18QHTF21-43.750-PD

Oscillators Overview

The 18QHTF21-43.750-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 43.75 MHz and utilizes LVCMOS output logic. The device is designed for low-power applications, featuring a supply voltage of 1.8V and a standby power-down mode to conserve energy during inactivity. It is housed in a compact 4-SMD, no-lead package with dimensions of 2.0mm x 1.6mm. This component serves as a precise clock source for digital circuits requiring stable timing signals within the specified operating temperature range.

Oscillators Feature Summary

• Integrates LVCMOS output logic for direct interfacing with digital loads
• Supports standby power-down mode for enhanced energy efficiency
• Utilizes a compact surface-mount package suitable for space-constrained designs

Oscillators Applications

• Clock generation for embedded systems
• Timing reference for communication interfaces
• Power management circuits requiring precise synchronization

Oscillators Procurement Notes

Verify the specific ordering suffix to ensure the correct package type and frequency tolerance match the design requirements. Confirm that the 1.8V supply voltage aligns with the target system's power rails. Check the datasheet for the operating temperature range to ensure environmental compatibility. Ensure the LVCMOS output swing is compatible with the receiving logic levels of the connected components.

Oscillators Selection Notes

Select this component when a low-profile, low-voltage clock source is required for high-density PCB layouts. The 1.8V operation makes it suitable for modern portable and battery-powered devices. Consider the 2.0x1.6mm footprint for board space optimization. Verify that the LVCMOS output is appropriate for the downstream circuitry without additional level shifting.

Oscillators Part Context

This part belongs to the 18QHTF series of standard crystal oscillators from Mercury Electronics. The series offers various frequencies and package sizes, including 3.2x2.5mm variants. The 18QHTF21 specifically denotes the 2.0x1.6mm SMD form factor. These oscillators are designed to replace discrete crystal and buffer solutions, providing a single-component timing solution for mass production electronics.

Oscillators Replacement Considerations

Direct replacements must match the 43.75 MHz frequency, 1.8V supply, LVCMOS output, and 2.0x1.6mm package dimensions. Cross-reference with other manufacturers' 18QHTF21-compatible parts or equivalent 4-SMD no-lead oscillators. Ensure pinout compatibility and thermal characteristics are identical to avoid rework.