18QHTF21-1.843-PD

Overview

The 18QHTF21-1.843-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronic Ind. Co., Ltd. It operates at a frequency of 1.843 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and features a Standby (Power Down) function to reduce power consumption when not in active use. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0mm x 1.6mm. The component supports an operating temperature range typical for commercial applications, ensuring reliable performance in portable electronics and battery-powered devices requiring precise clock signals.

Feature Summary

• Supports low voltage operation at 1.8V for energy efficiency
• Includes standby mode for power-down capability
• Compact surface-mount package suitable for space-constrained designs

Applications

• Battery-powered portable electronic devices
• Mobile communication equipment
• Consumer electronics requiring precise timing

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your circuit design before procurement. Ensure the 1.8V supply rail stability meets the oscillator's specifications. Confirm that the 4-SMD no-lead package footprint matches your PCB layout guidelines. Check for any RoHS compliance documentation if required by your manufacturing standards. Validate the standby current consumption against your system's power budget constraints.

Selection Notes

Select this component when a low-frequency, low-voltage clock source is required for portable applications. The 1.843 MHz frequency is suitable for baud rate generation or basic system clocks. Consider the 1.8V supply constraint and ensure compatibility with your microcontroller or FPGA I/O levels. The small form factor makes it ideal for dense PCB layouts where space is limited. Evaluate the standby feature benefits for devices with frequent sleep modes.

Part Context

This part belongs to the 18QHTF21 series of surface-mount oscillators from Mercury Electronic. The series offers various frequencies and voltage options, all sharing the same compact 2.0x1.6mm package. Mercury Electronic is a established manufacturer of frequency control products, known for quartz crystal technologies. This specific model provides a stable clock signal for digital circuits requiring low power consumption.

Replacement Considerations

Direct substitutes include other 1.843 MHz LVCMOS oscillators in 4-SMD packages with 1.8V operation. Verify pinout compatibility and electrical parameters such as jitter and phase noise. Alternative models from different manufacturers may require PCB layout adjustments. Ensure the replacement supports the same standby functionality if power management is critical.