18QHTF21-77.570634-PD

Overview

The 18QHTF21-77.570634-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a nominal frequency of 77.570634 MHz with an output logic format of LVCMOS. The device requires a supply voltage of 1.8V and features a standby mode for power down functionality. It is housed in a compact 4-SMD, No Lead package suitable for surface mount applications.

Feature Summary

• LVCMOS output logic interface
• Standby power down capability
• Surface mount 4-SMD no lead package

Applications

• General clock signal generation
• Digital system timing references
• Embedded electronics control

Procurement Notes

Verify the specific operating temperature range and load capacitance requirements against the target application design before procurement. Confirm that the 1.8V supply voltage aligns with the system power architecture. Ensure the 4-SMD footprint matches the PCB layout constraints. Cross-reference the RoHS compliance status if environmental regulations are mandatory for the end product.

Selection Notes

Select this component when a precise 77.570634 MHz reference is required with low voltage operation. The LVCMOS output is compatible with standard digital logic families. Consider the standby feature for power-sensitive designs. Evaluate the physical dimensions of the 4-SMD package to ensure adequate clearance on the circuit board relative to surrounding components.

Part Context

This part belongs to the Mercury United Electronics XO series, which provides standard frequency control solutions. The manufacturer has established expertise in crystal industry products since 1973. This specific model represents a fixed-frequency oscillator variant within their portfolio, distinct from programmable or spread-spectrum options.

Replacement Considerations

Direct substitutes must match the 77.570634 MHz frequency, LVCMOS output, and 1.8V supply voltage. Verify pin compatibility for the 4-SMD package. Check if alternative manufacturers offer equivalent stability specifications. Ensure any replacement maintains the same standby functionality and operating temperature range.