18QHTF21-12.300-PD

Overview

The 18QHTF21-12.300-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 12.3 MHz and utilizes LVCMOS output logic levels. The device is designed for low-power applications, featuring a supply voltage of 1.8V and a standby mode for power-down functionality. It is housed in a compact 4-SMD, no-lead package with dimensions of 2.0 x 1.6 mm. This component serves as a precise clock source for digital circuits requiring stable frequency generation.

Feature Summary

• LVCMOS output interface for digital compatibility
• Integrated standby mode for power management
• Compact 4-SMD no-lead surface mount package

Applications

• Portable electronic devices requiring low power consumption
• Digital signal processing clock sources
• Communication equipment timing references

Procurement Notes

Verify the specific ordering suffix to ensure the correct voltage and package variant matches the design requirements. Confirm that the LVCMOS output level aligns with the target system's input thresholds. Ensure the operating temperature range meets the environmental specifications of the final application. Cross-reference the manufacturer part number with official distributor catalogs to confirm current availability and authenticity before purchase.

Selection Notes

Select this oscillator when a 12.3 MHz reference frequency is required with minimal power usage. The 1.8V supply voltage makes it suitable for battery-operated systems. Consider the small 2.0x1.6 mm footprint for space-constrained PCB layouts. Verify that the LVCMOS output is compatible with the connected microcontroller or FPGA inputs without additional level shifting.

Part Context

This component belongs to the Mercury Electronics XO series, which provides standard frequency control solutions. The brand has a history of manufacturing quartz crystals and oscillators since 1973. The 18QHTF21 series specifically targets low-voltage applications with compact packaging options. These oscillators are designed to replace discrete crystal and load capacitor combinations in modern electronics.

Replacement Considerations

Direct substitutes must match the 12.3 MHz frequency, 1.8V supply, and LVCMOS output. Check pinout compatibility for the 4-SMD no-lead package. Verify that alternative manufacturers offer similar phase noise and stability specifications. Ensure the replacement part supports the same standby functionality if power management is critical.