18QHTF21-40.0789-PD

Oscillators Overview

The 18QHTF21-40.0789-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co., Ltd. It operates at a fixed frequency of 40.0789 MHz and utilizes LVCMOS output logic levels. The device is designed for a supply voltage of 1.8V and features a power-down function via a standby control input. It is housed in a compact 4-SMD, no-lead package with dimensions of 2.0 x 1.6 mm. This component serves as a precise clock source for digital circuits requiring low-voltage operation and controlled power consumption.

Oscillators Feature Summary

• Generates a stable 40.0789 MHz clock signal using LVCMOS logic outputs
• Operates on a single 1.8V power supply rail
• Includes a standby mode to disable the oscillator and reduce current draw
• Utilizes a small form-factor 4-SMD no-lead surface mount package

Oscillators Applications

• Clock generation for high-speed digital data buses
• Timing reference for communication interface controllers
• Power management systems requiring low-voltage clock sources
• Embedded systems with strict size constraints

Oscillators Procurement Notes

Verify that the specific part number suffix matches the required voltage and package configuration. Confirm that the 1.8V supply requirement aligns with the target system's power rails. Ensure the LVCMOS output compatibility is suitable for the receiving logic inputs. Check for any specific handling requirements associated with the no-lead SMD package during assembly.

Oscillators Selection Notes

Select this component when a 40.0789 MHz frequency is strictly required alongside a 1.8V operating voltage. Consider the 2.0x1.6mm footprint if board space is limited. Evaluate the need for a power-down feature to manage system energy efficiency. Ensure the LVCMOS output swing is compatible with the downstream circuitry without additional level shifting.

Oscillators Part Context

This oscillator belongs to the 18QHTF21 series from Mercury Electronics, which focuses on low-voltage, small-footprint timing solutions. The series typically offers various frequencies and voltage options within similar physical packages. Mercury Electronics is a specialized manufacturer of frequency control products, emphasizing quartz crystal technology for industrial and consumer applications.

Oscillators Replacement Considerations

Direct substitutes must match the 40.0789 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD no-lead package dimensions. Verify pinout compatibility and electrical characteristics before substitution. Alternative parts from other manufacturers may require design review for voltage tolerance and load capacitance.