18QHTF21-13.56874-PD

Overview

The 18QHTF21-13.56874-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 13.56874 MHz and utilizes LVCMOS output logic levels. The device is designed for low-voltage applications, requiring a supply voltage of 1.8V. A key functional characteristic is the inclusion of a standby or power-down mode, allowing for energy management when the oscillator is not actively required. The component is housed in a compact 4-SMD, No Lead package, suitable for surface-mount assembly processes.

Feature Summary

• LVCMOS output interface for digital signal compatibility
• Integrated standby and power-down functionality
• Compact 4-SMD no-lead surface mount packaging

Applications

• RFID reader circuits operating at 13.56 MHz
• Low-power embedded system clock sources
• Portable electronic devices requiring standby modes

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 system's power rails. Ensure the LVCMOS output logic is compatible with the receiving digital inputs. Check for any specific handling instructions related to the no-lead SMD package during assembly.

Selection Notes

Select this component when a precise 13.56874 MHz reference is needed for RFID or similar applications. The choice is driven by the requirement for a 1.8V operating voltage and the necessity of a power-down feature to extend battery life. The small 4-SMD footprint makes it suitable for space-constrained designs. Verify that the LVCMOS output swing meets the input threshold requirements of the connected logic.

Part Context

This part belongs to the 18QHTF21 series of crystal oscillators from Mercury Electronics. The series typically offers various frequencies and supply voltages, with the 'PD' suffix indicating the power-down capability. These oscillators are designed for general-purpose timing applications where size and power efficiency are critical factors in the system architecture.

Replacement Considerations

Direct substitutes must match the 13.56874 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD package. Verify pinout compatibility and thermal characteristics. Alternative parts from other manufacturers require careful evaluation of jitter specifications and enable/disable control logic to ensure functional equivalence.