18QHTF21-121.190-PD

Overview

The 18QHTF21-121.190-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 121.190 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and features a standby or power-down function to manage energy consumption. It is housed in a compact 4-SMD, no-lead package with dimensions of 2.0 x 1.6 mm. This component is engineered for surface-mount applications requiring precise timing signals.

Feature Summary

• Supports low-voltage operation at 1.8V with LVCMOS interface compatibility
• Includes standby mode functionality for power management
• Utilizes a small-footprint 4-SMD no-lead package design

Applications

• Digital signal processing systems requiring clock synchronization
• Communication equipment utilizing high-frequency timing references
• Embedded control units needing stable oscillator sources

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your circuit design before ordering. Confirm that the 1.8V supply voltage aligns with your system's power rails. Ensure the PCB footprint matches the 2.0x1.6mm SMD package dimensions. Check for any specific reflow soldering profile recommendations provided in the manufacturer datasheet to ensure reliable assembly and long-term performance.

Selection Notes

Select this model when a 121.190 MHz clock signal is required within a space-constrained environment. The choice is appropriate for designs prioritizing low power consumption due to the standby feature. Consider the LVCMOS output level compatibility with downstream logic gates. Evaluate if the 1.8V operating voltage fits the available power distribution network without additional regulation steps.

Part Context

This part belongs to the 18QHTF21 series of surface-mount oscillators from Mercury Electronics. The series offers various frequencies and voltage options, such as 1.8V and 2.5V variants. These components are generally used in portable electronics and industrial controls where size and power efficiency are critical constraints compared to larger through-hole alternatives.

Replacement Considerations

Direct substitutes must match the 121.190 MHz frequency, 1.8V supply, and LVCMOS output. Verify pinout compatibility for the 4-SMD no-lead package. Alternative models from other manufacturers require careful evaluation of jitter specifications and phase noise characteristics to ensure functional equivalence in the target application.