18QHTF21-8.4672-PD

Overview

The 18QHTF21-8.4672-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 8.4672 MHz and utilizes LVCMOS output logic. The device is designed for low-voltage applications, requiring a 1.8V supply voltage. A key functional characteristic is the inclusion of a standby or power-down mode to manage energy consumption when the oscillator is not actively driving the load. The component is housed in a compact surface-mount package with dimensions of 2.00mm x 1.60mm and a maximum seated height of 0.80mm, suitable for space-constrained electronic designs.

Feature Summary

• Supports LVCMOS output logic for digital interface compatibility
• Features a standby (power down) mode for energy efficiency
• Designed for 1.8V supply voltage operation

Applications

• General-purpose clock signal generation in embedded systems
• Timing reference for low-voltage digital circuits
• Compact consumer electronics requiring small form factor oscillators

Procurement Notes

Verify the specific operating temperature range and load capacitance requirements against the target application's design specifications before procurement. Ensure that the 1.8V supply rail stability meets the oscillator's jitter and noise performance requirements. Confirm that the PCB layout accommodates the 2.00mm x 1.60mm footprint and 0.80mm height constraints. Cross-reference the exact datasheet version to confirm any updates to electrical characteristics or pinout definitions.

Selection Notes

Select this component when a precise 8.4672 MHz timing source is required for 1.8V logic families. Consider the LVCMOS output swing compatibility with downstream inputs. Evaluate the need for power-down functionality versus continuous operation based on system power budgets. Compare physical dimensions against available board space, noting the 2.00mm x 1.60mm SMD package size. Assess thermal management needs if the operating environment approaches extreme temperature limits.

Part Context

This part belongs to the QHTF21 series of surface-mount crystal oscillators from Mercury Electronics. The series typically offers various frequency options within a standardized 2.0x1.6mm package. The 'PD' suffix indicates the inclusion of a power-down control feature. Mercury Electronics is a specialized manufacturer of frequency control products, including quartz crystals and oscillators, with a history dating back to 1973.

Replacement Considerations

Direct substitutes must match the 8.4672 MHz frequency, 1.8V supply, LVCMOS output, and 2.0x1.6mm package. Verify pinout compatibility and electrical parameters such as phase noise and duty cycle. Check if alternative manufacturers offer equivalent parts with similar standby current specifications and operating temperature ranges.