18QHTF21-21.500-PD

Oscillators Overview

The 18QHTF21-21.500-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 21.5 MHz and utilizes LVCMOS output logic. The device is designed for low-voltage applications, requiring a supply voltage of 1.8V. It features a standby or power-down control function to manage power consumption effectively. The component is housed in a compact 4-SMD, No Lead package with dimensions of 2.0 x 1.6 mm. This configuration supports surface-mount assembly processes suitable for space-constrained electronic designs.

Oscillators Feature Summary

• Supports LVCMOS output logic for digital interface compatibility
• Includes standby or power-down functionality for energy management
• Operates on a single 1.8V supply voltage rail

Oscillators Applications

• General clock signal generation in embedded systems
• Timing reference sources for low-voltage digital circuits
• Compact consumer electronics requiring precise frequency control

Oscillators Procurement Notes

Verify the specific ordering suffix against manufacturer documentation to ensure correct pinout and electrical characteristics. Confirm that the 4-SMD no-lead package matches your PCB footprint requirements. Check datasheet specifications for operating temperature range and load capacitance values before integration. Ensure supply voltage stability aligns with the 1.8V requirement to maintain oscillator performance.

Oscillators Selection Notes

Select this component when a 21.5 MHz timing source is required within a 2.0x1.6mm envelope. Consider the 1.8V supply constraint and LVCMOS output drive strength relative to downstream loads. Evaluate the need for power-down capabilities if battery life or thermal management is critical. Compare against alternative frequencies if system architecture allows flexibility in clock selection.

Oscillators Part Context

This part belongs to the 18QHTF21 series of surface-mount crystal oscillators from Mercury Electronics. The series offers various frequency options within a standardized small outline package format. These oscillators are engineered for applications demanding reliable frequency stability in portable and industrial devices. The model number indicates the specific frequency and package type within the product line.

Oscillators Replacement Considerations

Direct substitutes must match the 21.5 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD no-lead package dimensions. Verify equivalent performance metrics such as phase noise and stability if available in official cross-reference data.