18QHTF21-1.18784-PD

Overview

The 18QHTF21-1.18784-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 1.18784 MHz with a stability of 50 ppm. The device utilizes LVCMOS output logic and requires a 1.8V supply voltage, drawing a maximum current of 21 mA. It features a Standby (Power Down) function for energy management. The component is housed in a compact 4-SMD, No Lead package with dimensions of 2.0 x 1.6 mm.

Feature Summary

• Supports Low Voltage CMOS (LVCMOS) output logic levels
• Includes Standby mode for power down capability
• Utilizes a surface-mount 4-SMD no-lead package

Applications

• Digital clock signal generation
• Microcontroller system timing
• Embedded communication interfaces

Procurement Notes

Verify the specific ordering suffix to ensure the correct package variant and electrical specifications match the design requirements. Confirm that the 1.8V supply voltage aligns with the target circuit's power rails. Check the operating temperature range against environmental conditions. Ensure the 50 ppm frequency stability meets the system's timing accuracy needs before finalizing procurement.

Selection Notes

Select this component when a low-voltage 1.8V operation is required for timing applications. The small 2.0x1.6mm footprint makes it suitable for space-constrained designs. Consider the 21 mA supply current for power budget calculations. The LVCMOS interface ensures compatibility with standard digital logic families. Verify the 50 ppm stability is sufficient for the intended application's synchronization requirements.

Part Context

This part belongs to the 18QHTF21 series of surface-mount oscillators from Mercury Electronics. The series offers various frequencies and voltage options within a standardized 4-SMD package. The 'PD' suffix typically indicates the inclusion of a power-down feature. This model specifically targets applications requiring precise timing at 1.18784 MHz with low power consumption.

Replacement Considerations

Direct substitutes must match the 1.18784 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD package dimensions. Verify equivalent stability and current draw specifications. Cross-reference pinouts and standby functionality to ensure functional compatibility without circuit redesign.