18QHTF21-124.870-PD

Overview

The 18QHTF21-124.870-PD is a crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 124.87 MHz with an LVCMOS output logic level. The device requires a supply voltage of 1.8V and features a power-down function for standby mode control. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0mm x 1.6mm. The component is RoHS compliant and has a Moisture Sensitivity Level (MSL) rating of 1, indicating unlimited shelf life under standard conditions.

Feature Summary

• Supports low-voltage operation at 1.8V with LVCMOS output compatibility
• Includes power-down functionality for energy-efficient standby modes
• Utilizes a small form factor 4-SMD no-lead surface mount package

Applications

• Digital signal processing systems requiring precise clock timing
• Communication equipment utilizing high-frequency data transmission
• Embedded systems with strict space constraints and low power requirements

Procurement Notes

Verify the specific ordering suffix to ensure the correct voltage and package variant matches the design requirements. Confirm that the 1.8V supply rail is stable within the specified tolerance before integration. Check for RoHS compliance documentation if environmental regulations apply to the final assembly. Ensure proper handling procedures are followed despite the MSL 1 rating during storage and reflow processes.

Selection Notes

Select this component when a 124.87 MHz clock source is required in a minimal footprint. The 1.8V operating voltage makes it suitable for modern low-power digital circuits. Consider the power-down feature if system-level energy management is a priority. Compare against other Mercury QHTF series variants to ensure the package size and electrical characteristics align with the PCB layout and thermal constraints.

Part Context

This part belongs to the QHTF series of crystal oscillators from Mercury Electronics. The series offers various frequencies and package sizes. The 18 prefix typically indicates the 1.8V supply voltage requirement. The PD suffix denotes the inclusion of a power-down pin or function. This specific model provides a fixed frequency output optimized for standard digital interfaces.

Replacement Considerations

Direct substitutes include other 124.87 MHz LVCMOS oscillators in 2.0x1.6mm packages with 1.8V operation. Verify pinout compatibility and electrical specifications before swapping. Cross-reference with similar Mercury models like the 25QHTF series if voltage or size differences are acceptable.