18QHTF21-11.999-PD

Overview

The 18QHTF21-11.999-PD is a standard crystal oscillator manufactured by Mercury Electronic Ind. Co., Ltd. It operates at a nominal frequency of 11.999 MHz with an LVCMOS output logic level. The device requires a supply voltage of 1.8V and features a power-down (standby) function for energy management. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0 x 1.6 mm.

Feature Summary

• Supports LVCMOS output logic for digital interface compatibility
• Includes standby mode to reduce power consumption when inactive
• Utilizes a leadless surface-mount package for automated assembly

Applications

• General-purpose clock signal generation in electronic circuits
• Timing reference for low-voltage digital systems
• Embedded devices requiring compact oscillator solutions

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the official datasheet before integration. Confirm that the 1.8V supply rail stability meets the oscillator's specifications. Ensure the PCB layout adheres to the recommended footprint for the 4-SMD no-lead package to maintain signal integrity and mechanical reliability during operation.

Selection Notes

Select this component when a precise 11.999 MHz timing source is required within space-constrained designs. The choice is driven by the need for low-voltage operation and power-saving capabilities via the standby feature. Consider the small form factor suitable for high-density board layouts where traditional packages cannot fit.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronic Ind. Co., Ltd, which offers various frequencies within a standardized 2.0x1.6mm package. The series provides options for different supply voltages and output types, allowing designers to select components based on specific system voltage levels and interface requirements while maintaining consistent physical dimensions.

Replacement Considerations

Direct substitutes include other 18QHTF21 variants with identical pinout and package dimensions but different frequencies, such as 18QHTF21-18.080-PD or 18QHTF21-38.680-PD, provided the system clock requirement allows for frequency adjustment.