18QHTF21-90.909-PD

Overview

The 18QHTF21-90.909-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd, operating at a frequency of 90.909 MHz. It utilizes LVCMOS output logic and functions with a 1.8V supply voltage. The device features a Standby (Power Down) control mode for power management. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0 x 1.6 mm. This component is designed for precise timing applications requiring low profile and stable frequency generation.

Feature Summary

• Supports LVCMOS output logic for digital interface compatibility
• Includes Standby (Power Down) functionality to reduce power consumption
• Utilizes a 4-SMD No Lead surface-mount package for space-constrained designs

Applications

• Battery-powered portable electronic devices
• General-purpose digital timing circuits
• Embedded systems requiring precise clock signals

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your system design before procurement. Confirm that the 1.8V supply voltage aligns with your target platform's power rails. Ensure the 4-SMD No Lead footprint matches your PCB layout specifications to guarantee proper soldering and mechanical stability during assembly.

Selection Notes

Select this model when a 90.909 MHz clock signal is required within a strict 2.0x1.6mm form factor. The 1.8V operation makes it suitable for modern low-voltage logic families. Consider the Standby feature if power efficiency is critical. Verify that the LVCMOS output swing meets the input thresholds of the receiving circuitry without additional buffering.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which specializes in quartz crystal oscillators. The manufacturer has produced frequency control products since 1973, focusing on crystals, filters, and oscillators. The 'PD' suffix typically indicates the inclusion of a Power Down pin or function, distinguishing it from standard continuous-operation variants within the same family.

Replacement Considerations

Direct substitutes include other 90.909 MHz LVCMOS oscillators in 2.0x1.6mm packages from compatible manufacturers. Ensure replacement parts match the 1.8V supply requirement and support Standby modes if power management is utilized. Verify pinout compatibility to avoid redesigning the PCB trace routing.