18QHTF21-1.005-PD

Overview

The 18QHTF21-1.005-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd, operating at a frequency of 1.005 MHz. It utilizes LVCMOS output logic and requires a 1.8V supply voltage. The device features a standby function for power down capabilities. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0x1.6 mm. The unit maintains a frequency stability of ±50ppm and operates within a temperature range of -40°C to 85°C.

Feature Summary

• Supports LVCMOS output logic for digital interface compatibility
• Includes standby mode functionality for power management
• Designed for low voltage operation at 1.8V

Applications

• Battery-powered portable devices
• General purpose clock signal generation
• Embedded system timing references

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the target circuit design before procurement. Confirm that the 1.8V supply voltage aligns with the system's power rails. Ensure the 4-SMD no-lead package footprint matches the PCB layout specifications. Cross-reference the datasheet for precise electrical characteristics to guarantee reliable operation across the specified temperature range.

Selection Notes

Select this component when a low-voltage, small-footprint oscillator is required for applications needing 1.005 MHz timing. The LVCMOS output is suitable for standard digital logic families. Consider the ±50ppm stability for general-purpose applications rather than high-precision metrology. The standby feature adds value for systems requiring power efficiency during idle states.

Part Context

This part belongs to the 18QHTF21 series of surface-mount oscillators from Mercury Electronics. The series offers various frequencies and supply voltages, typically utilizing SMD packages for automated assembly. The 'PD' suffix indicates the presence of a power-down or standby control pin, distinguishing it from continuous-output variants.

Replacement Considerations

Direct substitutes must match the 1.005 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD 2.0x1.6mm package. Verify pinout compatibility and thermal characteristics. Alternative parts from other manufacturers require careful evaluation of frequency stability and operating temperature ranges to ensure functional equivalence.