18QHTF21-49.156915-PD

Overview

The 18QHTF21-49.156915-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 49.156915 MHz and utilizes LVCMOS output logic. The device requires a supply voltage of 1.8V and features a standby or power-down function for energy management. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0mm x 1.6mm. This component is designed for surface-mount applications requiring precise timing signals.

Feature Summary

• Supports standby mode via power-down control
• Utilizes LVCMOS output interface
• Compact 4-SMD no-lead surface mount package

Applications

• General electronic circuit timing
• Digital signal processing systems
• Communication equipment clock sources

Procurement Notes

Verify the specific operating temperature range and load capacitance requirements against your system design before procurement. Confirm that the 1.8V supply voltage aligns with your power architecture. Ensure the 4-SMD footprint matches your PCB layout constraints. Check for any specific handling instructions regarding electrostatic discharge sensitivity during assembly.

Selection Notes

Select this model when a precise 49.156915 MHz reference is required with low voltage operation. Consider the 1.8V supply constraint and LVCMOS compatibility with downstream logic. Evaluate the small 2.0x1.6mm footprint against available board space. Verify that the standard XO stability meets your application's jitter and accuracy needs compared to TCXO alternatives.

Part Context

This part belongs to Mercury Electronics' line of quartz crystal oscillators. The manufacturer specializes in frequency control products including crystals, filters, and oscillators. The '18' prefix typically indicates the 1.8V supply voltage requirement, while 'QHTF' denotes the series type. The '-PD' suffix confirms the inclusion of a power-down feature for standby capability.

Replacement Considerations

Direct replacements must match the 49.156915 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD package. Verify pinout compatibility and electrical characteristics such as current consumption and startup time. Cross-reference with other Mercury Electronics parts or industry-standard equivalents ensuring identical form factor and performance specs.