18QHTF21-74.4955-PD

Overview

The 18QHTF21-74.4955-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronic Ind. Co., Ltd. It operates at a fixed frequency of 74.4955 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and features a standby or power-down mode capability. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0 x 1.6 mm.

Feature Summary

• Supports low-voltage operation at 1.8V
• Includes standby and power-down functionality
• Utilizes LVCMOS output logic

Applications

• General timing clock applications
• Embedded systems requiring precise frequency references
• Portable electronic devices due to low voltage requirements

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your circuit design before procurement. Ensure that the 1.8V supply voltage aligns with your system's power rails. Confirm that the 4-SMD no-lead package footprint matches your PCB layout constraints. Check for any specific RoHS compliance documentation if required by your manufacturing standards.

Selection Notes

Select this component when a 74.4955 MHz reference signal is required with low power consumption. The 1.8V operating voltage makes it suitable for modern low-power digital circuits. Consider the small 2.0x1.6mm package size for space-constrained designs. Verify compatibility with LVCMOS interfaces in the target application.

Part Context

This part belongs to the QHTF series of surface-mount crystal oscillators from Mercury Electronics. The '18' prefix indicates the 1.8V supply voltage variant, while '21' denotes the package type. The '-PD' suffix signifies the inclusion of a power-down pin or function. This series is designed for high-reliability timing applications in consumer and industrial electronics.

Replacement Considerations

Direct replacements must match the 74.4955 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD 2.0x1.6mm package. Verify electrical parameters such as frequency stability and phase noise. Ensure the replacement supports the same power-down functionality.