active-low enable/disable control function for power management. It is housed in a compact 4-SMD, no-lead package with dimensions of 2.0 x 1.6 mm, designed for surface-mount applications requiring precise timing signals.

Feature Summary

• LVCMOS output interface for digital logic compatibility
• Integrated enable/disable pin for power control
• Compact 4-SMD no-lead surface mount package

Applications

• General clock signal generation in embedded systems
• Timing reference for low-speed microcontrollers
• Consumer electronics requiring precise timekeeping

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your circuit design before procurement. Ensure the 1.8V supply voltage aligns with your system's power rails. Confirm that the enable/disable pin polarity matches your control logic to ensure proper operation during initialization and standby modes.

Selection Notes

Select this component when a low-frequency, low-power clock source is required for space-constrained designs. The 1.768 MHz frequency is suitable for baud rate generation or slow timing references. Consider the 1.8V operating voltage constraint and the availability of the enable feature for power-sensitive applications compared to higher-voltage alternatives.

Part Context

This part belongs to the 18QHTF21 series of standard XO oscillators from Mercury Electronics. The series offers various frequencies within the same compact footprint, allowing designers to maintain consistent board layouts across different product variants while adjusting only the frequency parameter via the ordering suffix.

Replacement Considerations

Direct replacements must match the 1.768 MHz frequency, 1.8V supply, LVCMOS output, and 2.0x1.6mm 4-SMD package. Verify pinout compatibility, specifically the enable pin configuration, to ensure seamless integration without PCB redesign.